I would like to continuously read the status of an IO line on my Beaglebone
black. The code I pasted below is a section of my software looking for
rising and falling edges. Is there a way in Linux to read the status of
that line without having to open and close the same file that is faster?
The method I have below works, but only at really low frequencies.
I am trying to read the IO approx. 15kHz.
Thanks
while( buf[0]=='0' ) {
memset(adc_drdy, 0, sizeof(adc_drdy) );
if((j = fopen ( "/sys/class/gpio/gpio65/value", "r" )) == NULL) {
//printSerial("Unable to read input file");
}
else {
fgets(adc_drdy, sizeof(adc_drdy), j);
strcpy(buf, adc_drdy);
//fprintf(j, "%s", adc_drdy);
fclose(j);
}
system("echo 0 > /sys/class/gpio/gpio61/value");
printf("%c\n", buf[0]);
//if(ADC_DRDY=='1') break;
}
while( buf[0]=='1' ) {
memset(adc_drdy, 0, sizeof(adc_drdy) );
if((j = fopen ( "/sys/class/gpio/gpio65/value", "r" )) == NULL) {
//printSerial("Unable to read input file");
}
else {
fgets(adc_drdy, sizeof(adc_drdy), j);
strcpy(buf, adc_drdy);
//fprintf(j, "%s", adc_drdy);
fclose(j);
}
system("echo 1 > /sys/class/gpio/gpio61/value");
printf("%c\n", buf[0]);
//if(ADC_DRDY=='0') break;
}
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