DII
DevHeads IoT Integration Server•6mo ago
Dtynin

Need assistance implementing a low-power mode to extend battery life for the ATmega2560

Hi friends, I need assistance implementing a low-power mode to extend battery life for the ATmega2560 with Zephyr OS, and resolve the issue of failing to wake up from low-power mode? I have been able to configure low-power mode in Zephyr and set up a wake-up source via an external interrupt, yet I still encounter the issue of the microcontroller failing to wake up from low-power mode. Here's the code: 
#include <zephyr.h>
#include <device.h>
#include <drivers/gpio.h>
#include <power/power.h>
#include <logging/log.h>

LOG_MODULE_REGISTER(main);

#define WAKEUP_PIN DT_GPIO_PIN(DT_NODELABEL(gpio0), wakeup_pin)

void main(void)
{
    const struct device *gpio_dev = device_get_binding(DT_LABEL(DT_NODELABEL(gpio0)));

    gpio_pin_configure(gpio_dev, WAKEUP_PIN, GPIO_INPUT | GPIO_INT_EDGE_TO_ACTIVE);
    gpio_pin_interrupt_configure(gpio_dev, WAKEUP_PIN, GPIO_INT_EDGE_TO_ACTIVE);

    while (1) {
        k_sleep(K_SECONDS(10));
        sys_pm_force_power_state(SYS_POWER_STATE_DEEP_SLEEP_1);
    }
}
#include <zephyr.h>
#include <device.h>
#include <drivers/gpio.h>
#include <power/power.h>
#include <logging/log.h>

LOG_MODULE_REGISTER(main);

#define WAKEUP_PIN DT_GPIO_PIN(DT_NODELABEL(gpio0), wakeup_pin)

void main(void)
{
    const struct device *gpio_dev = device_get_binding(DT_LABEL(DT_NODELABEL(gpio0)));

    gpio_pin_configure(gpio_dev, WAKEUP_PIN, GPIO_INPUT | GPIO_INT_EDGE_TO_ACTIVE);
    gpio_pin_interrupt_configure(gpio_dev, WAKEUP_PIN, GPIO_INT_EDGE_TO_ACTIVE);

    while (1) {
        k_sleep(K_SECONDS(10));
        sys_pm_force_power_state(SYS_POWER_STATE_DEEP_SLEEP_1);
    }
}
If the implementation is successful, the microcontroller should wake up from low power mode when an external interrupt is triggered, and log messages before and after sleep to indicate proper functioning.
Solution:
you can try the following steps: 1. Ensure Proper Interrupt Configuration: - Verify the interrupt is mapped to the correct pin and edge. ...
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Solution
Joseph Ogbonna
Joseph Ogbonna•5mo ago
you can try the following steps: 1. Ensure Proper Interrupt Configuration: - Verify the interrupt is mapped to the correct pin and edge. 2. Enable Wake-Up Source: - Confirm that the wake-up source (e.g., the GPIO pin interrupt) is correctly enabled before entering sleep mode. 3. Move sys_pm_force_power_state() Inside a Loop: - Place the sys_pm_force_power_state() function in a loop to continually check for wake-up events. Here's the updated code: 
   while (1) {
       k_sleep(K_SECONDS(10));

       // Configure the power state to deep sleep
       sys_pm_force_power_state(SYS_POWER_STATE_DEEP_SLEEP_1);

       // Wait for interrupt
       k_cpu_idle();
   }
   
   while (1) {
       k_sleep(K_SECONDS(10));

       // Configure the power state to deep sleep
       sys_pm_force_power_state(SYS_POWER_STATE_DEEP_SLEEP_1);

       // Wait for interrupt
       k_cpu_idle();
   }
4. Verify the External Circuit: - Ensure that the external circuit generating the interrupt is functioning correctly and pulling the wake-up pin to the correct logic level during sleep.

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