sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
5b19d8b2cb
nuttx/arch/xtensa/src/esp32s2/esp32s2_rtc.c
Eren Terzioglu 5b19d8b2cb xtensa/esp32s2: Add RTC support
2023-11-30 21:02:12 -03:00

2692 lines
82 KiB
C
Raw Blame History

/****************************************************************************
* arch/xtensa/src/esp32s2/esp32s2_rtc.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/spinlock.h>
#include "clock/clock.h"
#include "esp32s2_clockconfig.h"
#include "esp32s2_rt_timer.h"
#include "hardware/esp32s2_rtccntl.h"
#include "hardware/esp32s2_rtc_io.h"
#include "hardware/esp32s2_system.h"
#include "hardware/esp32s2_i2s.h"
#include "hardware/esp32s2_rtccntl.h"
#include "hardware/esp32s2_rtc_io.h"
#include "hardware/esp32s2_system.h"
#include "hardware/esp32s2_tim.h"
#include "hardware/regi2c_ctrl.h"
#include "hardware/esp32s2_spi_mem_reg.h"
#include "hardware/esp32s2_extmem.h"
#include "hardware/esp32s2_syscon.h"
#include "hardware/regi2c_bbpll.h"
#include "hardware/regi2c_lp_bias.h"
#include "xtensa.h"
#include "xtensa_attr.h"
#include "esp32s2_rtc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Various delays to be programmed into power control state machines */
#define RTC_CNTL_XTL_BUF_WAIT_SLP 2
#define RTC_CNTL_CK8M_WAIT_SLP 4
#define OTHER_BLOCKS_POWERUP 1
#define OTHER_BLOCKS_WAIT 1
#define ROM_RAM_POWERUP_CYCLES OTHER_BLOCKS_POWERUP
#define ROM_RAM_WAIT_CYCLES OTHER_BLOCKS_WAIT
#define WIFI_POWERUP_CYCLES OTHER_BLOCKS_POWERUP
#define WIFI_WAIT_CYCLES OTHER_BLOCKS_WAIT
#define RTC_POWERUP_CYCLES OTHER_BLOCKS_POWERUP
#define RTC_WAIT_CYCLES OTHER_BLOCKS_WAIT
#define DG_WRAP_POWERUP_CYCLES OTHER_BLOCKS_POWERUP
#define DG_WRAP_WAIT_CYCLES OTHER_BLOCKS_WAIT
#define RTC_MEM_POWERUP_CYCLES OTHER_BLOCKS_POWERUP
#define RTC_MEM_WAIT_CYCLES OTHER_BLOCKS_WAIT
#define RTC_CNTL_PLL_BUF_WAIT_SLP 2
#define DELAY_FAST_CLK_SWITCH 3
#define XTAL_32K_DAC_VAL 1
#define XTAL_32K_DRES_VAL 3
#define XTAL_32K_DBIAS_VAL 0
#define XTAL_32K_EXT_DAC_VAL 2
#define XTAL_32K_EXT_DRES_VAL 3
#define XTAL_32K_EXT_DBIAS_VAL 1
#define DELAY_SLOW_CLK_SWITCH 300
#define DELAY_8M_ENABLE 50
#define RETRY_CAL_EXT 1
/* Lower threshold for a reasonably-looking calibration value
* for a 32KHz XTAL. The ideal value (assuming 32768 Hz frequency)
* is 1000000/32768*(2**19) = 16*10^6.
*/
#define MIN_32K_XTAL_CAL_VAL 15000000L
/* Frequency of the 8M oscillator is 8.5MHz +/- 5%, at the default DCAP
* setting
*/
#define RTC_FAST_CLK_FREQ_8M 8500000
#define RTC_SLOW_CLK_FREQ_90K 90000
#define RTC_SLOW_CLK_FREQ_8MD256 (RTC_FAST_CLK_FREQ_8M / 256)
#define RTC_SLOW_CLK_FREQ_32K 32768
/* Number of fractional bits in values returned by rtc_clk_cal */
#define RTC_CLK_CAL_FRACT 19
/* With the default value of CK8M_DFREQ,
* 8M clock frequency is 8.5 MHz +/- 7%
*/
#define RTC_FAST_CLK_FREQ_APPROX 8500000
#define RCT_FAST_D256_FREQ_APPROX (RTC_FAST_CLK_FREQ_APPROX / 256)
#define RTC_SLOW_CLK_FREQ_APPROX 32768
/* Disable logging from the ROM code. */
#define RTC_DISABLE_ROM_LOG ((1 << 0) | (1 << 16))
#define RTC_SLEEP_PD_DIG BIT(0) /* Deep sleep (power down digital domain) */
#define RTC_SLEEP_PD_RTC_PERIPH BIT(1) /* Power down RTC peripherals */
#define RTC_SLEEP_PD_RTC_SLOW_MEM BIT(2) /* Power down RTC SLOW memory */
#define RTC_SLEEP_PD_RTC_FAST_MEM BIT(3) /* Power down RTC FAST memory */
#define RTC_SLEEP_PD_RTC_MEM_FOLLOW_CPU BIT(4) /* RTC FAST and SLOW memories are automatically powered up and down along with the CPU */
#define RTC_SLEEP_PD_VDDSDIO BIT(5) /* Power down VDDSDIO regulator */
#define RTC_SLEEP_PD_WIFI BIT(6) /* Power down WIFI */
#define RTC_SLEEP_PD_INT_8M BIT(7) /* Power down Internal 8M oscillator */
#define RTC_SLEEP_PD_XTAL BIT(8) /* Power down main XTAL */
/* These flags are not power domains, but will affect some sleep parameters */
#define RTC_SLEEP_DIG_USE_8M BIT(16)
#define RTC_SLEEP_USE_ADC_TESEN_MONITOR BIT(17)
#define RTC_SLEEP_NO_ULTRA_LOW BIT(18) /* Avoid using ultra low power in deep sleep,
* in which RTCIO cannot be used as input,
* and RTCMEM can't work under high temperature */
#define is_dslp(pd_flags) ((pd_flags) & RTC_SLEEP_PD_DIG)
/* set sleep_init default param. */
#define RTC_CNTL_DBG_ATTEN_LIGHTSLEEP_DEFAULT 6
#define RTC_CNTL_DBG_ATTEN_LIGHTSLEEP_NODROP 0
#define RTC_CNTL_DBG_ATTEN_DEEPSLEEP_DEFAULT 15
#define RTC_CNTL_DBG_ATTEN_DEEPSLEEP_NODROP 0
#define RTC_CNTL_BIASSLP_SLEEP_DEFAULT 1
#define RTC_CNTL_BIASSLP_SLEEP_ON 0
#define RTC_CNTL_PD_CUR_SLEEP_DEFAULT 1
#define RTC_CNTL_PD_CUR_SLEEP_ON 0
#define RTC_CNTL_DBG_ATTEN_MONITOR_DEFAULT 0
#define RTC_CNTL_BIASSLP_MONITOR_DEFAULT 1
#define RTC_CNTL_BIASSLP_MONITOR_ON 0
#define RTC_CNTL_PD_CUR_MONITOR_DEFAULT 1
#define RTC_CNTL_PD_CUR_MONITOR_ON 0
/* Approximate mapping of voltages to RTC_CNTL_DBIAS_WAK, RTC_CNTL_DBIAS_SLP,
* RTC_CNTL_DIG_DBIAS_WAK, RTC_CNTL_DIG_DBIAS_SLP values.
* Valid if RTC_CNTL_DBG_ATTEN is 0.
*/
#define RTC_CNTL_DBIAS_0V90 0 /* sleep dig_dbias & rtc_dbias */
#define RTC_CNTL_DBIAS_0V95 1 /* digital voltage */
#define RTC_CNTL_DBIAS_1V00 2
#define RTC_CNTL_DBIAS_1V05 3
#define RTC_CNTL_DBIAS_1V10 4
#define RTC_CNTL_DBIAS_1V15 5
#define RTC_CNTL_DBIAS_1V20 6
#define RTC_CNTL_DBIAS_1V25 7 /* voltage is about 1.34v in fact */
/* Default initializer for esp32s2_rtc_sleep_config_t
* This initializer sets all fields to "reasonable" values
* (e.g. suggested for production use) based on a combination
* of RTC_SLEEP_PD_x flags.
*/
#define RTC_SLEEP_CONFIG_DEFAULT(sleep_flags) { \
.lslp_mem_inf_fpu = 0, \
.rtc_mem_inf_follow_cpu = ((sleep_flags) & \
RTC_SLEEP_PD_RTC_MEM_FOLLOW_CPU) ? 1 : 0, \
.rtc_fastmem_pd_en = ((sleep_flags) & RTC_SLEEP_PD_RTC_FAST_MEM) ? 1 : 0, \
.rtc_slowmem_pd_en = ((sleep_flags) & RTC_SLEEP_PD_RTC_SLOW_MEM) ? 1 : 0, \
.rtc_peri_pd_en = ((sleep_flags) & RTC_SLEEP_PD_RTC_PERIPH) ? 1 : 0, \
.wifi_pd_en = (sleep_flags & RTC_SLEEP_PD_WIFI) ? 1 : 0, \
.int_8m_pd_en = (sleep_flags & RTC_SLEEP_PD_INT_8M) ? 1 : 0, \
.deep_slp = ((sleep_flags) & RTC_SLEEP_PD_DIG) ? 1 : 0, \
.wdt_flashboot_mod_en = 0, \
.dig_dbias_wak = RTC_CNTL_DBIAS_1V10, \
.dig_dbias_slp = is_dslp(sleep_flags) ? RTC_CNTL_DBIAS_SLP \
: !((sleep_flags) & RTC_SLEEP_PD_INT_8M) ? \
RTC_CNTL_DBIAS_1V10 : RTC_CNTL_DBIAS_SLP, \
.rtc_dbias_slp = is_dslp(sleep_flags) ? RTC_CNTL_DBIAS_SLP \
: !((sleep_flags) & RTC_SLEEP_PD_INT_8M) ? \
RTC_CNTL_DBIAS_1V10 : RTC_CNTL_DBIAS_SLP, \
.bias_sleep_monitor = 0, \
.dbg_atten_slp = 0, \
.pd_cur_monitor = 0, \
.pd_cur_slp = 0, \
.rtc_regulator_fpu = 0, \
.rtc_dbias_wak = RTC_CNTL_DBIAS_1V10, \
.vddsdio_pd_en = ((sleep_flags) & RTC_SLEEP_PD_VDDSDIO) ? 1 : 0, \
.xtal_fpu = ((sleep_flags) & RTC_SLEEP_PD_XTAL) ? 0 : 1, \
.deep_slp_reject = 1, \
.light_slp_reject = 1, \
}
#define X32K_CONFIG_DEFAULT() { \
.dac = 3, \
.dres = 3, \
.dgm = 3, \
.dbuf = 1, \
}
/* Initializer for rtc_sleep_pd_config_t which
* sets all flags to the same value
*/
#define RTC_SLEEP_PD_CONFIG_ALL(val) { \
.dig_fpu = (val), \
.rtc_fpu = (val), \
.cpu_fpu = (val), \
.i2s_fpu = (val), \
.bb_fpu = (val), \
.nrx_fpu = (val), \
.fe_fpu = (val), \
}
/* Default initializer of struct esp32s2_rtc_config_s.
