Delta ASDA-B2-F Series User Manual page 198

ASDA-B2-F
Example of CRC Program:
Calculate CRC value in C language. This function needs two parameters:
unsigned char* data;
unsigned char length
The function returns the CRC value as a type 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++ ) {
}
}
return reg_crc;
}
Example of PC communication program:
#include<stdio.h>
#include<dos.h>
#include<conio.h>
#include<process.h>
#define PORT 0x03F8
#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);
outportb(PORT+IER,0x01);
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);
for( I = 0; I<=16; I++ ) {
while( !(inportb(PORT+LSR) & 0x20) );
outportb(PORT+THR,tdat[I]);
}
I = 0;
while( !kbhit() ) {
if( inportb(PORT+LSR)&0x01 ) { /* b0==1, read data ready */
rdat[I++] = inportb(PORT+RDR); /*
}
September, 2015
if( reg_crc & 0x01 ) { /*LSB(bit 0 ) = 1 */
reg_crc = (reg_crc >> 1)^0xA001;
} else {
reg_crc = (reg_crc>>1);
}
/* the address of COM 1 */
/* interrupt enable */
/* set prorocol
<7,E,1> = 1AH,
<8,N,2> = 07H
<8,O,1> = 0BH
/* interrupt as data in */
<7,O,1> = 0AH
<8,E,1> = 1BH
/* wait until THR empty */
/* send data to THR */
read data from RDR */
Communications
*/
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