请帮我看一下这个例程

这是28335的一个ADC的下载例程，但是，我看这个程序时，不知道哪一个是启动ADC的触发源，请帮忙指点一下，谢谢您！

FILE:   Example_2833xAdcSeqModeTest.c

//

// TITLE:  DSP2833x ADC Seq Mode Test.

//

// ASSUMPTIONS:

//

//    This program requires the DSP2833x header files.

//

//    Make sure the CPU clock speed is properly defined in

//    DSP2833x_Examples.h before compiling this example.

//

//    Connect the signal to be converted to channel A0.

//

//    As supplied, this project is configured for "boot to SARAM"

//    operation.  The 2833x 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_Table:

//

//         GPIO87   GPIO86     GPIO85   GPIO84

//          XA15     XA14       XA13     XA12

//           PU       PU         PU       PU

//        ==========================================

//            1        1          1        1    Jump to Flash

//            1        1          1        0    SCI-A boot

//            1        1          0        1    SPI-A boot

//            1        1          0        0    I2C-A boot

//            1        0          1        1    eCAN-A boot

//            1        0          1        0    McBSP-A boot

//            1        0          0        1    Jump to XINTF x16

//            1        0          0        0    Jump to XINTF x32

//            0        1          1        1    Jump to OTP

//            0        1          1        0    Parallel GPIO I/O boot

//            0        1          0        1    Parallel XINTF boot

//            0        1          0        0    Jump to SARAM    <- "boot to SARAM"

//            0        0          1        1    Branch to check boot mode

//            0        0          1        0    Boot to flash, bypass ADC cal

//            0        0          0        1    Boot to SARAM, bypass ADC cal

//            0        0          0        0    Boot to SCI-A, bypass ADC cal

//                                              Boot_Table_End$

//

// DESCRIPTION:

//

//    Channel A0 is converted forever and logged in a buffer (SampleTable)

//

//    Open a memory window to SampleTable to observe the buffer

//    RUN for a while and stop and see the table contents.

//

//       Watch Variables:

//          SampleTable – Log of converted values.

//

//###########################################################################

//

// Original source by: S.S.

//

// $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $

// $Release Date: August 4, 2009 $

//###########################################################################

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

// ADC start parameters

#if (CPU_FRQ_150MHZ)     // Default – 150 MHz SYSCLKOUT

 #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3)   = 25.0 MHz

#endif

#if (CPU_FRQ_100MHZ)

 #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2)   = 25.0 MHz

#endif

#define ADC_CKPS   0x1   // ADC module clock = HSPCLK/2*ADC_CKPS   = 25.0MHz/(1*2) = 12.5MHz

#define ADC_SHCLK  0xf   // S/H width in ADC module periods                        = 16 ADC clocks

#define AVG        1000  // Average sample limit

#define ZOFFSET    0x00  // Average Zero offset

#define BUF_SIZE   2048  // Sample buffer size

// Global variable for this example

Uint16 SampleTable[BUF_SIZE];

main()

{

  Uint16 i;

// Step 1. Initialize System Control:

// PLL, WatchDog, enable Peripheral Clocks

// This example function is found in the DSP2833x_SysCtrl.c file.

  InitSysCtrl();

// Specific clock setting for this example:

  EALLOW;

  SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK

  EDIS;

// Step 2. Initialize GPIO:

// This example function is found in the DSP2833x_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 DSP2833x_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 DSP2833x_DefaultIsr.c.

// This function is found in DSP2833x_PieVect.c.

  InitPieVectTable();

// Step 4. Initialize all the Device Peripherals:

// This function is found in DSP2833x_InitPeripherals.c

// InitPeripherals(); // Not required for this example

  InitAdc();  // For this example, init the ADC

// Specific ADC setup for this example:

  AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;

  AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;

  AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;        // 1  Cascaded mode

  AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;

  AdcRegs.ADCTRL1.bit.CONT_RUN = 1;       // Setup continuous run

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

// Clear SampleTable

  for (i=0; i<BUF_SIZE; i++)

  {

    SampleTable[i] = 0;

  }

  // Start SEQ1

  AdcRegs.ADCTRL2.all = 0x2000;

  // Take ADC data and log the in SampleTable array

  for(;;)

  {

    for (i=0; i<AVG; i++)

    {

       while (AdcRegs.ADCST.bit.INT_SEQ1== 0) {} // Wait for interrupt

       AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;

       SampleTable[i] =((AdcRegs.ADCRESULT0>>4) );

    }

  }

}

//===========================================================================

// No more.

//===========================================================================

这是28335的一个ADC的下载例程，但是，我看这个程序时，不知道哪一个是启动ADC的触发源，请帮忙指点一下，谢谢您！