Re: [ts-7000] Re: PWM (Uploaded file ts7500_pwm)

[Ferrug <>]

Wow, you are the best ..
It worked very well! And you asked if it will help me .. This saved me! hehe

This should get you ..
Now, not wanting to abuse, but can you help me with some questions?
To overwrite the pads you just erased the past? Direct the file .Lpf ?

The maximum frequency is 75MHz we can use?

Thanks a lot..
Fabio

2010/11/15 akikem <>

 

Fabio,
I just uploaded for the group a rar called ts7500_pwm.rar. This one contains the source to generate a ts7500 core without the CAN part, and with a PWM enabled, at 75 Khz. You can vary it's duty cicle accessing 0x6A register in the memory.
It uses the 75Mhz clock to generate it, so it counts from 0 to 1000, to generate 75Khz signal.
The 0 bit in the 0x6A will enable it, while bit 11 to 0, will change duty cicle. For example, if you want a 50% duty cicle, you would use:

ts7500ctl --address --poke16=0x03E9
if you want to disable it, you can use:
ts7500ctl --address --poke16=0x03E8

I also include the other files I am using for the development I need. They try to control frequency, duty cicle, and enable in less wishbone memory bytes. But Im still missing something.
You can actually add easily another pwm by just adding another instance of generador_pwm in the syscon core, and redirecting the output to pwm[2]. But you will have to use another memory segment to be able to modify the duty cicle within Linux.

I override the functions of pin 21 to 36 and 40. I add some pad outputs, and just didn't use the dio_pads that were already there. You can see the PWM output at PIN_31 at the TS7500.

Hope this is help on your project, and well, if anyone wish and could improve the code, it would be great. I just deleted CAN because I needed more space for the other code. But I just wish I didn't erased anything more else.. at least my ts7500 is working ok with my needs.

Regards,
Enrique

--- In ts-7000%40yahoogroups.com, Ferrug <> wrote:
>
> Humm, I see.
> I'll try here as well, and if I get something I notice.
> thanks again.
>
> Fabio
>
>
> 2010/11/12 David Preza H <>
>
> >
> >
> >
> > That's were Wishbone enters. As far as I know (hope someone with more
> > knowledge could give us some light), TS-7500 FPGA creates a 256*16 bits
> > memory access, which can be used with Linux using the test program ts7500ctl
> > (for example, ts7500ctl --address=0x6A --poke32=0xffff). This will write a
> > 0xffff value in the address 0x6a, which is actually the one FPGA uses to
> > change the output value for pins 36 to 21.
> >
> > This is exactly what I am trying, to override the functionality of pin 36
> > to 30, but I haven't tested enough, and the code is still failing (not the
> > PWM code, but the integration with the wishbone).
> >
> > I have some work to do, but I'll try to test today later, or in the
> > weekend.
> >
> > Regards,
> > Enrique
> >
> >
> >
>
>
>
> --
> "Dê-me uma alavanca e um bom ponto de apoio que moverei o mundo." Archimedes
>

-- 
"Dê-me uma alavanca e um bom ponto de apoio que moverei o mundo." Archimedes

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