int main (void)
{
char *cp;
uint16_t m, n, s;
uint16_t t1,t2,t3;
DDRE = 0b00000010; /* PE1:<conout>, PE0:<conin> in N81 38.4kbps */
TCCR1B = 3; /* clk/64 */
xmitstr(PSTR("\r\nFFT sample program\r\n"));
for(;;) {
xmitstr(PSTR("\r\n>")); /* Prompt */
rcvrstr(pool, sizeof(pool)); /* Console input */
cp = pool;
switch (*cp++) { /* Pick a header char (command) */
case '\0' : /* Blank line */
break;
case 'w' : /* w: show waveform */
capture_wave(capture, FFT_N);
for (n = 0; n < FFT_N; n++) {
s = capture[n];
xmitf(PSTR("\r\n%4u:%6d "), n, s);
s = (s + 32768) / 1024;
for (m = 0; m < s; m++) xmit(' ');
xmit('*');
}
break;
case 's' : /* s: show spectrum */
capture_wave(capture, FFT_N);
TCNT1 = 0; /* performance counter */
fft_input(capture, bfly_buff);
t1 = TCNT1; TCNT1 = 0;
fft_execute(bfly_buff);
t2 = TCNT1; TCNT1 = 0;
fft_output(bfly_buff, spektrum);
t3 = TCNT1;
for (n = 0; n < FFT_N / 2; n++) {
s = spektrum[n];
xmitf(PSTR("\r\n%4u:%5u "), n, s);
s /= 512;
for (m = 0; m < s; m++) xmit('*');
}
xmitf(PSTR("\r\ninput=%u, execute=%u, output=%u (x64clk)"), t1,t2,t3);
break;
default : /* Unknown command */
xmitstr(PSTR("\n???"));
}
}
}
int main (void)
{
initTimer();
initLeds();
loggerInit();
loggerWriteToMarker((LogMesT)"\r\nFFT sample program\r\n*", '*');
loggerWriteToMarker((LogMesT)"\r\n>*", '*'); /* Prompt */
for(;;) {
capture_wave(capture, FFT_N);
fft_input(capture, bfly_buff);
fft_execute(bfly_buff);
fft_output(bfly_buff, spektrum);
_delay_ms(50);
}
}
