Page 250 - ARM Based Microcontroller Projects Using MBED
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236 8. INTERMEDIATE LEVEL PROJECTS
/*************************************************************************
ARBITRARY PERIODIC WAVEFORM
===========================
In this program an arbitrary periodic waveform is generated with a period
of 20ms. The details of teh waveform are given in the text.
Author: Dogan Ibrahim
Date : August 2018
File : Arbitrary
**************************************************************************/
#include "mbed.h"
Serial MyPC(USBTX, USBRX);
AnalogOut aout(PA_4);
float Waveform[] = {0.0,0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.6,1.6,1.6,1.6,
1.4,1.2,1.0,0.8,0.6,0.4,0.2,0.0};
//
// This function generates V voltage at the DAC port
//
void GenerateV(float V)
{
aout = V / 3.3f;
}
int main()
{
int k;
while(1) // Do forever
{
for(k = 0; k <= 20; k++) // Get waveform samples
{
GenerateV(Waveform[k]); // Generate waveform
wait_ms(1.0); // Wait 1ms
}
}
}
FIG. 8.110 Program listing.
8.33.3 Circuit Diagram
In this project, analog input PA_4 is used as in the previous project.
8.33.4 The PDL
Fig. 8.112 shows the PDL of the program.
