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| author | unknown <dm2515@eews303a-028.ic.ac.uk> | 2018-01-31 10:57:11 +0000 |
|---|---|---|
| committer | unknown <dm2515@eews303a-028.ic.ac.uk> | 2018-01-31 10:57:11 +0000 |
| commit | b3da85af53160023196b77b279a8002bee6e765f (patch) | |
| tree | 805d66d6e1b490229e3cf52951c138cd64deb1eb /lab4/RTDSP/intio.c | |
| parent | 31ad436cb4cc0fb9a553f03e12d9c8104b8f2547 (diff) | |
| download | NoiseSilencer-b3da85af53160023196b77b279a8002bee6e765f.tar.gz NoiseSilencer-b3da85af53160023196b77b279a8002bee6e765f.zip | |
Ex2
Diffstat (limited to 'lab4/RTDSP/intio.c')
| -rw-r--r-- | lab4/RTDSP/intio.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/lab4/RTDSP/intio.c b/lab4/RTDSP/intio.c index 3798072..9992d4a 100644 --- a/lab4/RTDSP/intio.c +++ b/lab4/RTDSP/intio.c @@ -44,7 +44,8 @@ // PI defined here for use in your code #define PI 3.141592653589793 #define N 249 -double x[N]; +double buffer[N]; +unsigned int ptr = N-1; /******************************* Global declarations ********************************/ @@ -125,20 +126,16 @@ void init_HWI() /******************** INTERRUPT SERVICE ROUTINE ***********************/ void ISR_AIC() { - unsigned int i; short sample_in, sample_out; sample_in = mono_read_16Bit(); - - for (i = N-1; i > 0; i--) { - x[i] = x[i-1]; - } - x[0] = (float) sample_in / 32767.f; - + buffer[ptr] = (float) sample_in / 32767.f; sample_out = non_circ_fir(); - mono_write_16Bit(sample_out); -// mono_write_16Bit(sample_in); + + ptr--; + if (ptr == 0) + ptr = N-1; } // Perform linear convolution @@ -149,7 +146,7 @@ short non_circ_fir() int M, i; M = sizeof(b) / sizeof(b[0]); for(i = 0; i < N; i++) { - y += x[i] * b[M-i-1]; + y += buffer[i] * b[M-i-1]; } return y*32767; } |