/
xpmr.c
3517 lines (3047 loc) · 83.5 KB
/
xpmr.c
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/*
* xpmr.c - Xelatec Private Mobile Radio Processes
*
* All Rights Reserved. Copyright (C)2007-2009, Xelatec, LLC
*
* 20070808 1235 Steven Henke, W9SH, sph@xelatec.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This version may be optionally licenced under the GNU LGPL licence.
*
* A license has been granted to Digium (via disclaimer) for the use of
* this code.
* A license has been granted to Digium (via disclaimer) for the use of
* this code.
*
* 20160829 inad added rxlpf rxhpf txlpf txhpf
* 20161024 inad fixed set the number of coefficients
* 20161027 WN3A allow filters of different tap counts
* 20090725 2039 sph@xelatec.com improved rxfrontend and squelch
*/
/*! \file
*
* \brief Private Land Mobile Radio Channel Voice and Signaling Processor
*
* \author Steven Henke, W9SH <sph@xelatec.com> Xelatec, LLC
*/
/*
FYI = For Your Information
PMR = Private Mobile Radio
RX = Receive
TX = Transmit
CTCSS = Continuous Tone Coded Squelch System
TONE = Same as above.
LSD = Low Speed Data, subaudible signaling. May be tones or codes.
VOX = Voice Operated Transmit
DSP = Digital Signal Processing
LPF = Low Pass Filter
FIR = Finite Impulse Response (Filter)
IIR = Infinite Impulse Response (Filter)
*/
// XPMR_FILE_VERSION(__FILE__, "$Revision: 491 $")
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
#if GCC_VERSION > 40600
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsequence-point"
#endif
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/time.h>
#include <stdlib.h>
#include <errno.h>
#include "xpmr.h"
#include "xpmr_coef.h"
#include "sinetabx.h"
static i16 pmrChanIndex=0; // count of created pmr instances
//static i16 pmrSpsIndex=0;
#if (DTX_PROG == 1) || XPMR_PPTP == 1
static int ppdrvdev=0;
#endif
/*
Trace Routines
*/
void strace(i16 point, t_sdbg *sdbg, i16 index, i16 value)
{
// make dbg_trace buffer in structure
if(!sdbg->mode || sdbg->point[point]<0){
return;
} else {
sdbg->buffer[(index*XPMR_DEBUG_CHANS) + sdbg->point[point]] = value;
}
}
/*
*/
void strace2(t_sdbg *sdbg)
{
int i;
for(i=0;i<XPMR_DEBUG_CHANS;i++)
{
if(sdbg->source[i])
{
int ii;
for(ii=0;ii<SAMPLES_PER_BLOCK;ii++)
{
sdbg->buffer[ii*XPMR_DEBUG_CHANS + i] = sdbg->source[i][ii];
}
}
}
}
#if XPMR_PPTP == 1
/*
Hardware Trace Signals via the PC Parallel Port
*/
void pptp_init (void)
{
if (ppdrvdev == 0)
ppdrvdev = open("/dev/ppdrv_device", 0);
if (ppdrvdev < 0)
{
ast_log(LOG_ERROR, "open /dev/ppdrv_ppdrvdev returned %i\n",ppdrvdev);
exit(0);
}
ioctl(ppdrvdev, PPDRV_IOC_PINMODE_OUT, DTX_CLK | DTX_DATA | DTX_ENABLE | DTX_TXPWR | DTX_TX | DTX_TP1 | DTX_TP2);
