s32k144 pwm deadtime setting issue

[alice_th]

hello @danielmartynek 

when i set with dead time, ch1 don't have waveform output, could you help to check it 

[Senlent]

Hi@alice_thanks

I opened your project and you can see that our IDE has prompted you with a configuration error.

you should disable this options as you have already enable ch1

[alice_th]

@Senlent hello,

i have question about it, i need below waveform, as my understanding,

i need enable channel(n+1) output with deadtime setting with duplicate channel(n) 

if disable it , how can achieve it ?

or can you help modify the project , thnaks !

[Senlent]

Hi@alice_thanks

Your duplicate question has already been answered here.

https://community.nxp.com/t5/S32K/about-s32k144-pwm-phase-shift/m-p/1972514/highlight/false#M41973

[alice_th]

with duplicate channel(n) or invert channel(n)

[Senlent]

Hi@alice_thanks

You can find "ftm_combined_pwm_s32k144" in S32 DS, please refer to it.

[alice_th]

hello @Senlent 

i just set larger deadtime, i see the delay, for combined it only support invert waveform, how to generate duplicate channel(n+1) ?

and the combined  only support Adjacent channel, if i need with ch0, and duplicate/invert channel 3 or channel6  with deadtime setting.

another question: is there phase shift example base on this sdk ?

[Senlent]

Hi@alice_thanks

You need to read our data sheet or AN5303

The FTM module of S32K1 supports complementary mode, which is enabled by the COMP bit in the FTM_COMBINE register. The output signal is generated only by the even-numbered FTM channels, and the odd-numbered channels are generated by complementary logic as a supplement to the even-numbered FTM channels. A separate complementary PWM can be output for each pair of FTM channels.

[alice_th]

@Senlent 

i tested the AN code, have some questions about it

void Phase_Shifted_PWM()

{

SCG_Init();

HSRUN_Init();

    /* Enable clock for FTM1 */

    PCC->PCCn[PCC_FTM1_INDEX] = PCC_PCCn_PCS(6) | PCC_PCCn_CGC_MASK;

    /* Enable clock for PORTB */

    PCC->PCCn[PCC_PORTB_INDEX] = PCC_PCCn_CGC_MASK;

    /* Enable clock for PORTD */

    PCC->PCCn[PCC_PORTD_INDEX] = PCC_PCCn_CGC_MASK;

    PORTB->PCR[2] = PORT_PCR_MUX(2); // Set PTB2 for FTM1 � Channel0

    PORTB->PCR[3] = PORT_PCR_MUX(2); // Set PTB3 for FTM1 � Channel1

    PORTD->PCR[8] = PORT_PCR_MUX(6); // Set PTD8 for FTM1 � Channel4

    PORTD->PCR[9] = PORT_PCR_MUX(6); // Set PTd9 for FTM1 � Channel5

    /* Enable combine, complementary mode and dead-time for channel pair CH0/CH1 and CH4/CH5 */

    FTM1->COMBINE = FTM_COMBINE_COMBINE0_MASK | FTM_COMBINE_COMP0_MASK | FTM_COMBINE_DTEN0_MASK

          | FTM_COMBINE_COMBINE2_MASK | FTM_COMBINE_COMP2_MASK | FTM_COMBINE_DTEN2_MASK;

    FTM1->CONTROLS[0].CnSC=FTM_CnSC_ELSB_MASK; // Select high-true pulses

    FTM1->CONTROLS[1].CnSC=FTM_CnSC_ELSB_MASK; // Select high-true pulses

    FTM1->CONTROLS[4].CnSC=FTM_CnSC_ELSB_MASK; // Select high-true pulses

    FTM1->CONTROLS[5].CnSC=FTM_CnSC_ELSB_MASK; // Select high-true pulses

    /* Set Modulo (10kHz PWM frequency @112MHz system clock) */

    FTM1->MOD = FTM_MOD_MOD(11200-1); // Set modulo

    FTM1->CONTROLS[0].CnV=FTM_CnV_VAL(2800); // Set channel Value

    FTM1->CONTROLS[1].CnV=FTM_CnV_VAL(8400); // Set channel Value

    FTM1->CONTROLS[4].CnV=FTM_CnV_VAL(5600); // Set channel Value

    FTM1->CONTROLS[5].CnV=FTM_CnV_VAL(11200); // Set channel Value

    FTM1->CNT = 0;         // Counter reset

/* Insert DeadTime (1us) */

FTM1->DEADTIME = FTM_DEADTIME_DTPS(3) | FTM_DEADTIME_DTVAL(7);

    FTM1->SC|=FTM_SC_CLKS(1)|FTM_SC_PWMEN0_MASK|FTM_SC_PWMEN1_MASK|FTM_SC_PWMEN4_MASK

        |FTM_SC_PWMEN5_MASK; // Select clock and enable PWM

    while(1);

}

which part is phase shift setting ?

CnV i think is  duty cycle , 2800 25% 8400 75% duty cycle, why waveform is 50% duty cycle

[alice_th]

hello @Senlent 

i see the AN you mention, it's all register setting for it, does the tools support it ? do you have api to do this ?

does the sdk have api or how to use the tools to set for the phase shift example ?

can you help with phase shift example with the SDK ?

[alice_th]

when disable dead time setting , both ch0 ch1 have waveform output,

for ch1 there is nothing change, could you please help check the project i have already attached ?