What are the conditions for enabling the serial port interrupt USART_INT_IDLE of GD32F103?

bigbat

What are the conditions for enabling the serial port interrupt USART_INT_IDLE of GD32F103? [Copy link]

 

When I initialized UART, I added the idle setting.

usart_enable(USART0);
  
/* enable USART0 receive interrupt */
usart_interrupt_enable(USART0, USART_INT_RBNE);
usart_interrupt_enable(USART0, USART_INT_IDLE);

However, after receiving data, the interrupt can enter, but USART_INT_IDLE never occurs

void USART0_IRQHandler(void)
{
   uint8_t uart_data; 
   if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE)){

	 usart_interrupt_flag_clear(USART0, USART_INT_FLAG_RBNE);         
	 /* read one byte from the receive data register */
	    uart_data  = (uint8_t)usart_data_receive(USART0);
     rx_buffer[rx_counter++] = uart_data;
    
    }       

	if(RESET != usart_interrupt_flag_get(USART0, USART_INT_IDLE))
    {
		usart_interrupt_flag_clear(USART0, USART_INT_IDLE);         
	    rx_idel = TRUE;
	}
		
    if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_TBE)){
         usart_interrupt_flag_clear(USART0, USART_INT_FLAG_TBE);
    }
		
}

Could you please tell me what are the conditions for enabling the GD32F103 interrupt USART_INT_IDLE?

lugl4313820

Do you want to do indefinite length reception? Do you mean the conditions for entering interrupt?

bigbat

lugl4313820 posted on 2022-6-3 12:25 Do you want to do indefinite length reception? Are you talking about the conditions for entering the interrupt?

Yes, I use this interrupt in stm32, but once GD32 is turned on, not only can it not be interrupted, but it also behaves abnormally in various ways.

lugl4313820

bigbat posted on 2022-6-3 17:18 Yes, I used this interrupt in stm32, but once GD32 is turned on, not only can it not be interrupted, but it is also abnormal in various ways.

Idle interrupt, different products and chips have different definitions of idle interrupt, so the specific implementation should be based on practice. In fact, the best implementation method is the timer detection method, which is universal. The idle interrupt of STM32 is more applicable. The CH582 I used last time is quite different from STM32!

bigbat

lugl4313820 posted on 2022-6-3 21:38 Idle interrupts, different products and chips have different definitions of idle interrupts. The specific implementation depends on practice. In fact, the best way to implement it is a timer...

This is what I have read in the GD32 manual: "This interrupt is generated after receiving data, that is, after USART_INT_FLAG_RBNE is set, if the bus is 'idle' for a cycle, this interrupt will be generated. This seems to be the same as the understanding of stm32. It says: It needs to be detected before the USART_INT_RBNE interrupt, and the usart_interrupt_flag_get function will clear the flag. I tried this but it didn't work.

lugl4313820

bigbat posted on 2022-6-4 10:13 This is what I have read in the GD32 manual: "This interrupt is after receiving data, that is, after USART_INT_FLAG_RBNE is set, if there is a bus...

You can enter the interrupt by setting the length of the idle interrupt to 1

bigbat

lugl4313820 posted on 2022-6-4 10:20 You can enter the interrupt by setting the length of the idle interrupt to 1

Give me some tips, how to set it? Tell me the code, in stm32, USART_INT_RBNE is not needed, only USART_INT_IDLE is enough, but I didn't succeed either.

lugl4313820

bigbat posted on 2022-6-4 10:51 Give me some tips, how to set it? Talk about the code, in stm32, USART_INT_RBNE is not needed, only USART_INT_IDLE is enough, but I also...

Wait, I'll study it and write a post then.

lugl4313820

lugl4313820 posted on 2022-6-4 15:45 Wait, I'll study it and write a post then.

I have already posted a post, you can just refer to it:

【GD32F310G-START】USART indefinite length reception - GD32 MCU - Electronic Engineering World - Forum (eeworld.com.cn)