ioctl(ppdrvdev, PPDRV_IOC_PINCLEAR, DTX_CLK | DTX_DATA | DTX_ENABLE | DTX_TXPWR | DTX_TX | DTX_TP1 | DTX_TP2);
}
/*
*/
void pptp_write(i16 bit, i16 state)
{
if(bit==0)
{
if(state)ioctl(ppdrvdev,PPDRV_IOC_PINSET,DTX_TP1);
else ioctl(ppdrvdev,PPDRV_IOC_PINCLEAR,DTX_TP1);
}
else
{
if(state)ioctl(ppdrvdev,PPDRV_IOC_PINSET,DTX_TP2);
else ioctl(ppdrvdev,PPDRV_IOC_PINCLEAR,DTX_TP2);
}
}
#endif
/*
take source string allocate and copy
copy is modified, delimiters are replaced with zeros to mark
end of string
count set pointers
string_parse( char *src, char *dest, char **sub)
*/
i16 string_parse(char *src, char **dest, char ***ptrs)
{
char *p,*pd;
char *ptstr[1000];
i16 i, slen, numsub;
TRACEJ(2,("string_parse(%s)\n",src));
slen=strlen(src);
TRACEJ(2,(" source len = %i\n",slen));
pd=*dest;
if(pd) free(pd);
pd=calloc(slen+1,1);
memcpy(pd,src,slen);
*dest=pd;
p=0;
numsub=0;
for(i=0;i<slen+1;i++)
{
TRACEJ(5,(" pd[%i] = %c\n",i,pd[i]));
if( p==0 && pd[i]!=',' && pd[i]!=' ' )
{
p=&(pd[i]);
}
else if(pd[i]==',' || pd[i]==0 )
{
ptstr[numsub]=p;
pd[i]=0;
p=0;
numsub++;
}
}
for(i=0;i<numsub;i++)
{
TRACEJ(5,(" ptstr[%i] = %p %s\n",i,ptstr[i],ptstr[i]));
}
if(*ptrs)free(*ptrs);
*ptrs=calloc(numsub, sizeof(char*));
for(i=0;i<numsub;i++)
{
(*ptrs)[i]=ptstr[i];
TRACEJ(5,(" %i = %s\n",i,(*ptrs)[i]));
}
TRACEJ(5,("string_parse()=%i\n\n",numsub));
return numsub;
}
/*
the parent program defines
pRxCodeSrc and pTxCodeSrc string pointers to the list of codes
pTxCodeDefault the default Tx Code.
*/
i16 code_string_parse(t_pmr_chan *pChan)
{
i16 i, ii, hit, ti;
char *p;
float f, maxctcsstxfreq;
t_pmr_sps *pSps;
i16 maxctcssindex;
TRACEF(1,("code_string_parse(%i)\n",0));
TRACEF(1,("pChan->pRxCodeSrc %s \n",pChan->pRxCodeSrc));
TRACEF(1,("pChan->pTxCodeSrc %s \n",pChan->pTxCodeSrc));
TRACEF(1,("pChan->pTxCodeDefault %s \n",pChan->pTxCodeDefault));
//printf("code_string_parse() %s / %s / %s / %s \n",pChan->name, pChan->pTxCodeDefault,pChan->pTxCodeSrc,pChan->pRxCodeSrc);
maxctcssindex=CTCSS_NULL;
maxctcsstxfreq=CTCSS_NULL;
pChan->txctcssdefault_index=CTCSS_NULL;
pChan->txctcssdefault_value=CTCSS_NULL;
pChan->b.ctcssRxEnable=pChan->b.ctcssTxEnable=0;
pChan->b.dcsRxEnable=pChan->b.dcsTxEnable=0;
pChan->b.lmrRxEnable=pChan->b.lmrTxEnable=0;
pChan->b.mdcRxEnable=pChan->b.mdcTxEnable=0;
pChan->b.dstRxEnable=pChan->b.dstTxEnable=0;
pChan->b.p25RxEnable=pChan->b.p25TxEnable=0;
if(pChan->spsLsdGen){
pChan->spsLsdGen->enabled=0;
pChan->spsLsdGen->state=0;
}
TRACEF(1,("code_string_parse(%i) 05\n",0));
pChan->numrxcodes = string_parse( pChan->pRxCodeSrc, &(pChan->pRxCodeStr), &(pChan->pRxCode));
pChan->numtxcodes = string_parse( pChan->pTxCodeSrc, &(pChan->pTxCodeStr), &(pChan->pTxCode));
if(pChan->numrxcodes!=pChan->numtxcodes)printf("ERROR: numrxcodes != numtxcodes \n");
