On 11/26/2014 10:47 AM, Mike Looijmans wrote:
On 11/25/2014 03:03 PM, Lars-Peter Clausen wrote:
On 11/25/2014 09:12 AM, Mike Looijmans wrote:
After this commit:
iio:adc:ad799x: Write default config on probe and reset alert status on
probe
writing ALERT_EN and BUSY_ALERT to the chip config register clears
pending alerts, BUSY_ALERT is cleared when reading back the register
The AD7999 on our board no longer functions, reading the in_voltage*_raw
sysfiles always returns "255" after this.
I reverted the commit, and that fixed the problem for me.
I suspect that there is something going wrong when reading back the config
register, can you check the attached patch and see what the output is?
Thanks,
- Lars
The attached patch delivered the following output (using the current head
code):
ad799x 1-0029: config: b 0
Yea, kind of what I expected based on your description. Looking at the
datasheet it seems the ad7999 doesn't even support register read back which
would explain the issue. I'll try to find a board and see if I can fix it.
- Lars
--
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
