Yann Garcia / SignalGenerator

This library provides a class to generate differents signale wave form. Note that the maximum update rate of 1 MHz, so Fmax = 1MHz / _num_pixels (see UM10360 - Chapter 30: LPC17xx Digital-to-Analog Converter (DAC).

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SignalGenerator Class Reference
Public Types | Public Member Functions

SignalGenerator Class Reference

This class provides methods to generate differents signale wave form. More...

#include <SignalGenerator.h>

Public Types

enum  SignalGeneratorType
 

List of supported signals.

More...

Public Member Functions

 SignalGenerator (PinName p_outPort)
 Default ctor.
virtual ~SignalGenerator ()
 Default dtor.
void SetSignalFrequency (SignalGenerator::SignalGeneratorType p_signalType=SignalGenerator::SquareSignal, int p_frequency=1000, int p_num_pixels=64)
 Set the frequency of the signal.
void Run ()
 Generate the signal in synchrnous mode.
void Stop ()
 Method called to terminate synchronous running mode.
int BeginRunAsync ()
 Method called to prepare an asynchronous running mode.
void RunAsync ()
 Method called to launch the asynchronous running mode.
void EndRunAsync ()
 Method called to terminate asynchronous running mode.

Detailed Description

This class provides methods to generate differents signale wave form.

V0.0.0.2

Note that the maximum update rate of 1 MHz, so Fmax = 1MHz / _num_pixels

Note that Vout is given by the relation below (UM10360 - Table 537. D/A Pin Description): Vout = VALUE * ((Vrefp - Vrefn) / 1024) + Vrefn in which:

  • Vrefp: tied to VDD (e.g. 3.3V)
  • Vrefn: tied to Vss
    See also:
    UM10360 - Chapter 30: LPC17xx Digital-to-Analog Converter (DAC)
    Remarks:
    This class was validated with Tektronix TDS2014 oscilloscope
    Author:
    Yann Garcia (Don't hesitate to contact me: garcia.yann@gmail.com) References:

http://fabrice.sincere.pagesperso-orange.fr/cm_electronique/projet_pic/gbf/gbf.htm

Definition at line 44 of file SignalGenerator.h.

Member Enumeration Documentation

enum SignalGeneratorType

List of supported signals.

Definition at line 49 of file SignalGenerator.h.

Constructor & Destructor Documentation

SignalGenerator ( PinName  p_outPort )

Default ctor.

Initialize the internal datas. Default values are:

  • signal type: SquareSignal
  • frequency: 1000Hz
  • # of pixels is fixed, _twait is adjusted
Parameters:
p_outPort,:Pin name of the Analog out port (e.g. p18 for LPC1768)

Definition at line 5 of file SignalGenerator.cpp.

~SignalGenerator (  ) [virtual]

Default dtor.

Free resources

Definition at line 13 of file SignalGenerator.cpp.

Member Function Documentation

int BeginRunAsync (  )

Method called to prepare an asynchronous running mode.

Returns:
0 on success, -1 if _twait less that 7us. On error, you shall use synchronous method

Definition at line 83 of file SignalGenerator.cpp.

void EndRunAsync (  )

Method called to terminate asynchronous running mode.

Definition at line 103 of file SignalGenerator.cpp.

void Run (  )

Generate the signal in synchrnous mode.

See also:
Stop() method

Definition at line 64 of file SignalGenerator.cpp.

void RunAsync (  )

Method called to launch the asynchronous running mode.

Definition at line 95 of file SignalGenerator.cpp.

void SetSignalFrequency ( SignalGenerator::SignalGeneratorType  p_signalType = SignalGenerator::SquareSignal,
int  p_frequency = 1000,
int  p_num_pixels = 64 
)

Set the frequency of the signal.

Parameters:
p_signalType,:Signal type. Default value is square signal
p_frequency,:Signal frequency. Default value is 1000Hz
p_num_pixels,:Number of pixels ber period. Default value is 64
See also:
UM10360 - Chapter 30: LPC17xx Digital-to-Analog Converter (DAC) 
 // Prepare a sinus signal at 500Hz
 signal.SetSignalFrequency(SignalGenerator::SinusSignal,500);
 // Launch execution
 signal.BeginRunAsync();
 // Here signal generation is running. Use Led or oscilloscope to vizualize output
 printf("Press any key to terminate");
 getchar();
 // Terminate execution
 signal.EndRunAsync();

Definition at line 19 of file SignalGenerator.cpp.

void Stop (  )

Method called to terminate synchronous running mode.

Definition at line 77 of file SignalGenerator.cpp.

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