Re: gpiolib on at91

[Joe <zentrale.at.work@xxxxxxxxx>]

Bill Gatliff schrieb:
> Joe wrote:
>> Hi all!
>>
>>  From what i've read on the ML, Ryan Mallon ported the gpiolib to AT91 
>> platform (many thanks), but could maybe point me someone to an 
>> example/appropriate documentation on how to implement the use of the 
>> gpiolib into the board support file?
>> Grepping and google failed me unfortunately.
>> The hardware is nothing fancy, just 4 dip-switches intended to set some 
>> configuration options, and therefore i think the cleanest approach would 
>> be to be able to see "1" or "0" in somewhere sysfs/gpio.
>> Are there any hints maybe?
>>   
> 
> Echo the number of the gpio pin to /sys/class/gpio/export, and then a
> directory should appear under /sys/class/gpio.  Pins default to input,
> so you should be able to cat /sys/class/gpio/gpioNNN/value to see the
> state of the pin.
> 
> 
> b.g.
> 

/sys/class/gpio shows the described behaviour concerning the gpioNNN 
subdirectory, and the file direction inside says "in" accordingly. 
However, "value" does not change.
I've got four switches connected to lines PB10-PB13, which should map to 
gpio42-gpio45 when banks are 32 each.
at91rm9200_initialize(18432000, PQFP) and at91_gpio_init(...) are called 
correctly on startup.
So might there be another thing i've stupidly missed?

(hardware is functional and 100% tested)
-- 
Sepp "ZaP" Holzmayr

please reply to: zentrale.at.work@xxxxxxxxx
"Never underestimate the bandwidth of a freight train full of DAT tapes. 
Only the round-trip is a little suboptimal."

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