* This initializer sets all fields to "reasonable" values
* (e.g. suggested for production use).
*/
#define RTC_CONFIG_DEFAULT() { \
.ck8m_wait = RTC_CNTL_CK8M_WAIT_DEFAULT, \
.xtal_wait = RTC_CNTL_XTL_BUF_WAIT_DEFAULT, \
.pll_wait = RTC_CNTL_PLL_BUF_WAIT_DEFAULT, \
.clkctl_init = 1, \
.pwrctl_init = 1, \
.rtc_dboost_fpd = 1, \
.xtal_fpu = 0, \
.bbpll_fpu = 0, \
.cpu_waiti_clk_gate = 1, \
.cali_ocode = 0 \
}
/* The magic data for the struct esp32s2_rtc_backup_s that is in RTC slow
* memory.
*/
#define MAGIC_RTC_SAVE UINT64_C(0x11223344556677)
/* RTC Memory & Store Register usage */
#define RTC_SLOW_CLK_CAL_REG RTC_CNTL_STORE1_REG /* RTC_SLOW_CLK calibration value */
#define RTC_BOOT_TIME_LOW_REG RTC_CNTL_STORE2_REG /* Boot time, low word */
#define RTC_BOOT_TIME_HIGH_REG RTC_CNTL_STORE3_REG /* Boot time, high word */
#define RTC_XTAL_FREQ_REG RTC_CNTL_STORE4_REG /* External XTAL frequency */
#define RTC_APB_FREQ_REG RTC_CNTL_STORE5_REG /* APB bus frequency */
#define RTC_ENTRY_ADDR_REG RTC_CNTL_STORE6_REG /* FAST_RTC_MEMORY_ENTRY */
#define RTC_RESET_CAUSE_REG RTC_CNTL_STORE6_REG
#define RTC_MEMORY_CRC_REG RTC_CNTL_STORE7_REG /* FAST_RTC_MEMORY_CRC */
/****************************************************************************
* Private Types
****************************************************************************/
/* RTC power and clock control initialization settings */
struct esp32s2_rtc_priv_s
{
uint32_t ck8m_wait : 8; /* Number of rtc_fast_clk cycles to wait for 8M clock to be ready */
uint32_t xtal_wait : 8; /* Number of rtc_fast_clk cycles to wait for XTAL clock to be ready */
uint32_t pll_wait : 8; /* Number of rtc_fast_clk cycles to wait for PLL to be ready */
uint32_t clkctl_init : 1; /* Perform clock control related initialization */
uint32_t pwrctl_init : 1; /* Perform power control related initialization */
uint32_t rtc_dboost_fpd : 1; /* Force power down RTC_DBOOST */
uint32_t xtal_fpu : 1;
uint32_t bbpll_fpu : 1;
uint32_t cpu_waiti_clk_gate : 1;
uint32_t cali_ocode : 1; /* Calibrate Ocode to make bangap voltage more precise. */
};
/* sleep configuration for rtc_sleep_init function */
struct esp32s2_rtc_sleep_config_s
{
uint32_t lslp_mem_inf_fpu : 1; /* force normal voltage in sleep mode (digital domain memory) */
uint32_t rtc_mem_inf_follow_cpu : 1; /* keep low voltage in sleep mode (even if ULP/touch is used) */
uint32_t rtc_fastmem_pd_en : 1; /* power down RTC fast memory */
uint32_t rtc_slowmem_pd_en : 1; /* power down RTC slow memory */
uint32_t rtc_peri_pd_en : 1; /* power down RTC peripherals */
uint32_t wifi_pd_en : 1; /* power down WiFi */
uint32_t int_8m_pd_en : 1; /* Power down Internal 8M oscillator */
uint32_t deep_slp : 1; /* power down digital domain */
uint32_t wdt_flashboot_mod_en : 1; /* enable WDT flashboot mode */
uint32_t dig_dbias_wak : 3; /* set bias for digital domain, in active mode */
uint32_t dig_dbias_slp : 3; /* set bias for digital domain, in sleep mode */
uint32_t rtc_dbias_wak : 3; /* set bias for RTC domain, in active mode */
uint32_t rtc_dbias_slp : 3; /* set bias for RTC domain, in sleep mode */
uint32_t bias_sleep_monitor : 1; /* circuit control parameter, in monitor mode */
uint32_t dbg_atten_slp : 4; /* voltage parameter, in sleep mode */
uint32_t bias_sleep_slp : 1; /* circuit control parameter, in sleep mode */
uint32_t pd_cur_monitor : 1; /* circuit control parameter, in monitor mode */
uint32_t pd_cur_slp : 1; /* circuit control parameter, in sleep mode */
uint32_t vddsdio_pd_en : 1; /* power down VDDSDIO regulator */
uint32_t xtal_fpu : 1; /* keep main XTAL powered up in sleep */
uint32_t rtc_regulator_fpu : 1; /* keep rtc regulator powered up in sleep */
uint32_t deep_slp_reject : 1; /* enable deep sleep reject */
uint32_t light_slp_reject : 1; /* enable light sleep reject */
};
/* Power down flags for rtc_sleep_pd function */
struct esp32s2_rtc_sleep_pd_config_s
{
uint32_t dig_fpu : 1; /* Set to 1 to power down digital part in sleep */
uint32_t rtc_fpu : 1; /* Set to 1 to power down RTC memories in sleep */
uint32_t cpu_fpu : 1; /* Set to 1 to power down digital memories and CPU in sleep */
uint32_t i2s_fpu : 1; /* Set to 1 to power down I2S in sleep */
uint32_t bb_fpu : 1; /* Set to 1 to power down Wi-Fi in sleep */
uint32_t nrx_fpu : 1; /* Set to 1 to power down Wi-Fi in sleep */
uint32_t fe_fpu : 1; /* Set to 1 to power down Wi-Fi in sleep */
};
#ifdef CONFIG_RTC_ALARM
struct alm_cbinfo_s
{
struct rt_timer_s *alarm_hdl; /* Timer id point to here */
volatile alm_callback_t ac_cb; /* Client callback function */
volatile void *ac_arg; /* Argument to pass with the callback function */
uint64_t deadline_us;
uint8_t index;
};
#endif
/* crystal configuration */
struct esp32s2_rtc_x32k_config_s
{
uint32_t dac : 6;
uint32_t dres : 3;
uint32_t dgm : 3;
uint32_t dbuf: 1;
};
struct esp32s2_rtc_backup_s
{
uint64_t magic;
int64_t offset; /* Offset time from RTC HW value */
int64_t reserved0;
};
/****************************************************************************
* Private Data
****************************************************************************/
/* APB Frequency */
static uint32_t g_apb_freq;
/* Callback to use when the alarm expires */
#ifdef CONFIG_RTC_ALARM
static struct alm_cbinfo_s g_alarmcb[RTC_ALARM_LAST];
#endif
static RTC_DATA_ATTR struct esp32s2_rtc_backup_s rtc_saved_data;
/* Saved data for persistent RTC time */
static struct esp32s2_rtc_backup_s *g_rtc_save;
static bool g_rt_timer_enabled = false;
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_sleep_pd(
struct esp32s2_rtc_sleep_pd_config_s cfg);
static inline bool esp32s2_clk_val_is_valid(uint32_t val);
static void IRAM_ATTR esp32s2_rtc_clk_fast_freq_set(
enum esp32s2_rtc_fast_freq_e fast_freq);
static uint32_t IRAM_ATTR esp32s2_rtc_clk_cal_internal(
enum esp32s2_rtc_cal_sel_e cal_clk,
uint32_t slowclk_cycles);
static int IRAM_ATTR esp32s2_rtc_clk_slow_freq_get(void);
static void IRAM_ATTR esp32s2_rtc_clk_slow_freq_set(
enum esp32s2_rtc_slow_freq_e slow_freq);
static void esp32s2_select_rtc_slow_clk(enum esp32s2_slow_clk_sel_e
slow_clk);
static void esp32s2_rtc_clk_32k_enable(bool enable);
static void IRAM_ATTR esp32s2_rtc_clk_8m_enable(bool clk_8m_en,
bool d256_en);
static void esp32s2_rtc_calibrate_ocode(void);
static void IRAM_ATTR esp32s2_rtc_clk_bbpll_disable(void);
static void IRAM_ATTR esp32s2_rtc_bbpll_configure(
enum esp32s2_rtc_xtal_freq_e xtal_freq, int pll_freq);
static void IRAM_ATTR esp32s2_rtc_clk_cpu_freq_to_8m(void);
static void IRAM_ATTR esp32s2_rtc_clk_cpu_freq_to_pll_mhz(int cpu_freq_mhz);
void IRAM_ATTR esp32s2_rtc_bbpll_disable(void);
void esp32s2_rtc_clk_apb_freq_update(uint32_t apb_freq);
void IRAM_ATTR esp32s2_rtc_update_to_xtal(int freq, int div);
static void esp32s2_wait_dig_dbias_valid(uint64_t rtc_cycles);
uint32_t esp32s2_rtc_clk_apb_freq_get(void);
#ifdef CONFIG_RTC_ALARM
static void IRAM_ATTR esp32s2_rt_cb_handler(void *arg);
#endif
/****************************************************************************
* Public Data
****************************************************************************/
volatile bool g_rtc_enabled = false;
/****************************************************************************
* Private Functions
****************************************************************************/
/* Set the real CPU ticks per us to the ets, so that ets_delay_us
* will be accurate. Call this function when CPU frequency is changed.
*/
extern void ets_update_cpu_frequency(uint32_t ticks_per_us);
/****************************************************************************
* Name: esp32s2_rtc_sleep_pd
*
* Description:
* Configure whether certain peripherals are powered up in deep sleep.
*
* Input Parameters:
* cfg - power down flags as rtc_sleep_pu_config_t structure
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR
esp32s2_rtc_sleep_pd(struct esp32s2_rtc_sleep_pd_config_s cfg)
{
REG_SET_FIELD(RTC_CNTL_DIG_PWC_REG,
RTC_CNTL_LSLP_MEM_FORCE_PU, cfg.dig_fpu);
REG_SET_FIELD(RTC_CNTL_PWC_REG,
RTC_CNTL_FASTMEM_FORCE_LPU, cfg.rtc_fpu);
REG_SET_FIELD(RTC_CNTL_PWC_REG,
RTC_CNTL_SLOWMEM_FORCE_LPU, cfg.rtc_fpu);
REG_SET_FIELD(SYSCON_FRONT_END_MEM_PD_REG,
SYSCON_DC_MEM_FORCE_PU, cfg.fe_fpu);
REG_SET_FIELD(SYSCON_FRONT_END_MEM_PD_REG,
SYSCON_PBUS_MEM_FORCE_PU, cfg.fe_fpu);
REG_SET_FIELD(SYSCON_FRONT_END_MEM_PD_REG,
SYSCON_AGC_MEM_FORCE_PU, cfg.fe_fpu);
REG_SET_FIELD(BBPD_CTRL, BB_FFT_FORCE_PU, cfg.bb_fpu);
REG_SET_FIELD(BBPD_CTRL, BB_DC_EST_FORCE_PU, cfg.bb_fpu);
REG_SET_FIELD(NRXPD_CTRL, NRX_RX_ROT_FORCE_PU, cfg.nrx_fpu);
REG_SET_FIELD(NRXPD_CTRL, NRX_VIT_FORCE_PU, cfg.nrx_fpu);
REG_SET_FIELD(NRXPD_CTRL, NRX_DEMAP_FORCE_PU, cfg.nrx_fpu);
REG_SET_FIELD(FE_GEN_CTRL, FE_IQ_EST_FORCE_PU, cfg.fe_fpu);
REG_SET_FIELD(FE2_TX_INTERP_CTRL, FE2_TX_INF_FORCE_PU, cfg.fe_fpu);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_fast_freq_set
*
* Description:
* Select source for RTC_FAST_CLK.
