UART configuration - STOP BITS

[Varouzan]

Hello,

I am trying to configure a UART to use in the nrf9160. I am using zephyr's uart.h

This is a snipet of the code I have right now.

  int err=0;
  struct uart_config uart_settings;
  uart_dev = device_get_binding(UART_NAME);
  if(uart_dev == NULL){
    printk("error:could not get %s binding\n",UART_NAME);
    return;
  }
  uart_settings.baudrate = 57600;
  uart_settings.parity = UART_CFG_PARITY_NONE;
  uart_settings.stop_bits = UART_CFG_STOP_BITS_1;
  uart_settings.data_bits = UART_CFG_DATA_BITS_8;
  uart_settings.flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
  err = uart_configure(uart_dev, &uart_settings);
  if(err == 0){
    printk("configured uart\n");
  }
  else{
    printk("error could not configure uart\n");
  }

Code as it is executes successfully, but my issue is that if I set my stop bits to 2, which is what I actually wan to do, I get an error from the uart_configure() func.

Is it possible to somehow set stop bits to 2?

[Martin Lesund]

Hi,

In the uart_nrfx_uart.c file you can see that it only supports stop bits to one.

That is why you get an error "Unsupported value" if you try to set it to something else.

Will talk to the developers to add support for 2.

[Varouzan]

Hi Martin,

I did see that but it just seemed very weird as the nrf9160 datasheet does say that it is possible to have 2 stop bits.

Anyways, thank you.

[Martin Lesund]

It's been reported internally, I will update you as soon as it's fixed