數(shù)據(jù)幀滿足下面格式：

幀頭部（Head）

類型（Type）

長(zhǎng)度（Length）

值（Value）

CRC校驗(yàn)

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(jìn)行如上的處理

rCnt++;

}

else if (rCnt == 3) //長(zhǎng)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(huì)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;

}