PWM

kavya_akas — Fri, 15 Dec 2023 04:18:03 GMT

Hi, I am using the LPC55s16 microcontroller in the scenario. I am working with both timers and PWM in CTIMER0 peripherals, but I didn't use the same time because the MCR register bits are the same. Is it possible to connect those two peripherals?

Here I attached the code.

PWM code

SYSCON->SYSTICKCLKSELX[0] |=0X02; // Oscillator 32 kHz clock.

SYSCON->CTIMERCLKSELX[0] |= 0x00; // 0 Main clock.

IOCON->PIO[1][2]= 0X003; // FUNC = 3 // CTIMER0_MAT1

SYSCON->AHBCLKCTRLX[1] = 1 << 26 ; // Enables the clock for the Timer 0.

SYSCON->PRESETCTRLSET[1] = 1 << 26 ; // Timer 0 reset control.

SYSCON->PRESETCTRLCLR[1] = 1 << 26 ; //clears the corresponding position in PRESETCTRL1.

CTIMER0->CTCR = 0X00;//Timer mode. Incremented every rising APB bus clock edge

CTIMER0->PR = 0X00;//The pre-scale counter is incremented on every APB bus clock

CTIMER0->PWMC = 1 << 3 ;// PWM mode is enabled for CTIMERn_MAT3.

CTIMER0->MCR = 1 << 4 ;// Reset on MR1: the TC will be reset if MR1 matches it.

CTIMER0->MR[3] =48000; //period

CTIMER0->MR[1] =24000; //duty cycle

CTIMER0->TCR |= 1 << 0; //Enabled. The timer counter and pre-scale counter are enabled

TIMER code

SYSCON->AHBCLKCTRLSET[1] = 1<<27; // Enables the clock for the Timer 1.

SYSCON->CTIMERCLKSEL.CTIMERCLKSEL1 = 0x00;

CTIMER1->CTCR = 0x00;

CTIMER1->TC = 0x00;

CTIMER1->PR = 0x00;

CTIMER1->PC = 0x00;

CTIMER1->MR[1] = MR_VALUE;//96000000;

CTIMER1->MCR |= 1U<<3; // Interrupt on Match1 compare

CTIMER1->MCR |= 1U<<4; // Reset timer on Match 1.

CTIMER1->TCR |= 1U<<1; // Manually Reset Timer1

CTIMER1->TCR &= ~(1U<<1); // Stop resetting the timer.

CTIMER1->IR |= 0xFF; // Clear MR1 interrupt flag

CTIMER1->TCR |= 1<<0; // Start timer

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PWM

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