On 20/10/14 19:34, H Hartley Sweeten wrote:
The apci3120_reset() function is called at the end of the (*auto_attach) and
with the (*detach) is called to unload the driver. Part of this function
resets all the analog output channels to 0V.
There are two problems with this.
1) Only the APCI-3120 has analog outputs, the APCI-3001 does not.
2) The DA_READY bit in the status register needs to be checked before each
write to update the analog outputs. It's unknown what the DA_READY bit
does on the APCI-3001 board.
Just remove the analog output reset to avoid any problems.
A minor niggle is that the readback value for a channel won't match the
voltage until the channel is written. Maybe the code for writing to the
channel and setting the readback value could be factored out of the
insn_write handler and called for each channel during auto_attach
(ignoring any timeout errors). This could be done after this patch series.
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=-
-=( Web: http://www.mev.co.uk/ )=-
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