HAL Library does not support UART Rx Timeout RTOR

[serdar onart]

Posted on October 25, 2017 at 11:53

Hi all,

I am using STM32L433, and checked the manual that it supports rx timout for the uart. I am using cubeMX v4.22.1 with Cube L4 firmware Package v1.9.0. I try to receive unknown sized data from UART3 but i do not want to get interrupt for every byte I receive. Therefore i searched for the issue, and i found USART_RTOR, which is perfect for my needs. Ä° try to use it but unfortunatel HAL library does not support this timeout register duties. I try to add these lines to the init part of uart

WRITE_REG

(huart3.

Instance

->RTOR,

3

);

SET_BIT

(huart3.

Instance

->CR1, USART_CR1_RTOIE);

SET_BIT

(huart3.

Instance

->CR2, UART_RECEIVER_TIMEOUT_ENABLE);

then i observe that RTOF flag is set, good news. But i can not find any IRQ triggered when this flag is set. Therefore i can not get interrupt when the receiver timeout occurs. Does anybody have the same issue? Or am i missing something. Furthermore, does the HAL developmend tem planning to add RTOR to the library?

[Tesla DeLorean]

Sorry, bumping old zombie unanswered threads off my feed

[myang.18]

SET_BIT(ModbusHandle.Instance->CR2, USART_CR2_RTOEN);

SET_BIT(ModbusHandle.Instance->CR1, USART_CR1_RTOIE);

WRITE_REG(ModbusHandle.Instance->RTOR,24/*3*/);

Serdar bunu dene.

Birde isterrupta girince bayragı sıfırla.

[Georg Doza]

Is this issue stil unsolved?

Faced with this error when I tried to port software written for stm324F HAL.

Tried zakayangin's solution but it doesn't work because HAL over writes USART_CR1_RTOIE somewhere else in the code and desired interrupt remains disabled.

[Tesla DeLorean]

Not really gained any traction in best part of a year, and we're several versions of HAL and CubeMX away on a different family of parts.

The library source is provided in its entirety, if it doesn't work as desired, fix it, or replace it with a more elegant solution.

[Georg Doza]

At the end I figure out how to solve this issue. The changes was necessary in the CMSIS driver too.

Are there a public place where I can put my version in order to share it with others and to get a chance to discuss about it?

Georg

[wuio]

ST when will you add the option of handling interrupts from idle state and configurable timeout (RTOR) in HAL? This feature would be very useful.

[Jack3]

It's an old post already, but maybe sombody will hit this.

Example with USART2:

Configure RTO

void USART2_Init_RTO_IRQ(void)
{
  /* Enable receive timeout function, set CR2.RTOE */
  SET_BIT(huart2.Instance->CR2, USART_CR2_RTOEN);
  /* Enable receive timeout interrupt, set CR1.RTOIE */
  SET_BIT(huart2.Instance->CR1, USART_CR1_RTOIE);
  /* 
   * Fill the RTOR register with the length of timeout required,
   * in units of  bit times:
   * Modbus-RTU uses 3.5 characters:
   * 3.5 bytes * 11 bits = 39
   */
  WRITE_REG(huart2.Instance->RTOR, 39);  
  /* Reset RTOF flag: */
  SET_BIT(huart2.Instance->ICR, USART_ICR_RTOCF);
}

In stm32..xx_it.c

void USART2_IRQHandler(void)
{
  if((__HAL_UART_GET_FLAG(&huart2, UART_FLAG_RXNE) != RESET) &&
      (__HAL_UART_GET_IT_SOURCE(&huart2, UART_IT_RXNE) != RESET))
  {
    /* Triggers after each byte received */
  }
  if((__HAL_UART_GET_FLAG(&huart2, UART_FLAG_TXE) != RESET) &&
      (__HAL_UART_GET_IT_SOURCE(&huart2, UART_IT_TXE) != RESET))
  {
    /* Triggers after each byte send */
  }
  if (__HAL_UART_GET_FLAG(&huart2, UART_FLAG_RTOF) != RESET)
  {
    /* Triggers after receive timeout (3.5 characters) */
    /* Reset RTOF flag: */
    SET_BIT(USART2->ICR, USART_ICR_RTOCF);
  }
  HAL_UART_IRQHandler(&huart2);
}

Jack.

[NSing.5]

Thanks jack,

your solution has helped me to solve my problem, i was struggling for RTOR interrupt from 3 days. just to clarify my doubt:

1. which one is best to use for interrupt handling

void USARTx_IRQHandler(void) or callback functions

how they are different.

once again thanks