Well..... the W836327HF seems to be quite complex regarding the GPIO,
and the datasheet does not offer much help. It does not look like a
simple change of code to make the generic CS5536 code work with it.
Bart Jooris wrote:
Hi Josh and Tom,
To control the leds|buzzer|resetbutton on the alix3c3 I wrote a
"generic" program to control the GPIO of the CS5536.
I don't use the cs5536_gpio and you have to be root to use it (calls
iopl).
It's powerfull, please check the diagram of the ALIX before changing
the mode of a GPIO pin and
have a look at page 480- of the CS5536 datasheet.
I use it since a month now and it looks stable.
Invoking the program without params shows a pretty good help
[EMAIL PROTECTED]:~# /usr/w-iLab.t/gpiostat
(c) 2008 Ghent University [EMAIL PROTECTED]
Syntax: /usr/w-iLab.t/gpiostat bit [parameterstring]
where bit is in the range from 0 to 31
if '-' is part of the string then Regs will be read back
lower case will clear the bit, upper case will set the bit
[v|V] Output Value
[o|O] Output Enable
[d|D] Output Open Drain Enable
[r|R] Output Invert Enable
[a|A] Output Auxiliairy 1 Select
[b|B] Output Auxiliairy 2 Select
[h|H] Output Pull-Up Enable
[l|L] Output Pull-Down Enable
[i|I] Input Enable
[u|U] Input Invert Enable
[f|F] Input Filter Enable
[c|C] Input Event Count Enable
[.|.] Input Read Back
[s|S] Input Auxiliairy 1 Select
[k|K] Lock Enable
[i|I] Input Enable
[p|P] Input Positive Edge Enable
[n|N] Input Negative Edge Enable
[x|X] Input Positive Edge Status
[y|Y] Input Negative Edge Status
For example:
to configure led0 on the ALIX3c3 which is connected to GPIO pin 6 of
the CS5536 you invoke
gpiostat 6 abiOD
read it like this
pin6 with (NO Output Auxiliairy 1 Select & NO Output Auxiliairy 2
Select & NO Input Enable & Output Enable & Output Open Drain Enable)
gpiostat will only show the registers it changed...
to toggle the led you invoke
gpiostat 6 V
sleep 1
gpiostat 6 v
...
I attached both source and bin (as it can be hard to compile, you need
a least the kernel-headers... CentOS 4.5 box can do the trick).
Hope it works for you,
Cheers,
Bart Jooris
Researcher
IBBT-IBCN research group-Ghent University
Josh F wrote:
I see cs5535_gpio in modprobe and in dmesg, and it loads fine, but I
see no way to use it. I also have not figured out how to use the
gpio pins directly, which would also be fine. In the BIOS, it has
settings to make each pin either input or output.
If anyone has any more insight to controlling gpio, please let us all
know!
Tom Billiet wrote:
Hi,
Interesting question, I haven't found this out either. The best I
could find was that the geode seems to control the gpio pins
directly, so you have to search how to control gpio pins on a geode
processor I think. But I must say I did not come anything further.
Kind regards,
Tom
----- Original Message -----
From: Josh Fields
Time: 28-09-08 01:52
Does anyone have some quick examples to use the GPIO header on the
ALIX.1C?
For example, how to turn on/off an output pin, and how to read an
input pin?
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