esp32, esp32s2beta: move brownout.c to esp_common

components/esp_common/src/brownout.c

@@ -0,0 +1,75 @@
+// Copyright 2015-2017 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 <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "sdkconfig.h"
+#include "esp_log.h"
+#include "soc/soc.h"
+#include "soc/cpu.h"
+#include "soc/rtc_periph.h"
+#include "hal/brownout_hal.h"
+#include "esp_private/system_internal.h"
+#include "driver/rtc_cntl.h"
+#include "freertos/FreeRTOS.h"
+
+#if defined(CONFIG_ESP32_BROWNOUT_DET_LVL)
+#define BROWNOUT_DET_LVL CONFIG_ESP32_BROWNOUT_DET_LVL
+#elif defined(CONFIG_ESP32S2_BROWNOUT_DET_LVL)
+#define BROWNOUT_DET_LVL CONFIG_ESP32S2_BROWNOUT_DET_LVL
+#else
+#define BROWNOUT_DET_LVL 0
+#endif
+
+#ifdef SOC_BROWNOUT_RESET_SUPPORTED
+#define BROWNOUT_RESET_EN true
+#else
+#define BROWNOUT_RESET_EN false
+#endif // SOC_BROWNOUT_RESET_SUPPORTED
+
+
+static void rtc_brownout_isr_handler(void *arg)
+{
+    /* Normally RTC ISR clears the interrupt flag after the application-supplied
+     * handler returns. Since restart is called here, the flag needs to be
+     * cleared manually.
+     */
+    brownout_hal_intr_clear();
+    /* Stall the other CPU to make sure the code running there doesn't use UART
+     * at the same time as the following ets_printf.
+     */
+    esp_cpu_stall(!xPortGetCoreID());
+    esp_reset_reason_set_hint(ESP_RST_BROWNOUT);
+    ets_printf("\r\nBrownout detector was triggered\r\n\r\n");
+    esp_restart_noos();
+}
+
+void esp_brownout_init(void)
+{
+    brownout_hal_config_t cfg = {
+        .threshold = BROWNOUT_DET_LVL,
+        .enabled = true,
+        .reset_enabled = BROWNOUT_RESET_EN,
+        .flash_power_down = true,
+        .rf_power_down = true,
+    };
+
+    brownout_hal_config(&cfg);
+
+    ESP_ERROR_CHECK( rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M) );
+
+    brownout_hal_intr_enable(true);
+}