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如果选择CRC16模式的话,一共用到两个函数,一个是CRC_CHECK,一个是OutPut_Data,在OutPut_Data里调用CRC_CHECK并把想要发的数据用串口发送就好了,下面是这两个函数:
/************************CRC检验函数************************************/
unsigned short CRC_CHECK(unsigned char *Buf, unsigned char CRC_CNT)
{
unsigned short CRC_Temp;
unsigned char i,j;
CRC_Temp = 0xffff;
for (i=0;i<CRC_CNT; i++){
CRC_Temp ^= Buf[i];
for (j=0;j<8;j++) {
if (CRC_Temp & 0x01)
CRC_Temp = (CRC_Temp >>1 ) ^ 0xa001;
else
CRC_Temp = CRC_Temp >> 1;
}
}
return(CRC_Temp);
}
/****************************输出符合协议的数据*************************/
//参数*OutData为需要显示的数字,长度为4
void OutPut_Data(int* OutData)
{
int temp[4] = {0};
unsigned int templ[4] = {0};
unsigned char databuf[10] = {0};
unsigned char i;
unsigned short CRC16 = 0;
for(i = 0; i < 4; i++)
{
temp[i] = (int)(OutData+i);
templ[i] = (unsigned int)temp[i];
}
for(i = 0; i < 4; i++)
{
databuf[i*2] = (unsigned char)(templ[i]%256);
databuf[i*2+1]= (unsigned char)(templ[i]/256);
}
CRC16 = CRC_CHECK(databuf,8);
databuf[8] = CRC16%256;
databuf[9] = CRC16/256;
for(i = 0; i < 10; i++)
{
//uart_putchar(UARTn,(char)databuf[i]);
Uart_SendChar(UARTR2,databuf[i]);
}
} |
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