STM32怎么判断发送的数据和接收到的数据是一样的

Question

比如我要发送一个1024个字节的数据，我用什么来判断字节数和内容是一致的。

Answer 1

#define PACK_DATA_LEN (1024)
typedef struct
{
    unsigned char head[2]; /*帧头，我这边定义帧头为0xAA 0x55*/
        unsigned char data[PACK_DATA_LEN]; /*存放你想要的数据*/
        unsigned char checksum; /*校验和,从*/
}T_Pack; /*数据包定义*/

T_Pack rxPack = {0}; 
T_Pack txPack = {0}; 

/*校验和*/
unsigned char checkSum(unsigned char *buf, unsigned int bufLen)
{
    unsigned int i;
    unsigned char ret = 0;
    for(i=0; i< bufLen; i++)
    {
        ret += buf[i];
    }
    return ret;
}

/*发包*/
void sendPack(unsigned char *buf, unsigned int bufLen)
{
    unsigned int i;
    /*设置帧头*/
    txPack[0] = 0xAA;
    txPack[1] = 0x55;
    for(i=0; (i<bufLen)&&(i<PACK_DATA_LEN); i++)
    {
        txPack.data[i] = buf[i];
    }
    txPack.checksum = checkSum((unsigned char *)&txPack, sizeof(txPack)-1);
    uartSend((unsigned char *)&txPack, sizeof(txPack)); /*使用自己定义的串口发送函数*/
}

/*解包*/
void findPack(unsigned char byteMsg) /*输入参数为从串口获得的一个数据*/
{
    static unsigned char caseStu = 0;
    static unsigned int count = 0;
    static unsigned char* p = (unsigned char*)&rxPack;
    switch(caseStu)
    {
        case 0: /*判断hread 1*/
        count = 0;
            if(byteMsg == 0xAA) 
            {
                p[count++] = byteMsg;
                caseStu++;
            }
        break;
        case 1: /*处理head 2*/
            if(byteMsg == 0x55) 
            {
                p[count++] = byteMsg;
                caseStu++;
            }
            else
            {
                caseStu = 0;
            }
        break;
        case 2: 
            p[count++] = byteMsg;
            if(count >= PACK_DATA_LEN+3) /*收到一包数据*/
            {
                if(checkSum(p, count-1) == p[count-1]) /*校验数据正确性*/
                {
                    rxPack.data ... /*data里面的数据就是接收的正确数据了*/
                }
                caseStu = 0; 
            }
        break;
    }
}