xtensa/esp32-s2: Adds freerun timer wrapper
This commit is contained in:
Sara Souza
Gustavo Henrique Nihei
parent
f3477a86d2
commit
2cd4f4af79
@ -855,6 +855,13 @@ config ESP32S2_ONESHOT
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Enable a wrapper around the low level timer/counter functions to
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Enable a wrapper around the low level timer/counter functions to
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support one-shot timer.
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support one-shot timer.
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config ESP32S2_FREERUN
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bool "Freerun timer wrapper"
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default n
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---help---
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Enable a wrapper around the low level timer/counter functions to
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support freerun timer.
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endmenu # Timer/counter Configuration
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endmenu # Timer/counter Configuration
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endif # ESP32S2_TIMER
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endif # ESP32S2_TIMER
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@ -81,3 +81,7 @@ ifeq ($(CONFIG_TIMER),y)
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CHIP_CSRCS += esp32s2_tim_lowerhalf.c
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CHIP_CSRCS += esp32s2_tim_lowerhalf.c
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endif
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endif
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endif
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endif
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ifeq ($(CONFIG_ESP32S2_FREERUN),y)
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CHIP_CSRCS += esp32s2_freerun.c
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endif
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353
arch/xtensa/src/esp32s2/esp32s2_freerun.c
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353
arch/xtensa/src/esp32s2/esp32s2_freerun.c
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@ -0,0 +1,353 @@
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/****************************************************************************
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* arch/xtensa/src/esp32s2/esp32s2_freerun.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 <sys/types.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/clock.h>
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#include "esp32s2_freerun.h"
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#include "esp32s2_clockconfig.h"
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#include "esp32s2_gpio.h"
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#ifdef CONFIG_ESP32S2_FREERUN
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define MAX_TIMERS 4
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#define MAX_US_RESOLUTION 819 /* MAX_US = (PREmax * USEC_PER_SEC) / CLKmin */
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#define TIMER_WIDTH 64
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: esp32s2_freerun_handler
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*
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* Description:
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* Timer interrupt callback. When the freerun timer counter overflows,
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* this interrupt will occur. It will just increment an overflow counter.
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*
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* Input Parameters:
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* irq - IRQ associated to that interrupt.
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* arg - An opaque argument provided when the interrupt
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* was registered.
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*
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* Returned Value:
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* OK
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*
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****************************************************************************/
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#ifndef CONFIG_CLOCK_TIMEKEEPING
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static int esp32s2_freerun_handler(int irq, void *context, void *arg)
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{
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struct esp32s2_freerun_s *freerun = (struct esp32s2_freerun_s *) arg;
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DEBUGASSERT(freerun != NULL);
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freerun->overflow++;
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ESP32S2_TIM_SETALRM(freerun->tch, true); /* Re-enables the alarm */
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ESP32S2_TIM_ACKINT(freerun->tch); /* Clear the Interrupt */
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return OK;
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}
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#endif /* CONFIG_CLOCK_TIMEKEEPING */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: esp32s2_freerun_initialize
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*
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* Description:
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* Initialize the freerun timer wrapper.
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*
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* Input Parameters:
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* freerun - A pointer to an allocated instance of the freerun
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* state structure
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* chan - Timer counter channel to be used.
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* resolution - The required resolution of the timer in units of
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* microseconds. NOTE that the range is restricted to
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* the range of uint16_t (excluding zero).
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int esp32s2_freerun_initialize(struct esp32s2_freerun_s *freerun,
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int chan, uint16_t resolution)
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{
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uint16_t pre;
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int ret = OK;
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tmrinfo("chan=%d resolution=%d usecs\n", chan, resolution);
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DEBUGASSERT(freerun != NULL);
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DEBUGASSERT(chan >= 0);
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DEBUGASSERT(chan < MAX_TIMERS);
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DEBUGASSERT(resolution > 0);
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/* We can't have a resolution bigger than this.
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* The ESP32-C3 prescaler doesn't support.
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* max resolution = (max prescaler * USEC_PER_SEC) / esp32s2_clk_apb_freq()
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*/
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DEBUGASSERT(resolution <= MAX_US_RESOLUTION);
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freerun->tch = esp32s2_tim_init(chan);
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if (freerun->tch == NULL)
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{
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tmrerr("ERROR: Failed to allocate TIM %d\n", chan);
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ret = -EBUSY;
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}
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else
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{
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/* Initialize the remaining fields in the state structure. */
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freerun->chan = chan;
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freerun->resolution = resolution;
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freerun->max_timeout = (UINT64_C(1) << (TIMER_WIDTH - 1));
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/* Ensure timer is disabled.
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* Change the prescaler divider with the timer enabled can lead to
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* unpredictable results.
