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Hi,
I am using the the algorithm of IIR filter to generate a sine wave. However, in a debugging mode I see a triangle waveform in graph window. Any clues?
volatile short output[16];
main()
{
unsigned int counter = 0;
const short A=0x7e66; /* A=(1.975/2 * 32768) */
short y[3]={0,0x1209,0}; /* (y0,y1,y2), y1=(0.1409*32768) */
for (;;)
{
y[0] = (((A*y[1])>>15) + ((A*y[1])>>15)) - y[2];
y[2] = y[1]; /* y2 <–– y1 */
y[1] = y[0]; /* y1 <–– y0 */
output[counter] = y[2];
if((counter % 16) == 15)
{
counter = 0;
}
else
{
counter++;
}
}
}Thanks,
Lukasz
