STM32串口中斷接收數(shù)據(jù)
數(shù)據(jù)幀滿足下面格式：
幀頭部（Head）
類型（Type）
長度（Length）
值（Value）
CRC校驗
2字節(jié)
1字節(jié)
1字節(jié)
X字節(jié)
2字節(jié)
0xaa0x55
X
void USART6_Init (void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE); //修改
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;//修改
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC,&GPIO_InitStructure);//修改
GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_USART6);//修改
GPIO_PinAFConfig(GPIOC,GPIO_PinSource7,GPIO_AF_USART6); //修改
NVIC_InitStructure.NVIC_IRQChannel = USART6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_Init(USART6,&USART_InitStructure);
USART_ITConfig(USART6,USART_IT_RXNE,ENABLE);//打開接收中斷
USART_Cmd(USART6,ENABLE);
}
void USART6_IRQHandler()
{
unsigned char rCh;
static char rCnt = 0;
if (USART_GetITStatus(USART6,USART_IT_RXNE) != RESET)
{
rCh = USART_ReceiveData(USART6);
COM6_RecvBuf[rCnt] = rCh;
if (rCnt == 0) //幀頭0xAA
{
rCnt = (0xAA != rCh)?0:rCnt+1;
}
else if (rCnt == 1) //幀頭0x55
{
rCnt = (0x55 != rCh)?0:rCnt+1;
}
else if (rCnt == 2) //類型type
{
//這里可以根據(jù)類型的范圍進行如上的處理
rCnt++;
}
else if (rCnt == 3) //長度len
{
rCnt++;
}
else if (rCnt > 3) //值value
{
rCnt++;
if (rCnt == 6+COM6_RecvBuf[3])
{
rCnt = 0;
memcpy(COM6_RecvBufBck,COM6_RecvBuf,RECV_BUF_SZ);//緩沖
COM6_RecvFin = 1; //通知主循環(huán)處理
}
}
}
}
int main(void)
{
int i;
//代碼段1
while (1)//該循環(huán)不能太慢，否則數(shù)據(jù)緩沖區(qū)會被部分修改
{
//代碼段2
if (COM6_RecvFin == 1)
{
COM6_RecvFin = 0;
CMD_Analysis();//分析接收到的這幀數(shù)據(jù)
}
//代碼段3
}
return 0;
}
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