78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
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/*
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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 "fmdmasync.h"
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#include "gpio.h" //for definition of registers
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fmdmasync::fmdmasync(int Channel,uint32_t FifoSize):dma(Channel,FifoSize*2,FifoSize)
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{
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SetDmaAlgo();
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FillMemory(12,1472);
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}
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fmdmasync::~fmdmasync()
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{
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}
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void fmdmasync::SetDmaAlgo()
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{
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dma_cb_t *cbp = cbarray;
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for (uint32_t samplecnt = 0; samplecnt < cbsize/2; samplecnt++) { //cbsize/2 because we have 2 CB by sample
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// Write a frequency sample
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cbp->info = BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP ;
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cbp->src = mem_virt_to_phys(&usermem[samplecnt]);
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cbp->dst = 0x7E000000 + (GPCLK_DIV<<2) + CLK_BASE ;
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cbp->length = 4;
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cbp->stride = 0;
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cbp->next = mem_virt_to_phys(cbp + 1);
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//fprintf(stderr,"cbp : sample %x src %x dest %x next %x\n",samplecnt,cbp->src,cbp->dst,cbp->next);
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cbp++;
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// Delay
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cbp->info = /*BCM2708_DMA_SRC_IGNOR | */BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP | BCM2708_DMA_D_DREQ | BCM2708_DMA_PER_MAP(DREQ_PWM);
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cbp->src = mem_virt_to_phys(cbarray); // Data is not important as we use it only to feed the PWM
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cbp->dst = 0x7E000000 + (PWM_FIFO<<2) + PWM_BASE ;
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cbp->length = 4;
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cbp->stride = 0;
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cbp->next = mem_virt_to_phys(cbp + 1);
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//fprintf(stderr,"cbp : sample %x src %x dest %x next %x\n",samplecnt,cbp->src,cbp->dst,cbp->next);
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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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//fprintf(stderr,"Last cbp : src %x dest %x next %x\n",cbp->src,cbp->dst,cbp->next);
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}
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void fmdmasync::FillMemory(uint32_t FreqDivider,uint32_t FreqFractionnal)
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{
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for (uint32_t samplecnt = 0; samplecnt < usermemsize; samplecnt++)
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{
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usermem[samplecnt]=0x5A000000 | ((FreqDivider)<<12) | FreqFractionnal;
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FreqFractionnal=(FreqFractionnal+1)%4096;
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if (FreqFractionnal==0) FreqDivider++;
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}
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}
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