Lpc2000

I found two issues.  First is that I missed initializing the
PWMCR_PWMENABLE bit.  Second is that when I was changing the match
register value, I was setting the latch bit.

Matt

--- In lpc2000@yahoogroups.com, "MattKav" <mkavalauskas@b...> wrote:
> I am confused about setting up the PWM code.  Below is my
> initialization code.  Here is my confustion...
> When I set PWMMR4 to 0, I get a very short logic 1 output.  I would
> expect it to always be 0.
> When I set PWMMR4 to 100, it is always logic 0 output.  I would expect
> it to always be 1.
> When I set PWMMR4 to 101, it is always logic 1 output as expected.
> 
> Am I doing something wrong, or do I have wrong expectations?
> 
> Thanks,
> Matt
> 
> // PWM4
> PINSEL0 = (PINSEL0 & ~PWM4_PINMASK) | PWM4_PINSEL;
> 
> //PWMTCR = 0x5;
> PWMTCR = PWMCR_RESET; // reset & disable timer 1
> PWMPR = PWM_PCLK_DIV - 1; // set the prescale divider ( 3-1 = 2)
> 
> PWMMCR = PWM_MR0_R; // reset PWM0 when a match occurs
> PWMPCR = PWM_ENO4; // enable PWM4 output
> 
> PWMMR0 = 100; // reset PWM0 every 100 ticks
> PWMMR4 = 50; // 50% duty cycle on PWM4
> PWMLER = PWM_ENL4; // enable the pwm match register values
> 
> PWMTCR = PWMCR_ENABLE; // enable pwm