Re: [Gumstix-users] UCB1400 ADC

[Neil C. <nc...@ba...>]

Just to summarise.

I have modified the ucb1x00-assabet.c file (attached)

this gives access to all 4 ADC channels rather than just 3. They are 
also named ADC0, ADC1, ADC2 and ADC3 to make more sense than the old 
names of vcharger, vbatt, batt_temp

so to install:

from buildroot:

1.
make ARCH=arm CROSS_COMPILE='pwd'/../staging_dir/arm-linux- menuconfig

Device drivers - Input device support - Touchscreens - UCB1400 
Touchscreen support
save

2.
copy the attached file to build_arm_nofpu/linux-2.6.18gum/drivers/mfd 
directory &
modify the /Makefile/ in the same directory to include 
/ucb1x00-assabet.o/ - attach this to the UCB1400 line with the other *.o's

3.
make ARCH=arm CROSS_COMPILE='pwd'/../staging_dir/arm-linux-

4.
If it fails to make first time around then run make again! Not sure why 
this is the case! I don't understand why this might be. Perhaps make 
dependencies and order of execution?

5.
cd <gumstix-buildroot>
make

6.
When you have transferred the image to the gumstix then:

# modprobe snd_pxa2xx_ac97
# modprobe ucb1x00-core
# modprobe ucb1x00-assabet

you can read the values by:

# cat /sys/class/ucb1x00/ucb1x00/ADn

where n =1..3

you can also access the 10 IO lines with:

# echo "GPIO out set" > /proc/gpio/UCB1400-0-n

where n =0..9

out and set can be changed for /in/ and /clear/ as desired!
or use
# cat /proc/gpio/UCB1400-0-n
to read from the port.

Hope this is of some help to someone else using GPSstix.
BTW - each ADC is 10 bits and can handle voltages up to 7.5V peak.

Neil


Neil Cobbett wrote:
> HI Pascal,
>
> I did /make/ again and this time no errors! It's working!
>
> Perhaps the order in which make runs needs tweaking. Second time through 
> it passed with no errors. I also made some modules rather than built in 
> by running /make menuconfig./ Not sure what the exact fix was.
>
> Now have ADC working 0 to 7.5V Peak on three channels. Now need to 
> modify the ucb1x00-assabet.c to get all 4 channels. Also rename them to 
> ADC0-4 rather than the vcharger, vbatt, batt_temp.
>
> Thanks for your help!
>
> Neil
>
>
> Pascal wrote:
>   
>> Neil Cobbett wrote:
>>   
>>     
>>> I get:
>>>     
>>>       
>>   
>>     
>>> CONFIG_TOUCHSCREEN_UCB1400=y
>>> CONFIG_SND_AC97_BUS=y
>>>     
>>>       
>> So you have the touchscreen driver configured as built-in,
>> not as a module.  I have no idea why this affects rtc-lib.c,
>> but you could try to fix that in menuconfig.
>>
>> Pascal
>>
>>
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