#define TX_8(P1) SEND_DATA((P1)&0xFF) //發送單個字節
#define TX_8N(P,N) SendNU8((uint8 *)P,N) //發送N個字節
#define TX_16(P1) TX_8((P1)>>8);TX_8(P1) //發送16位整數
#define TX_16N(P,N) SendNU16((uint16 *)P,N) //發送N個16位整數
#define TX_32(P1) TX_16((P1)>>16);TX_16((P1)&0xFFFF) //發送32位整數
#define SEND_DATA(P) SendChar(P) //發送一個字節
#define BEGIN_CMD() TX_8(0XEE) //幀頭
#define END_CMD() TX_32(0XFFFCFFFF) //幀尾
void BEGIN_CMD()
{
TX_8(0XEE);
_crc16 = 0XFFFF; //開始計算CRC16
}
void END_CMD()
{
uint16 crc16 = _crc16;
TX_16(crc16); //發送CRC16
TX_32(0XFFFCFFFF);
}
這種一前一后的定義怎樣理解，求大佬指點
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