*
* Input Parameters:
* fast_freq - Clock source (one of enum esp32s2_rtc_fast_freq_e values)
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_fast_freq_set(
enum esp32s2_rtc_fast_freq_e fast_freq)
{
REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_FAST_CLK_RTC_SEL,
fast_freq);
up_udelay(DELAY_FAST_CLK_SWITCH);
}
/****************************************************************************
* Name: esp32s2_clk_val_is_valid
*
* Description:
* Values of RTC_XTAL_FREQ_REG and RTC_APB_FREQ_REG are
* stored as two copies in lower and upper 16-bit halves.
* These are the routines to work with such a representation.
*
* Input Parameters:
* val - register value
*
* Returned Value:
* true: Valid register value.
* false: Invalid register value.
*
****************************************************************************/
static inline bool esp32s2_clk_val_is_valid(uint32_t val)
{
return (val & 0xffff) == ((val >> 16) & 0xffff)
&& val != 0 && val != UINT32_MAX;
}
/****************************************************************************
* Name: esp32s2_rtc_clk_cal_internal
*
* Description:
* Clock calibration function used by rtc_clk_cal and rtc_clk_cal_ratio
*
* Input Parameters:
* cal_clk - which clock to calibrate
* slowclk_cycles - number of slow clock cycles to count.
*
* Returned Value:
* Number of XTAL clock cycles within the given number of slow clock
* cycles.
* In case of error, return 0 cycle.
*
****************************************************************************/
static uint32_t IRAM_ATTR esp32s2_rtc_clk_cal_internal(
enum esp32s2_rtc_cal_sel_e cal_clk, uint32_t slowclk_cycles)
{
uint32_t expected_freq;
uint32_t us_time_estimate;
uint32_t clks_state;
uint32_t clks_mask;
uint32_t cal_val;
enum esp32s2_rtc_slow_freq_e slow_freq;
/* Get the current state */
clks_mask = (RTC_CNTL_DIG_XTAL32K_EN_M | RTC_CNTL_DIG_CLK8M_D256_EN_M);
clks_state = getreg32(RTC_CNTL_CLK_CONF_REG);
clks_state &= clks_mask;
/* On ESP32S2, choosing RTC_CAL_RTC_MUX results in calibration of
* the 150k RTC clock regardless of the currenlty selected SLOW_CLK.
* The following code emulates ESP32 behavior
*/
if (cal_clk == RTC_CAL_RTC_MUX)
{
slow_freq = esp32s2_rtc_clk_slow_freq_get();
if (slow_freq == RTC_SLOW_FREQ_32K_XTAL)
{
cal_clk = RTC_CAL_32K_XTAL;
}
else if (slow_freq == RTC_SLOW_FREQ_8MD256)
{
cal_clk = RTC_CAL_8MD256;
}
}
else if (cal_clk == RTC_CAL_INTERNAL_OSC)
{
cal_clk = RTC_CAL_RTC_MUX;
}
/* Enable requested clock (150k clock is always on) */
if (cal_clk == RTC_CAL_32K_XTAL && !(clks_state & RTC_CNTL_DIG_XTAL32K_EN))
{
REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_DIG_XTAL32K_EN, 1);
}
else if (cal_clk == RTC_CAL_8MD256 &&
!(clks_state & RTC_CNTL_DIG_CLK8M_D256_EN))
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, 0, RTC_CNTL_DIG_CLK8M_D256_EN);
}
/* Prepare calibration */
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_CLK_SEL, cal_clk);
modifyreg32(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START_CYCLING, 0);
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_MAX, slowclk_cycles);
/* Figure out how long to wait for calibration to finish */
slow_freq = REG_GET_FIELD(RTC_CNTL_CLK_CONF_REG,
RTC_CNTL_ANA_CLK_RTC_SEL);
if (cal_clk == RTC_CAL_32K_XTAL || slow_freq == RTC_SLOW_FREQ_32K_XTAL)
{
expected_freq = 32768; /* standard 32KHz XTAL */
}
else if (cal_clk == RTC_CAL_8MD256 || slow_freq == RTC_SLOW_FREQ_8MD256)
{
expected_freq = RTC_FAST_CLK_FREQ_APPROX / 256;
}
else
{
expected_freq = 150000; /* 150k internal oscillator */
}
us_time_estimate = (uint32_t) (((uint64_t)slowclk_cycles) *
MHZ / expected_freq);
/* Start calibration */
modifyreg32(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START, 0);
modifyreg32(TIMG_RTCCALICFG_REG(0), 0, TIMG_RTC_CALI_START);
/* Wait the expected time calibration should take */
up_udelay(us_time_estimate);
/* Wait for calibration to finish up to another us_time_estimate */
while (true)
{
if (getreg32(TIMG_RTCCALICFG_REG(0)) & TIMG_RTC_CALI_RDY)
{
cal_val = REG_GET_FIELD(TIMG_RTCCALICFG1_REG(0),
TIMG_RTC_CALI_VALUE);
break;
}
if (GET_PERI_REG_MASK(TIMG_RTCCALICFG2_REG(0), TIMG_RTC_CALI_TIMEOUT))
{
cal_val = 0;
break;
}
}
CLEAR_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START);
/* Restore the previous clocks states */
modifyreg32(RTC_CNTL_CLK_CONF_REG, clks_mask, clks_state);
return cal_val;
}
static void esp32s2_wait_dig_dbias_valid(uint64_t rtc_cycles)
{
int slow_clk_freq = esp32s2_rtc_clk_slow_freq_get();
int cal_clk = RTC_CAL_RTC_MUX;
if (slow_clk_freq == RTC_SLOW_FREQ_32K_XTAL)
{
cal_clk = RTC_CAL_32K_XTAL;
}
else if (slow_clk_freq == RTC_SLOW_FREQ_8MD256)
{
cal_clk = RTC_CAL_8MD256;
}
esp32s2_rtc_clk_cal(cal_clk, rtc_cycles);
}
/****************************************************************************
* Name: esp32s2_rtc_update_to_xtal
*
* Description:
* Switch to XTAL frequency, does not disable the PLL
*
* Input Parameters:
* freq - XTAL frequency
* div - REF_TICK divider
*
* Returned Value:
* none
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_update_to_xtal(int freq, int div)
{
ets_update_cpu_frequency(freq);
esp32s2_wait_dig_dbias_valid(2);
/* Set divider from XTAL to APB clock.
* Need to set divider to 1 (reg. value 0) first.
*/
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_PRE_DIV_CNT, 0);
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_PRE_DIV_CNT, div - 1);
/* No need to adjust the REF_TICK.
* Switch clock source.
*/
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_SOC_CLK_SEL, DPORT_SOC_CLK_SEL_XTAL);
esp32s2_rtc_clk_apb_freq_update(freq * MHZ);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_slow_freq_set
*
* Description:
* Select source for RTC_SLOW_CLK
*
* Input Parameters:
* slow_freq - Select source for RTC_SLOW_CLK
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_slow_freq_set(
enum esp32s2_rtc_slow_freq_e slow_freq)
{
REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_ANA_CLK_RTC_SEL,
slow_freq);
REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_DIG_XTAL32K_EN,
(slow_freq == RTC_SLOW_FREQ_32K_XTAL) ? 1 : 0);
up_udelay(DELAY_SLOW_CLK_SWITCH);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_32k_enable
*
* Description:
* Enable 32 KHz XTAL oscillator
*
* Input Parameters:
* enable - boolean Enable/Disable
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_32k_enable(bool enable)
{
if (enable)
{
struct esp32s2_rtc_x32k_config_s cfg = X32K_CONFIG_DEFAULT();
modifyreg32(RTCIO_XTAL_32P_PAD_REG, 0, RTCIO_X32P_MUX_SEL);
modifyreg32(RTCIO_XTAL_32N_PAD_REG, 0, RTCIO_X32N_MUX_SEL);
REG_SET_FIELD(RTC_CNTL_EXT_XTL_CONF_REG,
RTC_CNTL_DAC_XTAL_32K, cfg.dac);
REG_SET_FIELD(RTC_CNTL_EXT_XTL_CONF_REG,
RTC_CNTL_DRES_XTAL_32K, cfg.dres);
REG_SET_FIELD(RTC_CNTL_EXT_XTL_CONF_REG,
RTC_CNTL_DGM_XTAL_32K, cfg.dgm);
REG_SET_FIELD(RTC_CNTL_EXT_XTL_CONF_REG,
RTC_CNTL_DBUF_XTAL_32K, cfg.dbuf);
modifyreg32(RTC_CNTL_EXT_XTL_CONF_REG, 0,
RTC_CNTL_XPD_XTAL_32K);
}
else
{
modifyreg32(RTC_CNTL_EXT_XTL_CONF_REG, RTC_CNTL_XPD_XTAL_32K,
RTC_CNTL_XTAL32K_XPD_FORCE);
}
}
/****************************************************************************
* Name: esp32s2_rtc_clk_8m_enable
*
* Description:
* Enable or disable 8 MHz internal oscillator
*
* Input Parameters:
* clk_8m_en - true to enable 8MHz generator, false to disable
* d256_en - true to enable /256 divider, false to disable
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_8m_enable(bool clk_8m_en, bool d256_en)
{
if (clk_8m_en)
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_ENB_CK8M, 0);
/* no need to wait once enabled by software */
REG_SET_FIELD(RTC_CNTL_TIMER1_REG, RTC_CNTL_CK8M_WAIT, 1);
if (d256_en)
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_ENB_CK8M_DIV, 0);
}
else
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, 0, RTC_CNTL_ENB_CK8M_DIV);
}
up_udelay(DELAY_8M_ENABLE);
}
else
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, 0, RTC_CNTL_ENB_CK8M);
REG_SET_FIELD(RTC_CNTL_TIMER1_REG, RTC_CNTL_CK8M_WAIT,
RTC_CNTL_CK8M_WAIT_DEFAULT);
}
}
/****************************************************************************
* Name: esp32s2_select_rtc_slow_clk
*
* Description:
* Selects an clock source for RTC.
*
* Input Parameters:
* slow_clk - RTC SLOW_CLK frequency values
*
* Returned Value:
* None
*
****************************************************************************/
static void esp32s2_select_rtc_slow_clk(enum esp32s2_slow_clk_sel_e slow_clk)
{
/* Number of times to repeat 32KHz XTAL calibration before giving up and
* switching to the internal RC.
*/
int retry_32k_xtal = 0;
uint32_t cal_val = 0;
uint64_t cal_dividend;
enum esp32s2_rtc_slow_freq_e rtc_slow_freq = slow_clk &
RTC_CNTL_ANA_CLK_RTC_SEL_V;
do
{
if (rtc_slow_freq == RTC_SLOW_FREQ_32K_XTAL)
{
/* 32KHz XTAL oscillator needs to be enabled and running before
* it can be used. Hardware doesn't have a direct way of checking
* if the oscillator is running. Here we use rtc_clk_cal function
* to count the number of main XTAL cycles in the given number of
* 32KHz XTAL oscillator cycles. If the 32KHz XTAL has not
* started up, calibration will time out, returning 0.
