example_281xadcsoc.c

2812-svpwm

//###########################################################################
//
// FILE:   Example_281xAdc.c
//
// TITLE:  DSP281x ADC Example Program.
//
// ASSUMPTIONS:
//
//   This program requires the DSP281x V1.00 header files.  
//   As supplied, this project is configured for "boot to H0" operation.
//
//   Make sure the CPU clock speed is properly defined in 
//   DSP281x_Examples.h before compiling this example.
//
//   Connect signals to be converted to A2 and A3.
//  
//
// 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 Exterenal     
//   is setup to generate a periodic ADC SOC on SEQ1. Two channels    
//   are converted, ADCINA3 and ADCINA2.
//
//   Watch Variables:
// 
//         Frequence[10]     Last 10 ADCRESULT0 values
//         Voltage[10]       Last 10 ADCRESULT1 values
//         ConversionCount  Current result number 0-9
//         LoopCount        Idle loop counter  
//         
//
//###########################################################################
//
// Original Author: D.F.
// 
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  1.00| 11 Sep 2003 | L.H. | Changes since previous version (v.58 Alpha)
//      |             |      | Cleanup only.  Results are shifted >> 4
//###########################################################################

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File

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

// Global variables used in this example:
Uint16 LoopCount;
Uint16 ConversionCount;
extern Uint16 Frequence;//5,10,15,20,25,30,35,40,45,50Hz:
extern Uint16 Voltage;  //30,49,66,88,110,154,176,180,220v:


void DSP281x_ADCIO()
{


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



// Enable ADCINT in PIE
   PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
   IER |= M_INT1; // Enable CPU Interrupt 1
   EINT;          // Enable Global interrupt INTM
   ERTM;          // Enable Global realtime interrupt DBGM

   LoopCount = 0;
   ConversionCount = 0;
    
// Configure ADC:start/stop mode
   AdcRegs.ADCMAXCONV.all = 0x0000;       // Setup 2 conv's on SEQ1
   AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.
  
   AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1 = 1;  // Enable EXTSOC to start SEQ1
   AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1;  // Enable SEQ1 interrupt (every EOS)
     

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

}


interrupt void  adc_isr(void)  // interrupt :Keyword?
{

  Ferquence =(Uint16)((AdcRegs.ADCRESULT0 >>6)/81.6);
  Voltage =(Uint16)(4.4*Frequence);

  // If 40 conversions have been logged, start over
  if(ConversionCount == 1) 
  {
     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;
}