esp-idf/components/driver/rtc_module.c

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// Copyright 2016-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed 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.
#include <stdlib.h>
#include <ctype.h>
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_log.h"
#include "soc/rtc_periph.h"
#include "soc/sens_periph.h"
#include "soc/syscon_periph.h"
#include "soc/rtc.h"
#include "soc/periph_defs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"
#include "esp_intr_alloc.h"
#include "sys/lock.h"
#include "driver/rtc_cntl.h"
#ifndef NDEBUG
// Enable built-in checks in queue.h in debug builds
#define INVARIANTS
#endif
#include "sys/queue.h"
portMUX_TYPE rtc_spinlock = portMUX_INITIALIZER_UNLOCKED;
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/*---------------------------------------------------------------
INTERRUPT HANDLER
---------------------------------------------------------------*/
typedef struct rtc_isr_handler_ {
uint32_t mask;
intr_handler_t handler;
void* handler_arg;
SLIST_ENTRY(rtc_isr_handler_) next;
} rtc_isr_handler_t;
static SLIST_HEAD(rtc_isr_handler_list_, rtc_isr_handler_) s_rtc_isr_handler_list =
SLIST_HEAD_INITIALIZER(s_rtc_isr_handler_list);
portMUX_TYPE s_rtc_isr_handler_list_lock = portMUX_INITIALIZER_UNLOCKED;
static intr_handle_t s_rtc_isr_handle;
static void rtc_isr(void* arg)
{
uint32_t status = REG_READ(RTC_CNTL_INT_ST_REG);
rtc_isr_handler_t* it;
portENTER_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
SLIST_FOREACH(it, &s_rtc_isr_handler_list, next) {
if (it->mask & status) {
portEXIT_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
(*it->handler)(it->handler_arg);
portENTER_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
}
}
portEXIT_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
REG_WRITE(RTC_CNTL_INT_CLR_REG, status);
}
static esp_err_t rtc_isr_ensure_installed(void)
{
esp_err_t err = ESP_OK;
portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);
if (s_rtc_isr_handle) {
goto out;
}
REG_WRITE(RTC_CNTL_INT_ENA_REG, 0);
REG_WRITE(RTC_CNTL_INT_CLR_REG, UINT32_MAX);
err = esp_intr_alloc(ETS_RTC_CORE_INTR_SOURCE, 0, &rtc_isr, NULL, &s_rtc_isr_handle);
if (err != ESP_OK) {
goto out;
}
out:
portEXIT_CRITICAL(&s_rtc_isr_handler_list_lock);
return err;
}
esp_err_t rtc_isr_register(intr_handler_t handler, void* handler_arg, uint32_t rtc_intr_mask)
{
esp_err_t err = rtc_isr_ensure_installed();
if (err != ESP_OK) {
return err;
}
rtc_isr_handler_t* item = malloc(sizeof(*item));
if (item == NULL) {
return ESP_ERR_NO_MEM;
}
item->handler = handler;
item->handler_arg = handler_arg;
item->mask = rtc_intr_mask;
portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);
SLIST_INSERT_HEAD(&s_rtc_isr_handler_list, item, next);
portEXIT_CRITICAL(&s_rtc_isr_handler_list_lock);
return ESP_OK;
}
esp_err_t rtc_isr_deregister(intr_handler_t handler, void* handler_arg)
{
rtc_isr_handler_t* it;
rtc_isr_handler_t* prev = NULL;
bool found = false;
portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);
SLIST_FOREACH(it, &s_rtc_isr_handler_list, next) {
if (it->handler == handler && it->handler_arg == handler_arg) {
if (it == SLIST_FIRST(&s_rtc_isr_handler_list)) {
SLIST_REMOVE_HEAD(&s_rtc_isr_handler_list, next);
} else {
SLIST_REMOVE_AFTER(prev, next);
}
found = true;
free(it);
break;
}
prev = it;
}
portEXIT_CRITICAL(&s_rtc_isr_handler_list_lock);
return found ? ESP_OK : ESP_ERR_INVALID_STATE;
}