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F28335 ePWM registers

Christian Ekman
Intellectual 340 points
Other Parts Discussed in Thread: CONTROLSUITE

Hi,

I'm having some trouble running the ePWM1regs on the F28335 experimenter's kit. When I use the "step over" function in code composer 5.3 I am allowed to write to the register and my program works exactly as it's supposed to. However, when I click the "resume" button (green arrow) all the registers just change values to some default value for some reason and I cannot change them back to my desired values.

TBPRD changes to 0x0EA6, CMPA changes to 0x0753, CMPB changes to 0x0001, AQCTLA remains (changes to?) 0x0060, AQCTLB changes to 0x0000. Does anyone here know of a reason why this might be happening?

My code is:

void main(){
EALLOW;
	GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;   	// EPWM1A pin
	GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;   	// EPWM1B pin

	GpioCtrlRegs.GPAPUD.bit.GPIO0 = 1;    // Disable the internal pullup resistance of EPWM1A pin
	GpioCtrlRegs.GPAPUD.bit.GPIO1 = 1;    // Disable the internal pullup resistance of EPWM1B pin

	GpioCtrlRegs.GPADIR.bit.GPIO0 	= 1;	// GPIO0 as OUTPUT
	GpioCtrlRegs.GPADIR.bit.GPIO1 	= 1;	// GPIO1 as OUTPUT
	EDIS;

	EALLOW;
	SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 1;
	EDIS;

	EALLOW;
	SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC =0;
	EDIS;

	EPwm1Regs.TBPRD = 0x0050; // Period = 1200 TBCLK counts
	EPwm1Regs.TBPHS.half.TBPHS = 0; // Set Phase register to zero
	EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
	EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Master module
	EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
	EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; // Sync down-stream module
	EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
	EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
	EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
	EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
	EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR; // set actions for EPWM1A
	EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;
	EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; // set actions for EPWM1B
	EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;

	//============================================================
	EPwm1Regs.CMPA.half.CMPA = 0x0020; // adjust duty for output EPWM1A & EPWM1B
	EPwm1Regs.CMPB = 0x0030; // adjust point-in-time for ADCSOC trigger

	EALLOW;
	SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC =1;
	EDIS;



	while(1)
	{
		asm(" nop;");
	}
}