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AM added, searching for 50Hz issue

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F5OEO
2018-03-14 21:57:44 +00:00
parent 40f2f7e3dd
commit eec4c85cf0
7 changed files with 287 additions and 15 deletions
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123
src/amdmasync.cpp Normal file
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#include "stdio.h"
#include "amdmasync.h"
#include <math.h>
amdmasync::amdmasync(uint64_t TuneFrequency,uint32_t SampleRate,int Channel,uint32_t FifoSize):bufferdma(Channel,FifoSize,3,2)
{
tunefreq=TuneFrequency;
clkgpio::SetAdvancedPllMode(true);
clkgpio::SetCenterFrequency(TuneFrequency,SampleRate);
clkgpio::SetFrequency(0);
clkgpio::enableclk(4); // GPIO 4 CLK by default
syncwithpwm=false;
if(syncwithpwm)
{
pwmgpio::SetPllNumber(clk_plld,1);
pwmgpio::SetFrequency(SampleRate);
}
else
{
pcmgpio::SetPllNumber(clk_plld,1);
pcmgpio::SetFrequency(SampleRate);
}
padgpio pad;
Originfsel=pad.gpioreg[PADS_GPIO_0];
SetDmaAlgo();
}
amdmasync::~amdmasync()
{
clkgpio::disableclk(4);
padgpio pad;
pad.gpioreg[PADS_GPIO_0]=Originfsel;
}
void amdmasync::SetDmaAlgo()
{
dma_cb_t *cbp = cbarray;
for (uint32_t samplecnt = 0; samplecnt < buffersize; samplecnt++)
{
//@0
//Set Amplitude by writing to PADS
cbp->info = 0;//BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP ;
cbp->src = mem_virt_to_phys(&usermem[samplecnt*registerbysample]);
cbp->dst = 0x7E000000+(PADS_GPIO_0<<2)+PADS_GPIO;
cbp->length = 4;
cbp->stride = 0;
cbp->next = mem_virt_to_phys(cbp + 1);
cbp++;
//@1
//Set Amplitude to FSEL for amplitude=0
cbp->info = 0;//BCM2708_DMA_NO_WIDE_BURSTS | BCM2708_DMA_WAIT_RESP ;
cbp->src = mem_virt_to_phys(&usermem[samplecnt*registerbysample+1]);
cbp->dst = 0x7E000000 + (GPFSEL0<<2)+GENERAL_BASE;
cbp->length = 4;
cbp->stride = 0;
cbp->next = mem_virt_to_phys(cbp + 1);
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++;
}
cbp--;
cbp->next = mem_virt_to_phys(cbarray); // We loop to the first CB
//fprintf(stderr,"Last cbp : src %x dest %x next %x\n",cbp->src,cbp->dst,cbp->next);
}
void amdmasync::SetAmSample(uint32_t Index,float Amplitude) //-1;1
{
Index=Index%buffersize;
int IntAmplitude=round(abs(Amplitude)*8.0)-1;
int IntAmplitudePAD=IntAmplitude;
if(IntAmplitudePAD>7) IntAmplitudePAD=7;
if(IntAmplitudePAD<0) IntAmplitudePAD=0;
//fprintf(stderr,"Amplitude=%f PAD %d\n",Amplitude,IntAmplitudePAD);
sampletab[Index*registerbysample]=(0x5A<<24) + (IntAmplitudePAD&0x7) + (1<<4) + (0<<3); // Amplitude PAD
//sampletab[Index*registerbysample+2]=(Originfsel & ~(7 << 12)) | (4 << 12); //Alternate is CLK
if(IntAmplitude==-1)
{
sampletab[Index*registerbysample+1]=(Originfsel & ~(7 << 12)) | (0 << 12); //Pin is in -> Amplitude 0
}
else
{
sampletab[Index*registerbysample+1]=(Originfsel & ~(7 << 12)) | (4 << 12); //Alternate is CLK
}
PushSample(Index);
}