FTM2 channel not delivering PWM

Robinwithu — Mon, 21 Oct 2013 13:57:19 GMT

Hi Everybody,

i m new to the Freescale controllers.can you please see my code and tell me why FTM2 is not working ? FTM0 is working properly.

About code:

Just trying to generate Hardware PWM in all channels of MC9S08RN16 µc.

#include <hidef.h> /* for EnableInterrupts macro */

#include "derivative.h" /* include peripheral declarations */

// Prototype Function

void main(void);

void delay();

void PWMInit(unsigned int i);

void main(void) {

unsigned int Period;

unsigned int Duty;

Period =0x120;

PWMInit(Period);

Duty = 0x90;

DisableInterrupts;

PORT_PTAOE = 0x03; /* Define PortA all Pin As Output ; one is Output and Zero is Input for Data Direction */

PORT_PTBOE = 0xFF; /* Define PortB all Pin As Output */

// PORT_PTAD = 0x00; /* Initialise the PORTA */

// PORT_PTBD = 0x00; /* Initialise The PORTB */

/* the following code segment demonstrates setting ICS to FEI mode generating 20MHz bus*/

// ICS_C1 = 0x04; /* internal reference clock to FLL */

// ICS_C2 = 0x00;

// ICS_C3 = 0x00; /* BDIV = 0, no prescalar */

while (1)

{

__RESET_WATCHDOG();

FTM0_SC=0x10; //Channel Zero PWM Timer is config for System clock ; Zero Prescaler and Counter Operates in Up counting mode

FTM2_SC=0x10;

FTM0_C0VH=(Duty>>8); //Ton Period or Duty Cycle

FTM0_C0VL=Duty;

FTM0_C1VH=(Duty>>8);

FTM0_C1VL=Duty;

FTM2_C0VH=(Duty>>8); //Ton Period or Duty Cycle

FTM2_C0VL=Duty;

FTM2_C1VH=(Duty>>8);

FTM2_C1VL=Duty;

FTM0_SC=0x10; //Select the PWM functionality for each channel that will be used to generate PWM by using the TPMCnSC register of each channel.

FTM2_SC=0x10;

}

void PWMInit(unsigned int Period)

{

unsigned int Temp=Period;

// FTM0_SC=0X10;

FTM0_CNTH=0x00;

FTM0_CNTL=0x00;

FTM0_MODH = (Temp>>8); // T total Period of PWM Cycle

FTM0_MODL = Period;

FTM0_C0VH = 0x00; // Ton Period of Total Period

FTM0_C0VL = 0x00;

FTM0_C1VH = 0x00; // Ton Period of Total Period

FTM0_C1VL = 0x00;

FTM0_C0SC = 0x14;

FTM0_C1SC = 0x14;

FTM2_MODH = (Temp>>8); // T total Period of PWM Cycle

FTM2_MODL = Period;

FTM2_C0VH = 0x00; // Ton Period of Total Period

FTM2_C0VL = 0x00;

FTM2_C1VH = 0x00; // Ton Period of Total Period

FTM2_C1VL = 0x00;

FTM2_C0SC = 0x28;

FTM2_C1SC = 0x28;

}

void delay()

{

int i;

for (i=0;i<25;i++){;}

}

Re: FTM2 channel not delivering PWM

michaelsteffenf — Mon, 21 Oct 2013 14:25:58 GMT

Hi,

Please try this code.

FTM2_SC=0x08; // busclk/1=59.6ns per count; buzzer on=0x08, off=0x00

FTM2_C0SC=0x28; // edge-aligned PWM

FTM2_MOD=16778; // 1KHz square wave on FTM0CH1, PTA1, J5-14

FTM2_C0V=16778>>1; // half of the above to produce 50% duty cycle PWM

Michael Steffen

Senior Field Applications Engineer

Freescale Semiconductor

Cell 815-519-1567

Re: FTM2 channel not delivering PWM

Robinwithu — Mon, 21 Oct 2013 14:48:23 GMT

Hi steffen,

I tried for Both the Timer (FTM0 and FTM2)...FTM0 is working as usual, but no response at FTM2 channel. :smileysad:

DANKE.

Re: FTM2 channel not delivering PWM

Robinwithu — Tue, 22 Oct 2013 07:48:10 GMT

Hello Steffen,

Does FMT2 Timer has to do something with Sysem Register (SYS_SOPT2)? or am i going in wrong direction?

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