How to turn off completely UART in nRF52840

RE: How to turn off completely UART in nRF52840

Elisa — Thu, 11 Jun 2020 08:47:00 GMT

Thank you Einar! It works!

RE: How to turn off completely UART in nRF52840

Einar Thorsrud — Wed, 10 Jun 2020 06:29:21 GMT

Hi,

You could try to toggle the power tot he UARTE peripheral by writing to a hidden register as described in this post.

RE: How to turn off completely UART in nRF52840

Elisa — Tue, 09 Jun 2020 16:11:39 GMT

Thank you Vojislav, but it’s not the same case. I don’t power on/off the UART in BLE events, but in a similar way in a callback invoked by app-scheduler and the scheduled event is generated by an app-timer periodic callback:

/**@brief Periodic handler function to be called by the scheduler. */

void periodic_scheduler_event_handler(void *p_event_data, uint16_t event_size)

{

char string[] = {'\0', '\0', ':', '\0'};

nrf_gpio_pin_toggle(LED_1);

byteToHex(counter, string);

uart_init();

app_uart_putstr(string, 4);

app_uart_close();

counter++;

}

/**@brief Timeout handler for the repeated timer used for toggling LED 1.

* @details Print a log line indicating weather executing in thread/main or interrupt mode.

static void timer_handler(void * p_context)

{

app_sched_event_put(NULL, 0, periodic_scheduler_event_handler);

}

I still need a feedback.

RE: How to turn off completely UART in nRF52840

Vojislav — Mon, 08 Jun 2020 08:18:47 GMT

Hi Elisa,

I had similar problem when working with nrf52811. I was using SDK 15.3 and I was testing this on nRF52840, so it should also work for you.
https://devzone.nordicsemi.com/f/nordic-q-a/58745/uart-disable-problem
Check the verified answer.

Best regards,
Vojislav.