> -----Original Message----- > From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf > Of Michael Welling > Sent: Wednesday, August 19, 2015 2:43 PM > To: Greg Wilson-Lindberg > Cc: Daniel Baluta; linux-iio@xxxxxxxxxxxxxxx > Subject: Re: BBB IIO ADC access not working > > 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)); } > > I converted to using this interface and left the system running overnight and the touch screen was locked up this morning.-- 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
