PWM CONFIGURATION IN LPC 804

Arularasan — Wed, 21 Jun 2023 15:17:29 GMT

PWM configuration not working!

I need to configure MR3 as period and MR0 as duty cycle

(50 % on time 50 % off time continuous pulse)

Is there any correction in my configuration below

int main(void)

{

SYSCON->SYSAHBCLKCTRL0 |= 1 << 25 ; // Enables clock for CTIMER0.

SYSCON->PRESETCTRL0 |= 1 << 25; // CTIMER reset control // Clear the CTIMER reset.

SYSCON->SYSAHBCLKCTRL0 |= 1<<7; //Enables clock for switch matrix

SWM0->PINASSIGN.PINASSIGN4 = (0X18) << 24 ; //0X18;// P0_24 PIN SELECTED

SYSCON->SYSAHBCLKCTRL0 &= ~(1<<7); //DISABLE clock for switch matrix.

CTIMER->TCR |= 1 << 1; //The Timer Counter and the Presale Counter are synchronously reset on the next positive edge of the APB bus clock

CTIMER->PR = 0X00; //Presale counter value

CTIMER->MCR |= 1 << 9 | 1 << 10 | 1 << 27 | 1 << 0 | 1 << 1;

CTIMER->MR[3] =10000;//Timer counter match value

CTIMER->MSR[3]=10000; //Timer counter match shadow value

CTIMER->MR[0] =5000;//Timer counter match value

CTIMER->MSR[0]=5000; //Timer counter match shadow value

CTIMER->PWMC |= 1<<3;//PWM. PWM mode is enabled for CTIMER_MAT0.

CTIMER->TCR |= 1<<0 ;//Enabled. The Timer Counter and Presale Counter are enabled

while(1);

}

Re: PWM CONFIGURATION IN LPC 804

RaRo — Fri, 23 Jun 2023 16:46:26 GMT

Hello @Arularasan,

Could you please try out using the following arrangement to your code?

. CTIMER->PR = 0X00; CTIMER->PWMC |= 1<<3; CTIMER->MCR |= 1 << 9 | 1 << 10 | 1 << 27 | 1 << 0 | 1 << 1; CTIMER->MR[0] =5000; CTIMER->MR[3] =10000; CTIMER->TCR |= 1<<0 ; .

Also, there is a similar question on this post: LPC804 - PWM pulse generation - NXP Community, could you please take a look at it?

Best regards, Raul.

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PWM CONFIGURATION IN LPC 804

Re: PWM CONFIGURATION IN LPC 804