b84f45812e
Abdelatif Guettouche has submitted the ICLA and we can migrate the licenses to Apache. Gregory Nutt has submitted the SGA and we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
579 lines
16 KiB
C
579 lines
16 KiB
C
/****************************************************************************
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* drivers/timers/mcp794xx.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/signal.h>
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#include <nuttx/arch.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/timers/mcp794xx.h>
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#include "mcp794xx.h"
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#ifdef CONFIG_RTC_MCP794XX
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define MCP794XX_OSCRUN_READ_RETRY 5 /* How many time to read OSCRUN status */
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/* Configuration ************************************************************/
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/* This RTC implementation supports only date/time RTC hardware */
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#ifndef CONFIG_RTC_DATETIME
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# error CONFIG_RTC_DATETIME must be set to use this driver
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#endif
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#ifdef CONFIG_RTC_HIRES
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# error CONFIG_RTC_HIRES must NOT be set with this driver
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#endif
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#ifndef CONFIG_MCP794XX_I2C_FREQUENCY
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# error CONFIG_MCP794XX_I2C_FREQUENCY is not configured
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# define CONFIG_MCP794XX_I2C_FREQUENCY 400000
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#endif
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#if CONFIG_MCP794XX_I2C_FREQUENCY > 400000
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# error CONFIG_MCP794XX_I2C_FREQUENCY is out of range
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure describes the state of the MCP794XX chip.
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* Only a single RTC is supported.
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*/
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struct mcp794xx_dev_s
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{
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FAR struct i2c_master_s *i2c; /* Contained reference to the I2C bus driver. */
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uint8_t addr; /* The I2C device address. */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* g_rtc_enabled is set true after the RTC has successfully initialized */
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volatile bool g_rtc_enabled = false;
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* The state of the MCP794XX chip. Only a single RTC is supported */
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static struct mcp794xx_dev_s g_mcp794xx;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rtc_dumptime
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*
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* Description:
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* Show the broken out time.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_DEBUG_RTC_INFO
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static void rtc_dumptime(FAR struct tm *tp, FAR const char *msg)
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{
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rtcinfo("%s:\n", msg);
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rtcinfo(" tm_sec: %08x\n", tp->tm_sec);
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rtcinfo(" tm_min: %08x\n", tp->tm_min);
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rtcinfo(" tm_hour: %08x\n", tp->tm_hour);
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rtcinfo(" tm_mday: %08x\n", tp->tm_mday);
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rtcinfo(" tm_mon: %08x\n", tp->tm_mon);
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rtcinfo(" tm_year: %08x\n", tp->tm_year);
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rtcinfo(" tm_wday: %08x\n", tp->tm_wday);
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rtcinfo(" tm_yday: %08x\n", tp->tm_yday);
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rtcinfo(" tm_isdst: %08x\n", tp->tm_isdst);
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}
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#else
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# define rtc_dumptime(tp, msg)
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#endif
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/****************************************************************************
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* Name: rtc_bin2bcd
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*
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* Description:
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* Converts a 2 digit binary to BCD format
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*
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* Input Parameters:
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* value - The byte to be converted.
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*
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* Returned Value:
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* The value in BCD representation
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*
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****************************************************************************/
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static uint8_t rtc_bin2bcd(int value)
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{
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uint8_t msbcd = 0;
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while (value >= 10)
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{
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msbcd++;
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value -= 10;
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}
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return (msbcd << 4) | value;
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}
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/****************************************************************************
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* Name: rtc_bcd2bin
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*
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* Description:
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* Convert from 2 digit BCD to binary.
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*
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* Input Parameters:
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* value - The BCD value to be converted.
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*
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* Returned Value:
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* The value in binary representation
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*
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****************************************************************************/
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static int rtc_bcd2bin(uint8_t value)
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{
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int tens = ((int)value >> 4) * 10;
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return tens + (value & 0x0f);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mcp794xx_rtc_initialize
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*
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* Description:
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* Initialize the hardware RTC per the selected configuration. This
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* function is called once during the OS initialization sequence by board-
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* specific logic.