*/
rtcinfo("Waiting for 32KHz oscillator to start up\n");
if (slow_clk == SLOW_CLK_32K_XTAL ||
slow_clk == SLOW_CLK_32K_EXT_OSC)
{
esp32s2_rtc_clk_32k_enable(true);
}
if (SLOW_CLK_CAL_CYCLES > 0)
{
cal_val = esp32s2_rtc_clk_cal(RTC_CAL_32K_XTAL,
SLOW_CLK_CAL_CYCLES);
if (cal_val == 0 || cal_val < MIN_32K_XTAL_CAL_VAL)
{
if (retry_32k_xtal-- > 0)
{
continue;
}
rtc_slow_freq = RTC_SLOW_FREQ_RTC;
}
}
}
else if (rtc_slow_freq == RTC_SLOW_FREQ_8MD256)
{
esp32s2_rtc_clk_8m_enable(true, true);
}
esp32s2_rtc_clk_slow_freq_set(rtc_slow_freq);
if (SLOW_CLK_CAL_CYCLES > 0)
{
/* 32KHz XTAL oscillator has some frequency drift at startup.
* Improve calibration routine to wait until
* the frequency is stable.
*/
cal_val = esp32s2_rtc_clk_cal(RTC_CAL_RTC_MUX,
SLOW_CLK_CAL_CYCLES);
}
else
{
cal_dividend = (1ULL << RTC_CLK_CAL_FRACT) * 1000000ULL;
cal_val = (uint32_t)(cal_dividend /
esp32s2_rtc_clk_slow_freq_get_hz());
}
retry_32k_xtal++;
}
while (cal_val == 0 && retry_32k_xtal < RETRY_CAL_EXT);
rtcinfo("RTC_SLOW_CLK calibration value: %d\n", cal_val);
putreg32((uint32_t)cal_val, RTC_SLOW_CLK_CAL_REG);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_cpu_freq_to_8m
*
* Description:
* Switch CPU frequency to 8 Mhz.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_cpu_freq_to_8m(void)
{
int origin_soc_clk = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_SOC_CLK_SEL);
int origin_div_cnt = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_PRE_DIV_CNT);
ets_update_cpu_frequency(8);
REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_DIG_DBIAS_WAK, DIG_DBIAS_XTAL);
esp32s2_wait_dig_dbias_valid(2);
if ((DPORT_SOC_CLK_SEL_XTAL == origin_soc_clk)
&& (origin_div_cnt > 4))
{
esp32s2_wait_dig_dbias_valid(2);
}
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_PRE_DIV_CNT, 0);
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_SOC_CLK_SEL,
DPORT_SOC_CLK_SEL_8M);
esp32s2_rtc_clk_apb_freq_update(RTC_FAST_CLK_FREQ_APPROX);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_cpu_freq_to_pll_mhz
*
* Description:
* Switch to one of PLL-based frequencies.
*
* Input Parameters:
* cpu_freq_mhz - CPU frequency
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_cpu_freq_to_pll_mhz(int cpu_freq_mhz)
{
int origin_soc_clk = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_SOC_CLK_SEL);
int origin_cpuperiod_sel = REG_GET_FIELD(SYSTEM_CPU_PER_CONF_REG,
SYSTEM_CPUPERIOD_SEL);
int dbias = DIG_DBIAS_80M_160M;
int per_conf = DPORT_CPUPERIOD_SEL_80;
if (cpu_freq_mhz == 80)
{
/* Nothing to do */
}
else if (cpu_freq_mhz == 160)
{
dbias = DIG_DBIAS_80M_160M;
per_conf = DPORT_CPUPERIOD_SEL_160;
}
else if (cpu_freq_mhz == 240)
{
dbias = DIG_DBIAS_240M;
per_conf = DPORT_CPUPERIOD_SEL_240;
}
else
{
rtcerr("Invalid frequency\n");
}
REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_DIG_DBIAS_WAK, dbias);
REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_DBIAS_WAK, dbias);
if ((origin_soc_clk == DPORT_SOC_CLK_SEL_XTAL)
|| (origin_soc_clk == DPORT_SOC_CLK_SEL_8M)
|| (((origin_soc_clk == DPORT_SOC_CLK_SEL_PLL)
&& (0 == origin_cpuperiod_sel))))
{
esp32s2_wait_dig_dbias_valid(2);
}
REG_SET_FIELD(SYSTEM_CPU_PER_CONF_REG, SYSTEM_CPUPERIOD_SEL, per_conf);
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_PRE_DIV_CNT, 0);
REG_SET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_SOC_CLK_SEL,
DPORT_SOC_CLK_SEL_PLL);
esp32s2_rtc_clk_apb_freq_update(80 * MHZ);
ets_update_cpu_frequency(cpu_freq_mhz);
}
#ifdef CONFIG_RTC_ALARM
/****************************************************************************
* Name: esp32s2_rt_cb_handler
*
* Description:
* RT-Timer service routine
*
* Input Parameters:
* arg - Information about the RT-Timer configuration.
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rt_cb_handler(void *arg)
{
struct alm_cbinfo_s *cbinfo = (struct alm_cbinfo_s *)arg;
alm_callback_t cb;
void *cb_arg;
int alminfo_id;
DEBUGASSERT(cbinfo != NULL);
alminfo_id = cbinfo->index;
DEBUGASSERT((RTC_ALARM0 <= alminfo_id) &&
(alminfo_id < RTC_ALARM_LAST));
if (cbinfo->ac_cb != NULL)
{
/* Alarm callback */
cb = cbinfo->ac_cb;
cb_arg = (void *)cbinfo->ac_arg;
cbinfo->ac_cb = NULL;
cbinfo->ac_arg = NULL;
cbinfo->deadline_us = 0;
cb(cb_arg, alminfo_id);
}
}
#endif /* CONFIG_RTC_ALARM */
/****************************************************************************
* Name: esp32s2_rtc_calibrate_ocode
*
* Description:
* Calibrate o-code by software
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
static void esp32s2_rtc_calibrate_ocode(void)
{
uint64_t cycle0;
uint64_t timeout_cycle;
uint32_t slow_clk_period;
uint64_t max_delay_cycle;
bool odone_flag = 0;
bool bg_odone_flag = 0;
uint64_t cycle1 = 0;
uint64_t max_delay_time_us = 10000;
struct esp32s2_cpu_freq_config_s freq_config;
/* Bandgap output voltage is not precise when calibrate o-code by hardware
* sometimes, so need software o-code calibration (must turn off PLL).
* Method:
* 1. read current cpu config, save in old_config
* 2. switch cpu to xtal because PLL will be closed when o-code calibration
* 3. begin o-code calibration
* 4. wait o-code calibration done flag or timeout
* 5. set cpu to old-config
*/
enum esp32s2_rtc_slow_freq_e slow_clk_freq =
esp32s2_rtc_clk_slow_freq_get();
enum esp32s2_rtc_slow_freq_e rtc_slow_freq_x32k =
RTC_SLOW_FREQ_32K_XTAL;
enum esp32s2_rtc_slow_freq_e rtc_slow_freq_8md256 =
RTC_SLOW_FREQ_8MD256;
enum esp32s2_rtc_cal_sel_e cal_clk = RTC_CAL_RTC_MUX;
if (slow_clk_freq == rtc_slow_freq_x32k)
{
cal_clk = RTC_CAL_32K_XTAL;
}
else if (slow_clk_freq == rtc_slow_freq_8md256)
{
cal_clk = RTC_CAL_8MD256;
}
slow_clk_period = esp32s2_rtc_clk_cal(cal_clk, 100);
max_delay_cycle = esp32s2_rtc_time_us_to_slowclk(max_delay_time_us,
slow_clk_period);
cycle0 = esp32s2_rtc_time_get();
timeout_cycle = cycle0 + max_delay_cycle;
esp32s2_rtc_clk_cpu_freq_get_config(&freq_config);
esp32s2_rtc_cpu_freq_set_xtal();
REGI2C_WRITE_MASK(I2C_ULP, I2C_ULP_IR_RESETB, 0);
REGI2C_WRITE_MASK(I2C_ULP, I2C_ULP_IR_RESETB, 1);
while (1)
{
odone_flag = REGI2C_READ_MASK(I2C_ULP, I2C_ULP_O_DONE_FLAG);
bg_odone_flag = REGI2C_READ_MASK(I2C_ULP, I2C_ULP_BG_O_DONE_FLAG);
cycle1 = esp32s2_rtc_time_get();
if (odone_flag && bg_odone_flag)
{
break;
}
if (cycle1 >= timeout_cycle)
{
break;
}
}
esp32s2_rtc_clk_cpu_freq_set_config(&freq_config);
}
/****************************************************************************
* Public Functions
****************************************************************************/
static int IRAM_ATTR esp32s2_rtc_clk_slow_freq_get(void)
{
return REG_GET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_ANA_CLK_RTC_SEL);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_slow_freq_get_hz
*
* Description:
* Get the approximate frequency of RTC_SLOW_CLK, in Hz
*
* Input Parameters:
* None
*
* Returned Value:
* RTC_SLOW_CLK frequency, in Hz
*
****************************************************************************/
uint32_t IRAM_ATTR esp32s2_rtc_clk_slow_freq_get_hz(void)
{
enum esp32s2_rtc_slow_freq_e slow_clk_freq =
REG_GET_FIELD(RTC_CNTL_CLK_CONF_REG,
RTC_CNTL_ANA_CLK_RTC_SEL);
switch (slow_clk_freq)
{
case RTC_SLOW_FREQ_RTC:
return RTC_SLOW_CLK_FREQ_APPROX;
case RTC_SLOW_FREQ_32K_XTAL:
return RTC_SLOW_CLK_FREQ_APPROX;
case RTC_SLOW_FREQ_8MD256:
return RCT_FAST_D256_FREQ_APPROX;
}
return OK;
}
/****************************************************************************
* Name: esp32s2_rtc_clk_fast_freq_get_hz
*
* Description:
* Get fast_clk_rtc source in Hz.
*
* Input Parameters:
* None
*
* Returned Value:
* The clock source in Hz.
*
****************************************************************************/
uint32_t IRAM_ATTR esp32s2_rtc_clk_fast_freq_get_hz(void)
{
return RTC_FAST_CLK_FREQ_APPROX;
}
/****************************************************************************
* Name: esp32s2_rtc_get_slow_clk_rtc
*
* Description:
* Get slow_clk_rtc source.
