diff options
Diffstat (limited to 'lab4/RTDSP/intio.c')
| -rw-r--r-- | lab4/RTDSP/intio.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/lab4/RTDSP/intio.c b/lab4/RTDSP/intio.c index 5e0b11a..124fc03 100644 --- a/lab4/RTDSP/intio.c +++ b/lab4/RTDSP/intio.c @@ -45,7 +45,7 @@ #define PI 3.141592653589793 #define N 249 double buffer[N]= {0}; -unsigned int ptr = N-1; +unsigned ptr = N-1; /******************************* Global declarations ********************************/ @@ -126,13 +126,8 @@ void init_HWI() /******************** INTERRUPT SERVICE ROUTINE ***********************/ void ISR_AIC() { - short sample_in, sample_out; - - sample_in = mono_read_16Bit(); - buffer[ptr] = (double) sample_in / 30000.0; - sample_out = circ_fir(); - mono_write_16Bit(sample_out); - + buffer[ptr] = (double) mono_read_16Bit(); + mono_write_16Bit((short)circ_fir()); if (ptr == 0) ptr = N; ptr--; @@ -142,9 +137,12 @@ void ISR_AIC() short circ_fir() { double y = 0; - int i; - for(i = 0; i < N; i++) { - y += buffer[(i+ptr)%N] * b[N-i-1]; + int i = 0; + for(; i+ptr < N; i++) { + y += buffer[i+ptr] * b[N-i-1]; } - return y*30000; + for(; i < N; i++) { + y += buffer[i+ptr-N] * b[N-i-1]; + } + return y; } |