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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#define READS_THR 20
#define RAINBOW_DIVISOR 30
int main() {
int rainbow, equalizer, serial;
fd_set readers;
struct timeval tv;
int r, s, w;
int reads_eq = 0, reads_ra = 0;
int source;
char buf_eq[65], buf_ra[65];
char *srcbuf = buf_eq;
int c = 'a';
int tmp;
rainbow = open("/tmp/ledbar/rainbow", O_RDWR);
equalizer = open("/tmp/ledbar/equalizer", O_RDWR);
serial = open("/tmp/ledbar/serial", O_RDWR);
if(rainbow == -1 || equalizer == -1 || serial == -1) {
perror("Open failed");
return 1;
}
printf( "****************************************\n"
"* Usage: press [r] for rainbow mode *\n"
"* press [e] for equalizer mode *\n"
"* press [a] for automatic mode *\n"
"****************************************\n");
while(1) {
tv.tv_sec = 3;
tv.tv_usec = 0;
FD_ZERO(&readers);
FD_SET(rainbow, &readers);
FD_SET(equalizer, &readers);
FD_SET(fileno(stdin), &readers);
s = select(equalizer+1, &readers, NULL, NULL, &tv);
if(s == -1) {
perror("select failed");
return 2;
}
if(!s)
continue;
if(FD_ISSET(fileno(stdin), &readers)) {
tmp = getc(stdin);
if (tmp != '\r' && tmp != '\n') {
if(tmp != 'a' && tmp != 'r' && tmp != 'e')
printf("Invalid command!\n");
else
c = tmp;
}
}
if(FD_ISSET(equalizer, &readers)) {
r=read(equalizer, buf_eq, sizeof(buf_eq) - 1);
if(r == -1) {
perror("eq read");
return 3;
}
int i;
for(i = 0; i < r; i++) {
if(buf_eq[i]) {
reads_eq++;
break;
}
}
}
if(FD_ISSET(rainbow, &readers)) {
r=read(rainbow, buf_ra, sizeof(buf_ra) - 1);
if(r == -1) {
perror("ra read");
return 3;
}
reads_ra++;
}
if (c == 'a') {
if(reads_eq > READS_THR) {
reads_eq = 0;
reads_ra = 0;
srcbuf = buf_eq;
} else if(reads_ra > READS_THR*RAINBOW_DIVISOR) {
reads_eq = 0;
reads_ra = 0;
srcbuf = buf_ra;
}
} else if (c == 'r') {
srcbuf = buf_ra;
} else if (c == 'e') {
srcbuf = buf_eq;
}
if(write(serial, srcbuf, r) == -1) {
perror("write failed");
return 4;
}
}
close(serial);
close(rainbow);
close(equalizer);
return 0;
}
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