On Wed, Aug 19, 2015 at 02:34:39PM -0700, Greg Wilson-Lindberg wrote:
>
> So, in that case, can I just open it once and leave it open?
Yes.
> Is it reading from a buffer, or is it reading what is current in the ADC?
It is the current reading.
> Can I just set up a timer to get readings to average then?
Sure.
Here are some helper functions:
int iio_adc_open_channel(int dev_num, int chan_num)
{
char filename[255];
sprintf(filename, "/sys/bus/iio/devices/iio:device%d/in_voltage%d_raw",
dev_num, chan_num);
return open(filename, O_RDONLY);
}
int iio_adc_read_channel(int fd)
{
int count;
char buffer[255];
int value = -1;
lseek(fd,0,SEEK_SET);
count = read(fd, buffer, 255);
if (count > 0)
value = strtoul(buffer, NULL, 10);
return value;
}
Example usage:
int fd;
.
.
fd = iio_adc_open_channel(0, 4);
.
.
while (1)
{
printf("ADC = %x\n", iio_adc_read_channel(fd));
}
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
