kopia lustrzana https://github.com/F5OEO/librpitx
121 wiersze
3.1 KiB
C++
121 wiersze
3.1 KiB
C++
/*
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Copyright (C) 2018 Evariste COURJAUD F5OEO
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "stdio.h"
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#include "fskburst.h"
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#include <unistd.h>
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fskburst::fskburst(uint64_t TuneFrequency,uint32_t SymbolRate,float Deviation,int Channel,uint32_t FifoSize):bufferdma(Channel,FifoSize+3,2,1),freqdeviation(Deviation)
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{
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clkgpio::SetAdvancedPllMode(true);
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clkgpio::SetCenterFrequency(TuneFrequency,SymbolRate); // Write Mult Int and Frac : FixMe carrier is already there
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clkgpio::SetFrequency(0);
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syncwithpwm=false;
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if(syncwithpwm)
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{
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pwmgpio::SetPllNumber(clk_plld,1);
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pwmgpio::SetFrequency(SymbolRate);
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}
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else
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{
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pcmgpio::SetPllNumber(clk_plld,1);
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pcmgpio::SetFrequency(SymbolRate);
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}
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SetDmaAlgo();
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padgpio pad;
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Originfsel=pad.gpioreg[PADS_GPIO_0];
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}
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fskburst::~fskburst()
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{
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}
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void fskburst::SetDmaAlgo()
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{
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sampletab[buffersize*registerbysample-2]=(Originfsel & ~(7 << 12)) | (4 << 12); //Enable Clk
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sampletab[buffersize*registerbysample-1]=(Originfsel & ~(7 << 12)) | (0 << 12); //Disable Clk
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dma_cb_t *cbp = cbarray;
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// We must fill the FIFO (PWM or PCM) to be Synchronized from start
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// PWM FIFO = 16
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// PCM FIFO = 64
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if(syncwithpwm)
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{
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SetEasyCB(cbp++,0,dma_pwm,16+1);
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}
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else
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{
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SetEasyCB(cbp++,0,dma_pcm,64+1);
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}
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SetEasyCB(cbp++,buffersize*registerbysample-2,dma_fsel,1);//Enable clk
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for (uint32_t samplecnt = 0; samplecnt < buffersize-2; samplecnt++)
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{
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// Write a frequency sample
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SetEasyCB(cbp++,samplecnt*registerbysample,dma_pllc_frac,1);//Enable clk
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// Delay
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SetEasyCB(cbp++,samplecnt*registerbysample,syncwithpwm?dma_pwm:dma_pcm,1);
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}
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lastcbp=cbp;
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SetEasyCB(cbp,buffersize*registerbysample-1,dma_fsel,1);//Disable clk
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cbp->next = 0; // Stop DMA
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//dbg_printf(1,"Last cbp : src %x dest %x next %x\n",cbp->src,cbp->dst,cbp->next);
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}
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void fskburst::SetSymbols(unsigned char *Symbols,uint32_t Size)
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{
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if(Size>buffersize-3) {dbg_printf(1,"Buffer overflow\n");return;}
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dma_cb_t *cbp=cbarray;
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cbp+=2; // Skip the first 2 CB (initialisation)
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for(unsigned int i=0;i<Size;i++)
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{
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sampletab[i]=(0x5A<<24)|GetMasterFrac((Symbols[i]==0)?-freqdeviation:freqdeviation);
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cbp++;//SKIP FREQ CB
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cbp->next = mem_virt_to_phys(cbp + 1);
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cbp++;
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}
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cbp--;
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cbp->next = mem_virt_to_phys(lastcbp);
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dma::start();
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while(isrunning()) //Block function : return until sent completely signal
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{
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usleep(100);
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}
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usleep(100);//To be sure last symbol Tx ?
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}
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