28335的ADC的下载例程，请问是哪一个启动ADC的触发源？

本帖最后由 一只耳朵怪 于 2018-6-13 16:06 编辑

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   [
    SampleTable = 0;
  ]
  // Start SEQ1
  AdcRegs.ADCTRL2.all = 0x2000;
  // Take ADC data and log the in SampleTable array
  for(;;)
  [
    for (i=0; i     [
       while (AdcRegs.ADCST.bit.INT_SEQ1== 0) [] // Wait for interrupt
       AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
       SampleTable =((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！

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