STM8 USART one time receive only two bytes

[David.Cheng]

INTERRUPT_HANDLER(USART1_RX_TIM5_CC_IRQHandler,28)
{
 /* In order to detect unexpected events during development,
 it is recommended to set a breakpoint on the following instruction.
 */
 
 //uint8_t temp = USART1->SR;
 
 
 if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET)
 {
 
 uint8_t temp = USART_ReceiveData8(USART1);
 if(pos < 20)
 {
 //pos = 0;
 RX_buf[pos] = temp;
 pos++;
 }
 
 
 }
 
 
 
 
 //USART_ClearITPendingBit(USART1, USART_IT_RXNE);
 
 
}

void usart_setup(void)
{
 GPIO_ExternalPullUpConfig(GPIOC, GPIO_Pin_3, ENABLE);
 GPIO_ExternalPullUpConfig(GPIOC, GPIO_Pin_2, ENABLE);
 
 CLK_PeripheralClockConfig(CLK_Peripheral_USART1, ENABLE);
 USART_DeInit(USART1);
 USART_Init(USART1, (uint32_t)9600, USART_WordLength_8b, USART_StopBits_1,
 USART_Parity_No, (USART_Mode_TypeDef)(USART_Mode_Tx | USART_Mode_Rx));
 
 
 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
 USART_Cmd(USART1, ENABLE);
 
}

i dont know why one time only receive two bytes

[Cristian Gyorgy]

Hello Cheng!

I personally don't understand much from your post.

If you search some help, try to post something so that we can understand your problem.

Good luck!

[David.Cheng]

a rx to common interrupt effect me