*
* Input Parameters:
* None
*
* Returned Value:
* The clock source:
* - SLOW_CK
* - CK_XTAL_32K
* - CK8M_D256_OUT
*
****************************************************************************/
enum esp32s2_rtc_slow_freq_e IRAM_ATTR esp32s2_rtc_get_slow_clk(void)
{
enum esp32s2_rtc_slow_freq_e slow_freq;
/* Get the clock source for slow_clk_rtc */
slow_freq = REG_GET_FIELD(RTC_CNTL_CLK_CONF_REG,
RTC_CNTL_ANA_CLK_RTC_SEL);
return slow_freq;
}
/****************************************************************************
* Name: esp32s2_rtc_clk_cal
*
* Description:
* Measure RTC slow clock's period, based on main XTAL frequency
*
* Input Parameters:
* cal_clk - clock to be measured
* slowclk_cycles - number of slow clock cycles to average
*
* Returned Value:
* Average slow clock period in microseconds, Q13.19 fixed point format
* or 0 if calibration has timed out
*
****************************************************************************/
uint32_t IRAM_ATTR esp32s2_rtc_clk_cal(enum esp32s2_rtc_cal_sel_e cal_clk,
uint32_t slowclk_cycles)
{
enum esp32s2_rtc_xtal_freq_e xtal_freq;
uint64_t xtal_cycles;
uint64_t divider;
uint64_t period_64;
uint32_t period;
xtal_freq = esp32s2_rtc_clk_xtal_freq_get();
xtal_cycles = esp32s2_rtc_clk_cal_internal(cal_clk, slowclk_cycles);
divider = ((uint64_t)xtal_freq) * slowclk_cycles;
period_64 = ((xtal_cycles << RTC_CLK_CAL_FRACT) + divider / 2 - 1)
/ divider;
period = (uint32_t)(period_64 & UINT32_MAX);
return period;
}
enum esp32s2_rtc_xtal_freq_e rtc_get_xtal(void)
__attribute__((alias("esp32s2_rtc_clk_xtal_freq_get")));
/****************************************************************************
* Name: esp32s2_rtc_clk_xtal_freq_get
*
* Description:
* Get main XTAL frequency
*
* Input Parameters:
* None
*
* Returned Value:
* XTAL frequency (one of enum esp32s2_rtc_xtal_freq_e values)
*
****************************************************************************/
enum esp32s2_rtc_xtal_freq_e IRAM_ATTR esp32s2_rtc_clk_xtal_freq_get(void)
{
/* We may have already written XTAL value into RTC_XTAL_FREQ_REG */
uint32_t xtal_freq_reg = getreg32(RTC_XTAL_FREQ_REG);
if (!esp32s2_clk_val_is_valid(xtal_freq_reg))
{
return RTC_XTAL_FREQ_40M;
}
return (xtal_freq_reg & ~RTC_DISABLE_ROM_LOG) & UINT16_MAX;
}
/****************************************************************************
* Name: esp32s2_rtc_clk_bbpll_disable
*
* Description:
* disable BBPLL.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_clk_bbpll_disable(void)
{
modifyreg32(RTC_CNTL_OPTIONS0_REG, 0, RTC_CNTL_BB_I2C_FORCE_PD |
RTC_CNTL_BBPLL_FORCE_PD | RTC_CNTL_BBPLL_I2C_FORCE_PD);
}
/****************************************************************************
* Name: esp32s2_rtc_bbpll_configure
*
* Description:
* Configure main XTAL frequency values according to pll_freq.
*
* Input Parameters:
* xtal_freq - XTAL frequency values
* pll_freq - PLL frequency values
*
* Returned Value:
* None
*
****************************************************************************/
static void IRAM_ATTR esp32s2_rtc_bbpll_configure(
enum esp32s2_rtc_xtal_freq_e xtal_freq, int pll_freq)
{
static uint8_t div_ref = 0;
static uint8_t div7_0 = 0;
static uint8_t dr1 = 0 ;
static uint8_t dr3 = 0 ;
static uint8_t dchgp = 0;
static uint8_t dcur = 0;
uint8_t i2c_bbpll_lref = 0;
uint8_t i2c_bbpll_div_7_0 = 0;
uint8_t i2c_bbpll_dcur = 0;
if (pll_freq == RTC_PLL_FREQ_480M)
{
/* Set this register to let the digital part know 480M PLL is used */
modifyreg32(SYSTEM_CPU_PER_CONF_REG, 0, SYSTEM_PLL_FREQ_SEL);
/* Configure 480M PLL */
div_ref = 0;
div7_0 = 8;
dr1 = 0;
dr3 = 0;
dchgp = 5;
dcur = 4;
REGI2C_WRITE(I2C_BBPLL, I2C_BBPLL_MODE_HF, 0x6b);
}
else
{
/* Clear this register to let the digital part know 320M PLL is used */
modifyreg32(SYSTEM_CPU_PER_CONF_REG, SYSTEM_PLL_FREQ_SEL, 0);
/* Configure 320M PLL */
div_ref = 0;
div7_0 = 4;
dr1 = 0;
dr3 = 0;
dchgp = 5;
dcur = 5;
REGI2C_WRITE(I2C_BBPLL, I2C_BBPLL_MODE_HF, 0x69);
}
i2c_bbpll_lref = (dchgp << I2C_BBPLL_OC_DCHGP_LSB) | (div_ref);
i2c_bbpll_div_7_0 = div7_0;
i2c_bbpll_dcur = (1 << I2C_BBPLL_OC_DLREF_SEL_LSB) |
(2 << I2C_BBPLL_OC_DHREF_SEL_LSB) | dcur;
REGI2C_WRITE(I2C_BBPLL, I2C_BBPLL_OC_REF_DIV, i2c_bbpll_lref);
REGI2C_WRITE(I2C_BBPLL, I2C_BBPLL_OC_DIV_7_0, i2c_bbpll_div_7_0);
REGI2C_WRITE_MASK(I2C_BBPLL, I2C_BBPLL_OC_DR1, dr1);
REGI2C_WRITE_MASK(I2C_BBPLL, I2C_BBPLL_OC_DR3, dr3);
REGI2C_WRITE(I2C_BBPLL, I2C_BBPLL_OC_DCUR, i2c_bbpll_dcur);
REGI2C_WRITE_MASK(I2C_BBPLL, I2C_BBPLL_OC_DHREF_SEL, 2);
REGI2C_WRITE_MASK(I2C_BBPLL, I2C_BBPLL_OC_DLREF_SEL, 1);
}
/****************************************************************************
* Name: esp32s2_rtc_clk_set
*
* Description:
* Set RTC CLK frequency.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void esp32s2_rtc_clk_set(void)
{
enum esp32s2_rtc_fast_freq_e fast_freq = RTC_FAST_FREQ_8M;
enum esp32s2_slow_clk_sel_e slow_clk = SLOW_CLK_90K;
#if defined(CONFIG_ESP32S2_RTC_CLK_EXT_XTAL)
slow_clk = SLOW_CLK_32K_XTAL;
#elif defined(CONFIG_ESP32S2_RTC_CLK_EXT_OSC)
slow_clk = SLOW_CLK_32K_EXT_OSC;
#elif defined(CONFIG_ESP32S2_RTC_CLK_INT_8MD256)
slow_clk = SLOW_CLK_8MD256;
#endif
esp32s2_rtc_clk_fast_freq_set(fast_freq);
esp32s2_select_rtc_slow_clk(slow_clk);
}
/****************************************************************************
* Name: esp32s2_rtc_init
*
* Description:
* Initialize RTC clock and power control related functions.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_init(void)
{
struct esp32s2_rtc_priv_s cfg = RTC_CONFIG_DEFAULT();
modifyreg32(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_PVTMON_PU, 0);
modifyreg32(RTC_CNTL_TIMER1_REG, 0,
cfg.pll_wait ? RTC_CNTL_PLL_BUF_WAIT : 0);
modifyreg32(RTC_CNTL_TIMER1_REG, 0,
cfg.ck8m_wait ? RTC_CNTL_CK8M_WAIT : 0);
/* Moved from rtc sleep to rtc init to save sleep function running time */
/* set shortest possible sleep time limit */
REG_SET_FIELD(RTC_CNTL_TIMER5_REG, RTC_CNTL_MIN_SLP_VAL,
RTC_CNTL_MIN_SLP_VAL_MIN);
/* set wifi timer */
REG_SET_FIELD(RTC_CNTL_TIMER3_REG, RTC_CNTL_WIFI_POWERUP_TIMER, 1);
REG_SET_FIELD(RTC_CNTL_TIMER3_REG, RTC_CNTL_WIFI_WAIT_TIMER, 1);
if (cfg.cali_ocode)
{
/* TODO: Use calibration from efuse if configured */
esp32s2_rtc_calibrate_ocode();
}
if (cfg.clkctl_init)
{
/* clear CMMU clock force on */
modifyreg32(EXTMEM_PRO_CACHE_MMU_POWER_CTRL_REG,
EXTMEM_PRO_CACHE_MMU_MEM_FORCE_ON, 0);
/* clear rom clock force on */
REG_SET_FIELD(SYSTEM_ROM_CTRL_0_REG, SYSTEM_ROM_FO, 0);
/* clear tag clock force on */
REG_SET_FIELD(SYSTEM_SRAM_CTRL_0_REG, SYSTEM_SRAM_FO, 0);
/* clear tag clock force on */
modifyreg32(EXTMEM_PRO_DCACHE_TAG_POWER_CTRL_REG,
EXTMEM_PRO_DCACHE_TAG_MEM_FORCE_ON, 0);
modifyreg32(EXTMEM_PRO_ICACHE_TAG_POWER_CTRL_REG,
EXTMEM_PRO_ICACHE_TAG_MEM_FORCE_ON, 0);
/* clear register clock force on */
modifyreg32(SPI_MEM_CLOCK_GATE_REG(0), SPI_MEM_CLK_EN, 0);
modifyreg32(SPI_MEM_CLOCK_GATE_REG(1), SPI_MEM_CLK_EN, 0);
}
if (cfg.pwrctl_init)
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_FORCE_PU, 0);
/* Cancel xtal force pu if no need to force power up
* Cannot cancel xtal force pu if pll is force power on
*/
if (!(cfg.xtal_fpu || cfg.bbpll_fpu))
{
modifyreg32(RTC_CNTL_OPTIONS0_REG, RTC_CNTL_XTL_FORCE_PU, 0);
}
else
{
modifyreg32(RTC_CNTL_OPTIONS0_REG, 0, RTC_CNTL_XTL_FORCE_PU);
}
/* CLEAR APLL close */
CLEAR_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_PLLA_FORCE_PU);
SET_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_PLLA_FORCE_PD);
/* Cancel bbpll force pu if setting no force power up */
if (!cfg.bbpll_fpu)
{
modifyreg32(RTC_CNTL_OPTIONS0_REG,
RTC_CNTL_BBPLL_FORCE_PU |
RTC_CNTL_BBPLL_I2C_FORCE_PU |
RTC_CNTL_BB_I2C_FORCE_PU, 0);
}
else
{
modifyreg32(RTC_CNTL_OPTIONS0_REG, 0,
RTC_CNTL_BBPLL_FORCE_PU |
RTC_CNTL_BBPLL_I2C_FORCE_PU |
RTC_CNTL_BB_I2C_FORCE_PU);
}
/* Cancel RTC REG force PU */
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_FORCE_PU, 0);
modifyreg32(RTC_CNTL_REG, RTC_CNTL_REGULATOR_FORCE_PU |
RTC_CNTL_DBOOST_FORCE_PU, 0);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_SLOWMEM_FORCE_PU |
RTC_CNTL_FASTMEM_FORCE_PU |
RTC_CNTL_SLOWMEM_FORCE_NOISO |
RTC_CNTL_FASTMEM_FORCE_NOISO, 0);
if (cfg.rtc_dboost_fpd)
{
modifyreg32(RTC_CNTL_REG, 0, RTC_CNTL_DBOOST_FORCE_PD);
}
else
{
modifyreg32(RTC_CNTL_REG, RTC_CNTL_DBOOST_FORCE_PD, 0);
}
/* cancel digital pu force */
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_SLOWMEM_FORCE_PU |
RTC_CNTL_FASTMEM_FORCE_PU, 0);
/* If this mask is enabled, all soc mem cannot enter power down mode
* We should control soc memory power down mode from RTC, so we will
* not touch this register any more
*/
modifyreg32(SYSTEM_MEM_PD_MASK_REG, SYSTEM_LSLP_MEM_PD_MASK, 0);
/* If this pd_cfg is set to 1, all memory won't enter low power mode
* during light sleep.
