NCS Uart Console Suspend Before Log Outpput

[kyozc]

Hi Nordic:

Test with board nrf5340-dk ncs v1.9.1

prj.conf

# Console

CONFIG_LOG=y

CONFIG_LOG_PRINTK=y

CONFIG_LOG_DEFAULT_LEVEL=3

# UartConsole

CONFIG_UART_CONSOLE=y

CONFIG_LOG_BACKEND_UART=y

# RttConsole

CONFIG_RTT_CONSOLE=n

CONFIG_USE_SEGGER_RTT=n

CONFIG_LOG_BACKEND_RTT=n

# Power Manager

CONFIG_PM=y

CONFIG_PM_DEVICE=y

in test.c

printk("disable_console\n");

k_sleep(K_MSEC(500));

pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);

The Log message "disable_console" woun't disaplay on uart console.

Is there any APIs that can process the log output before console suspend.

Thanks

[Simon]

I tested this myself with NCS v1.9.1 and the nRF5340 DK, and was not able to reproduce. Test it yourself with the same sample:

disable_console.zip

Best regards,

Simon

[kyozc]

Hi Simon:

Thanks for the quick reply. I test your case and the console output was OK.

But if i keep Suspend & Resume the console device. The consle will have no output.

Below is my change on the main.c of your code.

#include <zephyr.h>
#include <sys/printk.h>
#include <pm/device.h>

#define TEST_DELAY 500

#define UART_DEVICE_NAME DT_LABEL(DT_CHOSEN(zephyr_console))

void main(void)
{
	const struct device *console_dev;
	console_dev = device_get_binding(UART_DEVICE_NAME);
    printk("output1\n");
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_RESUME);
    printk("output2\n");
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_RESUME);
    printk("output3\n");
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_RESUME);
    printk("output4\n");
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_RESUME);
    printk("output5\n");
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_RESUME);
    printk("output6\n");
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    k_sleep(K_MSEC(TEST_DELAY));
    pm_device_action_run(console_dev, PM_DEVICE_ACTION_RESUME);
	printk("disable_console\n");
	k_sleep(K_MSEC(TEST_DELAY));
	pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);
    printk("console disabled\n");
    k_sleep(K_MSEC(TEST_DELAY));
}

If i increase the TEST_DELAY to 2000ms , The Console Output will be Normal.

Thanks

Best Regards

Chen

[Simon]

Try setting CONFIG_LOG_PRINTK=n, then your sample should work with a delay of 500ms.

disable_console_v2.zip

Is this an acceptable fix for you?

[kyozc]

Hi Simon:

Thanks .

And we found that there was a API That can make the consle output without delay.

#include <logging/log_ctrl.h>

printk("disable_console\n");
while(log_process(false));
pm_device_action_run(console_dev, PM_DEVICE_ACTION_SUSPEND);