libuarte rx start after stop

[gnf]

After executing nrf_libuarte_drv_rx_stop(), nrf_libuarte_drv_rx_start() will produce an error.

In nrf_libuarte_drv_rx_start() this line in nrf_libuarte_drv.c (Line 625 in SDK 17.1.0) tries to enable the timer but fails:

nrfx_timer_enable(&p_libuarte->timer);

What would be the preferred way of starting and stopping rx, if not using nrf_libuarte_drv_rx_stop() and nrf_libuarte_drv_rx_start()? My goal is put the device to sleep when there are no more RX bytes to receive.

[Hung Bui]

Hi Gnf, 

If you use nrf_libuarte_async, I would suggest to wait until the RX timeout occurs before you put the chip to sleep. 
Otherwise you may need to call nrf_libuarte_async_uninit() to stop any timer and sleep. Next time when you want to receive you need to init the module again. 

[gnf]

Ok. I am using nrf_libuarte, not nrf_libuarte_async. Should I use init/uninit instead?

[Hung Bui]

Hi Gnf, 
Then it should work. Could you let me know which exact error you have ? 
Can you send the code you used ? 

[gnf]

I tried creating a minimal working example of the error. Please see the attached zip file below. I used the libuarte example in SDK 17.1.0

The error occurs the second time nrf_libuarte_drv_rx_start() is executed (line 206 in main.c in the zip file):

  err_code = nrf_libuarte_drv_rx_start(&libuarte, rx_buffer, sizeof(rx_buffer), 0);
  APP_ERROR_CHECK(err_code);
  
  nrf_libuarte_drv_rx_stop(&libuarte);

// The error is on the following line:
  err_code = nrf_libuarte_drv_rx_start(&libuarte, rx_buffer, sizeof(rx_buffer), 0);
  APP_ERROR_CHECK(err_code);

libuarte_start_stop_8a31e13a09.zip

[Hung Bui]

Please let me know which exact error you received. 
In my test here I don't see any error (error_code = 0): 

[gnf]

I use full assert (DEBUG and DEBUG_NRF). The error is an assertion error in nrfx_timer.c:

[Hung Bui]

Hi Gnf, 
You are right. After compile with Debug version I can see the error. 

I will check with the team but for me it seems to be a bug in the libuarte code. 
I think    nrfx_timer_disable(&p_libuarte->timer); need to be added inside nrf_libuarte_drv_rx_stop(). 

After I added that it seems to works fine. 

I will keep you updated when I get the confirmation from the team. 

[gnf]

Hung Bui, any news regarding this?

[Hung Bui]

Hi Gnf, 

Unfortunately, I haven't got any update on this issue.