* If this pd_cfg is set to 0, all memory will enter low power mode
* during light sleep.
*/
struct esp32s2_rtc_sleep_pd_config_s
pu_cfg = RTC_SLEEP_PD_CONFIG_ALL(0);
esp32s2_rtc_sleep_pd(pu_cfg);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_DG_WRAP_FORCE_PU, 0);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_WIFI_FORCE_PU, 0);
modifyreg32(RTC_CNTL_DIG_ISO_REG, RTC_CNTL_DG_WRAP_FORCE_NOISO |
RTC_CNTL_DG_WRAP_FORCE_ISO, 0);
modifyreg32(RTC_CNTL_DIG_ISO_REG, RTC_CNTL_WIFI_FORCE_NOISO |
RTC_CNTL_DG_WRAP_FORCE_NOISO, 0);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_FORCE_NOISO, 0);
/* cancel digital PADS force no iso */
if (cfg.cpu_waiti_clk_gate)
{
modifyreg32(SYSTEM_CPU_PER_CONF_REG,
SYSTEM_CPU_WAIT_MODE_FORCE_ON, 0);
}
else
{
modifyreg32(SYSTEM_CPU_PER_CONF_REG, 0,
SYSTEM_CPU_WAIT_MODE_FORCE_ON);
}
/* If SYSTEM_CPU_WAIT_MODE_FORCE_ON == 0, the cpu clk will be closed
* when cpu enter WAITI mode
*/
modifyreg32(RTC_CNTL_DIG_ISO_REG, RTC_CNTL_DG_PAD_FORCE_UNHOLD |
RTC_CNTL_DG_PAD_FORCE_NOISO, 0);
}
}
/****************************************************************************
* Name: esp32s2_rtc_time_get
*
* Description:
* Get current value of RTC counter.
*
* Input Parameters:
* None
*
* Returned Value:
* Current value of RTC counter
*
****************************************************************************/
uint64_t IRAM_ATTR esp32s2_rtc_time_get(void)
{
uint64_t rtc_time;
modifyreg32(RTC_CNTL_TIME_UPDATE_REG, 0, RTC_CNTL_TIME_UPDATE);
rtc_time = getreg32(RTC_CNTL_TIME0_REG);
rtc_time |= ((uint64_t) getreg32(RTC_CNTL_TIME1_REG)) << 32;
return rtc_time;
}
/****************************************************************************
* Name: esp32s2_rtc_time_us_to_slowclk
*
* Description:
* Convert time interval from microseconds to RTC_SLOW_CLK cycles.
*
* Input Parameters:
* time_in_us - Time interval in microseconds
* period - Period of slow clock in microseconds
*
* Returned Value:
* Number of slow clock cycles
*
****************************************************************************/
uint64_t IRAM_ATTR esp32s2_rtc_time_us_to_slowclk(uint64_t time_in_us,
uint32_t period)
{
uint64_t slow_clk_cycles = 0;
uint64_t max_time_in_us = (UINT64_C(1) << 45) - 1;
/* Handle overflow that would happen if time_in_us >= 2^45 */
while (time_in_us > max_time_in_us)
{
time_in_us -= max_time_in_us;
slow_clk_cycles += ((max_time_in_us << RTC_CLK_CAL_FRACT) / period);
}
slow_clk_cycles += ((time_in_us << RTC_CLK_CAL_FRACT) / period);
return slow_clk_cycles;
}
/****************************************************************************
* Name: esp32s2_rtc_time_slowclk_to_us
*
* Description:
* Convert time interval from RTC_SLOW_CLK to microseconds
*
* Input Parameters:
* rtc_cycles - Time interval in RTC_SLOW_CLK cycles
* period - Period of slow clock in microseconds
*
* Returned Value:
* Time interval in microseconds
*
****************************************************************************/
uint64_t IRAM_ATTR esp32s2_rtc_time_slowclk_to_us(uint64_t rtc_cycles,
uint32_t period)
{
return (rtc_cycles * period) >> RTC_CLK_CAL_FRACT;
}
/****************************************************************************
* Name: esp32s2_clk_slowclk_cal_get
*
* Description:
* Get the calibration value of RTC slow clock.
*
* Input Parameters:
* None
*
* Returned Value:
* The calibration value obtained using rtc_clk_cal
*
****************************************************************************/
uint32_t IRAM_ATTR esp32s2_clk_slowclk_cal_get(void)
{
return getreg32(RTC_SLOW_CLK_CAL_REG);
}
/****************************************************************************
* Name: esp32s2_rtc_sleep_set_wakeup_time
*
* Description:
* Set target value of RTC counter for RTC_TIMER_TRIG_EN wakeup source.
*
* Input Parameters:
* t - value of RTC counter at which wakeup from sleep will happen.
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_sleep_set_wakeup_time(uint64_t t)
{
putreg32(t & UINT32_MAX, RTC_CNTL_SLP_TIMER0_REG);
putreg32((uint32_t)(t >> 32), RTC_CNTL_SLP_TIMER1_REG);
}
/****************************************************************************
* Name: esp32s2_rtc_wait_for_slow_cycle
*
* Description:
* Busy loop until next RTC_SLOW_CLK cycle.
*
* Input Parameters:
* None
*
* Returned Value:
* none
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_wait_for_slow_cycle(void)
{
modifyreg32(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START_CYCLING |
TIMG_RTC_CALI_START, 0);
modifyreg32(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_RDY, 0);
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_CLK_SEL,
RTC_CAL_RTC_MUX);
/* Request to run calibration for 0 slow clock cycles.
* RDY bit will be set on the nearest slow clock cycle.
*/
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_MAX, 0);
modifyreg32(TIMG_RTCCALICFG_REG(0), 0, TIMG_RTC_CALI_START);
/* RDY needs some time to go low */
up_udelay(1);
while (!(getreg32(TIMG_RTCCALICFG_REG(0)) & TIMG_RTC_CALI_RDY))
{
up_udelay(1);
}
}
void esp32s2_rtc_clk_apb_freq_update(uint32_t apb_freq)
{
g_apb_freq = apb_freq;
}
uint32_t esp32s2_rtc_clk_apb_freq_get(void)
{
return g_apb_freq;
}
/****************************************************************************
* Name: esp32s2_rtc_cpu_freq_set_xtal
*
* Description:
* Switch CPU clock source to XTAL
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_cpu_freq_set_xtal(void)
{
int freq_mhz = (int) esp32s2_rtc_clk_xtal_freq_get();
esp32s2_rtc_update_to_xtal(freq_mhz, 1);
esp32s2_rtc_wait_for_slow_cycle();
}
/****************************************************************************
* Name: esp_rtc_clk_get_cpu_freq
*
* Description:
* Get the currently used CPU frequency configuration.
*
* Input Parameters:
* None
*
* Returned Value:
* CPU frequency
*
****************************************************************************/
int IRAM_ATTR esp_rtc_clk_get_cpu_freq(void)
{
uint32_t source_freq_mhz;
uint32_t div;
uint32_t soc_clk_sel;
uint32_t cpuperiod_sel;
int freq_mhz = 0;
soc_clk_sel = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG, SYSTEM_SOC_CLK_SEL);
switch (soc_clk_sel)
{
case DPORT_SOC_CLK_SEL_XTAL:
{
div = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_PRE_DIV_CNT) + 1;
source_freq_mhz = (uint32_t) esp32s2_rtc_clk_xtal_freq_get();
freq_mhz = source_freq_mhz / div;
}
break;
case DPORT_SOC_CLK_SEL_PLL:
{
cpuperiod_sel = REG_GET_FIELD(SYSTEM_CPU_PER_CONF_REG,
SYSTEM_CPUPERIOD_SEL);
uint32_t pllfreq_sel = REG_GET_FIELD(SYSTEM_CPU_PER_CONF_REG,
SYSTEM_PLL_FREQ_SEL);
source_freq_mhz = (pllfreq_sel) ? RTC_PLL_FREQ_480M :
RTC_PLL_FREQ_320M;
if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_80)
{
div = (source_freq_mhz == RTC_PLL_FREQ_480M) ? 6 : 4;
freq_mhz = 480 / div;
}
else if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_160)
{
div = 3;
freq_mhz = 480 / div;
}
else if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_240)
{
div = 2;
freq_mhz = 480 / div;
}
else
{
rtcerr("unsupported frequency configuration");
return -ENODEV;
}
}
break;
case DPORT_SOC_CLK_SEL_8M:
{
source_freq_mhz = 8;
div = 1;
freq_mhz = source_freq_mhz / div;
}
break;
default:
{
rtcerr("unsupported frequency configuration");
return -ENODEV;
}
}
return freq_mhz;
}
/****************************************************************************
* Name: esp32s2_rtc_sleep_init
*
* Description:
* Prepare the chip to enter sleep mode
*
* Input Parameters:
* flags - sleep mode configuration
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_sleep_init(uint32_t flags)
{
struct esp32s2_rtc_sleep_config_s cfg = RTC_SLEEP_CONFIG_DEFAULT(flags);
/* Starts here */
if (cfg.lslp_mem_inf_fpu)
{
struct esp32s2_rtc_sleep_pd_config_s
pu_cfg = RTC_SLEEP_PD_CONFIG_ALL(1);
esp32s2_rtc_sleep_pd(pu_cfg);
}
if (cfg.rtc_mem_inf_follow_cpu)
{
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_SLOWMEM_FOLW_CPU |
RTC_CNTL_FASTMEM_FOLW_CPU);
}
else
{
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_SLOWMEM_FOLW_CPU |
RTC_CNTL_FASTMEM_FOLW_CPU, 0);
}
if (cfg.rtc_fastmem_pd_en)
{
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_FASTMEM_PD_EN);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_FASTMEM_FORCE_PU, 0);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_FASTMEM_FORCE_NOISO, 0);
}
else
{
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_FASTMEM_PD_EN, 0);
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_FASTMEM_FORCE_PU);
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_FASTMEM_FORCE_NOISO);
}
if (cfg.rtc_slowmem_pd_en)
{
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_SLOWMEM_PD_EN);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_SLOWMEM_FORCE_PU, 0);
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_SLOWMEM_FORCE_NOISO, 0);
}
else
{
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_SLOWMEM_PD_EN, 0);
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_SLOWMEM_FORCE_PU);
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_SLOWMEM_FORCE_NOISO);
}
if (cfg.wifi_pd_en)
{
modifyreg32(RTC_CNTL_DIG_ISO_REG, RTC_CNTL_WIFI_FORCE_NOISO |
RTC_CNTL_WIFI_FORCE_ISO, 0);
modifyreg32(RTC_CNTL_DIG_PWC_REG, RTC_CNTL_WIFI_FORCE_PU, 0);
modifyreg32(RTC_CNTL_DIG_PWC_REG, 0, RTC_CNTL_WIFI_PD_EN);
}
else
{
modifyreg32(RTC_CNTL_DIG_PWC_REG, RTC_CNTL_WIFI_PD_EN, 0);
}
if (cfg.rtc_peri_pd_en)
{
modifyreg32(RTC_CNTL_PWC_REG, 0, RTC_CNTL_PD_EN);
}
else
{
modifyreg32(RTC_CNTL_PWC_REG, RTC_CNTL_PD_EN, 0);
}
REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_DBIAS_SLP, cfg.rtc_dbias_slp);
REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_DIG_DBIAS_SLP, cfg.dig_dbias_slp);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_DBG_ATTEN_MONITOR,
RTC_CNTL_DBG_ATTEN_MONITOR_DEFAULT);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_BIAS_SLEEP_MONITOR,
RTC_CNTL_BIASSLP_MONITOR_DEFAULT);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_BIAS_SLEEP_DEEP_SLP,
(!cfg.deep_slp && cfg.xtal_fpu) ? RTC_CNTL_BIASSLP_SLEEP_ON :
RTC_CNTL_BIASSLP_SLEEP_DEFAULT);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_PD_CUR_MONITOR,
RTC_CNTL_PD_CUR_MONITOR_DEFAULT);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_PD_CUR_DEEP_SLP,
(!cfg.deep_slp && cfg.xtal_fpu) ? RTC_CNTL_PD_CUR_SLEEP_ON :
RTC_CNTL_PD_CUR_SLEEP_DEFAULT);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_DBG_ATTEN_DEEP_SLP,
cfg.dbg_atten_slp);
if (cfg.deep_slp)
{
modifyreg32(RTC_CNTL_DIG_ISO_REG, RTC_CNTL_DG_PAD_FORCE_ISO |
RTC_CNTL_DG_PAD_FORCE_NOISO, 0);
/* Shut down parts of RTC which may have been left
* enabled by the wireless drivers.
