How to enable/disable the UART with NCS/Zephyr

RE: How to enable/disable the UART with NCS/Zephyr

Priyanka — Thu, 13 Oct 2022 12:17:37 GMT

Hi,

The System can be woken up, when in System OFF mode, only by certain peripherals. You can refer the System OFF mode documentation for this.

-Priyanka

RE: How to enable/disable the UART with NCS/Zephyr

MDF — Mon, 10 Oct 2022 09:20:17 GMT

Hello

I had a look at this other article, but nothing I tried helped me.

I managed to get around the exception - I'm not sure what I did, but I guess the LPUART feature was not enabled in Config - but now I have the issue that the GPIOs are not longer working.

When my application is idle for more than 20 seconds (which means, there is not BLE connect) I going into PM_DEVICE_ACTION_SUSPEND and this seems to work because tge current goes to some 10 µA

I'm trying to use GPIO Port P0.07 for wakeup, simply by checking the Port signal in my main loop and this does not longer work. It works well without PM_DEVICE_ACTION_SUSPEND, although this refers to device_get_binding ("UART_0") but it appears as if the whole chip goes into some deep sleep mode. The only way to wake up seems a hardware reset.

The examples for LPUART seem to have a built-in wakeup behaviour - but I cant use this.

can you tell me how to use the GPIOs while the UART is suspended ?

thanks, Matthias

RE: How to enable/disable the UART with NCS/Zephyr

Priyanka — Tue, 06 Sep 2022 13:26:16 GMT

Could you take a look at this ticket?

-Priyanka

RE: How to enable/disable the UART with NCS/Zephyr

Priyanka — Thu, 01 Sep 2022 12:12:56 GMT

Hi,

I will be away for the weekend and will get back to you on Monday with a reply.

-Priyanka

RE: How to enable/disable the UART with NCS/Zephyr

MDF — Wed, 31 Aug 2022 14:42:10 GMT

I tried a code like this - but it causes a kernel crash:

void uart_power_down() { int err; enum pm_device_state uart0_power_state; const struct device* dev; dev = device_get_binding(CONFIG_BT_NUS_UART_DEV); err = pm_device_state_get(dev, &uart0_power_state); if (uart0_power_state == PM_DEVICE_STATE_ACTIVE) { err = pm_device_action_run(dev, PM_DEVICE_ACTION_SUSPEND); <-- crash! if (err) error(); } }