edge-aligned setting in kinetis k40

MatteoPioTotta — Mon, 10 Sep 2012 21:40:32 GMT

Hi,i need to set edge-aligned pwm in kinetis k40 but i can't understand how set 'COMBINE'=0 MSnB=1 and CPWMS=0. I already set DECAPEN and QUADEN using the mask,but i can't set COMBINE,MSnB AND CPWMS!Anyone can help me?

Re: edge-aligned setting in kinetis k40

admin — Mon, 10 Sep 2012 22:07:05 GMT

Are you setting the WPDIS? (Write Protect Disable)

If that doesn't fix it send the snippet of your code where your initializing the FTM.

Re: edge-aligned setting in kinetis k40

MatteoPioTotta — Mon, 10 Sep 2012 22:15:55 GMT

Hi,

i'm a student and i 'm reading a dc motor tutorial of k40.I already set Write Protect Disable as wrote in tutorial but i can understand how set decapen msnb and combine using the mask.

Re: edge-aligned setting in kinetis k40

MatteoPioTotta — Mon, 10 Sep 2012 22:18:59 GMT

My code is:

* PWM.c

* Created on: 10/set/2012

* Author: teteo

#include "Clock.h"

#include"derivative.h"

#include<stdio.h>

float MotorTickVar;

void InizializzazionePwmMotore()

{

//Enable the Clock to the FTM1 Module

SIM_SCGC6 |= SIM_SCGC6_FTM1_MASK;

// PORTC_PCR4 = PORT_PCR_MUX(1) | PORT_PCR_DSE_MASK; //Enable GPIO on on the pin -

//route the output of that channel 0 to the pin... (pick a different multiplexer value for routing the timer)

//ch 11.4.1 of the k40 reference manual is the pin control register

//For port c pin 1.. bits 10-8 Pin Mux Control...

PORTA_PCR8 = PORT_PCR_MUX(3) | PORT_PCR_DSE_MASK;

PORTA_PCR9 = PORT_PCR_MUX(3) | PORT_PCR_DSE_MASK;

// Choose EDGE-Aligned PWM: selected when QUADEN=0, DECAPEN=0, COMBINE=0, CPWMS=0, and MSnB=1 (page 964)

// Properly set up Flex Timer Module

////Per prima cosa bisogna abilitare la scrittura di alcuni registri:

//FTM0_MODE[WPDIS] = 1; //Disable Write Protection - enables changes to QUADEN, DECAPEN, etc.

FTM1_MODE |= FTM_MODE_WPDIS_MASK;//DISABILITA LA PROTEZIONE DELLA SCRITTURA

/////////////////SETTAGGIO DECAPEN

//FTMEN is bit 0, need to set to zero so DECAPEN can be set to 0

FTM1_MODE &= ~1; //METTE A ZERO DECAPEN

/////////////SETTAGGIO QUADEN

//Set Edge Aligned PWM

FTM1_QDCTRL &=~FTM_QDCTRL_QUADEN_MASK;

//QUADEN is Bit 1, Set Quadrature Decoder Mode (QUADEN) Enable to 0, (disabled)

//FTM0_SC = 0x16; //Center Aligned PWM Select = 0, sets FTM Counter to operate in up counting mode,

//it is field 5 of FTMx_SC (status control) - also setting the pre-scale bits here

//////PROVO A SETTARE DECAPEN E COMBINE

FTM1_COMBINE|=FTM_COMBINE_COMBINE0_MASK;

FTM1_/////////???????????????????????????

// Also need to setup the FTM0C0SC channel control register - Page 897 section 37.3.6

FTM1_CNT = 0x0; //FTM Counter Value - (initialize the CNT before writing to MOD) (16 bit available - bits 0-15 are count)

FTM1_MOD = 0x0; //Set the Modulo register (16 bit available - bits 0-15), Mod is set to 24000

FTM1_CNTIN = 0; //Set the Counter Initial Value to 0 (pg 915)

//change MSnB = 1

FTM1_C0SC |= FTM_CnSC_ELSB_MASK;

FTM1_C0SC &= ~FTM_CnSC_ELSA_MASK;

FTM1_C0SC |= FTM_CnSC_MSB_MASK;

FTM1_C0V = 0x0; //Set the Channel n Value to (16 bit available - bits 0-15)

//Set the complimentary pinout

FTM1_C1SC |= FTM_CnSC_ELSB_MASK;

FTM1_C1SC &= ~FTM_CnSC_ELSA_MASK;

FTM1_C1SC |= FTM_CnSC_MSB_MASK;

FTM1_C1V = 0x0;

FTM1_SC = FTM_SC_PS(0) | FTM_SC_CLKS(1);

// Interrupts

FTM1_SC |= FTM_SC_TOIE_MASK; //enable the interrupt mask

enable_irq(63); // (79-16) Set NVIC location, but you still have to change/check NVIC file sysinit.c under Project Settings Folder

}

// Set the PWM of the Motor

void SetMotorPWM(float DutyCycle)

{

//float compDuty = (float)100.0-DutyCycle;

FTM1_C0V =(int)((DutyCycle*.01)* (float)0x0);

FTM1_C1V =(int)((1.0-DutyCycle*.01)* (float)0x0);

}

//Create Interrupt when motor functions are complete

void MotorTick()

{

if (MotorTickVar < 0xff)//if motor tick less than 255 count up...

MotorTickVar++;

//Clear the overflow mask if set

if(FTM1_SC & FTM_SC_TOF_MASK)

FTM1_SC &= ~FTM_SC_TOF_MASK;

//LED_E2_TOGGLE; // ends up being ___ Hz (correct)

}

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