*/
modifyreg32(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_CKGEN_I2C_PU |
RTC_CNTL_PLL_I2C_PU | RTC_CNTL_RFRX_PBUS_PU |
RTC_CNTL_TXRF_I2C_PU, 0);
}
else
{
modifyreg32(RTC_CNTL_DIG_PWC_REG, RTC_CNTL_DG_WRAP_PD_EN, 0);
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG,
RTC_CNTL_DBG_ATTEN_DEEP_SLP, 0);
}
REG_SET_FIELD(RTC_CNTL_OPTIONS0_REG, RTC_CNTL_XTL_FORCE_PU,
cfg.xtal_fpu);
if (REG_GET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_ANA_CLK_RTC_SEL) ==
RTC_SLOW_FREQ_8MD256)
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, 0, RTC_CNTL_CK8M_FORCE_PU);
}
else
{
modifyreg32(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_FORCE_PU, 0);
}
/* Keep the RTC8M_CLK on in light_sleep mode if the
* ledc low-speed channel is clocked by RTC8M_CLK.
*/
if (!cfg.deep_slp && GET_PERI_REG_MASK(RTC_CNTL_CLK_CONF_REG,
RTC_CNTL_DIG_CLK8M_EN_M))
{
REG_CLR_BIT(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_FORCE_PD);
REG_SET_BIT(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_FORCE_PU);
}
/* enable VDDSDIO control by state machine */
modifyreg32(RTC_CNTL_SDIO_CONF_REG, RTC_CNTL_SDIO_FORCE, 0);
REG_SET_FIELD(RTC_CNTL_SDIO_CONF_REG, RTC_CNTL_SDIO_REG_PD_EN,
cfg.vddsdio_pd_en);
REG_SET_FIELD(RTC_CNTL_SLP_REJECT_CONF_REG,
RTC_CNTL_DEEP_SLP_REJECT_EN, cfg.deep_slp_reject);
REG_SET_FIELD(RTC_CNTL_SLP_REJECT_CONF_REG,
RTC_CNTL_LIGHT_SLP_REJECT_EN, cfg.light_slp_reject);
REG_SET_FIELD(RTC_CNTL_OPTIONS0_REG, RTC_CNTL_XTL_FORCE_PU,
cfg.xtal_fpu);
}
/****************************************************************************
* Name: esp32s2_rtc_sleep_start
*
* Description:
* Enter force sleep mode.
*
* Input Parameters:
* wakeup_opt - bit mask wake up reasons to enable
* reject_opt - bit mask of sleep reject reasons.
*
* Returned Value:
* Non-zero if sleep was rejected by hardware
*
****************************************************************************/
int IRAM_ATTR esp32s2_rtc_sleep_start(uint32_t wakeup_opt,
uint32_t reject_opt)
{
int reject;
REG_SET_FIELD(RTC_CNTL_WAKEUP_STATE_REG,
RTC_CNTL_WAKEUP_ENA, wakeup_opt);
putreg32((uint32_t)reject_opt, RTC_CNTL_SLP_REJECT_CONF_REG);
/* Start entry into sleep mode */
modifyreg32(RTC_CNTL_STATE0_REG, 0, RTC_CNTL_SLEEP_EN);
while ((getreg32(RTC_CNTL_INT_RAW_RTC_REG) &
(RTC_CNTL_SLP_REJECT_INT_RAW | RTC_CNTL_SLP_WAKEUP_INT_RAW)) == 0);
/* In deep sleep mode, we never get here */
reject = REG_GET_FIELD(RTC_CNTL_INT_RAW_RTC_REG,
RTC_CNTL_SLP_REJECT_INT_RAW);
modifyreg32(RTC_CNTL_INT_CLR_RTC_REG, 0,
RTC_CNTL_SLP_REJECT_INT_CLR | RTC_CNTL_SLP_WAKEUP_INT_CLR);
/* restore DBG_ATTEN to the default value */
REG_SET_FIELD(RTC_CNTL_BIAS_CONF_REG, RTC_CNTL_DBG_ATTEN_DEEP_SLP,
RTC_CNTL_DBG_ATTEN_LIGHTSLEEP_DEFAULT);
return reject;
}
/****************************************************************************
* Name: esp32s2_rtc_clk_cpu_freq_set_config
*
* Description:
* Set CPU frequency configuration.
*
* Input Parameters:
* config - CPU frequency configuration
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_clk_cpu_freq_set_config(
const struct esp32s2_cpu_freq_config_s *config)
{
uint32_t soc_clk_sel = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_SOC_CLK_SEL);
if (config->source == RTC_CPU_FREQ_SRC_XTAL)
{
esp32s2_rtc_update_to_xtal(config->freq_mhz, config->div);
if (soc_clk_sel == DPORT_SOC_CLK_SEL_PLL)
{
esp32s2_rtc_clk_bbpll_disable();
}
}
else if (config->source == RTC_CPU_FREQ_SRC_PLL)
{
if (soc_clk_sel != DPORT_SOC_CLK_SEL_PLL)
{
modifyreg32(RTC_CNTL_OPTIONS0_REG, RTC_CNTL_BB_I2C_FORCE_PD |
RTC_CNTL_BBPLL_FORCE_PD | RTC_CNTL_BBPLL_I2C_FORCE_PD,
0);
esp32s2_rtc_bbpll_configure(esp32s2_rtc_clk_xtal_freq_get(),
config->source_freq_mhz);
}
esp32s2_rtc_clk_cpu_freq_to_pll_mhz(config->freq_mhz);
}
else if (config->source == RTC_CPU_FREQ_SRC_8M)
{
esp32s2_rtc_clk_cpu_freq_to_8m();
if (soc_clk_sel == DPORT_SOC_CLK_SEL_PLL)
{
esp32s2_rtc_clk_bbpll_disable();
}
}
}
/****************************************************************************
* Name: esp32s2_rtc_clk_cpu_freq_get_config
*
* Description:
* Get the currently used CPU frequency configuration.
*
* Input Parameters:
* out_config - CPU frequency configuration
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_clk_cpu_freq_get_config(
struct esp32s2_cpu_freq_config_s *out_config)
{
uint32_t div = 3;
uint32_t freq_mhz = 160;
uint32_t source_freq_mhz = RTC_PLL_FREQ_480M;
enum esp32s2_rtc_cpu_freq_src_e source = RTC_CPU_FREQ_SRC_PLL;
uint32_t soc_clk_sel = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_SOC_CLK_SEL);
switch (soc_clk_sel)
{
case DPORT_SOC_CLK_SEL_XTAL:
{
source = RTC_CPU_FREQ_SRC_XTAL;
div = REG_GET_FIELD(SYSTEM_SYSCLK_CONF_REG,
SYSTEM_PRE_DIV_CNT) + 1;
source_freq_mhz = (uint32_t) esp32s2_rtc_clk_xtal_freq_get();
freq_mhz = source_freq_mhz / div;
}
break;
case DPORT_SOC_CLK_SEL_PLL:
{
uint32_t cpuperiod_sel = REG_GET_FIELD(SYSTEM_CPU_PER_CONF_REG,
SYSTEM_CPUPERIOD_SEL);
uint32_t pllfreq_sel = REG_GET_FIELD(SYSTEM_CPU_PER_CONF_REG,
SYSTEM_PLL_FREQ_SEL);
source = RTC_CPU_FREQ_SRC_PLL;
source_freq_mhz = (pllfreq_sel) ?
RTC_PLL_FREQ_480M : RTC_PLL_FREQ_320M;
if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_80)
{
div = (source_freq_mhz == RTC_PLL_FREQ_480M) ? 6 : 4;
freq_mhz = 80;
}
else if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_160)
{
div = (source_freq_mhz == RTC_PLL_FREQ_480M) ? 3 : 2;
div = 3;
freq_mhz = 160;
}
else if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_240)
{
div = 2;
freq_mhz = 240;
}
else
{
return;
}
}
break;
case DPORT_SOC_CLK_SEL_8M:
{
source = RTC_CPU_FREQ_SRC_8M;
source_freq_mhz = 8;
div = 1;
freq_mhz = source_freq_mhz;
}
break;
default:
PANIC();
break;
}
*out_config = (struct esp32s2_cpu_freq_config_s)
{
.source = source,
.source_freq_mhz = source_freq_mhz,
.div = div,
.freq_mhz = freq_mhz
};
}
/****************************************************************************
* Name: esp32s2_rtc_get_time_us
*
* Description:
* Get current value of RTC counter in microseconds
*
* Input Parameters:
* None
*
* Returned Value:
* Current value of RTC counter in microseconds
*
****************************************************************************/
uint64_t esp32s2_rtc_get_time_us(void)
{
const uint32_t cal = getreg32(RTC_SLOW_CLK_CAL_REG);
const uint64_t rtc_this_ticks = esp32s2_rtc_time_get();
/* RTC counter result is up to 2^48, calibration factor is up to 2^24,
* for a 32KHz clock. We need to calculate (assuming no overflow):
* (ticks * cal) >> RTC_CLK_CAL_FRACT. An overflow in the (ticks * cal)
* multiplication would cause time to wrap around after approximately
* 13 days, which is probably not enough for some applications.
