Current consumption in nrf52833, sdk version 2.9.0 , not able to use : pm_state_force(0u, &(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0});

Hello,

Can you try these configs 

CONFIG_PM_DEVICE=y
CONFIG_GPIO=y
CONFIG_CRC=y
CONFIG_POWEROFF=y
CONFIG_HWINFO=y

in your pr.con file?

Hello Kazi,

I tried these configs. But Im getting the same error. Also, some reference to this case showed me that the function -pm_state_force(0, &(struct pm_state_info){.state = PM_STATE_SOFT_OFF,.substate_id = 0});      is not supported in versions after v2.5.0. If so, then how must I achieve a normal sleep and a deep sleep condition in nrf52833 ?

Hello,

''I tried these configs. But Im getting the same error. Also, some reference to this case showed me that the function -pm_state_force(0, &(struct pm_state_info){.state = PM_STATE_SOFT_OFF,.substate_id = 0});  You are correct. pm_state_force() fucntion and CONFIG_PM are not supported on latest NCS version after v2.5.0. The error "undefined reference to pm_state_force" and the inability to set CONFIG_PM=y are due to changes in Zephyr and NCS.

For system On idle, you do not need to call any special function for the CPU to enter sleep; simply using k_msleep() is sufficient for normal low-power operation in System ON mode. The system will wake up on any interrupt (timer, GPIO, etc.)

For example:

#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/printk.h>

#define SLEEP_TIME_MS	1
#define SW0_NODE DT_ALIAS(sw0)

static const struct gpio_dt_spec button = GPIO_DT_SPEC_GET(SW0_NODE, gpios);
static struct gpio_callback button_cb_data;

void button_pressed(const struct device *dev, struct gpio_callback *cb, uint32_t pins)
{
    printk("Button pressed! System woke up from sleep.\n");
}

void main(void)
{
    int ret;

    if (!gpio_is_ready_dt(&button)) {
        return;
    }

    ret = gpio_pin_configure_dt(&button, GPIO_INPUT | GPIO_PULL_UP);
    if (ret < 0) {
        return;
    }

    ret = gpio_pin_interrupt_configure_dt(&button, GPIO_INT_EDGE_TO_ACTIVE);
    if (ret < 0) {
        return;
    }
/*/*These lines are used to register a callback function (button_pressed) that will be called
	 when a GPIO interrupt occurs on the specified pin. This means that when the button is 
	 pressed (or released, depending on your interrupt configuration), 
	 the button_pressed function will be executed*/
	 
    gpio_init_callback(&button_cb_data, button_pressed, BIT(button.pin));
    gpio_add_callback(button.port, &button_cb_data);

    printk("System will sleep. Press the button to wake up.\n");

    while (1) {
        k_msleep(1000); // System will enter idle if nothing else is running
    }
}

• For system off, you need to use sys_poweroff() function to enter System OFF mode (deepest sleep).

  • Before calling sys_poweroff(), configure your wakeup sources (e.g., set up a GPIO pin with sense for wakeup).
  • After entering System OFF, the device can only be woken up by a reset or a configured wakeup source.

  // Configure wakeup pin (example for a button)
  nrf_gpio_cfg_input(WAKEUP_PIN, NRF_GPIO_PIN_PULLUP);
  nrf_gpio_cfg_sense_set(WAKEUP_PIN, NRF_GPIO_PIN_SENSE_LOW);
  
  // Enter System OFF
  sys_poweroff();

Hello,

Thankyou very much, I also wanted to know about how to use RTC for sys_poweroff(); , as our custom board does not have a gpio switch for interrupt. We will have to move forward with RTC generated wakeup.

So, I went through the system_off sample code, where i tried to use the function :