kopia lustrzana https://github.com/F5OEO/librpitx
84 wiersze
1.9 KiB
C++
84 wiersze
1.9 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 "serialdmasync.h"
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serialdmasync::serialdmasync(uint32_t SampleRate,int Channel,uint32_t FifoSize,bool dualoutput):bufferdma(Channel,FifoSize,1,1)
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{
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if(dualoutput) //Fixme if 2pin we want maybe 2*SRATE as it is distributed over 2 pin
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{
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pwmgpio::SetMode(pwm2pin);
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SampleRate*=2;
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}
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else
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{
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pwmgpio::SetMode(pwm1pin);
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}
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if(SampleRate>250000)
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{
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pwmgpio::SetPllNumber(clk_plld,1);
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pwmgpio::SetFrequency(SampleRate);
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}
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else
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{
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pwmgpio::SetPllNumber(clk_osc,1);
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pwmgpio::SetFrequency(SampleRate);
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}
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enablepwm(12,0); // By default PWM on GPIO 12/pin 32
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enablepwm(13,0); // By default PWM on GPIO 13/pin 33
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SetDmaAlgo();
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}
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serialdmasync::~serialdmasync()
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{
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}
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void serialdmasync::SetDmaAlgo()
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{
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dma_cb_t *cbp = cbarray;
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for (uint32_t samplecnt = 0; samplecnt < buffersize; samplecnt++)
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{
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SetEasyCB(cbp,samplecnt*registerbysample,dma_pwm,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(cbarray); // We loop to the first CB
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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 serialdmasync::SetSample(uint32_t Index,int Sample)
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{
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Index=Index%buffersize;
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sampletab[Index]=Sample;
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PushSample(Index);
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}
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