UART issuses on nRF Connect SDK 1.5.1

[Stanley]

Hello Nordic Team,

I am having issues with the peripheral_uart firmware for the nRF52833.

1.I can use UART_init() or nrf_drv_uart_uninit() in nRF52-SDK to enable or disable UART. How can I do that in NCS?

2.I changed the baud rate to 921600bps. An error occurred that caused the system to reset. I found that it is caused by k_free (buf) in ble_write_thread (). How can I solve it?

3.Can I use firmware to configure an external or internal 32.768k crystal oscillator?

Thanks,

Stanley

[Stanley]

Hi Håkon,

I get some error messages in UART console.

I use arm-none-eabi-addr2line to resolv the addresses.

I think it happened in the line k_free(buf).

Thanks,

Stanley

[Håkon Alseth]

Hi Stanley,

 

I added some prints in the uart callback "uart_cb". I'm not able to get the program to fault, but it does print a warning at my end:

<wrn> peripheral_uart: Not able to allocate UART receive buff

 

This in combination with event type "UART_RX_STOPPED" indicates that an ERRORSRC has occurred, atleast on my end.

I think the baudrate is causing this error, as it has a higher tolerance with 921k6 baud:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/uarte.html?cp=4_2_0_34_9_10#register.BAUDRATE

 

Could you try a baudrate that matches the expected baud, like 1M?

 

Kind regards,

Håkon