main() {
char tabuf[90];
int i, j;
int CRC;
int unCRC;
char buf[100];
printf("Testing CRC generation.\n");
for(i = 0; i < 90; i++)
tabuf[i] = i;
for(i = 0; i <= 90; i+=2) {
memset(buf, 0, 100);
for(j = 0; j < i; j++)
buf[j] = tabuf[j];
CRC = 0;
memcpy(buf+i, &CRC, sizeof(int));
CRC = genCRC(buf, i+4);
printf("CRC is %08X.\n", CRC);
//buf[i] = (CRC & 0xFF000000) >> 24;
//buf[i+1] = (CRC & 0x00FF0000) >> 16;
//buf[i+2] = (CRC & 0x0000FF00) >> 8;
//buf[i+3] = CRC & 0x000000FF;
CRC = htonl(CRC);
memcpy(buf+i, &CRC, sizeof(int));
unCRC = genCRC(buf, i+4);
printf("unCRC is %08X.\n", unCRC);
if(unCRC == 0)
printf("Case %d passed.\n", i/2);
else
printf("Case %d failed.\n", i/2);
usleep(100000);
}
}
static int send_cmd(struct recboat_type *recboat, int cmd, int len, int id, char *buf)
{
char msg[512];
short crc = 0;
int err = 0;
msg[0] = 0x53; /* start bytes */
msg[1] = 0x74;
msg[2] = cmd >> 8;
msg[3] = cmd & 0xff;
msg[4] = len >> 8;
msg[5] = len & 0xff;
msg[6] = id >> 8;
msg[7] = id & 0xff;
memcpy(&msg[8], buf, len);
crc = genCRC(msg, len+8);
msg[len+8] = crc >> 8;
msg[len+8+1] = crc & 0xff;
sendto(recboat->s, msg, len+10, 0, (struct sockaddr *) &recboat->dest,
sizeof(recboat->dest));
return(err);
}
