Page 253 - ARM Based Microcontroller Projects Using MBED

8.33 PROJECT 28—WAVEFORM GENERATOR 239
/*************************************************************************

WAVEFORM GENERATOR
==================
This program generates fixed voltage, sawtooth waveform, triangular
waveform, sine waveform, and arbitrary waveform. The parameters of
each type of waveform are entered from the keyboard
Author: Dogan Ibrahim
Date : August 2018
File : Waveform
**************************************************************************/
#include "mbed.h"
Serial MyPC(USBTX, USBRX);
AnalogOut aout(PA_4);

//
// Clear the screen
//
void clrscr()
{
char clrscr[] = {0x1B, '[', '2' , 'J',0};
MyPC.printf(clrscr);
}

//
// Home the cursor
//
void homescr()
{
char homescr[] = {0x1B, '[' , 'H' , 0};
MyPC.printf(homescr);
}

//
// This function generates fixed voltage at the DAC port
//
void GenerateFixed(float V)
{
aout = V / 3.3f;
}
//
// This function generates a Sawtooth waveform. The required number
// of staps and the period are arguments of the function
//
void GenerateSawtooth(float Amp, int Steps, float Period)
{
float k, amplitude, inc, dly;

amplitude = Amp / 3.3f; // Required amplitude
FIG. 8.113 Program listing.
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