Page 254 - ARM Based Microcontroller Projects Using MBED

240 8. INTERMEDIATE LEVEL PROJECTS

inc = amplitude / Steps;
dly = Period / Steps;
dly = dly / 1000.0f; // in seconds

while(1) // Do forever
{
for(k = 0.0f; k <= amplitude; k = k + inc)
{
aout = k; // Analog out
wait(dly); // Wait dly sec
}
}
}

//
// This function generates a Triangular waveform. The required number
// of staps and the period are arguments of the function
//
void GenerateTriangular(float Amp, int Steps, float Period)
{
float k, amplitude, inc, dly;

amplitude = Amp / 3.3f; // Required amplitude
inc = amplitude / Steps;
dly = Period / Steps / 2;
dly = dly / 1000.0f; // in seconds

while(1) // Do forever
{
for(k = 0.0f; k <= amplitude; k = k + inc) // Rising
{
aout = k; // Analog out
wait(dly); // Wait dly sec
}

for(k = amplitude; k > 0; k = k - inc) // Falling
{
aout = k; // Analog out
wait(dly); // Wait dly sec
}
}

}

//
// This function generates a Sine waveform. The required number
// of staps and the period are arguments of the function
//
void GenerateSine(float Amp, int Steps, float Period)
{
float k, amplitude, inc, dly;
float Pi = 3.14159;
FIG. 8.113, CONT’D
(Continued)