Retain GPIO (not RTC) in deepsleep and in wake stub
Posted: Tue May 21, 2019 11:09 am
Hi Everybody,
I need to retain a GPIO which is not in RTC controller (in my case GPIO22) in deepsleep. Below it is a simple test:
-application setup GPIO22 as output and it is turned on.
-a wake-up timer of 5 seconds is setup
-esp32 is put in deep_sleep
-a wake stub is provided to setup GPIO22 as ouput and turn on the pin
Everything works as expected but if I use an oscilloscope I can see a glitch on the pin of about 320us which I think it is between the device exit deepsleep and the wakeup stub.
How to solve this?
Should I use an RTC pin?
Thanks
I need to retain a GPIO which is not in RTC controller (in my case GPIO22) in deepsleep. Below it is a simple test:
-application setup GPIO22 as output and it is turned on.
-a wake-up timer of 5 seconds is setup
-esp32 is put in deep_sleep
-a wake stub is provided to setup GPIO22 as ouput and turn on the pin
Code: Select all
#include <stdio.h>
#include <string.h>
#include "esp_sleep.h"
#include "esp_attr.h"
#include "rom/rtc.h"
#include "rom/ets_sys.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
static const char RTC_RODATA_ATTR wake_str[] = "wake\n";
static void RTC_IRAM_ATTR wake_stub()
{
REG_WRITE(GPIO_ENABLE_REG, BIT22);
REG_WRITE(GPIO_OUT_W1TS_REG, BIT22);//GPIO22 HIGH (set)
// print wake
ets_printf(wake_str);
esp_default_wake_deep_sleep();
// Return from the wake stub function to continue
// booting the firmware.
return;
}
void app_main(void)
{
if (rtc_get_reset_reason(0) == DEEPSLEEP_RESET) {
printf("Wake up from deep sleep\n");
} else {
printf("Not a deep sleep wake up\n");
}
//Config gpio_num_22 as output
gpio_config_t config = {
.pin_bit_mask = BIT64(GPIO_NUM_22),
.mode = GPIO_MODE_OUTPUT,
.pull_up_en = GPIO_PULLUP_DISABLE,
.pull_down_en = GPIO_PULLDOWN_DISABLE
};
ESP_ERROR_CHECK(gpio_config(&config));
printf("set HIGH GPIO_NUM_22 and HOLD\n");
ESP_ERROR_CHECK(gpio_set_level(GPIO_NUM_22, 1));
gpio_deep_sleep_hold_en();
printf("Enable wakeUP in 5 seconds\n");
esp_sleep_enable_timer_wakeup(5000000);
// Set the wake stub function
esp_set_deep_sleep_wake_stub(&wake_stub);
// Enter deep sleep
esp_deep_sleep_start();
}How to solve this?
Should I use an RTC pin?
Thanks