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leds_app.c
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leds_app.c
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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#define msleep(x) usleep(x*1000)
int main(int argc, char **argv)
{
int fd[4];
int val = 0;
int i = 0;
//const char *dev[] = {"/dev/ti_led0", "/dev/ti_led1", "/dev/ti_led2", "/dev/ti_led3"};
const char *dev[] = {"/dev/ti_led2", "/dev/ti_led0", "/dev/ti_led3", "/dev/ti_led1"};
for(i=0; i<4; i++)
{
fd[i] = open(dev[i], O_RDWR);
if (fd[i] < 0)
{
printf("can't open %s\n", *dev[i]);
return 0;
}
}
//leds off all.
for(i=0; i<4; i++)
{
write(fd[i], &val, 1);
}
//flicker leds.
while(1)
{
val = !val;
for(i=0; i<4; i++)
{
write(fd[i], &val, 1);
msleep(300);
}
}
}