void app_main()
{
esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause();
if (cause != ESP_SLEEP_WAKEUP_ULP) {
printf("Not ULP wakeup\n");
init_ulp_program();
} else {
printf("Deep sleep wakeup\n");
printf("ULP did %d measurements since last reset\n", ulp_sample_counter & UINT16_MAX);
printf("Thresholds: low=%d high=%d\n", ulp_low_thr, ulp_high_thr);
ulp_last_result &= UINT16_MAX;
printf("Value=%d was %s threshold\n", ulp_last_result,
ulp_last_result < ulp_low_thr ? "below" : "above");
}
printf("Entering deep sleep\n\n");
start_ulp_program();
ESP_ERROR_CHECK( esp_sleep_enable_ulp_wakeup() );
esp_deep_sleep_start();
}
void app_main()
{
/* Configure the button GPIO as input, enable wakeup */
const int button_gpio_num = BUTTON_GPIO_NUM_DEFAULT;
const int wakeup_level = BUTTON_WAKEUP_LEVEL_DEFAULT;
gpio_config_t config = {
.pin_bit_mask = BIT64(button_gpio_num),
.mode = GPIO_MODE_INPUT
};
ESP_ERROR_CHECK(gpio_config(&config));
gpio_wakeup_enable(button_gpio_num,
wakeup_level == 0 ? GPIO_INTR_LOW_LEVEL : GPIO_INTR_HIGH_LEVEL);
while (true) {
/* Wake up in 2 seconds, or when button is pressed */
esp_sleep_enable_timer_wakeup(2000000);
esp_sleep_enable_gpio_wakeup();
/* Wait until GPIO goes high */
if (rtc_gpio_get_level(button_gpio_num) == wakeup_level) {
printf("Waiting for GPIO%d to go high...\n", button_gpio_num);
do {
vTaskDelay(pdMS_TO_TICKS(10));
} while (rtc_gpio_get_level(button_gpio_num) == wakeup_level);
}
printf("Entering light sleep\n");
/* To make sure the complete line is printed before entering sleep mode,
* need to wait until UART TX FIFO is empty:
*/
uart_tx_wait_idle(CONFIG_CONSOLE_UART_NUM);
/* Get timestamp before entering sleep */
int64_t t_before_us = esp_timer_get_time();
/* Enter sleep mode */
esp_light_sleep_start();
/* Execution continues here after wakeup */
/* Get timestamp after waking up from sleep */
int64_t t_after_us = esp_timer_get_time();
/* Determine wake up reason */
const char* wakeup_reason;
switch (esp_sleep_get_wakeup_cause()) {
case ESP_SLEEP_WAKEUP_TIMER:
wakeup_reason = "timer";
break;
case ESP_SLEEP_WAKEUP_GPIO:
wakeup_reason = "pin";
break;
default:
wakeup_reason = "other";
break;
}
printf("Returned from light sleep, reason: %s, t=%lld ms, slept for %lld ms\n",
wakeup_reason, t_after_us / 1000, (t_after_us - t_before_us) / 1000);
}
}