pChan->rxCtcss->enabled=0;
pChan->rxCtcss->gain=1*M_Q8;
pChan->rxCtcss->limit=8192;
pChan->rxCtcss->input=pChan->pRxLsdLimit;
pChan->rxCtcss->decode=CTCSS_NULL;
pChan->rxCtcss->testIndex=0;
if(!pChan->rxCtcss->testIndex)pChan->rxCtcss->testIndex=3;
pChan->rxctcssfreq[0]=0; // decode now CTCSS_RXONLY
for(i=0;i<CTCSS_NUM_CODES;i++)
{
pChan->rxctcss[i]=0;
pChan->txctcss[i]=0;
pChan->rxCtcssMap[i]=CTCSS_NULL;
}
TRACEF(1,("code_string_parse(%i) 10\n",0));
#ifdef XPMRX_H
xpmrx(pChan,XXO_LSDCODEPARSE);
#endif
// Do Receive Codes String
for(i=0;i<pChan->numrxcodes;i++)
{
i16 ii,ri,ti;
float f;
p=pChan->pStr=pChan->pRxCode[i];
#ifdef HAVE_XPMRX
if(!xpmrx(pChan,XXO_LSDCODEPARSE_1))
#endif
{
sscanf(p,"%f",&f);
ri=CtcssFreqIndex(f);
if(ri>maxctcssindex)maxctcssindex=ri;
sscanf(pChan->pTxCode[i],"%f",&f);
ti=CtcssFreqIndex(f);
if(f>maxctcsstxfreq)maxctcsstxfreq=f;
if(ri>CTCSS_NULL && ti>CTCSS_NULL)
{
pChan->b.ctcssRxEnable=pChan->b.ctcssTxEnable=1;
pChan->rxCtcssMap[ri]=ti;
pChan->numrxctcssfreqs++;
TRACEF(1,("pChan->rxctcss[%i]=%s pChan->rxCtcssMap[%i]=%i\n",i,pChan->rxctcss[i],ri,ti));
}
else if(ri>CTCSS_NULL && f==0)
{
pChan->b.ctcssRxEnable=1;
pChan->rxCtcssMap[ri]=CTCSS_RXONLY;
pChan->numrxctcssfreqs++;
TRACEF(1,("pChan->rxctcss[%i]=%s pChan->rxCtcssMap[%i]=%i RXONLY\n",i,pChan->rxctcss[i],ri,ti));
}
else
{
pChan->numrxctcssfreqs=0;
for(ii=0;ii<CTCSS_NUM_CODES;ii++) pChan->rxCtcssMap[ii]=CTCSS_NULL;
TRACEF(1,("WARNING: Invalid Channel code detected and ignored. %i %s %s \n",i,pChan->pRxCode[i],pChan->pTxCode[i]));
}
}
}
TRACEF(1,("code_string_parse() CTCSS Init Struct %i %i\n",pChan->b.ctcssRxEnable,pChan->b.ctcssTxEnable));
if(pChan->b.ctcssRxEnable)
{
pChan->rxHpfEnable=1;
pChan->spsRxLsdNrz->enabled=pChan->rxCenterSlicerEnable=1;
pChan->rxCtcssDecodeEnable=1;
pChan->rxCtcss->enabled=1;
}
else
{
pChan->rxHpfEnable=1;
pChan->spsRxLsdNrz->enabled=pChan->rxCenterSlicerEnable=0;
pChan->rxCtcssDecodeEnable=0;
pChan->rxCtcss->enabled=0;
}
TRACEF(1,("code_string_parse() CTCSS Init Decoders \n"));
for(i=0;i<CTCSS_NUM_CODES;i++)
{
t_tdet *ptdet;
ptdet=&(pChan->rxCtcss->tdet[i]);
ptdet->counterFactor=coef_ctcss_div[i];
ptdet->state=1;
ptdet->setpt=(M_Q15*0.041); // 0.069
ptdet->hyst =(M_Q15*0.0130);
ptdet->binFactor=(M_Q15*0.135); // was 0.140
ptdet->fudgeFactor=8;
}
// DEFAULT TX CODE
TRACEF(1,("code_string_parse() Default Tx Code %s \n",pChan->pTxCodeDefault));
pChan->txcodedefaultsmode=SMODE_NULL;
p=pChan->pStr=pChan->pTxCodeDefault;
#ifdef HAVE_XPMRX
if(!lsd_code_parse(pChan,3))
#endif
{
sscanf(p,"%f",&f);
ti=CtcssFreqIndex(f);
if(f>maxctcsstxfreq)maxctcsstxfreq=f;
if(ti>CTCSS_NULL)
{
pChan->b.ctcssTxEnable=1;
pChan->txctcssdefault_index=ti;
pChan->txctcssdefault_value=f;
