void RCC_Configuration(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure USART Tx and Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_9;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource8,GPIO_AF_USART3);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource9,GPIO_AF_USART3);
}
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
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(USART3,&USART_InitStructure); /* Configure USART1 basic and asynchronous paramters */
//USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);
USART_ITConfig(USART3,USART_IT_TXE,ENABLE);
USART_Cmd(USART3, ENABLE); /* Enable USART1 */
USART_ClearITPendingBit(USART3,USART_IT_TC);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;//?????
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
USART_Configuration();
while(1);
}
volatile char StringLoop[] = "The quick brown fox jumps over the lazy dog";
void USART3_IRQHandler(void)
{
static int tx_index = 0;
// static int rx_index = 0;
if (USART_GetITStatus(USART3, USART_IT_TXE) != RESET) // Transmit the string in a loop
{
USART_ClearITPendingBit(USART3, USART_IT_TXE);
USART_SendData(USART3, StringLoop[tx_index++]);
if (tx_index >= (sizeof(StringLoop) - 1))
tx_index = 0;
}
}
就是这个程序为什么会不停的发送数据，PC接收端一直在接收，不是清除了标志位吗，想问问大家啊