esp-idf/components/esp_system/system_api.c

#include "esp_system.h"
#include "esp_private/system_internal.h"
#include "esp_heap_caps.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

#if CONFIG_IDF_TARGET_ESP32S2
#include "soc/rtc.h"
#include "soc/rtc_cntl_reg.h"
#include "esp32s2/rom/uart.h"
#include "esp32s2/memprot.h"
#endif

#include "esp_system.h"
#include "panic_internal.h"

#define SHUTDOWN_HANDLERS_NO 2
static shutdown_handler_t shutdown_handlers[SHUTDOWN_HANDLERS_NO];

esp_err_t esp_register_shutdown_handler(shutdown_handler_t handler)
{
    for (int i = 0; i < SHUTDOWN_HANDLERS_NO; i++) {
        if (shutdown_handlers[i] == handler) {
            return ESP_ERR_INVALID_STATE;
        } else if (shutdown_handlers[i] == NULL) {
            shutdown_handlers[i] = handler;
            return ESP_OK;
        }
    }
    return ESP_ERR_NO_MEM;
}

esp_err_t esp_unregister_shutdown_handler(shutdown_handler_t handler)
{
    for (int i = 0; i < SHUTDOWN_HANDLERS_NO; i++) {
        if (shutdown_handlers[i] == handler) {
            shutdown_handlers[i] = NULL;
            return ESP_OK;
        }
    }
    return ESP_ERR_INVALID_STATE;
}

#if CONFIG_IDF_TARGET_ESP32S2
static __attribute__((noreturn)) void esp_digital_reset(void)
{
    // make sure all the panic handler output is sent from UART FIFO
    uart_tx_wait_idle(CONFIG_ESP_CONSOLE_UART_NUM);
    // switch to XTAL (otherwise we will keep running from the PLL)

    rtc_clk_cpu_freq_set_xtal();

    // reset the digital part
    SET_PERI_REG_MASK(RTC_CNTL_OPTIONS0_REG, RTC_CNTL_SW_SYS_RST);
    while (true) {
        ;
    }
}
#endif

void IRAM_ATTR esp_restart(void)
{
    for (int i = SHUTDOWN_HANDLERS_NO - 1; i >= 0; i--) {
        if (shutdown_handlers[i]) {
            shutdown_handlers[i]();
        }
    }

    // Disable scheduler on this core.
    vTaskSuspendAll();

#if CONFIG_IDF_TARGET_ESP32S2
    if ( esp_memprot_is_intr_ena_any() || esp_memprot_is_locked_any()) {
        esp_digital_reset();
    }
#endif
    esp_restart_noos();
}

uint32_t esp_get_free_heap_size( void )
{
    return heap_caps_get_free_size( MALLOC_CAP_DEFAULT );
}

uint32_t esp_get_minimum_free_heap_size( void )
{
    return heap_caps_get_minimum_free_size( MALLOC_CAP_DEFAULT );
}

const char *esp_get_idf_version(void)
{
    return IDF_VER;
}

void __attribute__((noreturn)) esp_system_abort(const char *details)
{
    panic_abort(details);
}