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*
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* After mcp794xx_rtc_initialize() is called, the OS function
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* clock_synchronize() should also be called to synchronize the system
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* timer to a hardware RTC. That operation is normally performed
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* automatically by the system during clock initialization. However, when
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* an external RTC is used, the board logic will need to explicitly re-
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* synchronize the system timer to the RTC when the RTC becomes available.
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*
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* Input Parameters:
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* i2c - An instance of the I2C interface used to access the MCP794XX
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* device
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* addr - The (7-bit) I2C address of the MCP794XX device
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno on failure
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*
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****************************************************************************/
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int mcp794xx_rtc_initialize(FAR struct i2c_master_s *i2c, uint8_t addr)
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{
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/* Remember the i2c device and claim that the RTC is enabled */
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g_mcp794xx.i2c = i2c;
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g_mcp794xx.addr = addr;
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g_rtc_enabled = true;
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return OK;
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}
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/****************************************************************************
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* Name: up_rtc_getdatetime
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*
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* Description:
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* Get the current date and time from the date/time RTC. This interface
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* is only supported by the date/time RTC hardware implementation.
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* It is used to replace the system timer. It is only used by the RTOS
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* during initialization to set up the system time when CONFIG_RTC and
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* CONFIG_RTC_DATETIME are selected (and CONFIG_RTC_HIRES is not).
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*
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* NOTE: Some date/time RTC hardware is capability of sub-second accuracy.
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* That sub-second accuracy is lost in this interface. However, since the
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* system time is reinitialized on each power-up/reset, there will be no
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* timing inaccuracy in the long run.
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*
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* Input Parameters:
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* tp - The location to return the high resolution time value.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno on failure
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*
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****************************************************************************/
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int up_rtc_getdatetime(FAR struct tm *tp)
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{
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struct i2c_msg_s msg[4];
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uint8_t secaddr;
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uint8_t buffer[7];
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uint8_t seconds;
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int ret;
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/* If this function is called before the RTC has been initialized (and it
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* will be), then just return the data/time of the epoch, 12:00 am, Jan 1,
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* 1970.
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*/
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if (!g_rtc_enabled)
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{
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tp->tm_sec = 0;
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tp->tm_min = 0;
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tp->tm_hour = 0;
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/* Jan 1, 1970 was a Thursday */
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tp->tm_wday = 4;
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tp->tm_mday = 1;
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tp->tm_mon = 0;
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tp->tm_year = 70;
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return -EAGAIN;
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}
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/* The start address of the read is the seconds address (0x00)
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* The chip increments the address to read from after each read.
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*/
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secaddr = MCP794XX_REG_RTCSEC;
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msg[0].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[0].addr = g_mcp794xx.addr;
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msg[0].flags = I2C_M_NOSTOP;
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msg[0].buffer = &secaddr;
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msg[0].length = 1;
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/* Setup the read. Seven (7) registers will be read.
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* (Seconds, minutes, hours, wday, date, month and year)
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*/
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msg[1].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[1].addr = g_mcp794xx.addr;
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msg[1].flags = I2C_M_READ;
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msg[1].buffer = buffer;
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msg[1].length = 7;
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/* Read the seconds register again */
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msg[2].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[2].addr = g_mcp794xx.addr;
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msg[2].flags = I2C_M_NOSTOP;
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msg[2].buffer = &secaddr;
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msg[2].length = 1;
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msg[3].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[3].addr = g_mcp794xx.addr;
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msg[3].flags = I2C_M_READ;
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msg[3].buffer = &seconds;
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msg[3].length = 1;
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/* Perform the transfer. The transfer may be performed repeatedly of the
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* seconds values decreases, meaning that was a rollover in the seconds.
