About MPC5744P PWM Input capture

damonmeng — Mon, 09 Apr 2018 08:32:11 GMT

Hi All,

About MPC5744P PWM Input capture,it happened a question:

I select the FlexPWM_0 Auxiliary Input 2,the Pad is 102,the signal is Square,DUTY 75%,Whatever 100Hz/500Hz/1KHz/5KHz,Get CVAL0 & CVAL1 is all Fault.Please see the question.Thanks!

MC_CGM.AC0_SC.R = 0x02000000;
MC_CGM.AC0_DC0.R = 0x80000000|(4 << 16);

SIUL2.MSCR[98].B.SRC = 0b00;
    SIUL2.MSCR[98].B.OBE = 0;
    SIUL2.MSCR[98].B.ODE = 0;
    SIUL2.MSCR[98].B.SMC = 0;
    SIUL2.MSCR[98].B.APC = 0;
    SIUL2.MSCR[98].B.IBE = 1;
    SIUL2.MSCR[98].B.PUS = 1;
    SIUL2.MSCR[98].B.PUE = 1;
    SIUL2.MSCR[98].B.SSS = 0b0001;
    SIUL2.IMCR[96].B.SSS = 0b0010;

FlexPWM_0.OUTEN.R = 0x110;

FlexPWM_0.SUB[2].CTRL1.R = 0x0400 | (3 << 4)

FlexPWM_0.SUB[2].CTRL2.R = 0x2000;
FlexPWM_0.SUB[2].DTCNT0.R = 0x0000;
FlexPWM_0.SUB[2].DTCNT1.R = 0x0000;
FlexPWM_0.SUB[2].INIT.R = 0x0;
FlexPWM_0.SUB[2].VAL0.R = 4096/2; // PWMX rising edge
FlexPWM_0.SUB[2].VAL1.R = 4096; // PWMX falling edge

FlexPWM_0.SUB[2].DISMAP.R = 0x0000;

FlexPWM_0.SUB[2].CAPTCMPX.B.EDGCMPX = 0b1000;

FlexPWM_0.SUB[2].CAPTCTRLX.B.CFXWM = 0b00;
FlexPWM_0.SUB[2].CAPTCTRLX.B.EDGCNTX_EN = 0b0;
FlexPWM_0.SUB[2].CAPTCTRLX.B.INPSELX = 0b0;
FlexPWM_0.SUB[2].CAPTCTRLX.B.EDGX1 = 0b01;
FlexPWM_0.SUB[2].CAPTCTRLX.B.EDGX0 = 0b10;
FlexPWM_0.SUB[2].CAPTCTRLX.B.ONESHOTX = 0b1;
FlexPWM_0.SUB[2].CAPTCTRLX.B.ARMX = 0b0;

FlexPWM_0.MCTRL.B.LDOK = 0b0100;

main

FlexPWM_0.MCTRL.B.RUN = 0b0100;

for(;;)
{

FlexPWM_0.SUB[2].CAPTCTRLX.B.ARMX = 0b1;
while(!(0x0080 & FlexPWM_0.SUB[2].STS.R)){}; // wait for capture flag X1

    txmsg.data[0] = 0;
    txmsg.data[1] = (FlexPWM_0.SUB[2].CVAL0.R) >> 8;
     txmsg.data[2] = FlexPWM_0.SUB[2].CVAL0.R;
    txmsg.data[3] = 0;

    txmsg.data[4] = 0;
     txmsg.data[5] = (FlexPWM_0.SUB[2].CVAL1.R) >> 8;
    txmsg.data[6] = FlexPWM_0.SUB[2].CVAL1.R;
    txmsg.data[7] = 0;

FlexPWM_0.SUB[2].STS.R = 0x00C0; // clear CFX1/CFX0 flags

}

Re: About MPC5744P PWM Input capture

chosp — Wed, 07 Jul 2021 14:28:20 GMT

I am experiencing a similar issue with capture.

Doesn't matter which prescaler value I use for the PWM counter, the CVAL1 - CVAL0 yields the same counter difference.

Re: About MPC5744P PWM Input capture

chosp — Wed, 07 Jul 2021 14:37:08 GMT

Solved, forgot to set LDOK after configure.

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About MPC5744P PWM Input capture

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