Hi John,
Try using channel 1. It may be set up where the first channel is 1 and not
0.
Not sure what you mean...
I'm actually not clear how many devices I should have:
$ grep "GPIO.*BASEADDR"
arch/ppc/platforms/4xx/xparameters/xparameters_ml405.h
#define XPAR_GPIO_0_BASEADDR XPAR_LEDS_4BIT_BASEADDR
#define XPAR_GPIO_1_BASEADDR XPAR_LEDS_POSITIONS_BASEADDR
#define XPAR_GPIO_2_BASEADDR XPAR_PUSH_BUTTONS_POSITION_BASEADDR
But depending on the examples I look at, they define either:
crw-rw-rw- 1 root root 10, 185 May 26 13:49 xgpio
or:
crw-rw-rw- 1 root root 10, 185 May 26 13:18 xgpio0
crw-rw-rw- 1 root root 10, 186 May 26 13:18 xgpio1
crw-rw-rw- 1 root root 10, 187 May 26 13:18 xgpio2
If that is the former, I see the code uses:
gpio_ioctl.chan=0;
And I guess that's what you are refering to, right ?
Putting 1 gives me a working program, but no LED lights up and the buttons
are always shown at 0.
Putting 0 gives a nice core dump as in my previous msg.
Putting 2 locks up the system.
And... I don't see how the code manages to read/wite all 3 GPIOs with only
two IOCTL calls. Shouldn't they be 3 different calls using different
addresses ?!? Argh, this complete lack of documentation in maddening. Not
everything can be understood from reading the source.
Thanks.
--
Guillaume Dargaud
http://www.gdargaud.net/
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