Blink a Led on F28379D

ID:237562 · 發表于 2017-10-7 04:14

// FILE: Lab2_cpu01.c
//File extracted from Texas one day workshop 379D

#include "F28x_Project.h"    // Device Header File and Examples Include File

// Function Prototypes
void ConfigureADC(void);
void ConfigureEPWM(void);
void ConfigureDAC(void);
void SetupADCEpwm(void);
interrupt void adca1_isr(void);

// Variables
#define RESULTS_BUFFER_SIZE 256
Uint16 AdcaResults[RESULTS_BUFFER_SIZE];
Uint16 resultsIndex;
Uint16 ToggleCount = 0;
Uint16 dacOffset;
Uint16 dacOutput;
Uint16 sineEnable = 0;
extern int QuadratureTable[40];

void main(void)
{
// Initialize System Control
InitSysCtrl();
EALLOW;
ClkCfgRegs.PERCLKDIVSEL.bit.EPWMCLKDIV = 1;
EDIS;

// Initialize GPIO
InitGpio(); // Configure default GPIO
EALLOW;
GpioCtrlRegs.GPADIR.bit.GPIO18 = 1; // Used as input to ADC
GpioCtrlRegs.GPADIR.bit.GPIO31 = 1; // Drives LED LD2 on controlCARD
EDIS;
GpioDataRegs.GPADAT.bit.GPIO18 = 0; // Force GPIO18 output LOW
GpioDataRegs.GPADAT.bit.GPIO31 = 1; // Turn off LED

// Clear all interrupts and initialize PIE vector table
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();

// Map ISR functions
EALLOW;
PieVectTable.ADCA1_INT = &adca1_isr; // Function for ADCA interrupt 1
EDIS;

// Configure the ADC and power it up
ConfigureADC();

// Configure the ePWM
ConfigureEPWM();

// Configure DAC-B
ConfigureDAC();

// Setup the ADC for ePWM triggered conversions on channel 0
SetupADCEpwm();

// Initialize results buffer
for(resultsIndex = 0; resultsIndex < RESULTS_BUFFER_SIZE; resultsIndex++)
{
AdcaResults[resultsIndex] = 0;
}
resultsIndex = 0;

// Enable PIE interrupt
PieCtrlRegs.PIEIER1.bit.INTx1 = 1;

// Enable global interrupts and higher priority real-time debug events
IER |= M_INT1; // Enable group 1 interrupts
EINT;    // Enable Global interrupt INTM
ERTM;    // Enable Global real-time interrupt DBGM

// Sync ePWM
EALLOW;
CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1;
EDIS;

// Start ePWM
EPwm2Regs.TBCTL.bit.CTRMODE = 0; // Un-freeze and enter up-count mode

do {

      GpioDataRegs.GPADAT.bit.GPIO31 = 0; // Turn on LED
      DELAY_US(1000 * 500); // ON delay
      GpioDataRegs.GPADAT.bit.GPIO31 = 1;    // Turn off LED
      DELAY_US(1000 * 500); // OFF delay

} while(1);
}

// Write ADC configurations and power up the ADC for both ADC A and ADC B
void ConfigureADC(void)
{
EALLOW;
AdcaRegs.ADCCTL2.bit.PRESCALE = 6; // Set ADCCLK divider to /4
AdcaRegs.ADCCTL2.bit.RESOLUTION = 0; // 12-bit resolution
AdcaRegs.ADCCTL2.bit.SIGNALMODE = 0; // Single-ended channel conversions (12-bit mode only)
AdcaRegs.ADCCTL1.bit.INTPULSEPOS = 1; // Set pulse positions to late
AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1; // Power up the ADC
DELAY_US(1000); // Delay for 1ms to allow ADC time to power up
EDIS;
}

void ConfigureEPWM(void)
{
EALLOW;
// Assumes ePWM clock is already enabled
EPwm2Regs.TBCTL.bit.CTRMODE = 3;          // Freeze counter
EPwm2Regs.TBCTL.bit.HSPCLKDIV = 0; // TBCLK pre-scaler = /1
EPwm2Regs.TBPRD = 0x07D0;          // Set period to 2000 counts (50kHz)
EPwm2Regs.ETSEL.bit.SOCAEN = 0;          // Disable SOC on A group
EPwm2Regs.ETSEL.bit.SOCASEL = 2;          // Select SOCA on period match
EPwm2Regs.ETSEL.bit.SOCAEN = 1; // Enable SOCA
EPwm2Regs.ETPS.bit.SOCAPRD = 1;          // Generate pulse on 1st event
EDIS;
}

void ConfigureDAC(void)
{
EALLOW;
DacbRegs.DACCTL.bit.DACREFSEL = 1; // Use ADC references
DacbRegs.DACCTL.bit.LOADMODE = 0; // Load on next SYSCLK
DacbRegs.DACVALS.all = 0x0800; // Set mid-range
DacbRegs.DACOUTEN.bit.DACOUTEN = 1; // Enable DAC
EDIS;
}

void SetupADCEpwm(void)
{
EALLOW;
AdcaRegs.ADCSOC0CTL.bit.CHSEL = 0;    // SOC0 will convert pin A0
AdcaRegs.ADCSOC0CTL.bit.ACQPS = 14; // Sample window is 100 SYSCLK cycles
AdcaRegs.ADCSOC0CTL.bit.TRIGSEL = 7; // Trigger on ePWM2 SOCA/C
AdcaRegs.ADCINTSEL1N2.bit.INT1SEL = 0; // End of SOC0 will set INT1 flag
AdcaRegs.ADCINTSEL1N2.bit.INT1E = 1;    // Enable INT1 flag
AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; // Make sure INT1 flag is cleared
EDIS;
}

interrupt void adca1_isr(void)
{
// Read the ADC result and store in circular buffer
AdcaResults[resultsIndex++] = AdcaResultRegs.ADCRESULT0;
if(RESULTS_BUFFER_SIZE <= resultsIndex)
{
resultsIndex = 0;
}

// Toggle GPIO18 so we can read it with the ADC
if (ToggleCount++ >= 15)
{
GpioDataRegs.GPATOGGLE.bit.GPIO18 = 1;
ToggleCount = 0;
}

// Write to DACB to create input to ADC-A0
if (sineEnable != 0)
{
dacOutput = dacOffset + ((QuadratureTable[resultsIndex % 0x20] ^ 0x8000) >> 5);
}
else
{
dacOutput = dacOffset;
}
DacbRegs.DACVALS.all = dacOutput;

// Return from interrupt
AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; // Clear ADC INT1 flag
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge PIE group 1 to enable further interrupts
}

// end of file

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Blink a Led on F28379D

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