NRF5340 UART completely turn off and turn on dynamically in app program

Hello

I am using NRF5340 as Soc in my project. In application program I have used uart0 for data transfer. At the same time the power consumption is really important for me

because the board is battery powered. So in idle times I turn off the uart0 by NRF_UARTE0->ENABLE = 0 command and turn it on again by NRF_UARTE0->ENABLE = 8

command. In this way I can reduce the current consumption from 1.5ma to 0.84ma. The problem is that when I add CONFIG_SERIAL=n in the prj.conf file the current

reduces more and goes to 0.48ma. As far as I could understand from the dev zone studies the NRF_UARTE0->ENABLE = 0 command doesn't turn off the clock of uart0

but the command CONFIG_SERIAL=n does. Now I want to to know how can I completely turn off uart0 in my application program(not by prj.conf modification) and also

turn it on again. Thank you in advance for you support.

Parents

0 Simon over 3 years ago

To enable/disable UART dynamically in your program you can set CONFIG_PM_DEVICE=y and use pm_device_action_run(). Check out the modem shell sample to see how to use this function.

Best regards,

Simon
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0 saeed mahvis over 3 years ago in reply to Simon

Hi Simon

I have added CONFIG_PM_DEVICE=y in the prj.config and also added the modem shell sample code in my program.

I only used the code for uart0. But the sdk can not recognize pm_device_action_run() function and issued

(undefined reference to `pm_device_action_run')

static void uart0_set_enable(bool enable)
{
	const struct device *uart_dev = DEVICE_DT_GET(DT_NODELABEL(uart0));

	if (!device_is_ready(uart_dev)) {
		return;
	}

	pm_device_action_run(uart_dev, enable ? PM_DEVICE_ACTION_RESUME : PM_DEVICE_ACTION_SUSPEND);
}
void disable_uarts(void)
{
	uart0_set_enable(false);
	//uart1_set_enable(false);
}

void enable_uarts(void)
{
	uart0_set_enable(true);
	//uart1_set_enable(true);
}

error.

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