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iboguslavsky / pwm-sunxi-opi0

PWM driver for H2+ Sunxi SoC
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Editing prescale values #4

Closed mtanwr closed 7 years ago

mtanwr commented 7 years ago

Thank you @iboguslavsky for creating this repo for OPI0.

I am having trouble understanding how to edit the prescale values. For example, if I want to specify PRESCALE_DIV_NO, then do I write the hex value 0x0f in prescale file? Or do I need to convert that to some other format? Like decimal, which in this case would be 15.

When I try to write 0x0f, then it becomes 0 and saves it like that. It seems it only takes decimal values of 0 to 15 as valid arguments.

iboguslavsky commented 7 years ago

Assuming you first write "1" to "run" file (you have to do it before you write any values to "prescale" file) - then yes, you just write a numeric value into "prescale" file (and not a string representation of it, like "0x0f"). You can, indeed, use decimal representation (15), hex (0x0f), or any other - as long as they are numeric values, not strings,

Share your your code sample here if you need additional help.

mtanwr commented 7 years ago

Thanks! I got the pwm running with no problems. I don't have any code yet, as I was just testing OPI pwm through command line, but I'll share if I have any further problems.