* Therefore multiplication is split into two terms, for the lower 32-bit
* and the upper 16-bit parts of "ticks", i.e.:
* ((ticks_low + 2^32 * ticks_high) * cal) >> RTC_CLK_CAL_FRACT
*/
const uint64_t ticks_low = rtc_this_ticks & UINT32_MAX;
const uint64_t ticks_high = rtc_this_ticks >> 32;
const uint64_t delta_time_us = ((ticks_low * cal) >> RTC_CLK_CAL_FRACT) +
((ticks_high * cal) << (32 - RTC_CLK_CAL_FRACT));
return delta_time_us;
}
/****************************************************************************
* Name: esp32_rtc_bbpll_disable
*
* Description:
* Disable BBPLL.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_bbpll_disable(void)
{
modifyreg32(RTC_CNTL_OPTIONS0_REG, 0, RTC_CNTL_BB_I2C_FORCE_PD |
RTC_CNTL_BBPLL_FORCE_PD | RTC_CNTL_BBPLL_I2C_FORCE_PD);
}
/****************************************************************************
* Name: esp32s2_rtc_set_boot_time
*
* Description:
* Set time to RTC register to replace the original boot time.
*
* Input Parameters:
* time_us - set time in microseconds.
*
* Returned Value:
* None
*
****************************************************************************/
void IRAM_ATTR esp32s2_rtc_set_boot_time(uint64_t time_us)
{
putreg32((uint32_t)(time_us & UINT32_MAX), RTC_BOOT_TIME_LOW_REG);
putreg32((uint32_t)(time_us >> 32), RTC_BOOT_TIME_HIGH_REG);
}
/****************************************************************************
* Name: esp32s2_rtc_get_boot_time
*
* Description:
* Get time of RTC register to indicate the original boot time.
*
* Input Parameters:
* None
*
* Returned Value:
* Get time in microseconds.
*
****************************************************************************/
uint64_t IRAM_ATTR esp32s2_rtc_get_boot_time(void)
{
return ((uint64_t)getreg32(RTC_BOOT_TIME_LOW_REG))
+ (((uint64_t)getreg32(RTC_BOOT_TIME_HIGH_REG)) << 32);
}
/****************************************************************************
* Name: up_rtc_time
*
* Description:
* Get the current time in seconds. This is similar to the standard time()
* function. This interface is only required if the low-resolution
* RTC/counter hardware implementation is selected. It is only used by the
* RTOS during initialization to set up the system time when CONFIG_RTC is
* set but CONFIG_RTC_HIRES is not set.
*
* Input Parameters:
* None
*
* Returned Value:
* The current time in seconds
*
****************************************************************************/
#ifndef CONFIG_RTC_HIRES
time_t up_rtc_time(void)
{
uint64_t time_us;
irqstate_t flags;
flags = spin_lock_irqsave(NULL);
/* NOTE: RT-Timer starts to work after the board is initialized, and the
* RTC controller starts works after up_rtc_initialize is initialized.
* Since the system clock starts to work before the board is initialized,
* if CONFIG_RTC is enabled, the system time must be matched by the time
* of the RTC controller (up_rtc_initialize has already been initialized,
* and RT-Timer cannot work).
*/
/* Determine if RT-Timer is started */
if (g_rt_timer_enabled == true)
{
/* Get the time from RT-Timer, the time interval between RTC
* controller and RT-Timer is stored in g_rtc_save->offset.
*/
time_us = rt_timer_time_us() + g_rtc_save->offset +
esp32s2_rtc_get_boot_time();
}
else
{
/* Get the time from RTC controller. */
time_us = esp32s2_rtc_get_time_us() + esp32s2_rtc_get_boot_time();
}
spin_unlock_irqrestore(NULL, flags);
return (time_t)(time_us / USEC_PER_SEC);
}
#endif /* !CONFIG_RTC_HIRES */
/****************************************************************************
* Name: up_rtc_settime
*
* Description:
* Set the RTC to the provided time. All RTC implementations must be
* able to set their time based on a standard timespec.
*
* Input Parameters:
* ts - the time to use
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int up_rtc_settime(const struct timespec *ts)
{
irqstate_t flags;
uint64_t now_us;
uint64_t rtc_offset_us;
DEBUGASSERT(ts != NULL && ts->tv_nsec < NSEC_PER_SEC);
flags = spin_lock_irqsave(NULL);
now_us = ((uint64_t) ts->tv_sec) * USEC_PER_SEC +
ts->tv_nsec / NSEC_PER_USEC;
if (g_rt_timer_enabled == true)
{
/* Set based on RT-Timer offset value. */
rtc_offset_us = now_us - rt_timer_time_us();
}
else
{
/* Set based on the offset value of the RT controller. */
rtc_offset_us = now_us - esp32s2_rtc_get_time_us();
}
g_rtc_save->offset = 0;
esp32s2_rtc_set_boot_time(rtc_offset_us);
spin_unlock_irqrestore(NULL, flags);
return OK;
}
/****************************************************************************
* Name: up_rtc_initialize
*
* Description:
* Initialize the hardware RTC per the selected configuration.
* This function is called once during the OS initialization sequence
*
* Input Parameters:
* None
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int up_rtc_initialize(void)
{
g_rtc_save = &rtc_saved_data;
/* If saved data is invalid, clear offset information */
if (g_rtc_save->magic != MAGIC_RTC_SAVE)
{
g_rtc_save->magic = MAGIC_RTC_SAVE;
g_rtc_save->offset = 0;
esp32s2_rtc_set_boot_time(0);
}
#ifdef CONFIG_RTC_HIRES
/* Synchronize the base time to the RTC time */
up_rtc_gettime(&g_basetime);
#endif
g_rtc_enabled = true;
return OK;
}
/****************************************************************************
* Name: up_rtc_gettime
*
* Description:
* Get the current time from the high resolution RTC time or RT-Timer. This
* interface is only supported by the high-resolution RTC/counter hardware
* implementation. It is used to replace the system timer.
*
* Input Parameters:
* tp - The location to return the RTC time or RT-Timer value.
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
#ifdef CONFIG_RTC_HIRES
int up_rtc_gettime(struct timespec *tp)
{
irqstate_t flags;
uint64_t time_us;
flags = spin_lock_irqsave(NULL);
if (g_rt_timer_enabled == true)
{
time_us = rt_timer_time_us() + g_rtc_save->offset +
esp32s2_rtc_get_boot_time();
}
else
{
time_us = esp32s2_rtc_get_time_us() + esp32s2_rtc_get_boot_time();
}
tp->tv_sec = time_us / USEC_PER_SEC;
tp->tv_nsec = (time_us % USEC_PER_SEC) * NSEC_PER_USEC;
spin_unlock_irqrestore(NULL, flags);
return OK;
}
#endif /* CONFIG_RTC_HIRES */
#ifdef CONFIG_RTC_ALARM
/****************************************************************************
* Name: up_rtc_setalarm
*
* Description:
* Set up an alarm.
*
* Input Parameters:
* alminfo - Information about the alarm configuration.
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int up_rtc_setalarm(struct alm_setalarm_s *alminfo)
{
struct rt_timer_args_s rt_timer_args;
struct alm_cbinfo_s *cbinfo;
irqstate_t flags;
int ret = -EBUSY;
int id;
DEBUGASSERT(alminfo != NULL);
DEBUGASSERT((RTC_ALARM0 <= alminfo->as_id) &&
(alminfo->as_id < RTC_ALARM_LAST));
/* Set the alarm in RT-Timer */
id = alminfo->as_id;
cbinfo = &g_alarmcb[id];
if (cbinfo->ac_cb == NULL)
{
/* Create the RT-Timer alarm */
flags = spin_lock_irqsave(NULL);
if (cbinfo->alarm_hdl == NULL)
{
cbinfo->index = id;
rt_timer_args.arg = cbinfo;
rt_timer_args.callback = esp32s2_rt_cb_handler;
ret = rt_timer_create(&rt_timer_args, &cbinfo->alarm_hdl);
if (ret < 0)
{
rtcerr("ERROR: Failed to create rt_timer error=%d\n", ret);
spin_unlock_irqrestore(NULL, flags);
return ret;
}
}
cbinfo->ac_cb = alminfo->as_cb;
cbinfo->ac_arg = alminfo->as_arg;
cbinfo->deadline_us = alminfo->as_time.tv_sec * USEC_PER_SEC +
alminfo->as_time.tv_nsec / NSEC_PER_USEC;
if (cbinfo->alarm_hdl == NULL)
{
rtcerr("ERROR: failed to create alarm timer\n");
}
else
{
rtcinfo("Start RTC alarm.\n");
rt_timer_start(cbinfo->alarm_hdl, cbinfo->deadline_us, false);
ret = OK;
}
spin_unlock_irqrestore(NULL, flags);
}
return ret;
}
/****************************************************************************
* Name: up_rtc_cancelalarm
*
* Description:
* Cancel an alarm.
*
* Input Parameters:
* alarmid - Identifies the alarm to be cancelled
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int up_rtc_cancelalarm(enum alm_id_e alarmid)
{
struct alm_cbinfo_s *cbinfo;
irqstate_t flags;
int ret = -ENODATA;
DEBUGASSERT((RTC_ALARM0 <= alarmid) &&
(alarmid < RTC_ALARM_LAST));
/* Set the alarm in hardware and enable interrupts */
cbinfo = &g_alarmcb[alarmid];
if (cbinfo->ac_cb != NULL)
{
flags = spin_lock_irqsave(NULL);
/* Stop and delete the alarm */
rtcinfo("Cancel RTC alarm.\n");
rt_timer_stop(cbinfo->alarm_hdl);
rt_timer_delete(cbinfo->alarm_hdl);
cbinfo->ac_cb = NULL;
cbinfo->deadline_us = 0;
cbinfo->alarm_hdl = NULL;
spin_unlock_irqrestore(NULL, flags);
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: up_rtc_rdalarm
*
* Description:
* Query an alarm configured in hardware.
*
* Input Parameters:
* tp - Location to return the timer match register.
* alarmid - Identifies the alarm to get.
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int up_rtc_rdalarm(struct timespec *tp, uint32_t alarmid)
{
irqstate_t flags;
struct alm_cbinfo_s *cbinfo;
DEBUGASSERT(tp != NULL);
DEBUGASSERT((RTC_ALARM0 <= alarmid) &&
(alarmid < RTC_ALARM_LAST));
flags = spin_lock_irqsave(NULL);
/* Get the alarm according to the alarmid */
cbinfo = &g_alarmcb[alarmid];
tp->tv_sec = (rt_timer_time_us() + g_rtc_save->offset +
cbinfo->deadline_us) / USEC_PER_SEC;
tp->tv_nsec = ((rt_timer_time_us() + g_rtc_save->offset +
cbinfo->deadline_us) % USEC_PER_SEC) * NSEC_PER_USEC;
spin_unlock_irqrestore(NULL, flags);
return OK;
}
#endif /* CONFIG_RTC_ALARM */
/****************************************************************************
* Name: up_rtc_timer_init
*
* Description:
* Init RTC timer.
*
* Input Parameters:
* None
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int up_rtc_timer_init(void)
{
/* RT-Timer enabled */
g_rt_timer_enabled = true;
/* Get the time difference between rt_timer and RTC timer */
g_rtc_save->offset = esp32s2_rtc_get_time_us() -
rt_timer_time_us();
return OK;
}
Reference in New Issue View Git Blame Copy Permalink