Re: [Gumstix-users] PWM with gumstix

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Hi Grahame, 
 
Sweet! 
I should have thought about looking at the pxaregs source. 
 
I *just* got it working using mmap straight, using pxaregs is cleaner
though. 
 
best 
Anders 
 
 
Grahame Jordan wrote:
<blockquote cite="mid...@th..." type="cite">
 <pre wrap="">HI,

I am using pxaregs from the build_root to set up PWM.

I had to include it as an object and remove static from the functions I 
needed.

In Makefile I included it into my objects

PXAREGS             = $(PWD)/pxaregs
OBJS = \
    xxx.o          \
    xxy.o           \
    pxaregs.o  

In the C Program somthing like this:

typedef unsigned int u32;

void init_PWM()
{

        setreg("GAFR0U_16", (u32)2);            // Set GPIO16 alternate 
function of PWM0
        setreg("GPDR0_16", (u32)1);             // Set GPIO16 as an output
        setreg("PWMPERVAL0", (u32)375);         // Set PWM0 period to 375
        setreg("PWMCTL0_PRESCALE", (u32)0);     // Set PWM0 prescale to
        setreg("PWMCTL0_SD", (u32)0);           // Graceful shutdown if PWM0 
is disabled
        setreg("PWMDUTY0_FDCYCLE", (u32)0);     // Set this to zero or output 
will be held High
        setreg("PWMDUTY0_DCYCLE", (u32)0);      // Initialize PWM1 as zero for 
now
        setreg("CKEN_0", (u32)1);               // Turn on PWM1 clock

}

Cheers

Grahame Jordan

On Thu, 22 Jun 2006 19:41, Anders Wallsson wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">Hi,

I wasnt able to find any real example in the archives. Could anyone be
kind to point me in the right direction or send me some c code?

best
Anders

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