LPC MicrocontrollersのトピックRe: PWM CONFIGURATION IN LPC 804

PWM CONFIGURATION IN LPC 804

Arularasan — Tue, 20 Jun 2023 17:05:00 GMT

HI I am trying to generate pwm in P0_24 in LPC804 Microcontroler.

If there are any changes in my configuration, update me

int main()

{

SYSCON->PRESETCTRL0 |= 1 << 25;

SYSCON->SYSAHBCLKCTRL0 |= 1<<7;

SWM0->PINASSIGN.PINASSIGN4 = 0X18; // P0_24 PIN SELECTED

SYSCON->SYSAHBCLKCTRL0 |= 0<<7;

CTIMER->TCR |= 1 << 1;

CTIMER->PR = 0x00U;

CTIMER->MCR |= 1 << 0 | 1 << 1;

CTIMER->MR[0] =100;

CTIMER->MSR[0]=100;

CTIMER->PWMC |= 0<<1;

CTIMER->TCR |= 1<<0 | 1<<1;

while(1)
{
CTIMER->MR[1] =50;
CTIMER->MSR[1]=50;
}

}

Re: PWM CONFIGURATION IN LPC 804

Alice_Yang — Wed, 21 Jun 2023 02:35:26 GMT

Hello @Arularasan

What about the issue with your project?

About PWM, strongly recommend you the PWM demo under SDK.

Download SDK from: https://mcuxpresso.nxp.com/en/select

Alice

Re: PWM CONFIGURATION IN LPC 804

Arularasan — Wed, 21 Jun 2023 04:15:37 GMT

@Alice_Yang

The pwm pulse is not generated, please update me if there are any changes in the configuration below

int main()

{

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

/* 2 */ SYSCON->PRESETCTRL0 |= 1 << 25; // CTIMER reset control // Clear the CTIMER reset.

/* 3 */ // Pins: Select timer pins through switch matrix.

/* 4 */ // SWM0->PINASSIGN_DATA[4] | ;

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

SWM0->PINASSIGN.PINASSIGN4 = 0X18;// P0_24 PIN SELECTED

SYSCON->SYSAHBCLKCTRL0 |= 0<<7; //DISABLE clock for switch matrix

/* 5 */ CTIMER->TCR |= 1 << 1;/*Enabled. The Timer Counter and the Prescale Counter are synchronously reset on the

next positive edge of the APB bus clock. The counters remain reset until TCR[1] is

returned to zero*/

CTIMER->PR = 0xFFFFFFFFU;

/* 6 */ CTIMER->MCR |= 1 << 0 | 1 << 1; // Interrupt on MR0: an interrupt is generated when MR0 matches the value in the TC

// Reset on MR0: the TC will be reset if MR0 matches it. 0 = disabled. 1 = enabled

/* 7 */ CTIMER->MR[0] =100;//Timer counter match value

/* 8 */ CTIMER->MSR[0]=100; //Timer counter match shadow value

// START COUNT

/* 9 */ CTIMER->PWMC |= 0<<1;//PWM. PWM mode is enabled for CTIMER_MAT0.

/* 10 */ CTIMER->TCR |= 1<<0 | 1<<1;// Enabled. The Timer Counter and Prescale Counter are enabled.

//Enabled. The Timer Counter and the Prescale Counter are synchronously reset on the

//next positive edge of the APB bus clock. The counters remain reset until TCR[1] is

//returned to zero

// while(1)

// {

/* 7 */ CTIMER->MR[1] =50;//Timer counter match value

/* 8 */ CTIMER->MSR[1]=50; //Timer counter match shadow value

// }

}

Re: PWM CONFIGURATION IN LPC 804

Alice_Yang — Sun, 25 Jun 2023 10:06:44 GMT

Hello @Arularasan

Please first confirm the PWM demo under SDK can generate PWM signal on your board, then development based on it,

that can speeds up your development.

Alice