Re: [Gumstix-users] Controlling all 4 PWM's

[zachlac <zla...@gm...>]

That didn't seem to fix the problem.  I can find the other values (TCLR,
TLDR, etc) in the reference manual, but not the MUX value.  Where is that
located?

Thanks.

Zach


Frank Agius wrote:
> 
> On 5/27/2010 10:26 AM, zachlac wrote:
>>
>> I cannot seem to control all four PWM's.  I can get PWM's 8, 9, and 11 to
>> function, but not 10, using the following PWM code:
>>
>> [code]
>> #define PWM08_TCLR (0x4903e024)
>> #define PWM09_TCLR (0x49040024)
>> #define PWM10_TCLR (0x48086024)
>> #define PWM11_TCLR (0x48088024)
>> #define PWM08_MUX  0x48002178,0x01020000
>> #define PWM09_MUX  0x48002174,0x00000102
>> #define PWM10_MUX  0x48002174,0x00000102
>> #define PWM11_MUX  0x48002178,0x01020102
>> #define PWM_CLK  (0x48004a40)
>> #define PWM08_TLDR (0x4903e02c)
>> #define PWM09_TLDR (0x4904002c)
>> #define PWM10_TLDR (0x4808602c)
>> #define PWM11_TLDR (0x4808802c)
>> #define PWM08_TMAR (0x4903e038)
>> #define PWM09_TMAR (0x49040038)
>> #define PWM10_TMAR (0x48086038)
>> #define PWM11_TMAR (0x48088038)
>> #define PWM08_TCRR (0x4903e028)
>> #define PWM09_TCRR (0x49040028)
>> #define PWM10_TCRR (0x48086028)
>> #define PWM11_TCRR (0x48088028)
>>
>> write32Bits(PWM10_TCLR, 0x00000000);     // set gtp11_TCLR, stop the
>> timer
>> write32Bits(PWM10_MUX);                  // set mux for gpt11_pwm_evt
>> write32Bits(PWM_CLK,    0x0000038A);     // use the system clock (13MHz)
>> write32Bits(PWM10_TLDR, startValueLong); // set value for gpt11_TLDR,
>> timer
>> load
>> write32Bits(PWM10_TMAR, pulsewidthLong); // set value for gpt11_TMAR,
>> timer
>> match (set the pulse width)
>> write32Bits(PWM10_TCRR, 0xffffffff);     // set value for gpt11_TCRR,
>> timercounter
>> write32Bits(PWM10_TCLR, 0x00001843);     // set gtp11_TCLR, start the
>> timer
>> [/code]
>>
>> How can I start to debug why one of the PWM's is not working?  Has
>> anybody
>> else gotten all four working simultaneously?
>>
> 
> The define for PWM10_MUX is wrong.  it should be:
>    #define PWM10_MUX  0x48002174,0x01020000
> 
> frank
> 
> 
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