DSP-C6000-DM642DEMO卷积运算例程

/* * Copyright 2001 by Texas Instruments Incorporated. * All rights reserved. Property of Texas Instruments Incorporated. * Restricted rights to use, duplicate or disclose this code are * granted through contract. * U.S. Patent Nos. 5,283,900 5,392,448 */ /* "@(#) DSP/BIOS 4.51.0 05-23-01 (barracuda-i10)" */ /***************************************************************************/ /* */ /* V O L U M E . C */ /* */ /* Audio gain processing in a main loop */ /* */ /***************************************************************************/ #include "stdio.h" #include "volume.h" /* Global declarations */ int inp1_buffer[BUFSIZE]; int inp2_buffer[BUFSIZE]; /* processing data buffers */ int out1_buffer[BUFSIZE]; int out2_buffer[BUFSIZE]; int out3_buffer[BUFSIZE]; int out4_buffer[BUFSIZE*2]; int size = BUFSIZE; int ain = MINGAIN; int zhy=0; int sk=64; /*sk代表所开的bufsize的大小,需修改它.输入文件sine.dat为32点,sine11.dat, sin22.dat,sin33.dat,sin44.dat为64点的输入波形.*/ /* volume control variable */ unsigned int processingLoad = 1; /* processing routine load value */ /* Functions */ extern void load(unsigned int loadValue); static int processing1(int *output1, int *output2); static int processing2(int *output2, int *output3); static int processing3(int *input1,int *output2,int *output4); static int processing4(int *input2, int *output1); static void dataIO1(void); static void dataIO2(void); /* * ======== main ======== */ void main() { int *input1 = &inp1_buffer[0]; int *input2 = &inp2_buffer[0]; int *output1 = &out1_buffer[0]; int *output2 = &out2_buffer[0]; int *output3 = &out3_buffer[0]; int *output4 = &out4_buffer[0]; puts("volume example started\n"); /* loop forever */ while(TRUE) { /* * Read input data using a probe-point connected to a host file. * Write output data to a graph connected through a probe-point. */ dataIO1(); dataIO2(); /* apply gain */ processing4(input2,output1); processing1(output1, output2); processing2(output2, output3); processing3(input1,output2,output4) ; } } /* * ======== processing ======== * * FUNCTION: apply signal processing transform to input signal. * * PARAMETERS: address of input and output buffers. * * RETURN VALUE: TRUE. */ static int processing4(int *input2,int *output1) { int m=sk; for(;m>=0;m--) { *output1++ = *input2++ * ain; } for(;(size-m)>0;m++) {output1[m]=0; } load(processingLoad); return(TRUE); } static int processing1(int *output1,int *output2) { int m=sk-1; for(;m>0;m--) { *output2++ = *output1++ * ain; } /* additional processing load */ load(processingLoad); return(TRUE); } static int processing2(int *output2, int *output3) { int n=zhy; size=BUFSIZE; for(;(size-n)>0;n++) { *output3++ = output2[n]; } /* for (;n>0;n--) { *output3++ = 0; } */ load(processingLoad); return(TRUE); } static int processing3(int *input1,int *output2,int *output4) { int m=sk; int y=zhy; int z,x,w,i,f,g; for(;(m-y)>0;) {i=y; x=0; z=0; f=y; for(;i>=0;i--) {g=input1[z]*output2[f]; x=x+g; z++; f--; } *output4++ = x; y++; } m=sk; y=sk-1; w=m-zhy-1; for(;m>0;m--) { y--; i=y; z=sk-1; x=0; f=sk-y; for(;i>0;i--,z--,f++) {g=input1[z]*output2[f]; x=x+g; } out4_buffer[w]=x; w++; } load(processingLoad); return(TRUE); } /* * ======== dataIO ======== * * FUNCTION: read input signal and write processed output signal. * * PARAMETERS: none. * * RETURN VALUE: none. */ static void dataIO1() { /* do data I/O */ return; } static void dataIO2() { /* do data I/O */ return; }