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PIC24F ADC library with callback

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Author: Anton Rieckert

Last Updated: 2016-02-22

Package Version: 1.0.0.0

Category: Internal MCU modules

Downloaded: 1313 times

Followed by: 2 users

License: MIT license  

Analog to Digital Library for the PIC24 and dsPIC range. Library supports multiple channels and has a callback function that is executed as soon as all the channels are read. The sampling frequency can also be specified in Hz

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Example

program ADCExample;
uses libADC;

//==============================================================================
procedure InitCPU;
begin
  // Disable all ADC
  AD1PCFG := 0xFFFF;

  TRISA := 0x0004;
  TRISB := 0x0015;
end;

//==============================================================================
procedure SamplesReadyCallback(ANumOfSamples : word; var ASamples : array[16] of word);
var
  i   : word;
  txt : string[20];
begin
  // This function is called every Afs milliseconds
  // The ANumberOfSamples would be the same as the number of Achannels you 
  // specified in the init function
  
  // ASamples is an array containing the sampled values
  for i := 0 to ANumOfSamples - 1 do
  begin
    // Do something with your sampled values
    UART1_Write_Text('Channel ' + char(i + 1 + 48) + ': ');
    WordToStr(ASamples[i], txt);
    UART1_Write_Text(txt + #13 + #10);
  end;
end;

//==============================================================================
begin
  InitCPU;

  // Init the UART comms port
  UART1_Init(19200);
  UART1_Write_Text('Hello, this is the ADC test program' + #13 + #10);

  // Init the ADC (3 parameters - channel mask, sample time, callback)
  // Achannles - Channel mask of the channels you want to read
  // Afs - sample frequency (Hz)
  // aCallback - callback function when samples are ready
  ADC_Init(0x0003, 800, @SamplesReadyCallback);
  
  // In this example we read AN0 and AN1 (0x0003)
  // Every 800Hz or 1.25ms
  // And call SamplesReadyCallback function with the values
  
  // To read for example AN0, AN1 and AN6 the Achannels would be 0x0043

  ADC_Enable;
  ADC_StartSample;

  // Endless loop or your main program
  // The ADC library will call the callback function
  while true do;
end.

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