问题,如何设置ADC由epwm开启???我有源程序

yinhua

有问题:  不明白如何用epwm来启动ADC,硬件上需要有什么要的链接呢?????

// TI File $Revision: /main/2 $
// Checkin $Date: November 7, 2008   16:33:22 $
//###########################################################################
//
// FILE:   Example_2802xAdcSoc.c
//
// TITLE:  DSP2802x ADC Start-Of-Conversion (SOC) Example Program.
//
// ASSUMPTIONS:
//
//   This program requires the DSP2802x header files.
//
//   Make sure the CPU clock speed is properly defined in
//   DSP2802x_Examples.h before compiling this example.
//
//   Connect signals to be converted to A2 and A3.
//
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The 2802x Boot Mode table is shown below.
//    For information on configuring the boot mode of an eZdsp,
//    please refer to the documentation included with the eZdsp,
//
//       Boot      GPIO18     GPIO29    GPIO34
//       Mode      SPICLKA    SCITXDA
//                 SCITXB
//       -------------------------------------
//       Flash       1          1        1
//       SCI-A       1          1        0
//       SPI-A       1          0        1
//       I2C-A       1          0        0
//       ECAN-A      0          1        1
//       SARAM       0          1        0  <- "boot to SARAM"
//       OTP         0          0        1
//       I/0         0          0        0
//
//
// DESCRIPTION:
//
//   This example sets up the PLL in x12/2 mode.
//
//   For 60 MHz devices (default)
//   (assuming a 10Mhz input clock).
//
//   Interrupts are enabled and the ePWM1 is setup to generate a periodic
//   ADC SOC - ADCINT1. Two channels are converted, ADCINA4 and ADCINA2.
//
//   Watch Variables:
//
//         Voltage1[10]     Last 10 ADCRESULT0 values
//         Voltage2[10]     Last 10 ADCRESULT1 values
//         ConversionCount  Current result number 0-9
//         LoopCount        Idle loop counter
//
//
//###########################################################################
// $TI Release: 2802x Header Files V1.00 $
// $Release Date: November 10, 2008 $
//###########################################################################

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

// Prototype statements for functions found within this file.
interrupt void adc_isr(void);
void Adc_Config(void);


// Global variables used in this example:
Uint16 LoopCount;
Uint16 ConversionCount;
Uint16 Voltage1[10];
Uint16 Voltage2[10];


main()
{

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2803x_SysCtrl.c file.
   InitSysCtrl();


// Step 2. Initialize GPIO:
// This example function is found in the DSP2802x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
   DINT;

// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2802x_PieCtrl.c file.
   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP2802x_DefaultIsr.c.
// This function is found in DSP2802x_PieVect.c.
   InitPieVectTable();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
   EALLOW;  // This is needed to write to EALLOW protected register
   PieVectTable.ADCINT1 = &adc_isr;
   EDIS;    // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2802x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   InitAdc();  // For this example, init the ADC

// Step 5. User specific code, enable interrupts:

// Enable ADCINT1 in PIE
   PieCtrlRegs.PIEIER1.bit.INTx1 = 1; // Enable INT 1.1 in the PIE
   IER |= M_INT1;  // Enable CPU Interrupt 1
   EINT;           // Enable Global interrupt INTM
   ERTM;           // Enable Global realtime interrupt DBGM

   LoopCount = 0;
   ConversionCount = 0;

// Configure ADC
EALLOW;
AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch
AdcRegs.INTSEL1N2.bit.INT1E     = 1; //Enabled ADCINT1
AdcRegs.INTSEL1N2.bit.INT1CONT  = 0; //Disable ADCINT1 Continuous mode
AdcRegs.INTSEL1N2.bit.INT1SEL = 1; //setup EOC1 to trigger ADCINT1 to fire
AdcRegs.ADCSOC0CTL.bit.CHSEL  = 4; //set SOC0 channel select to ADCINA4
AdcRegs.ADCSOC1CTL.bit.CHSEL  = 2; //set SOC1 channel select to ADCINA2
AdcRegs.ADCSOC0CTL.bit.TRIGSEL  = 5; //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
AdcRegs.ADCSOC1CTL.bit.TRIGSEL  = 5; //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
AdcRegs.ADCSOC0CTL.bit.ACQPS  = 6; //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
AdcRegs.ADCSOC1CTL.bit.ACQPS  = 6; //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
EDIS;

// Assumes ePWM1 clock is already enabled in InitSysCtrl();
   EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
   EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
   EPwm1Regs.ETPS.bit.SOCAPRD  = 1; // Generate pulse on 1st event
   EPwm1Regs.CMPA.half.CMPA  = 0x0080; // Set compare A value
   EPwm1Regs.TBPRD  = 0xFFFF; // Set period for ePWM1
   EPwm1Regs.TBCTL.bit.CTRMODE  = 0; // count up and start

// Wait for ADC interrupt
   for(;;)
   {
      LoopCount++;
   }

}


interrupt void  adc_isr(void)
{

  Voltage1[ConversionCount] = AdcResult.ADCRESULT0;
  Voltage2[ConversionCount] = AdcResult.ADCRESULT1;

  // If 20 conversions have been logged, start over
  if(ConversionCount == 9)
  {
     ConversionCount = 0;
  }
  else ConversionCount++;

  AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Clear ADCINT1 flag reinitialize for next SOC
  PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE

  return;
}