I need to read all 7 analog pins in the BBB every 5 milliseconds. I'm doing
so with the following C code:
void main(){
char value_str[7];
long int value_int = 0;
FILE* f0 = fopen("/sys/bus/iio/devices/iio:device0/in_voltage0_raw", "r");
while(1){
fread(&value_str, 6, 6, f0);
value_int = strtol(value_str,NULL,0);
printf("0 %li\n", value_int);
fflush(stdout);
usleep(5000);
rewind(f0);
}
Hoever, the cpu usage goes up really high (20%). Is there any way to read
the analog inputs differently so that it doesn't use as much CPU? Someone
suggested "DMA" but I'm completely lost on that regard...
Any help will be appreciated.
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