Re: [microblaze-uclinux] GPIOs

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Raul,

Raul Camaras wrote:

> I am not being able to write GPIOs from uClinux.
> 
> I am using an old program somebody wrote for this forum(source
> attached).

> My instance in mhs file is:
> 
> BEGIN opb_gpio
>  PARAMETER INSTANCE = gpio_test
>  PARAMETER HW_VER = 3.01.b
>  PARAMETER C_IS_DUAL = 0
>  PARAMETER C_GPIO_WIDTH = 2
>  PARAMETER C_IS_BIDIR = 1
>  PARAMETER C_BASEADDR = 0xFFFF6400
>  PARAMETER C_HIGHADDR = 0xFFFF65FF
>  BUS_INTERFACE SOPB = opb_v20_0
>  PORT GPIO_IO = gpio_test_io
> END
> 
> The entry on mss file is:
> 
> BEGIN DRIVER
>  PARAMETER DRIVER_NAME = gpio
>  PARAMETER DRIVER_VER = 2.11.a
>  PARAMETER HW_INSTANCE = gpio_test
> END
> 
> When booting kernel 2.4, gpios are there:
> ...
> Starting kswapd
> xgpio #0 at 0xFFFF5400 mapped to 0xFFFF5400
> xgpio #1 at 0xFFFF6400 mapped to 0xFFFF6400
> Xilinx GPIO registered
> ...
> 
> I use Xilinx tools 9.2, does anybody know if there are some problems
> when
> using the hw/sw versions I am using??

No, it looks ok.  Make sure the GPIO driver is selected in menuconfig.
You should get similar messages on kernel boot, showing GPIOs detected.

> For the kernel 2.6 I guess I must rewrite the test program, looking at
> the xgpio
> driver: adapter.c, etc... Did it someone already?

Use the gpio-test application in petalinux-dist/user/gpio-test - it is
modified to also support 2.6 kernel GPIO driver.

Then you can do

gpio-test -d /dev/xgpio1 -k

for example.

Regards,

John

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