RE: [microblaze-uclinux] Timer (PWM) kernel module problem

["Radde, Jarno" <jarno.radde@xxxxxxx>]

Hi Jose

> From: Jose Torres

> However the output I get when I read is not the same: 
> Writing Register 00000000 on Timer instance 0 @ BaseAddress: 41C20000
| Value = 00000656
> Reading Register 00000000 on Timer instance 0 @ BaseAddress: 41C20000
| Value = 000007D6
> Writing Register 00000010 on Timer instance 0 @ BaseAddress: 41C20000
| Value = 00000656 
> Reading Register 00000010 on Timer instance 0 @ BaseAddress: 41C20000
| Value = 00000000

> I have used the xilinx_gpio code as a guideline while writing my own
code and I have made 
> sure to modify the code provided by xilinx to use u32 instead of
Xuint32. 

> Can anyone provide assistance as to why it is not writing 0x00000656
as it should? I have 
> been battling this problem for weeks now and have run out of
solutions.

Hm, I am not really sure if you have the same problem I had. I was using
the GPIO expansion header on my board. The registers are tri-state
registers and therefore you have to set the direction before you can
write to them.

In case of my expansion header the base adress itself was the tri-state
"state" which had to be set to 0 to work as "output" and base adress +
32 bits was the register with the header "pins".

HTH and sorry if I'm completely wrong

Jarno Radde

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