Delta ASD-A2R-0421 Series - Page 537

Chapter 9 Communication ASDA-A2R Series
Revision December, 2014
9-13
Example of CRC program:
Produce CRC in C language. This function needs two parameters:
unsigned char* data;
unsigned char length
This function returns CRC of unsigned integer.
unsigned int crc_chk(unsigned char* data, unsigned char length) {
int j;
unsigned int reg_crc=0xFFFF;
while( length-- ) {
reg_crc^= *data++;
for (j=0; j<8; j++ ) {
if( reg_crc & 0x01 ) { /*LSB(bit 0 ) = 1 */
reg_crc = (reg_crc >> 1)^0xA001;
} else {
reg_crc = (reg_crc>>1);
}
}
}
return reg_crc;
}
Example of personal computer procedure:
#include<stdio.h>
#include<dos.h>
#include<conio.h>
#include<process.h>
#define PORT 0x03F8 /* the address of COM 1 */
#define THR 0x0000
#define RDR 0x0000
#define BRDL 0x0000
#define IER 0x0001
#define BRDH 0x0001
#define LCR 0x0003
#define MCR 0x0004
#define LSR 0x0005
#define MSR 0x0006
unsigned char rdat[60];
/* read 2 data from address 0200H of ASD with address 1 */
unsigned char tdat[60]={‘:’,’0’,’1’,’0’,’3’,’0’,’2’,’0’,’0’,’0’,’0’,’0’,’2’,’F’,’8’,’\r’,’\n’};
void main() {
int I;
outportb(PORT+MCR,0x08); /* interrupt enable */
outportb(PORT+IER,0x01); /* interrupt as data in */
outportb(PORT+LCR,( inportb(PORT+LCR) | 0x80 ) );
/* the BRDL/BRDH can be access as LCR.b7 == 1 */
outportb(PORT+BRDL,12);
outportb(PORT+BRDH,0x00);
outportb(PORT+LCR,0x06); /* set prorocol
<7,E,1> = 1AH, <7,O,1> = 0AH
<8,N,2> = 07H <8,E,1> = 1BH