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*/
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do
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{
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ret = I2C_TRANSFER(g_mcp794xx.i2c, msg, 4);
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if (ret < 0)
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{
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rtcerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return ret;
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}
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}
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while ((buffer[0] & MCP794XX_RTCSEC_BCDMASK) >
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(seconds & MCP794XX_RTCSEC_BCDMASK));
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/* Format the return time */
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/* Return seconds (0-59) */
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tp->tm_sec = rtc_bcd2bin(buffer[0] & MCP794XX_RTCSEC_BCDMASK);
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/* Return minutes (0-59) */
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tp->tm_min = rtc_bcd2bin(buffer[1] & MCP794XX_RTCMIN_BCDMASK);
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/* Return hour (0-23). This assumes 24-hour time was set. */
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tp->tm_hour = rtc_bcd2bin(buffer[2] & MCP794XX_RTCHOUR_BCDMASK);
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/* Return the day of the week (0-6) */
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tp->tm_wday = (rtc_bcd2bin(buffer[3]) & MCP794XX_RTCWKDAY_BCDMASK) - 1;
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/* Return the day of the month (1-31) */
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tp->tm_mday = rtc_bcd2bin(buffer[4] & MCP794XX_RTCDATE_BCDMASK);
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/* Return the month (0-11) */
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tp->tm_mon = rtc_bcd2bin(buffer[5] & MCP794XX_RTCMTH_BCDMASK) - 1;
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/* Return the years since 1900 */
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tp->tm_year = rtc_bcd2bin(buffer[6] & MCP794XX_RTCYEAR_BCDMASK);
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/* The Year is stored in the RTC starting from 2001. We need to convert it
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* to POSIX format that expects the year starting from 1900.
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*/
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tp->tm_year += 101;
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rtc_dumptime(tp, "Returning");
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return OK;
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}
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/****************************************************************************
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* Name: up_rtc_settime
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*
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* Description:
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* Set the RTC to the provided time. All RTC implementations must be able
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* to set their time based on a standard timespec.
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*
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* Input Parameters:
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* tp - the time to use
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno on failure
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*
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****************************************************************************/
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int up_rtc_settime(FAR const struct timespec *tp)
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{
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struct i2c_msg_s msg[3];
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struct tm newtm;
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time_t newtime;
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uint8_t buffer[8];
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uint8_t wkdayaddr;
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uint8_t wkday;
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int ret;
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int retries = MCP794XX_OSCRUN_READ_RETRY;
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/* If this function is called before the RTC has been initialized then
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* just return an error.
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*/
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if (!g_rtc_enabled)
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{
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return -EAGAIN;
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}
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rtcinfo("Setting time tp=(%d,%d)\n", (int)tp->tv_sec, (int)tp->tv_nsec);
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/* Get the broken out time */
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newtime = (time_t)tp->tv_sec;
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if (tp->tv_nsec >= 500000000)
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{
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/* Round up */
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newtime++;
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}
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if (localtime_r(&newtime, &newtm) == NULL)
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{
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rtcerr("ERROR: localtime_r failed\n");
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return -EINVAL;
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}
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rtc_dumptime(&newtm, "New time");
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/* Stop the oscillator first. */
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buffer[0] = MCP794XX_REG_RTCSEC;
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buffer[1] = 0;
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msg[0].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[0].addr = g_mcp794xx.addr;
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msg[0].flags = 0;
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msg[0].buffer = buffer;
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msg[0].length = 2;
