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Hi,
I have set the interrupt request after ADC conversion.
However, I have some strange behaviors observed.
When the INT1SEL bit is 0 to 7, it can be confirmed that the ADC interrupt is invoked in the same frequency as the EPWM timer event cycle.
However, if the INT1SEL bit is set to 8 to 15, the interrupt is called at a frequency greater than 100 kHz, much faster.
I wonder what causes the above.
Below is the code I tested.
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//
// Included Files
//
#include "DSP28x_Project.h"
//
// Function Prototypes
//
__interrupt void adc_isr(void);
void Adc_Config(void);
//
// Globals
//
Uint16 LoopCount;
Uint16 ConversionCount;
Uint16 Voltage0;
Uint16 Voltage1;
Uint16 Voltage2;
Uint16 Voltage3;
Uint16 Voltage4;
Uint16 Voltage5;
Uint16 Voltage6;
Uint16 Voltage7;
Uint16 Voltage8;
Uint16 Voltage9;
Uint16 Voltage10;
Uint16 Voltage11;
Uint16 Voltage12;
Uint16 Voltage13;
Uint16 Voltage14;
Uint16 Voltage15;
//
// Main
//
void main(void)
{
DINT;
IER = 0x0000;
IFR = 0x0000;
InitSysCtrl();
EALLOW;
GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0;
GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;
GpioDataRegs.GPADAT.bit.GPIO0 = 0;
EDIS;
InitPieCtrl();
InitPieVectTable();
EALLOW;
PieVectTable.ADCINT1 = &adc_isr;
EDIS;
PieCtrlRegs.PIEIER1.bit.INTx1 = 1;
IER |= M_INT1;
InitAdc();
AdcOffsetSelfCal();
Adc_Config();
LoopCount = 0;
ConversionCount = 0;
EINT;
ERTM;
for(;;)
{
LoopCount++;
}
}
//
// Functions
//
__interrupt void adc_isr(void)
{
GpioDataRegs.GPASET.bit.GPIO0 = 1;
Voltage0 = AdcResult.ADCRESULT0;
Voltage1 = AdcResult.ADCRESULT1;
Voltage2 = AdcResult.ADCRESULT2;
Voltage3 = AdcResult.ADCRESULT3;
Voltage4 = AdcResult.ADCRESULT4;
Voltage5 = AdcResult.ADCRESULT5;
Voltage6 = AdcResult.ADCRESULT6;
Voltage7 = AdcResult.ADCRESULT7;
Voltage8 = AdcResult.ADCRESULT8;
Voltage9 = AdcResult.ADCRESULT9;
Voltage10 = AdcResult.ADCRESULT10;
Voltage11 = AdcResult.ADCRESULT11;
Voltage12 = AdcResult.ADCRESULT12;
Voltage13 = AdcResult.ADCRESULT13;
Voltage14 = AdcResult.ADCRESULT14;
Voltage15 = AdcResult.ADCRESULT15;
ConversionCount++;
GpioDataRegs.GPACLEAR.bit.GPIO0 = 1;
AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;
PieCtrlRegs.PIEACK.bit.ACK1 = 1;
}
void Adc_Config(void)
{
EALLOW;
AdcRegs.ADCCTL2.bit.ADCNONOVERLAP = 0;
AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1;
AdcRegs.INTSEL1N2.bit.INT1E = 1;
AdcRegs.INTSEL1N2.bit.INT1CONT = 0;
AdcRegs.INTSEL1N2.bit.INT1SEL = 15;
AdcRegs.ADCSOC0CTL.bit.CHSEL = 0;
AdcRegs.ADCSOC2CTL.bit.CHSEL = 1;
AdcRegs.ADCSOC4CTL.bit.CHSEL = 2;
AdcRegs.ADCSOC6CTL.bit.CHSEL = 3;
AdcRegs.ADCSOC8CTL.bit.CHSEL = 4;
AdcRegs.ADCSOC10CTL.bit.CHSEL = 5;
AdcRegs.ADCSOC12CTL.bit.CHSEL = 6;
AdcRegs.ADCSOC14CTL.bit.CHSEL = 7;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN0 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN2 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN4 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN6 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN8 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN10 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN12 = 1;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN14 = 1;
AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC2CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC4CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC6CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC8CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC10CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC12CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC14CTL.bit.TRIGSEL = 5;
AdcRegs.ADCSOC0CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC1CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC2CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC3CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC4CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC5CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC6CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC7CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC8CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC9CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC10CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC11CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC12CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC13CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC14CTL.bit.ACQPS = 10;
AdcRegs.ADCSOC15CTL.bit.ACQPS = 10;
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
EDIS;
EPwm1Regs.ETSEL.bit.SOCAEN = 1;
EPwm1Regs.ETSEL.bit.SOCASEL = 4;
EPwm1Regs.ETPS.bit.SOCAPRD = 1;
EPwm1Regs.CMPA.half.CMPA = 0x0080;
EPwm1Regs.TBPRD = 5999;
EPwm1Regs.TBCTL.bit.CTRMODE = 0;
EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0;
EPwm1Regs.TBCTL.bit.CLKDIV = 0;
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
EDIS;
}
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Thanks in advance.