pChan->spsSigGen0->freq=f*10;
pChan->txcodedefaultsmode=SMODE_CTCSS;
TRACEF(1,("code_string_parse() Tx Default CTCSS = %s %i %f\n",p,ti,f));
}
}
// set x for maximum length and just change pointers
TRACEF(1,("code_string_parse() Filter Config \n"));
pSps=pChan->spsTxLsdLpf;
if(pSps->x)free(pSps->x);
if(maxctcsstxfreq>203.5)
{
pSps->ncoef=taps_fir_lpf_250_9_66;
pSps->size_coef=2;
pSps->coef=(void*)coef_fir_lpf_250_9_66;
pSps->nx=taps_fir_lpf_250_9_66;
pSps->size_x=2;
pSps->x=(void*)(calloc(pSps->nx,pSps->size_x));
pSps->calcAdjust=gain_fir_lpf_250_9_66;
TRACEF(1,("code_string_parse() Tx Filter Freq High\n"));
}
else
{
pSps->ncoef=taps_fir_lpf_215_9_88;
pSps->size_coef=2;
pSps->coef=(void*)coef_fir_lpf_215_9_88;
pSps->nx=taps_fir_lpf_215_9_88;
pSps->size_x=2;
pSps->x=(void*)(calloc(pSps->nx,pSps->size_x));
pSps->calcAdjust=gain_fir_lpf_215_9_88;
TRACEF(1,("code_string_parse() Tx Filter Freq Low\n"));
}
// CTCSS Rx Decoder Low Pass Filter
hit=0;
ii= CtcssFreqIndex(203.5);
for(i=ii;i<CTCSS_NUM_CODES;i++)
{
if(pChan->rxCtcssMap[i]>CTCSS_NULL)hit=1;
}
pSps=pChan->spsRxLsd;
if(pSps->x)free(pSps->x);
if(hit)
{
pSps->ncoef=taps_fir_lpf_250_9_66;
pSps->size_coef=2;
pSps->coef=(void*)coef_fir_lpf_250_9_66;
pSps->nx=taps_fir_lpf_250_9_66;
pSps->size_x=2;
pSps->x=(void*)(calloc(pSps->nx,pSps->size_x));
pSps->calcAdjust=gain_fir_lpf_250_9_66;
TRACEF(1,("code_string_parse() Rx Filter Freq High\n"));
}
else
{
pSps->ncoef=taps_fir_lpf_215_9_88;
pSps->size_coef=2;
pSps->coef=(void*)coef_fir_lpf_215_9_88;
pSps->nx=taps_fir_lpf_215_9_88;
pSps->size_x=2;
pSps->x=(void*)(calloc(pSps->nx,pSps->size_x));
pSps->calcAdjust=gain_fir_lpf_215_9_88;
TRACEF(1,("code_string_parse() Rx Filter Freq Low\n"));
}
if(pChan->b.ctcssRxEnable || pChan->b.dcsRxEnable || pChan->b.lmrRxEnable)
{
pChan->rxCenterSlicerEnable=1;
pSps->enabled=1;
}
else
{
pChan->rxCenterSlicerEnable=0;
pSps->enabled=0;
}
#if XPMR_DEBUG0 == 1
TRACEF(2,("code_string_parse() ctcssRxEnable = %i \n",pChan->b.ctcssRxEnable));
TRACEF(2,(" ctcssTxEnable = %i \n",pChan->b.ctcssTxEnable));
TRACEF(2,(" dcsRxEnable = %i \n",pChan->b.dcsRxEnable));
TRACEF(2,(" lmrRxEnable = %i \n",pChan->b.lmrRxEnable));
TRACEF(2,(" txcodedefaultsmode = %i \n",pChan->txcodedefaultsmode));
for(i=0;i<CTCSS_NUM_CODES;i++)
{
TRACEF(2,("rxCtcssMap[%i] = %i \n",i,pChan->rxCtcssMap[i]));
}
#endif
#ifdef HAVE_XPMRX
lsd_code_parse(pChan,5);
#endif
TRACEF(1,("code_string_parse(%i) end\n",0));
return 0;
}
/*
Convert a Frequency in Hz to a zero based CTCSS Table index
*/
i16 CtcssFreqIndex(float freq)
{
i16 i,hit=CTCSS_NULL;
for(i=0;i<CTCSS_NUM_CODES;i++){
if(freq==freq_ctcss[i])hit=i;
}
return hit;
}
#ifndef HAVE_XPMRX_2
/*
pmr_rx_frontend
Takes a block of data and low pass filters it.
