In the interrupt of serial port 1, data is output in both serial port 1 and serial port 2. Serial port 1 first sends data, then serial port 2 sends data. After serial port 1 outputs a few frames of data at the beginning, there is no data output, while serial port 2 still has data output。
The two serial port functions are as follows
USART1_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE); //
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//USART1_TX GPIOA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure); //GPIOA.9
//USART1_RX GPIOA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //
GPIO_Init(GPIOA, &GPIO_InitStructure); //GPIOA.10
/* UserTestOperation NVIC */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//USART1 �?始化设置
USART_InitStructure.USART_BaudRate = 9600; //
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //
USART_InitStructure.USART_StopBits = USART_StopBits_1; //
USART_InitStructure.USART_Parity = USART_Parity_No; //
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //
USART_Init(USART1, &USART_InitStructure); //
USART_ITConfig(USART1, USART_IT_PE, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART1, USART_IT_ORE, ENABLE);
USART_ITConfig(USART1, USART_IT_TC, ENABLE);
USART_Cmd(USART1, ENABLE); //
}
2.
void USART1_IRQHandler(void)
{
u8 temp0 = 0;
__NOP();
if(USART_GetITStatus(USART1, USART_IT_PE) != RESET)
{
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
UART1Rx[UART1RxIndex] = USART_ReceiveData(USART1);
UART1Idle = 0;
if(UART1RxIndex < UART1_RX_LENGTH - 1)
{
UART1RxIndex++;
}
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_ORE) != RESET)
{
USART_ReceiveData(USART1);
USART_ClearITPendingBit(USART1,USART_IT_ORE);
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET) //useless
{
__NOP();
}
if( USART_GetITStatus(USART1, USART_IT_TC) == SET )
{
USART_ClearITPendingBit(USART1,USART_IT_TC);
UART1TxIndex++;
if(UART1TxIndex < UART1TxLong)
{
temp0 = UART1Tx[UART1TxIndex];
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
{
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
}
USART_SendData(USART1,temp0);
while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)
{
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
}
USART_SendData(USART2,temp0);
}
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)
{
USART_ClearITPendingBit(USART1,USART_IT_IDLE);
USART_ReceiveData(USART1);
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_ERR) != RESET)
{
USART_ReceiveData(USART1);
USART_ClearITPendingBit(USART1,USART_IT_ERR);
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_NE) != RESET)
{
USART_ReceiveData(USART1);
USART_ClearITPendingBit(USART1,USART_IT_NE);
__NOP();
}
if(USART_GetITStatus(USART1, USART_IT_FE) != RESET)
{
USART_ReceiveData(USART1);
USART_ClearITPendingBit(USART1,USART_IT_FE);
__NOP();
}
__NOP();
}
