Lpc2000

--- In lpc2000@yahoogroups.com, "killtheclock" <kurt.westphal@g...> 
wrote:

> I have an olimex lpc2106-mt pcb and try to program a PWM without 
> success. The Docu is not especially detailed (I think). I tried a 
lot 
> of register settings(for hours). All I get is a single 88.64 ms 
pulse 
> on PWM4 at reset that does not change with the match register or 
pre-
> scaler value.
> 
> This code is one example that illustrates my understanding of that 
> thing:
> //testing PWM4
>   PINSEL0 |= 0x20000;   // select pin 0.08 PWM4 function
>   PWM_PR  = 0x0000;    // max prescale counter value
>   PWM_MCR = 0x0002;   // reset when PWMMR0 matches
>   PWM_PCR = 0x1000;   // PWM4 enable, single edge
>   PWM_MR0 = 0x0f00;    // match register trigger value
>   PWM_TCR = 0x0009;    // set the TC counter and enable the PWMs
> 
> I would expect a 1.92 kHz frequency from that...
> Obviously I do something completly wrong.

You also need to set PWM_MR4, and then PWM_LER before the PWM_MRx 
values take effect.

Karl Olsen