UCD3138: Evaluation board

Many thanks Ian, I have the system up and running now (albeit I disabled the FAULT3 to ground check and include an additional line to produce the .x0 file) and the PWM has the level of resolution that I need, however the minimum switching frequency is approximately 15kHz. Ideally I would like tis to be around 10kHz. Do you know if this is possible? I am using the TI training labs (in particular LAB2).

My test source code is below if that helps



float PS = 65.0e-6;
int i;
#define PCLK_PERIOD 4.0e-9
//#define PERIOD_SECONDS 10.0e-6
#define PERIOD ((int)(PS/PCLK_PERIOD)<<4)
#define EVENT1 (int)(PERIOD*0.20)
#define EVENT2 (int)(PERIOD*0.75)
#define EVENT3 (int)(PERIOD*0.70)
#define EVENT4 (int)(PERIOD*0.25)

//int ram_event2; // comment for hyperknob [min=2500, max=37500, step=2500]

void init_dpwm0(void)
{
Dpwm0Regs.DPWMCTRL0.bit.PWM_EN = 0; // disable DPWM0 locally during initilization

Dpwm0Regs.DPWMCTRL0.bit.CLA_EN = 0; // default is 1 (i.e. default is to use the filter output to control DPWM)

Dpwm0Regs.DPWMPRD.all = PERIOD; // use .all for all values, so that the scaling matches
Dpwm0Regs.DPWMEV1.all = EVENT1; // set EVENT 1 to 0% (start) of period
Dpwm0Regs.DPWMEV2.all = EVENT2; // set EVENT 2 to 25% (start) of period
Dpwm0Regs.DPWMEV3.all = EVENT3; // set EVENT 3 to 50% (start) of period
Dpwm0Regs.DPWMEV4.all = EVENT4; // set EVENT 4 to 75% (start) of period

Dpwm0Regs.DPWMCTRL0.bit.PWM_EN = 1; // enable DPWM0 locally
LoopMuxRegs.GLBEN.bit.DPWM0_EN = 1; // enable DPWM0 globally
}


void main()
{
// enable JTAG
MiscAnalogRegs.IOMUX.all = 0;

//---------------------------------------------------------------------------
// IMPORTANT: READ BELOW, OR CODE MAY NOT EXECUTE CORRECTLY
//---------------------------------------------------------------------------
// tie pin FAULT3 to ground for normal operation
// tie pin FAULT3 to 3.3V to clear checksum
//if(GioRegs.FAULTIN.bit.FLT3_IN == 1)
//{
// clear_integrity_word();
//}

#if (UCD3138|UCD3138064)
MiscAnalogRegs.CLKTRIM.bit.HFO_LN_FILTER_EN = 0;
MiscAnalogRegs.CSTRIM.bit.RESISTOR_TRIM =23; //28;
#endif

init_pmbus(0x58); // initialize PMBus handler
init_dpwm0(); // initialize DPWM0
// ram_event2 = Dpwm0Regs.DPWMEV2.all; // initialize hyperknob
for(;;)
{
pmbus_handler();
// Dpwm0Regs.DPWMEV2.all = ram_event2; // put hyperknob value into register

if(PS < 2.0e-6) PS = 65.0e-6;
else{
PS = PS - 0.01e-6;
//Set PWM
Dpwm0Regs.DPWMCTRL0.bit.PWM_EN = 0; // disable DPWM0 locally during initilization
Dpwm0Regs.DPWMPRD.all = PERIOD; // use .all for all values, so that the scaling matches
Dpwm0Regs.DPWMEV1.all = EVENT1; // set EVENT 1 to 0% (start) of period
Dpwm0Regs.DPWMEV2.all = EVENT2; // set EVENT 2 to 25% (start) of period
Dpwm0Regs.DPWMEV3.all = EVENT3; // set EVENT 3 to 50% (start) of period
Dpwm0Regs.DPWMEV4.all = EVENT4; // set EVENT 4 to 75% (start) of period
Dpwm0Regs.DPWMCTRL0.bit.PWM_EN = 1; // enable DPWM0 locally
}
//Wait
for(i=0;i<100000;i++){

}

}
}