Determines the amplitude of high frequency noise for carrier detect.
Decimates input data to change the rate.
*/
i16 pmr_rx_frontend(t_pmr_sps *mySps)
{
#define DCgainBpfNoise 65536
i16 samples,nx,iOutput, *input, *output, *noutput;
i16 *x;
i16 decimator, decimate, doNoise, fever, fev1;
i32 i, naccum, outputGain, calcAdjust;
i64 y, npwr;
TRACEJ(5,("pmr_rx_frontend()\n"));
if(!mySps->enabled)return(1);
decimator = mySps->decimator;
decimate = mySps->decimate;
input = mySps->source;
output = mySps->sink;
noutput = mySps->parentChan->pRxNoise;
fever = mySps->parentChan->fever;
nx = mySps->nx;
calcAdjust = mySps->calcAdjust;
outputGain = mySps->outputGain;
samples=mySps->nSamples*decimate;
x=mySps->x;
iOutput=0;
npwr=0;
if(mySps->parentChan->rxCdType!=CD_XPMR_VOX)doNoise=1;
else doNoise=0;
if (fever)
fev1 = (nx - 1) * 2;
else
fev1 = nx - 1;
for(i=0;i<samples;i++)
{
i16 n;
//shift the old samples
#if 0
for(n=nx-1; n>0; n--)
x[n] = x[n-1];
#else
memmove(x+1,x,fev1);
#endif
x[0] = input[i*2];
#if XPMR_TRACE_FRONTEND == 1
y=0;
for(n=0; n<nx; n++)
y += fir_rxlpf[mySps->parentChan->rxlpf].coefs[n] * x[n];
y=((y/calcAdjust)*outputGain)/M_Q8;
input[i*2]=y; // debug output LowPass at 48KS/s
#endif
if(doNoise)
{
// calculate noise filter output
naccum=0;
if(mySps->parentChan->rxNoiseFilType==0)
{
for(n=0; n<taps_fir_bpf_noise_1; n++)
naccum += coef_fir_bpf_noise_1[n] * x[n];
naccum /= DCgainBpfNoise;
}
else
{
for(n=0; n<taps_fir_bpf_noise_2; n++)
naccum += coef_fir_bpf_noise_2[n] * x[n];
naccum /= gain_fir_bpf_noise_2;
}
#if XPMR_TRACE_FRONTEND == 1
input[i*2+1]=naccum; // output noise filter results
#endif
npwr+=naccum*naccum;
}
--decimator;
if(decimator<=0)
{
decimator=decimate;
y=0;
for(n=0; n<nx; n++)
y += fir_rxlpf[mySps->parentChan->rxlpf].coefs[n] * x[n];
y=((y/calcAdjust)*outputGain)/M_Q8;
#if XPMR_TRACE_OVFLW == 1
if(y>32767)
{
y=32767;
printf("pmr_rx_frontend() OVRFLW \n" );
}
else if(y<-32767)
{
y=-32767;
printf("pmr_rx_frontend() UNDFLW \n" );
}
#else
if(y>32767)y=32767;
else if(y<-32767)y=-32767;
#endif
output[iOutput++]=y; // Rx Baseband decimated
} // if decimator
}
if(doNoise)
{
npwr=sqrt(npwr)/16;
// compOut=Squelched
if(mySps->blanking)mySps->blanking--;
mySps->blanking=0;
if( !mySps->compOut &&
( (npwr>(mySps->setpt+mySps->hyst)) ||
( (mySps->apeak<(mySps->setpt/4)) && (npwr>mySps->setpt) )
)
)
{
if(!mySps->compOut)
{
mySps->blanking=2;
mySps->compOut=1;
}
}
else if ((npwr<mySps->setpt)&&(!mySps->blanking))
{
mySps->compOut=0;
}
#if XPMR_DEBUG0 == 1
if(mySps->parentChan->tracetype)
{
for(i=0;i<mySps->nSamples;i++)
{
noutput[i] = npwr;
}
}
#endif
((t_pmr_chan *)(mySps->parentChan))->rxRssi=mySps->apeak=npwr;
}
return 0;
}
#endif
/*
pmr general purpose fir
works on a block of samples
*/
i16 pmr_gp_fir(t_pmr_sps *mySps)
{
