数据帧满足下面格式:
帧头部(Head) | 类型(Type) | 长度(Length) | 值(Value) | CRC校验 |
2字节 | 1字节 | 1字节 | X字节 | 2字节 |
0xaa 0x55 | 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);//打开接收中断
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) //帧头0xAA
{
rCnt = (0xAA != rCh)?0:rCnt+1;
}
else if (rCnt == 1) //帧头0x55
{
rCnt = (0x55 != rCh)?0:rCnt+1;
}
else if (rCnt == 2) //类型type
{
//这里可以根据类型的范围进行如上的处理
rCnt++;
}
else if (rCnt == 3) //长度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);//缓冲
COM6_RecvFin = 1; //通知主循环处理
}
}
}
}
int main(void)
{
int i;
//代码段1
while (1)//该循环不能太慢,否则数据缓冲区会被部分修改
{
//代码段2
if (COM6_RecvFin == 1)
{
COM6_RecvFin = 0;
CMD_Analysis();//分析接收到的这帧数据
}
//代码段3
}
return 0;
}
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推荐阅读最新更新时间:2024-03-16 15:42