librpitx/src/fskburst.cpp

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/*
Copyright (C) 2018 Evariste COURJAUD F5OEO
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "stdio.h"
#include "fskburst.h"
fskburst::fskburst(uint64_t TuneFrequency,uint32_t SymbolRate,uint32_t Deviation,int Channel,uint32_t FifoSize):bufferdma(Channel,FifoSize+2,2,1),freqdeviation(Deviation)
{
clkgpio::SetAdvancedPllMode(true);
clkgpio::SetCenterFrequency(TuneFrequency,SymbolRate); // Write Mult Int and Frac : FixMe carrier is already there
clkgpio::SetFrequency(0);
//clkgpio::enableclk(4); // GPIO 4 CLK by default
syncwithpwm=false;
if(syncwithpwm)
{
pwmgpio::SetPllNumber(clk_plld,1);
pwmgpio::SetFrequency(SymbolRate);
}
else
{
pcmgpio::SetPllNumber(clk_plld,1);
pcmgpio::SetFrequency(SymbolRate);
}
SetDmaAlgo();
padgpio pad;
Originfsel=pad.gpioreg[PADS_GPIO_0];
}
fskburst::~fskburst()
{
}
void fskburst::SetDmaAlgo()
{
sampletab[buffersize*registerbysample-2]=(Originfsel & ~(7 << 12)) | (4 << 12); //Enable Clk
sampletab[buffersize*registerbysample-1]=(Originfsel & ~(7 << 12)) | (0 << 12); //Disable Clk
dma_cb_t *cbp = cbarray;
cbp->info = BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP ;
cbp->src = mem_virt_to_phys(&usermem[buffersize*registerbysample-2]);
cbp->dst = 0x7E000000 + (GPFSEL0<<2)+GENERAL_BASE;
cbp->length = 4;
cbp->stride = 0;
cbp->next = mem_virt_to_phys(cbp + 1); // Stop DMA
cbp++;
for (uint32_t samplecnt = 0; samplecnt < buffersize-2; samplecnt++)
{
// Write a frequency sample
cbp->info = BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP ;
cbp->src = mem_virt_to_phys(&usermem[samplecnt*registerbysample]);
cbp->dst = 0x7E000000 + (PLLA_FRAC<<2) + CLK_BASE ;
cbp->length = 4;
cbp->stride = 0;
cbp->next = mem_virt_to_phys(cbp + 1);
//fprintf(stderr,"cbp : sample %x src %x dest %x next %x\n",samplecnt,cbp->src,cbp->dst,cbp->next);
cbp++;
// Delay
if(syncwithpwm)
cbp->info = BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP |BCM2708_DMA_D_DREQ | BCM2708_DMA_PER_MAP(DREQ_PWM);
else
cbp->info = BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP |BCM2708_DMA_D_DREQ | BCM2708_DMA_PER_MAP(DREQ_PCM_TX);
cbp->src = mem_virt_to_phys(cbarray); // Data is not important as we use it only to feed the PWM
if(syncwithpwm)
cbp->dst = 0x7E000000 + (PWM_FIFO<<2) + PWM_BASE ;
else
cbp->dst = 0x7E000000 + (PCM_FIFO_A<<2) + PCM_BASE ;
cbp->length = 4;
cbp->stride = 0;
cbp->next = mem_virt_to_phys(cbp + 1);
//fprintf(stderr,"cbp : sample %x src %x dest %x next %x\n",samplecnt,cbp->src,cbp->dst,cbp->next);
cbp++;
}
lastcbp=cbp;
cbp->info = BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP ;
cbp->src = mem_virt_to_phys(&usermem[(buffersize*registerbysample-1)]);
cbp->dst = 0x7E000000 + (GPFSEL0<<2)+GENERAL_BASE;
cbp->length = 4;
cbp->stride = 0;
cbp->next = 0; // Stop DMA
//fprintf(stderr,"Last cbp : src %x dest %x next %x\n",cbp->src,cbp->dst,cbp->next);
}
void fskburst::SetSymbols(unsigned char *Symbols,uint32_t Size)
{
if(Size>buffersize-2) {fprintf(stderr,"Buffer overflow\n");return;}
dma_cb_t *cbp=cbarray+1+1;
for(unsigned int i=0;i<Size;i++)
{
sampletab[i]=(0x5A<<24)|GetMasterFrac((Symbols[i]==0)?-freqdeviation:freqdeviation);
cbp = &cbarray[i*cbbysample+1+1];
cbp->next = mem_virt_to_phys(cbp + 1);
}
cbp->next = mem_virt_to_phys(lastcbp);
dma::start();
}