我考虑的有点局限所以都没考虑到中断，版主说的太好了。不过我要做的没有中断，嘿嘿。
我已经用这种方法编好了程序，测了两次，前后两次的数据还是差不多的，接收到的数据也是对的。
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration */
RCC_Configuration();
/* NVIC configuration */
NVIC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
USART_InitStructure.USART_BaudRate = 300;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Even;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_Clock = USART_Clock_Disable;
USART_InitStructure.USART_CPOL = USART_CPOL_Low;
USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
/* Configure USART2 */
USART_Init(USART2, &USART_InitStructure);
/* Enable the USART2 */
USART_Cmd(USART2, ENABLE);
TIM_PrescalerConfig(TIM2, 10, TIM_PSCReloadMode_Immediate);
TIM_SetCounter(TIM2,0);
while(count<1500000)
{
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_10)==1)
count++;
else
count=0;
}
while(GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_6)==1) ;
TIM_Cmd(TIM2, ENABLE); //开定时器
while(GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_6)==0) ;
time=TIM_GetCounter(TIM2);
TIM_Cmd(TIM2, DISABLE);
TIM_PrescalerConfig(TIM2, 10, TIM_PSCReloadMode_Immediate);
while(GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_6)==1) ;
TIM_Cmd(TIM2, ENABLE); //开定时器
while(GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_6)==0) ;
time1=TIM_GetCounter(TIM2);
TIM_Cmd(TIM2, DISABLE);
while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET)
{
}
/* Store the received byte in RxBuffer */
RxBuffer[1] = (USART_ReceiveData(USART2) & 0xFF); |
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