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Nordic Case Info
  • Case ID: 290268
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NCS Uart Console Suspend Before Log Outpput

user115958

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
  • 0

    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:

    Best regards,

    Simon

  • 0 in reply to user72692

    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

  • 0 in reply to user115958

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

    Is this an acceptable fix for you?

  • +1 in reply to user72692

    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);

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