librpitx/src/fskburst.cpp

/*
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"
#include "util.h"
#include <unistd.h>

fskburst::fskburst(uint64_t TuneFrequency, float SymbolRate, float Deviation, int Channel, uint32_t FifoSize, size_t upsample,float RatioRamp) : bufferdma(Channel, FifoSize * upsample + 3, 2, 1), freqdeviation(Deviation), SR_upsample(upsample)
{

	clkgpio::SetAdvancedPllMode(true);
	clkgpio::SetCenterFrequency(TuneFrequency, Deviation*10); // Write Mult Int and Frac : FixMe carrier is already there
	clkgpio::SetFrequency(0);
	disableclk(4);
	syncwithpwm = false;
	Ramp = SR_upsample * RatioRamp; //Ramp time = 10%

	if (syncwithpwm)
	{
		pwmgpio::SetPllNumber(clk_plld, 1);
		pwmgpio::SetFrequency(SymbolRate * (float)SR_upsample);
	}
	else
	{
		pcmgpio::SetPllNumber(clk_plld, 1);
		pcmgpio::SetFrequency(SymbolRate * (float)SR_upsample);
	}

	//Should be obligatory place before setdmaalgo
	Originfsel = clkgpio::gengpio.gpioreg[GPFSEL0];
	dbg_printf(1, "FSK Origin fsel %x\n", Originfsel);

	SetDmaAlgo();
}

fskburst::~fskburst()
{
}

void fskburst::SetDmaAlgo()
{

	sampletab[buffersize * registerbysample - 2] = (Originfsel & ~(7 << 12)) | (4 << 12); //Gpio  Clk
	sampletab[buffersize * registerbysample - 1] = (Originfsel & ~(7 << 12)) | (0 << 12); //Gpio  In

	dma_cb_t *cbp = cbarray;
	// We must fill the FIFO (PWM or PCM) to be Synchronized from start
	// PWM FIFO = 16
	// PCM FIFO = 64
	if (syncwithpwm)
	{
		SetEasyCB(cbp++, 0, dma_pwm, 16 + 1);
	}
	else
	{
		SetEasyCB(cbp++, 0, dma_pcm, 64 + 1);
	}

	SetEasyCB(cbp++, buffersize * registerbysample - 2, dma_fsel, 1); //Enable clk

	for (uint32_t samplecnt = 0; samplecnt < buffersize - 2; samplecnt++)
	{

		// Write a frequency sample
		SetEasyCB(cbp++, samplecnt * registerbysample, dma_pllc_frac, 1); //FReq

		// Delay
		SetEasyCB(cbp++, samplecnt * registerbysample, syncwithpwm ? dma_pwm : dma_pcm, 1);
	}
	lastcbp = cbp;

	SetEasyCB(cbp, buffersize * registerbysample - 1, dma_fsel, 1); //Disable clk

	cbp->next = 0; // Stop DMA

	dbg_printf(2, "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 - 3)
	{
		dbg_printf(1, "Buffer overflow\n");
		return;
	}

	dma_cb_t *cbp = cbarray;
	cbp += 2; // Skip the first 2 CB (initialisation)

	

	for (unsigned int i = 0; i < Size; i++)
	{
		for (size_t j = 0; j < SR_upsample - Ramp; j++)
		{
			sampletab[i * SR_upsample + j] = (0x5A << 24) | GetMasterFrac(freqdeviation * Symbols[i]);
			cbp++; //SKIP FREQ CB
			cbp->next = mem_virt_to_phys(cbp + 1);
			cbp++;
		}
		for (size_t j = 0 ; j < Ramp; j++)
		{
			if (i < Size - 1)
			{
				sampletab[i * SR_upsample + j + SR_upsample - Ramp] = (0x5A << 24) | GetMasterFrac(freqdeviation * Symbols[i] + j* (freqdeviation * Symbols[i + 1] - freqdeviation * Symbols[i]) / (float)Ramp);
				dbg_printf(2, "Ramp %f ->%f : %d %f\n",freqdeviation * Symbols[i],freqdeviation * Symbols[i+1], j,freqdeviation * Symbols[i] + j* (freqdeviation * Symbols[i + 1] - freqdeviation * Symbols[i]) / (float)Ramp);							
			}
			else
			{
				sampletab[i * SR_upsample + j + SR_upsample -Ramp] = (0x5A << 24) | GetMasterFrac(freqdeviation * Symbols[i]);
			}
			
			cbp++; //SKIP FREQ CB
			cbp->next = mem_virt_to_phys(cbp + 1);
			cbp++;
		}
	}
	cbp--;
	cbp->next = mem_virt_to_phys(lastcbp);

	dma::start();
	while (isrunning()) //Block function : return until sent completely signal
	{
		//dbg_printf(1,"GPIO %x\n",clkgpio::gengpio.gpioreg[GPFSEL0]);
		usleep(100);
	}
	dbg_printf(1, "FSK burst end Tx\n", cbp->src, cbp->dst, cbp->next);
	usleep(100); //To be sure last symbol Tx ?
}