example_28xadc.c

TI公司的2812dsp所有程序

//
//###########################################################################
//
// FILE:	Example_28xAdc.c
//
// TITLE:	DSP28 ADC Example Program.
//
// ASSUMPTIONS:
//
//          This program requires the DSP28 header files.  To compile the
//          program as is, it should reside in the DSP28/examples/adc 
//          sub-directory.
//
//          As supplied, this project is configured for "boot to H0" operation.  
//
// DESCRIPTION:
//
//   This example sets up the PLL in x10/2 mode, divides SYSCLKOUT    
//   by six to reach a 25Mhz HSPCLK (assuming a 30Mhz XCLKIN). The    
//   clock divider in the ADC is not used so that the ADC will see    
//   the 25Mhz on the HSPCLK. Interrupts are enabled and the EVA      
//   is setup to generate a periodic ADC SOC on SEQ1. Two channels    
//   are converted, ADCINA3 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  
//         
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.58| 18 Jun 2002 | D.F. | Original Release
//###########################################################################

// Step 0.  Include required header files
         // DSP28_Device.h: device specific definitions #include statements for
         // all of the peripheral .h definition files.
         // DSP28_Example.h is specific for the given example.  

#include "DSP28_Device.h"

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

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


main() 
{

// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
   // This function is found in the DSP28_SysCtrl.c file.
   InitSysCtrl();

   // For this example, set HSPCLK to SYSCLKOUT / 6 (25Mhz assuming 150Mhz SYSCLKOUT)
   EALLOW;
   SysCtrlRegs.HISPCP.all = 0x3;	// HSPCLK = SYSCLKOUT/6
   EDIS;
   
// Step 2. Select GPIO for the device or for the specific application:
   // This function is found in the DSP28_Gpio.c file.
   // InitGpio();  // Not required for this example
   

// Step 3. Initialize PIE vector table:
    // The PIE vector table is initialized with pointers to shell Interrupt 
    // Service Routines (ISR).  The shell routines are found in DSP28_DefaultIsr.c.
    // Insert user specific ISR code in the appropriate shell ISR routine in 
    // the DSP28_DefaultIsr.c file.

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

    // Initialize Pie Control Registers To Default State:
    // This function is found in the DSP28_PieCtrl.c file.
	InitPieCtrl();

    // Initialize the PIE Vector Table To a Known State:
    // This function is found in DSP28_PieVect.c.
    // This function populates the PIE vector table with pointers
    // to the shell ISR functions found in DSP28_DefaultIsr.c.
	InitPieVectTable();	

// Step 4. Initialize all the Device Peripherals to a known state:
    // This function is found in DSP28_InitPeripherals.c
    // InitPeripherals();  // For this example just init the ADC
    InitAdc();    // DSP28_Adc.c

// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
	
    // Reassign ADC ISR. 
    // Reassign the PIE vector for the ADC to point to a different ISR then
    // the shell routine found in DSP28_DefaultIsr.c.
    // This is done if the user does not want to use the shell ISR routine
    // but instead wants to use their own ISR.  This step is optional:
	
	EALLOW;	// This is needed to write to EALLOW protected registers
	PieVectTable.ADCINT = &adc_isr;
	EDIS;       // This is needed to disable write to EALLOW protected registers

    // Include application specific functions. This is for this example:

    // Enable ADCINT in PIE
    PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
    
    // Enable CPU Interrupt 1
    IER |= M_INT1;									// Enable Global INT1

    // Enable global Interrupts and higher priority real-time debug events:
	
	EINT;   // Enable Global interrupt INTM
	ERTM;	  // Enable Global realtime interrupt DBGM

    LoopCount = 0;
    ConversionCount = 0;
    
    // Configure ADC
    AdcRegs.ADCMAXCONV.all = 0x0001;       // Setup 2 conv's on SEQ1
    AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.
    AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x2; // Setup ADCINA2 as 2nd SEQ1 conv.
    AdcRegs.ADCTRL2.bit.EVA_SOC_SEQ1 = 1;  // Enable EVASOC to start SEQ1
    AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1;  // Enable SEQ1 interrupt (every EOS)

    // Configure EVA
    // Assumes EVA Clock is already enabled in InitSysCtrl();
    EvaRegs.T1CMPR = 0x0080;               // Setup T1 compare value
    EvaRegs.T1PR = 0xFFFF;                 // Setup period register
    EvaRegs.GPTCONA.bit.T1TOADC = 1;       // Enable EVASOC in EVA
    EvaRegs.T1CON.all = 0x1042;            // Enable timer 1 compare (upcount mode)

    // Wait for ADC interrupt
    while (1)
    {
       LoopCount++;
    }

}


interrupt void  adc_isr(void)
{

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

  // If 40 conversions have been logged, start over
  if(ConversionCount == 9) 
  {
     ConversionCount = 0;
  }
  else ConversionCount++;

  // Reinitialize for next ADC sequence
  AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;         // Reset SEQ1
  AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;		// Clear INT SEQ1 bit
  PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE
  
  return;
}