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*/
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ESP32S2_TIM_STOP(freerun->tch);
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/* Configure clock source */
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ESP32S2_TIM_CLK_SRC(freerun->tch, ESP32S2_TIM_APB_CLK);
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/* Calculate the suitable prescaler for a period
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* for the requested resolution.
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*/
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pre = esp_clk_apb_freq() * resolution / USEC_PER_SEC;
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tmrinfo("pre= %" PRIu16 " clk=%d \n", pre, esp_clk_apb_freq());
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/* Configure TIMER prescaler */
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ESP32S2_TIM_SETPRE(freerun->tch, pre);
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/* Configure TIMER mode */
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ESP32S2_TIM_SETMODE(freerun->tch, ESP32S2_TIM_MODE_UP);
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/* Clear TIMER counter value */
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ESP32S2_TIM_CLEAR(freerun->tch);
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/* Set the maximum timeout */
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ESP32S2_TIM_SETALRVL(freerun->tch, freerun->max_timeout);
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#ifndef CONFIG_CLOCK_TIMEKEEPING
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/* Set the interrupt */
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freerun->overflow = 0;
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/* Enable autoreload */
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ESP32S2_TIM_SETARLD(freerun->tch, true);
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/* Enable TIMER alarm */
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ESP32S2_TIM_SETALRM(freerun->tch, true);
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/* Clear Interrupt Bits Status */
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ESP32S2_TIM_ACKINT(freerun->tch);
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/* Register the handler */
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{
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irqstate_t flags = enter_critical_section();
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ret = ESP32S2_TIM_SETISR(freerun->tch, esp32s2_freerun_handler,
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freerun);
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leave_critical_section(flags);
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}
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if (ret == OK)
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{
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ESP32S2_TIM_ENABLEINT(freerun->tch);
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}
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#endif
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/* Finally, start the TIMER */
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ESP32S2_TIM_START(freerun->tch);
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}
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return ret;
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}
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/****************************************************************************
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* Name: esp32s2_freerun_counter
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*
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* Description:
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* Read the counter register of the free-running timer.
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*
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* Input Parameters:
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* freerun - Caller allocated instance of the freerun state
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* structure. This structure must have been previously
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* initialized via a call to
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* esp32s2_freerun_initialize();
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* ts - The location in which to return the time from the
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* free-running timer.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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#ifndef CONFIG_CLOCK_TIMEKEEPING
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int esp32s2_freerun_counter(struct esp32s2_freerun_s *freerun,
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struct timespec *ts)
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{
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uint64_t usec;
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uint64_t counter;
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uint64_t verify;
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uint32_t overflow;
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uint32_t sec;
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int pending;
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irqstate_t flags;
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DEBUGASSERT(freerun != NULL);
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DEBUGASSERT(ts != NULL);
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/* Temporarily disable the overflow counter. */
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flags = enter_critical_section();
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overflow = freerun->overflow;
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ESP32S2_TIM_GETCTR(freerun->tch, &counter);
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pending = ESP32S2_TIM_CHECKINT(freerun->tch);
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ESP32S2_TIM_GETCTR(freerun->tch, &verify);
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/* If an interrupt was pending before we re-enabled interrupts,
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* then the overflow needs to be incremented.
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*/
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if (pending)
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{
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ESP32S2_TIM_ACKINT(freerun->tch);
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/* Increment the overflow count and use the value of the
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* guaranteed to be AFTER the overflow occurred.
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*/
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overflow++;
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counter = verify;
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/* Update freerun overflow counter. */
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freerun->overflow = overflow;
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}
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leave_critical_section(flags);
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tmrinfo("counter=%" PRIu64 " (%" PRIu64 ") overflow=%" PRIu32
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", pending=%i\n",
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counter, verify, overflow, pending);
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usec = (uint64_t)(((overflow * freerun->max_timeout) + counter)
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* freerun->resolution);
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/* And return the value of the timer */
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sec = (uint32_t)(usec / USEC_PER_SEC);
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ts->tv_sec = sec;
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ts->tv_nsec = (usec - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
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tmrinfo(" usec=%" PRIu64 " ts=(%lu, %lu)\n",
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usec, (unsigned long)ts->tv_sec, (unsigned long)ts->tv_nsec);
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return OK;
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}
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#endif /* CONFIG_CLOCK_TIMEKEEPING */
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/****************************************************************************
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* Name: esp32s2_freerun_uninitialize
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*
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* Description:
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* Stop the free-running timer and release all resources that it uses.
