int main(void) {
DisableDog();
CPUinit();
EALLOW;
outputEnable();
LCDinit();
LCDclear();
initADC();
DAC_init();
// SRAMwrite(0);
// SRAMaddress = 0x260000; //shouldn't need SRAM here
fft_init();
initBuffers();
timerINIT(ISRvalue, samplingRate);
while(1){
if(sampleBufferFull){
fft.InBuf = &sampleBuffer[0];
int i;
for(i = 0;i<FFT_SIZE;i++){
outBuffer[i] = 0;
}
for(i=0;i<FFT_SIZE/2;i++){
MagBuffer[i] = 0;
}
RFFT_f32(&fft);
//fft.MagBuf = &sampleBuffer[0];
RFFT_f32_mag(&fft);
sampleBufferFull = 0;
EINT;
}
else{
//do nothing
}
}
return 0;
}
void main(void)
{
Uint16 i;
InitSysCtrl();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
// Clear input buffers:
for(i=0; i < RFFT_SIZE; i++)
{
RFFTin1Buff[i] = 0.0f;
}
// Generate sample waveforms:
Rad = 0.0f;
for(i=0; i < RFFT_SIZE; i++)
{
RFFTin1Buff[i] = sin(Rad) + cos(Rad*2.3567); //Real input signal
//FFTImag_in[i] = cos(Rad*8.345) + sin(Rad*5.789);
Rad = Rad + RadStep;
}
rfft.FFTSize = RFFT_SIZE;
rfft.FFTStages = RFFT_STAGES;
rfft.InBuf = &RFFTin1Buff[0]; //Input buffer
rfft.OutBuf = &RFFToutBuff[0]; //Output buffer
rfft.CosSinBuf = &RFFTF32Coef[0]; //Twiddle factor buffer
rfft.MagBuf = &RFFTmagBuff[0]; //Magnitude buffer
RFFT_f32_sincostable(&rfft); //Calculate twiddle factor
for (i=0; i < RFFT_SIZE; i++)
{
RFFToutBuff[i] = 0; //Clean up output buffer
}
for (i=0; i < RFFT_SIZE/2; i++)
{
RFFTmagBuff[i] = 0; //Clean up magnitude buffer
}
RFFT_f32(&rfft); //Calculate real FFT
// OutBuf[0] = real[0]
// OutBuf[1] = real[1]
// OutBuf[2] = real[2]
// ………
// OutBuf[N/2] = real[N/2]
// OutBuf[N/2+1] = imag[N/2-1]
// ………
// OutBuf[N-3] = imag[3]
// OutBuf[N-2] = imag[2]
// OutBuf[N-1] = imag[1]
//
RFFT_f32_mag(&rfft); //Calculate magnitude
// MagBuf[0] = magnitude[0]
// MagBuf[1] = magnitude[1]
// MagBuf[2] = magnitude[2]
// ………
// MagBuf[N/2] = magnitude[N/2]
// MagBuf[N/2+1] = magnitude[N/2+1]
// rfft.PhaseBuf = &RFFTmagBuff[0]; //Use magnitude buffer
// RFFT_f32_phase(&rfft); //Calculate phase
// Just sit and loop forever (optional):
for(;;);
} //End of main
