Merge branch 'feature/esp32s2_brownout' into 'master'

esp32s2: add brownout detector support

Closes IDF-751

See merge request espressif/esp-idf!7428

components/esp32/CMakeLists.txt

@@ -12,7 +12,6 @@ if(BOOTLOADER_BUILD)
 else()
     # Regular app build
     set(srcs 
-        "brownout.c"
         "cache_err_int.c"
         "cache_sram_mmu.c"
         "clk.c"

components/esp32/brownout.c

@@ -1,62 +0,0 @@
-// 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 "soc/soc.h"
-#include "soc/cpu.h"
-#include "soc/rtc_periph.h"
-#include "esp32/rom/ets_sys.h"
-#include "esp_private/system_internal.h"
-#include "driver/rtc_cntl.h"
-#include "freertos/FreeRTOS.h"
-
-#ifdef CONFIG_ESP32_BROWNOUT_DET_LVL
-#define BROWNOUT_DET_LVL CONFIG_ESP32_BROWNOUT_DET_LVL
-#else
-#define BROWNOUT_DET_LVL 0
-#endif //CONFIG_ESP32_BROWNOUT_DET_LVL
-
-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.
-     */
-    REG_WRITE(RTC_CNTL_INT_CLR_REG, RTC_CNTL_BROWN_OUT_INT_CLR);
-    /* 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)
-{
-    REG_WRITE(RTC_CNTL_BROWN_OUT_REG,
-            RTC_CNTL_BROWN_OUT_ENA /* Enable BOD */
-            | RTC_CNTL_BROWN_OUT_PD_RF_ENA /* Automatically power down RF */
-            /* Reset timeout must be set to >1 even if BOR feature is not used */
-            | (2 << RTC_CNTL_BROWN_OUT_RST_WAIT_S)
-            | (BROWNOUT_DET_LVL << RTC_CNTL_DBROWN_OUT_THRES_S));
-
-    ESP_ERROR_CHECK( rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M) );
-
-    REG_SET_BIT(RTC_CNTL_INT_ENA_REG, RTC_CNTL_BROWN_OUT_INT_ENA_M);
-}