FTM complementary mode problem FRDM-K64F.

josealonsovalle — Fri, 22 May 2015 05:45:35 GMT

Hi everyone,

i am trying to create a Center aligned PWM complementary signals en the FRDM-K64F using KDS.

My conditions must be:

Normal complementary

FTM0_CH0 - FTM0_CH1

FTM0_CH1 - FTM0_CH2

FTM0_CH6 - FTM0_CH7

in the reference manual of K64P144M (40.4.9 Complementary mode) there the next conditions.

FTMEN = 1, QUADEN = 0, DECAPEN = 0, COMBINE = 1, CPWMS = 0, and COMP = 1.

I initialized the registers but i have not nothing in the output channel, it supposed that the values of the CnV register are the value reading with the ADC channel.

Can sombody help me please??

This is my code..

//**************************************************
// DEFINE USES FOR THE TPM MODULES
//**************************************************
//source clock select.
#define  FTM_PLLFLL 1
#define  FTM_OSCERCLK 2
#define  FTM_MCGIRCLK 3
#define FTM_CNT_DIS 0
#define FTM_CLK 1
#define FTM_EXT_CLK 2
//preescaler definitions.
#define PS_1 0
#define PS_2 1
#define PS_4 2
#define PS_8 3
#define PS_16 4
#define PS_32 5
#define PS_64 6
#define PS_128 7
//confuralbles bits for the TPM modules.
#define  FTM_OC_TOGGLE FTM_CnSC_MSA_MASK|FTM_CnSC_ELSA_MASK
#define  FTM_OC_CLR FTM_CnSC_MSA_MASK|FTM_CnSC_ELSB_MASK
#define  FTM_OC_SET FTM_CnSC_MSA_MASK|FTM_CnSC_ELSA_MASK|FTM_CnSC_ELSB_MASK
#define  FTM_OC_OUTH FTM_CnSC_MSB_MASK|FTM_CnSC_MSA_MASK|FTM_CnSC_ELSB_MASK
#define  FTM_OC_OUTL FTM_CnSC_MSB_MASK|FTM_CnSC_MSA_MASK|FTM_CnSC_ELSA_MASK
#define  FTM_PWM_H FTM_CnSC_MSB_MASK|FTM_CnSC_ELSB_MASK  // PWM  with HIGH TRUE pulse.
#define  FTM_PWM_L FTM_CnSC_MSB_MASK|FTM_CnSC_ELSA_MASK  // PWM  with LOW  TRUE pulse.
#define EDGE_PWM 0 
#define CENTER_PWM 1
void init_FTM0(void)
{
  SIM_SCGC5 |= SIM_SCGC5_PORTA_MASK|SIM_SCGC5_PORTC_MASK; 
  PORTC_PCR1 = PORT_PCR_MUX(4); // S1
  PORTC_PCR2 = PORT_PCR_MUX(4); // S2
  PORTC_PCR3 = PORT_PCR_MUX(4); // S3
  PORTC_PCR4 = PORT_PCR_MUX(4); // S4
  PORTA_PCR1 = PORT_PCR_MUX(3); // S5
  PORTA_PCR2 = PORT_PCR_MUX(3); // S6
  SIM_SOPT2 |= SIM_SOPT2_PLLFLLSEL(1);
  SIM_SCGC6 |= SIM_SCGC6_FTM0_MASK;
  FTM0_MODE = FTM_MODE_WPDIS_MASK; // write protection is disable
  FTM0_MOD = FTM_MOD_MOD(350);// FTM mod
  FTM0_MODE = FTM_MODE_FTMEN_MASK; // all registers are available
  FTM0_SC |=  FTM_SC_PS(PS_4)|FTM_SC_CLKS(FTM_CLK); // Prescale divided by 4,  setup source clock
  FTM0_COMBINE |= FTM_COMBINE_COMBINE0_MASK|FTM_COMBINE_COMBINE1_MASK|FTM_COMBINE_COMBINE3_MASK; // enable combine for CH0-CH1,CH2-CH3,CH6-CH7
  FTM0_COMBINE |= FTM_COMBINE_COMP0_MASK|FTM_COMBINE_COMP1_MASK|FTM_COMBINE_COMP3_MASK;//enable complement of CH0-CH1,CH2-CH3,CH6-CH7
  FTM0_COMBINE |= FTM_COMBINE_DTEN0_MASK|FTM_COMBINE_DTEN1_MASK|FTM_COMBINE_DTEN3_MASK;// enable deadtime.
  FTM0_DEADTIME = FTM_DEADTIME_DTVAL(10);// set deadtime
  FTM0_CNTIN = 1;
  FTM0_CNT= 1;
  FTM0_C0SC |=  FTM_PWM_H; //S1 High true pulses
  FTM0_C1SC |=  FTM_PWM_L; //S2 Low true pulses
  FTM0_C2SC |=  FTM_PWM_H; //S3
  FTM0_C3SC |=  FTM_PWM_L; //S4
  FTM0_C6SC |=  FTM_PWM_H; //S5
  FTM0_C7SC |=  FTM_PWM_L; //S6
}
void pwm_write(unsigned int pwm1, unsigned int pwm2, unsigned int pwm3, unsigned int pwm4, unsigned int pwm5, unsigned int pwm6)
{
  FTM0_C0V = FTM_CnV_VAL(pwm1); // write values in the CnV (is an ADC value that the function get)
  FTM0_C1V = FTM_CnV_VAL(pwm2);
  FTM0_C2V = FTM_CnV_VAL(pwm3);
  FTM0_C3V = FTM_CnV_VAL(pwm4);
  FTM0_C6V = FTM_CnV_VAL(pwm5);
  FTM0_C7V = FTM_CnV_VAL(pwm6);
}

Re: FTM complementary mode problem FRDM-K64F.

Alice_Yang — Fri, 22 May 2015 10:39:11 GMT

Hello Alonso ,

About the PWM mode , please refer to here :

From your describe ""create a Center aligned PWM complementary signals" , while "CPWMS = 0," , it should be "1".

Please refer to the table to check your other configuration.

And recommend you some k64 PWM demo :

FRDM-K64 PWM basic example using mbed

Baremetal code examples using FRDM-K64F

Have a great day,

Alice

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