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/*
* poll i2c RDS receiver [Philips saa6588]
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/i2c.h>
int debug;
/* ----------------------------------------------------------------- */
char rds_psn[9];
char rds_txt[65];
void rds_decode(int blkno,int b1, int b2)
{
static int group,spare,c1,c2;
switch (blkno) {
case 0:
if (debug)
fprintf(stderr,"block A - id=%d\n",
(b1 << 8) | b2);
break;
case 1:
if (debug)
fprintf(stderr,"block B - group=%d%c tp=%d pty=%d spare=%d\n",
(b1 >> 4) & 0x0f,
((b1 >> 3) & 0x01) + 'A',
(b1 >> 2) & 0x01,
((b1 << 3) & 0x18) | ((b2 >> 5) & 0x07),
b2 & 0x1f);
group = (b1 >> 3) & 0x1f;
spare = b2 & 0x1f;
break;
case 2:
if (debug)
fprintf(stderr,"block C - 0x%02x 0x%02x\n",b1,b2);
c1 = b1;
c2 = b2;
break;
case 3:
if (debug)
fprintf(stderr,"block D - 0x%02x 0x%02x\n",b1,b2);
switch (group) {
case 0:
rds_psn[2*(spare & 0x03)+0] = b1;
rds_psn[2*(spare & 0x03)+1] = b2;
if ((spare & 0x03) == 0x03)
fprintf(stderr,"PSN #>%s<#\n",rds_psn);
break;
case 4:
rds_txt[4*(spare & 0x0f)+0] = c1;
rds_txt[4*(spare & 0x0f)+1] = c2;
rds_txt[4*(spare & 0x0f)+2] = b1;
rds_txt[4*(spare & 0x0f)+3] = b2;
if ((spare & 0x0f) == 0x0f)
fprintf(stderr,"TXT #>%s<#\n",rds_txt);
break;
}
break;
default:
fprintf(stderr,"unknown block [%d]\n",blkno);
}
}
int
main(int argc, char *argv[])
{
int c,f,rc, no, lastno = -1;
unsigned char b[40];
char *device = "/dev/i2c-0";
/* parse options */
while (-1 != (c=getopt(argc,argv,"hvd:"))) {
switch (c){
case 'd':
if (optarg)
device = optarg;
break;
case 'v':
debug = 1;
break;
case 'h':
default:
printf("poll i2c RDS receiver [saa6588] via chardev\n");
printf("usage: %s [ -d i2c-device ]\n",argv[0]);
exit(1);
}
}
if (-1 == (f = open(device,O_RDWR))) {
fprintf(stderr,"open %s: %s\n",device,strerror(errno));
exit(1);
}
ioctl(f,I2C_SLAVE,0x20 >> 1);
for (;;) {
memset(b,0,sizeof(b));
rc = read(f,b,6);
if (6 != rc) {
fprintf(stderr,"oops: read: rc=%d, expected 6 [%s]\n",
rc,strerror(errno));
break;
}
if (0 == (b[0] & 0x10)) {
fprintf(stderr,"no signal\r");
continue;
}
if (1 == (b[0] & 0x08)) {
fprintf(stderr,"overflow detected\n");
}
if (1 == (b[0] & 0x04)) {
fprintf(stderr,"reset detected\n");
}
if (debug)
fprintf(stderr,"raw: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
b[0],b[1],b[2],b[3],b[4],b[5]);
no = b[0] >> 5;
if (lastno != no) {
rds_decode(no, b[1], b[2]);
lastno = no;
}
usleep(10*1000);
}
close(f);
exit(0);
}
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