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https://github.com/espressif/esp-idf.git
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125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*
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* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "esp_macros.h"
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#include "esp_log.h"
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#include "esp_cpu.h"
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#include "soc/soc.h"
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#include "esp_attr.h"
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#include "hal/brownout_hal.h"
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#include "hal/brownout_ll.h"
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#include "esp_rom_sys.h"
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#include "esp_rom_uart.h"
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#include "sdkconfig.h"
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#include "esp_tee_intr.h"
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/*
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* NOTE: Brownout threshold levels
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*
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* +-----------------+-------------------+
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* | Threshold Level | Voltage (Approx.) |
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* +-----------------+-------------------+
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* | 7 | 2.51V |
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* | 6 | 2.64V |
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* | 5 | 2.76V |
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* | 4 | 2.92V |
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* | 3 | 3.10V |
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* | 2 | 3.27V |
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* +-----------------+-------------------+
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*/
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#if defined(CONFIG_ESP_BROWNOUT_DET_LVL)
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#define BROWNOUT_DET_LVL CONFIG_ESP_BROWNOUT_DET_LVL
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#else
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#define BROWNOUT_DET_LVL 0
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#endif
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static __attribute__((unused)) DRAM_ATTR const char *TAG = "BOD";
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#if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
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IRAM_ATTR static void rtc_brownout_isr_handler(void *arg)
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{
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/* Normally RTC ISR clears the interrupt flag after the application-supplied
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* handler returns. Since restart is called here, the flag needs to be
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* cleared manually.
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*/
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brownout_ll_intr_clear();
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// Stop the other core.
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#if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE
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const uint32_t core_id = esp_cpu_get_core_id();
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const uint32_t other_core_id = (core_id == 0) ? 1 : 0;
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esp_cpu_stall(other_core_id);
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#endif
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// TODO: Support for resetting the flash during brownout for stability
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ESP_DRAM_LOGI(TAG, "Brownout detector was triggered\r\n\r\n");
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// Flush any data left in UART FIFOs
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for (int i = 0; i < SOC_UART_HP_NUM; ++i) {
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if (uart_ll_is_enabled(i)) {
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esp_rom_output_tx_wait_idle(i);
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}
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}
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// generate core reset
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esp_rom_software_reset_system();
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ESP_INFINITE_LOOP();
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}
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#endif // CONFIG_ESP_SYSTEM_BROWNOUT_INTR
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void esp_tee_brownout_init(void)
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{
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#if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
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brownout_hal_config_t cfg = {
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.threshold = BROWNOUT_DET_LVL,
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.enabled = true,
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.reset_enabled = false,
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.flash_power_down = true,
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.rf_power_down = true,
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};
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brownout_hal_config(&cfg);
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brownout_ll_intr_clear();
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// TODO IDF-6606: LP_RTC_TIMER interrupt source is shared by lp_timer and brownout detector, but lp_timer interrupt
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// is not used now. An interrupt allocator is needed when lp_timer intr gets supported.
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struct vector_desc_t bod_vd = { 0, NULL, NULL, NULL };
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bod_vd.source = ETS_LP_RTC_TIMER_INTR_SOURCE;
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bod_vd.isr = rtc_brownout_isr_handler;
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esp_tee_intr_register((void *)&bod_vd);
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brownout_ll_intr_enable(true);
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#else // brownout without interrupt
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brownout_hal_config_t cfg = {
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.threshold = BROWNOUT_DET_LVL,
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.enabled = true,
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.reset_enabled = true,
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.flash_power_down = true,
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.rf_power_down = true,
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};
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brownout_hal_config(&cfg);
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#endif
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}
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void esp_tee_brownout_disable(void)
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{
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brownout_hal_config_t cfg = {
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.enabled = false,
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};
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brownout_hal_config(&cfg);
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#if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
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brownout_ll_intr_enable(false);
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#endif // CONFIG_ESP_SYSTEM_BROWNOUT_INTR
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}
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