i32 nsamples,inputGain,outputGain,calcAdjust;
i16 *input, *output;
i16 *x, *coef;
i32 i, ii;
i16 nx, hyst, setpt, compOut;
i16 amax, amin, apeak=0, discounteru=0, discounterl=0, discfactor;
i16 decimator, decimate, interpolate;
i16 numChanOut, selChanOut, mixOut, monoOut;
TRACEJ(5,("pmr_gp_fir() %i %i\n",mySps->index, mySps->enabled));
if(!mySps->enabled)return(1);
inputGain = mySps->inputGain;
calcAdjust = mySps->calcAdjust;
outputGain = mySps->outputGain;
input = mySps->source;
output = mySps->sink;
x = mySps->x;
nx = mySps->nx;
coef = mySps->coef;
decimator = mySps->decimator;
decimate = mySps->decimate;
interpolate = mySps->interpolate;
setpt = mySps->setpt;
compOut = mySps->compOut;
inputGain = mySps->inputGain;
outputGain = mySps->outputGain;
numChanOut = mySps->numChanOut;
selChanOut = mySps->selChanOut;
mixOut = mySps->mixOut;
monoOut = mySps->monoOut;
amax=mySps->amax;
amin=mySps->amin;
discfactor=mySps->discfactor;
hyst=mySps->hyst;
setpt=mySps->setpt;
nsamples=mySps->nSamples;
if(mySps->option==3)
{
mySps->option=0;
mySps->enabled=0;
for(i=0;i<nsamples;i++)
{
if(monoOut)
output[(i*2)]=output[(i*2)+1]=0;
else
output[(i*numChanOut)+selChanOut]=0;
}
return 0;
}
ii=0;
for(i=0;i<nsamples;i++)
{
int ix;
int64_t y=0;
if(decimate<0)
{
decimator=decimate;
}
for(ix=0;ix<interpolate;ix++)
{
i16 n;
y=0;
for(n=nx-1; n>0; n--)
x[n] = x[n-1];
x[0] = (input[i]*inputGain)/M_Q8;
#if 0
--decimator;
if(decimator<=0)
{
decimator=decimate;
for(n=0; n<nx; n++)
y += coef[n] * x[n];
y /= (outputGain*3);
output[ii++]=y;
}
#else
for(n=0; n<nx; n++)
y += coef[n] * x[n];
y=((y/calcAdjust)*outputGain)/M_Q8;
if (y>32767)y=32767; // overflow
else if(y<-32767)y=-32767;
if(mixOut){
if(monoOut){
output[(ii*2)]=output[(ii*2)+1]+=y;
}
else{
output[(ii*numChanOut)+selChanOut]+=y;
}
}
else{
if(monoOut){
output[(ii*2)]=output[(ii*2)+1]=y;
}
else{
output[(ii*numChanOut)+selChanOut]=y;
}
}
ii++;
#endif
}
// amplitude detector
if(setpt)
{
i16 accum=y;
if(accum>amax)
{
amax=accum;
discounteru=discfactor;
}
else if(--discounteru<=0)
{
discounteru=discfactor;
amax=(i32)((amax*32700)/32768);
}
if(accum<amin)
{
amin=accum;
discounterl=discfactor;
}
else if(--discounterl<=0)
{
discounterl=discfactor;
amin=(i32)((amin*32700)/32768);
}
apeak = (i32)(amax-amin)/2;
if(apeak>setpt)compOut=1;
else if(compOut&&(apeak<(setpt-hyst)))compOut=0;
}
}
mySps->decimator = decimator;
mySps->amax=amax;
mySps->amin=amin;
mySps->apeak=apeak;
mySps->discounteru=discounteru;
mySps->discounterl=discounterl;
mySps->compOut=compOut;
return 0;
}
/*
general purpose integrator lpf
*/
i16 gp_inte_00(t_pmr_sps *mySps)
{
i16 npoints;
i16 *input, *output;
i32 outputGain;
i32 i;
i32 accum;
i32 state00;
i16 coeff00, coeff01;
TRACEJ(5,("gp_inte_00() %i\n",mySps->enabled));
if(!mySps->enabled)return(1);