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ret = I2C_TRANSFER(g_mcp794xx.i2c, msg, 1);
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if (ret < 0)
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{
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rtcerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return ret;
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}
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/* Verify that the oscillator is not running. */
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wkdayaddr = MCP794XX_REG_RTCWKDAY;
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msg[0].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[0].addr = g_mcp794xx.addr;
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msg[0].flags = I2C_M_NOSTOP;
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msg[0].buffer = &wkdayaddr;
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msg[0].length = 1;
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msg[1].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[1].addr = g_mcp794xx.addr;
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msg[1].flags = I2C_M_READ;
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msg[1].buffer = &wkday;
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msg[1].length = 1;
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retries = MCP794XX_OSCRUN_READ_RETRY;
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do
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{
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/* Give time to oscillator to change its status */
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nxsig_usleep(10000);
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ret = I2C_TRANSFER(g_mcp794xx.i2c, msg, 2);
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if (ret < 0)
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{
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rtcerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return ret;
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}
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retries--;
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}
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while ((wkday & MCP794XX_RTCWKDAY_OSCRUN) != 0 && retries > 0);
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/* Construct the message */
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/* Write starting with the seconds register */
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buffer[0] = MCP794XX_REG_RTCSEC;
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/* Save seconds (0-59) converted to BCD. And keep ST cleared. */
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buffer[1] = rtc_bin2bcd(newtm.tm_sec);
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/* Save minutes (0-59) converted to BCD */
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buffer[2] = rtc_bin2bcd(newtm.tm_min);
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/* Save hour (0-23) with 24-hour time indication */
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buffer[3] = rtc_bin2bcd(newtm.tm_hour);
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/* Save the day of the week (1-7) and enable VBAT. */
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buffer[4] = rtc_bin2bcd(newtm.tm_wday + 1) | MCP794XX_RTCWKDAY_VBATEN;
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/* Save the day of the month (1-31) */
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buffer[5] = rtc_bin2bcd(newtm.tm_mday);
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/* Save the month (1-12) */
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buffer[6] = rtc_bin2bcd(newtm.tm_mon + 1);
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/* Save the year (00-99) */
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/* First we need to convert "tm_year" to value starting from 2001.
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* The "tm_year" in POSIX is relative to 1900, so 2019 is 119,
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* so you just need to subtract 101: year = (1900 + value) - 2001
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*/
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buffer[7] = rtc_bin2bcd(newtm.tm_year - 101);
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msg[0].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[0].addr = g_mcp794xx.addr;
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msg[0].flags = 0;
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msg[0].buffer = buffer;
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msg[0].length = 8;
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ret = I2C_TRANSFER(g_mcp794xx.i2c, msg, 1);
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if (ret < 0)
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{
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rtcerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return ret;
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}
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/* Start the oscillator. */
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buffer[1] |= MCP794XX_RTCSEC_ST;
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msg[0].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
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msg[0].addr = g_mcp794xx.addr;
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msg[0].flags = 0;
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msg[0].buffer = buffer;
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msg[0].length = 2;
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ret = I2C_TRANSFER(g_mcp794xx.i2c, msg, 1);
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if (ret < 0)
|
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{
|
|
rtcerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Verify that the oscillator is running. */
|
|
|
|
wkdayaddr = MCP794XX_REG_RTCWKDAY;
|
|
|
|
msg[0].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
|
|
msg[0].addr = g_mcp794xx.addr;
|
|
msg[0].flags = I2C_M_NOSTOP;
|
|
msg[0].buffer = &wkdayaddr;
|
|
msg[0].length = 1;
|
|
|
|
msg[1].frequency = CONFIG_MCP794XX_I2C_FREQUENCY;
|
|
msg[1].addr = g_mcp794xx.addr;
|
|
msg[1].flags = I2C_M_READ;
|
|
msg[1].buffer = &wkday;
|
|
msg[1].length = 1;
|
|
|
|
retries = MCP794XX_OSCRUN_READ_RETRY;
|
|
|
|
do
|
|
{
|
|
/* Give time to oscillator to change its status */
|
|
|
|
nxsig_usleep(10000);
|
|
|
|
ret = I2C_TRANSFER(g_mcp794xx.i2c, msg, 2);
|
|
if (ret < 0)
|
|
{
|
|
rtcerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
retries--;
|
|
}
|
|
while ((wkday & MCP794XX_RTCWKDAY_OSCRUN) == 0 && retries > 0);
|
|
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_RTC_MCP794XX */
|