Device Runtime Power Management nrf5340

[Macherla Swetha]

#include <zephyr/kernel.h>

#include <zephyr/device.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/usb/usb_device.h>
#include <zephyr/usb/usbd.h>
#include<stdio.h>

volatile uint8_t g_u8_onesec_timer_interrupt;

LOG_MODULE_REGISTER(UART, CONFIG_LOG_DEFAULT_LEVEL);
const struct device *const uart_dev = DEVICE_DT_GET_ONE(zephyr_cdc_acm_uart);

void config_uart(void)
{
    int ret;
    if (!device_is_ready(uart_dev))
    {
        LOG_ERR("CDC ACM device not ready");
    }

    ret = usb_enable(NULL);
    if (ret != 0)
    {
        LOG_ERR("Failed to enable USB");
    }
}


void uart_enable(void)
{
    uart_irq_rx_enable(uart_dev);
    uart_irq_tx_enable(uart_dev);
}

void uart_disable(void)
{
    uart_irq_tx_disable(uart_dev);
    uart_irq_rx_disable(uart_dev);
}


///////////////////////////////// 


// Add function prototypes at the top before K_WORK_DEFINE()
static void my_work_sys_app_handler(struct k_work *work);


// Define the work items properly
K_WORK_DEFINE(my_work_sys_app, my_work_sys_app_handler);


// Define the timers
struct k_timer my_sys_app_timer;


// Function prototypes for expiry handlers
static void my_sys_app_timer_expiry_function(struct k_timer *timer_id);


// Initialize the timers with the correct expiry functions
K_TIMER_DEFINE(my_sys_app_timer, my_sys_app_timer_expiry_function, NULL);


// Work queue handler for system application timer
void my_work_sys_app_handler(struct k_work *work)
{
    g_u8_onesec_timer_interrupt = 1;
}


// Timer expiry function for system application timer
void my_sys_app_timer_expiry_function(struct k_timer *my_sys_app_timer)
{
    k_work_submit(&my_work_sys_app);
}


// Function to start the system application timer
void sys_app_start_timer(uint32_t u32_interval)
{
    k_timer_start(&my_sys_app_timer, K_MSEC(u32_interval), K_MSEC(u32_interval));
}


// Function to stop the system application timer
void stop_sys_app_timer(void)
{
    k_timer_stop(&my_sys_app_timer);
}


///////////////////////////////////////////////////////////


int main(void)
{
        config_uart();
        sys_app_start_timer(1000);
        while(1)
        {
                printf("hello nRF...\n");
                if(g_u8_onesec_timer_interrupt)
                {
                    g_u8_onesec_timer_interrupt = 0;  
                    uart_enable();  
                }
        }

        uart_disable();
        k_cpu_idle();
}


//////////////////prj.conf//////////////////////////////
CONFIG_CONSOLE=y                        
CONFIG_STDOUT_CONSOLE=y                 
CONFIG_PRINTK=y
CONFIG_SERIAL=y
CONFIG_UART_CONSOLE=y
CONFIG_UART_LINE_CTRL=y

CONFIG_USB_DEVICE_STACK=y
CONFIG_USB_DEVICE_PRODUCT="Zephyr USB console sample"
CONFIG_USB_DEVICE_PID=0x0004


CONFIG_USB_DEVICE_STACK=y             
CONFIG_USB_CDC_ACM=y                   
CONFIG_SERIAL=y  

CONFIG_PM_DEVICE=y                       
CONFIG_PM_DEVICE_RUNTIME=y

even thuogh i am using k_cpu_idle why wake_count = 50?  ... is their any methods to keep the device in idle when it is idle..... 

[JONATHAN LL]

is their any methods to keep the device in idle when it is idle...

Not sure what you want here, can you try and explain in detail what you are trying to do and what potentially is the source of your confusion ?


Wat NSC version are you using and and what samples have you used? 

Regards,
Jonathan

[Macherla Swetha]

I am trying to implementing Low power modes... nRF5340, with ncs version 3.1.0

[JONATHAN LL]

Have a read of this blog https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/optimizing-power-on-nrf53-designs#mcetoc_1fdsj2ncl1 Its a bit outdated but same principles apply. 

If you want the best power saving then consider using system off when possible. https://docs.zephyrproject.org/latest/samples/boards/nordic/system_off/README.html , https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/boards/nordic/system_off .

Disable any peripherals that are not in use, lower output power on the radio if possible. 

Regards,
Jonathan

[Macherla Swetha]

I read those blogs, and I don’t want to use system off. I want to reduce power consumption in run mode. My application runs every 1 second, but it takes only 200 ms to execute. For the remaining 800 ms, I want the system to stay in sleep mode. When an interrupt occurs, the system should wake up.

is their any methods to implement low power modes?

when i enable CONFIG_PM=y -----> it gets "n" only.

[Macherla Swetha]

 CONFIG_PM is no longer used by Nordic... i got it .

but how to reduce power consumption other than this?