input = mySps->source;
output = mySps->sink;
npoints=mySps->nSamples;
outputGain=mySps->outputGain;
coeff00=((i16*)mySps->coef)[0];
coeff01=((i16*)mySps->coef)[1];
state00=((i32*)mySps->x)[0];
// note fixed gain of 2 to compensate for attenuation
// in passband
for(i=0;i<npoints;i++)
{
accum=input[i];
state00 = accum + (state00*coeff01)/M_Q15;
accum = (state00*coeff00)/(M_Q15/4);
output[i]=(accum*outputGain)/M_Q8;
}
((i32*)(mySps->x))[0]=state00;
return 0;
}
/*
general purpose differentiator hpf
*/
i16 gp_diff(t_pmr_sps *mySps)
{
i16 *input, *output;
i16 npoints;
i32 outputGain, calcAdjust;
i32 i;
i32 temp0,temp1;
i16 x0;
i32 y0;
i16 a0,a1;
i16 *coef;
i16 *x;
input = mySps->source;
output = mySps->sink;
npoints=mySps->nSamples;
outputGain=mySps->outputGain;
calcAdjust=mySps->calcAdjust;
coef=(i16*)(mySps->coef);
x=(i16*)(mySps->x);
a0=coef[0];
a1=coef[1];
x0=x[0];
TRACEJ(5,("gp_diff()\n"));
for (i=0;i<npoints;i++)
{
temp0 = x0 * a1;
x0 = input[i];
temp1 = input[i] * a0;
y0 = (temp0 + temp1)/calcAdjust;
y0 =(y0*outputGain)/M_Q8;
if(y0>32767)y0=32767;
else if(y0<-32767)y0=-32767;
output[i]=y0;
}
x[0]=x0;
return 0;
}
/* ----------------------------------------------------------------------
CenterSlicer
*/
i16 CenterSlicer(t_pmr_sps *mySps)
{
i16 npoints;
i16 *input, *output, *buff;
i32 inputGainB;
i32 i;
i32 accum;
i32 amax; // buffer amplitude maximum
i32 amin; // buffer amplitude minimum
i32 apeak; // buffer amplitude peak
i32 center;
i32 setpt; // amplitude set point for peak tracking
i32 discounteru; // amplitude detector integrator discharge counter upper
i32 discounterl; // amplitude detector integrator discharge counter lower
i32 discfactor; // amplitude detector integrator discharge factor
TRACEJ(5,("CenterSlicer() %i\n",mySps->enabled));
if(!mySps->enabled)return(1);
input = mySps->source;
output = mySps->sink; // limited output
buff = mySps->buff;
npoints=mySps->nSamples;
inputGainB=mySps->inputGainB;
amax=mySps->amax;
amin=mySps->amin;
setpt=mySps->setpt;
apeak=mySps->apeak;
discounteru=mySps->discounteru;
discounterl=mySps->discounterl;
discfactor=mySps->discfactor;
npoints=mySps->nSamples;
for(i=0;i<npoints;i++)
{
accum=input[i];
if(accum>amax)
{
amax=accum;
if(amin<(amax-setpt))
{
amin=(amax-setpt);
}
}
else if(accum<amin)
{
amin=accum;
if(amax>(amin+setpt))
{
amax=(amin+setpt);
}
}
#if 0
if((discounteru-=1)<=0 && amax>amin)
{
if((amax-=10)<amin)amax=amin;
}
if((discounterl-=1)<=0 && amin<amax)
{
if((amin+=10)>amax)amin=amax;
lhit=1;
}
if(uhit)discounteru=discfactor;
if(lhit)discounterl=discfactor;
#else
if((amax-=discfactor)<amin)amax=amin;
if((amin+=discfactor)>amax)amin=amax;
#endif
apeak = (amax-amin)/2;
center = (amax+amin)/2;
accum = accum - center;
output[i]=accum; // sink output unlimited/centered.