LIBUARTE: Disable UARTE peripheral and pull TX pin low for power-saving.

[Norbert]

Hi,

I am using LIBUARTE on our custom board. The UARTE is talking to a device which may temporarily be powered-down while the system is in low-power state.

Two questions:

1. What is the recommended way to disable the UARTE peripheral for lowest possible power consumption? What would then be necessary to bring it back online?

2. While external device connected to the UARTE is powered-down, the TX pin has to be driven low to avoid leaking current into the external device. What is the best way to achieve this? Currently, I am re-configuring the TX pin to an unused pin so that I can define the pin state via the GPIO. Quite a hack so that I am looking for clean solution.

Thanks,

Norbert

[Vidar Berg]

Hi,

1. The recommended approach is to uninitialize the driver, and re-initialize when you need to use it again.

2. The pins are free to be re-configured as soon as you have uninitialized the driver. So you can make the re-configuration of the pins a part of your unitialization routine.

Best regards,

Vidar

[Norbert]

Hi Vidar,

I tested this and it works as described.

Thank you very much,

Norbert