stc15w4k56s4会偶尔算错crc
使用芯片stc15w4k56s4,串口1接收命令，串口2，3依次下发命令。发送偶尔就来一次crc算错了，下一帧crc又好了。计算错误在串口发送之前，很神奇，是指针用的有问题吗？unsigned char motor_s3_long={0x7f,0x10,0x06,0x06,0x00,0x02,0x04,0x0b,0xb1,0x00,0x00,0x94,0x0f};
void Message_Composed2_Long(uint address,uint cmds_1,uint cmds_2)
{
motor_s3_long =address/256;
motor_s3_long =address%256;
motor_s3_long =cmds_1/256;
motor_s3_long =cmds_1%256;
motor_s3_long =cmds_2/256;
motor_s3_long=cmds_2%256;
}void S3_Send_RS485(unsigned char *sendline,unsigned char length)
{
unsigned char i=0, j=0,n=0;
unsigned short reg_crc=0xffff;
//crc计算-----------------------------//
while((i<(length-2)))
{
reg_crc^= sendline;
for (j=0; j<8; j++ )
{
if( reg_crc & 0x01 )
{
reg_crc = (reg_crc >> 1)^0xA001;
}
else
{
reg_crc = (reg_crc>>1);
}
}
i++;
}
sendline=(reg_crc/256)%256;
sendline=reg_crc%256;
RS485_2 = 1;
for(n=0;n<length;n++)
{
S3_SendByte(sendline);
}
RS485_2 = 0;
}Message_Composed2_Long(ASD6003,by_speed2,0x0000);
S3_Send_RS485(motor_s3_long,13);
页:
[1]