LPC 55s16 PWM

[Arularasan]

HI  I am Trying to generate PWM pulse in LPC 55s16 MCU 

"clock was not working"

as per User manual 

Select clock source. See Section 4.5.27 “CTimer 0 clock source select” to
Section 4.5.31 “CTimer 4 clock source select register”

Table 68. CTimer 2 clock source select (CTIMERCLKSEL2, offset = 0x274) bit description

" SYSCON->CTIMERCLKSELX[2] |= 0x00; " // CTimer 2 clock source select register .

but above register is not working.

So kindly update any correction in my configuration below

int main(void)
{
      
  SYSCON->CTIMERCLKSELX[2] |= 0x00; // CTimer 2 clock source select register

IOCON->PIO[1][6] = 0X003; // FUNC = 3 // CTIMER2_MAT1
SYSCON->AHBCLKCTRLX[1] = 1 << 22 ; // Enables the clock for the Timer 2.
SYSCON->PRESETCTRLSET[1] = 1 << 22 ; // Timer 2 reset control.
SYSCON->PRESETCTRLCLR[1] = 1 << 22 ; //clears the corresponding position in PRESETCTRL1.
CTIMER->CTCR = 0X00;//Timer mode. Incremented every rising APB bus clock edge
CTIMER->PR = 0X00;//The pre-scale counter is incremented on every APB bus clock
CTIMER->PWMC = 1 << 1 ;// PWM mode is enabled for CTIMERn_MAT1.
CTIMER->MCR = 1 << 10 ;// Reset on MR3: the TC will be reset if MR3 matches it.
CTIMER->MR[3] = 96000000 ;
CTIMER->MR[1] = 48000000 ;
CTIMER->TCR |= 1 << 0 ; //Enabled. The timer counter and pre-scale counter are enabled
while(1);
}

[ZhangJennie]

Hi Arularasan 

Can you please let us know your SDK version and demo project with configurations?

Thanks,

Jun Zhang

[Arularasan]

1 . SDK version : SDK_2.X_LPC_Xpresso5  2.13.0

2  .driver example : Ctimer_PWM_example  

3 .demo project with configurations are below ↓

"clock was not working"

as per User manual 

Select clock source. See Section 4.5.27 “CTimer 0 clock source select” to
Section 4.5.31 “CTimer 4 clock source select register”

Table 68. CTimer 2 clock source select (CTIMERCLKSEL2, offset = 0x274) bit description

" SYSCON->CTIMERCLKSELX[2] |= 0x00; " // CTimer 2 clock source select register .

but above register is not working.

So kindly update any correction in my configuration below

int main(void)
{
      
  SYSCON->CTIMERCLKSELX[2] |= 0x00; // CTimer 2 clock source select register

IOCON->PIO[1][6] = 0X003; // FUNC = 3 // CTIMER2_MAT1
SYSCON->AHBCLKCTRLX[1] = 1 << 22 ; // Enables the clock for the Timer 2.
SYSCON->PRESETCTRLSET[1] = 1 << 22 ; // Timer 2 reset control.
SYSCON->PRESETCTRLCLR[1] = 1 << 22 ; //clears the corresponding position in PRESETCTRL1.
CTIMER->CTCR = 0X00;//Timer mode. Incremented every rising APB bus clock edge
CTIMER->PR = 0X00;//The pre-scale counter is incremented on every APB bus clock
CTIMER->PWMC = 1 << 1 ;// PWM mode is enabled for CTIMERn_MAT1.
CTIMER->MCR = 1 << 10 ;// Reset on MR3: the TC will be reset if MR3 matches it.
CTIMER->MR[3] = 96000000 ;
CTIMER->MR[1] = 48000000 ;
CTIMER->TCR |= 1 << 0 ; //Enabled. The timer counter and pre-scale counter are enabled
while(1);
}

[ZhangJennie]

Hi

So you want to change clock source as main clock

Thus configure the CTIMER2 clock source as main clock in clock configuration tool. try how it works.

Have a nice day.

Jun Zhang

[Arularasan]

CTIMER2 clock source as main clock is not working .

[ZhangJennie]

I am using ctimer_pwm_interrupt_example demo.

add CLOCK_AttachClk(kMAIN_CLK_to_CTIMER2); after BOARD_InitBootClocks();

BOARD_InitBootPins();
BOARD_InitBootClocks();
CLOCK_AttachClk(kMAIN_CLK_to_CTIMER2);
BOARD_InitDebugConsole();

ctimer works well.

Please test it.

[Arularasan]

@ErichStyger  Yes, the PWM example in the MCUXpresso SDK is Working.
But the driver configuration I write doesn't work...

what is the problem in these register  SYSCON->CTIMERCLKSELX[2] |= 0x00; // CTimer 2 clock source select register

Please edit and update ....

[ErichStyger]

Hi @Arularasan ,

have you checked the PWM example in the MCUXpresso SDK?