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*
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* Input Parameters:
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* freerun - Caller allocated instance of the freerun state
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* structure. This structure must have been previously
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* initialized via a call to
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* esp32s2_freerun_initialize();
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int esp32s2_freerun_uninitialize(struct esp32s2_freerun_s *freerun)
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{
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int ret;
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DEBUGASSERT(freerun != NULL);
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DEBUGASSERT(freerun->tch != NULL);
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/* Stop timer */
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ESP32S2_TIM_STOP(freerun->tch);
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/* Disable timer interrupt */
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ESP32S2_TIM_DISABLEINT(freerun->tch);
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/* Detach handler */
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ret = ESP32S2_TIM_SETISR(freerun->tch, NULL, NULL);
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/* Free the timer */
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esp32s2_tim_deinit(freerun->tch);
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freerun->tch = NULL;
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return ret;
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}
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#endif /* CONFIG_ESP32S2_FREERUN */
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145
arch/xtensa/src/esp32s2/esp32s2_freerun.h
Normal file
145
arch/xtensa/src/esp32s2/esp32s2_freerun.h
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/****************************************************************************
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* arch/xtensa/src/esp32s2/esp32s2_freerun.h
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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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#ifndef __ARCH_XTENSA_SRC_ESP32S2_FREERUN_H
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#define __ARCH_XTENSA_SRC_ESP32S2_FREERUN_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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||||||
|
|
||||||
|
#include <nuttx/config.h>
|
||||||
|
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <time.h>
|
||||||
|
|
||||||
|
#include "esp32s2_tim.h"
|
||||||
|
|
||||||
|
#ifdef CONFIG_ESP32S2_FREERUN
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Types
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/* The freerun client must allocate an instance of this structure and called
|
||||||
|
* esp32s2_freerun_initialize() before using the freerun facilities. The
|
||||||
|
* client should not access the contents of this structure directly since
|
||||||
|
* the contents are subject to change.
|
||||||
|
*/
|
||||||
|
|
||||||
|
struct esp32s2_freerun_s
|
||||||
|
{
|
||||||
|
uint8_t chan; /* The timer/counter in use */
|
||||||
|
uint32_t overflow; /* Timer counter overflow */
|
||||||
|
uint16_t resolution; /* Timer resolution */
|
||||||
|
uint64_t max_timeout; /* Maximum timeout to overflow */
|
||||||
|
struct esp32s2_tim_dev_s *tch; /* Handle returned by esp32s2_tim_init() */
|
||||||
|
};
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Data
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#undef EXTERN
|
||||||
|
#if defined(__cplusplus)
|
||||||
|
#define EXTERN extern "C"
|
||||||
|
extern "C"
|
||||||
|
{
|
||||||
|
#else
|
||||||
|
#define EXTERN extern
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Function Prototypes
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: esp32s2_freerun_initialize
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Initialize the freerun timer wrapper.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* freerun - Caller allocated instance of the freerun
|
||||||
|
* state structure
|
||||||
|
* chan - Timer counter channel to be used.
|
||||||
|
* resolution - The required resolution of the timer in units of
|
||||||
|
* microseconds. NOTE that the range is restricted to
|
||||||
|
* the range of uint16_t (excluding zero).
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Zero (OK) is returned on success; a negated errno value is returned
|
||||||
|
* on failure.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
int esp32s2_freerun_initialize(struct esp32s2_freerun_s *freerun,
|
||||||
|
int chan, uint16_t resolution);
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: esp32s2_freerun_counter
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Read the counter register of the free-running timer.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* freerun - Caller allocated instance of the freerun state
|
||||||
|
* structure. This structure must have been previously
|
||||||
|
* initialized via a call to
|
||||||
|
* esp32s2_freerun_initialize();
|
||||||
|
* ts - The location in which to return the time from the
|
||||||
|
* free-running timer.
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Zero (OK) is returned on success; a negated errno value is returned
|
||||||
|
* on failure.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
int esp32s2_freerun_counter(struct esp32s2_freerun_s *freerun,
|
||||||
|
struct timespec *ts);
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: esp32s2_freerun_uninitialize
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Stop the free-running timer and release all resources that it uses.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* freerun - Caller allocated instance of the freerun state
|
||||||
|
* structure. This structure must have been previously
|
||||||
|
* initialized via a call to
|
||||||
|
* esp32s2_freerun_initialize();
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Zero (OK) is returned on success; a negated errno value is returned
|
||||||
|
* on failure.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
int esp32s2_freerun_uninitialize(struct esp32s2_freerun_s *freerun);
|
||||||
|
|
||||||
|
#undef EXTERN
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif /* CONFIG_ESP32S2_FREERUN */
|
||||||
|
#endif /* __ARCH_XTENSA_SRC_ESP32S2_FREERUN_H */
|
||||||
Loading…
Reference in New Issue
Block a user