RAK11720 can't set serial parity

LPWAN Modules / EVBs RAK11720
1

I’m currently developing code using the RAK11720 Arduino libraries (v4.2.2). I need to use UART1 with even parity, however the library always defaults to no parity. I have had to go into the library code to change this (uhal_uart.c function uart_init()). Please can you resolve this bug to the next library release and let me know when this has been implemented.

2

Hi @marinafinch ,

I can check this with the team. But as far as I know, parity bit configuration is not supported by RUI3.

Have you tried to directly set it via STM32 registered?

Something like this:

  Serial.begin(115200);

  // USART2 registers
  // M0 bit (Bit 12) = 1 for 9-bit word length (8 data + 1 parity)
  // PCE bit (Bit 10) = 1 for Parity Control Enable
  // PS bit (Bit 9) = 0 for Even Parity (1 for Odd)
  
  USART2->CR1 |= USART_CR1_M0;  // Set Word length to 9 bits
  USART2->CR1 |= USART_CR1_PCE; // Enable Parity
  USART2->CR1 &= ~USART_CR1_PS; // Set to Even Parity

This compiles but I haven’t tested.