| /* |
| * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| #include <zephyr/kernel.h> |
| #include <zephyr/pm/pm.h> |
| #include <zephyr/pm/device.h> |
| #include <zephyr/pm/policy.h> |
| #include <zephyr/drivers/gpio.h> |
| #include "esp_sleep.h" |
| |
| /* Most development boards have "boot" button attached to GPIO0. |
| * You can also change this to another pin. |
| */ |
| #define SW0_NODE DT_ALIAS(sw0) |
| |
| #if !DT_NODE_HAS_STATUS(SW0_NODE, okay) |
| #error "unsupported board: sw0 devicetree alias is not defined" |
| #endif |
| |
| /* Add an extra delay when sleeping to make sure that light sleep |
| * is chosen. |
| */ |
| #define LIGHT_SLP_EXTRA_DELAY (50UL) |
| |
| static const struct gpio_dt_spec button = |
| GPIO_DT_SPEC_GET_OR(SW0_NODE, gpios, {0}); |
| |
| void main(void) |
| { |
| if (!device_is_ready(button.port)) { |
| printk("Error: button device %s is not ready\n", button.port->name); |
| return; |
| } |
| |
| const int wakeup_level = (button.dt_flags & GPIO_ACTIVE_LOW) ? 0 : 1; |
| |
| esp_gpio_wakeup_enable(button.pin, |
| 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 (gpio_pin_get_dt(&button) == wakeup_level) { |
| printk("Waiting for GPIO%d to go high...\n", button.pin); |
| do { |
| k_busy_wait(10000); |
| } while (gpio_pin_get_dt(&button) == wakeup_level); |
| } |
| |
| printk("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 |
| */ |
| k_busy_wait(10000); |
| |
| /* Get timestamp before entering sleep */ |
| int64_t t_before_ms = k_uptime_get(); |
| |
| /* Sleep triggers the idle thread, which makes the pm subsystem select some |
| * pre-defined power state. Light sleep is used here because there is enough |
| * time to consider it, energy-wise, worthy. |
| */ |
| k_sleep(K_USEC(DT_PROP(DT_NODELABEL(light_sleep), min_residency_us) + |
| LIGHT_SLP_EXTRA_DELAY)); |
| /* Execution continues here after wakeup */ |
| |
| /* Get timestamp after waking up from sleep */ |
| int64_t t_after_ms = k_uptime_get(); |
| |
| /* 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; |
| } |
| |
| printk("Returned from light sleep, reason: %s, t=%lld ms, slept for %lld ms\n", |
| wakeup_reason, t_after_ms, (t_after_ms - t_before_ms)); |
| } |
| |
| } |