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Remove prediv*2, set loadper=1 and allow 1 divider to extent frequency range

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This commit is contained in:
F5OEO 2018-04-30 11:57:03 +00:00
parent e608ff8936
commit 9e757ea566
3 changed files with 429 additions and 416 deletions
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834
src/gpio.cpp
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File diff suppressed because it is too large Load diff

5
src/phasedmasync.cpp
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@ -44,9 +44,10 @@ phasedmasync::phasedmasync(uint64_t TuneFrequency,uint32_t SampleRate,int Number
fprintf(stderr,"PWM Mult %d Frac %d Div %d\n",IntMultiply,FracMultiply,clkgpio::PllFixDivider);
pwmgpio::clk.gpioreg[PWMCLK_DIV] = 0x5A000000 | ((clkgpio::PllFixDivider)<<12); // PWM clock input divider
pwmgpio::clk.gpioreg[PWMCLK_DIV] = 0x5A000000 | ((clkgpio::PllFixDivider)<<12) |pwmgpio::pllnumber; // PWM clock input divider
usleep(100);
pwmgpio::clk.gpioreg[PWMCLK_CNTL]= 0x5A000000 | (pwmgpio::Mash << 9) | pwmgpio::pllnumber|(1 << 4) ; //4 is START CLK
pwmgpio::clk.gpioreg[PWMCLK_CNTL]= 0x5A000000 | (pwmgpio::Mash << 9) | ((clkgpio::PllFixDivider)<<12)| pwmgpio::pllnumber|(1 << 4) ; //4 is START CLK
usleep(100);
pwmgpio::SetPrediv(32); //SetMode should be called before

6
src/serialdmasync.cpp
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@ -48,11 +48,7 @@ serialdmasync::serialdmasync(uint32_t SampleRate,int Channel,uint32_t FifoSize,b
SetDmaAlgo();
// Note : Spurious are at +/-(19.2MHZ/2^20)*Div*N : (N=1,2,3...) So we need to have a big div to spurious away BUT
// Spurious are ALSO at +/-(19.2MHZ/2^20)*(2^20-Div)*N
// Max spurious avoid is to be in the center ! Theory shoud be that spurious are set away at 19.2/2= 9.6Mhz ! But need to get account of div of PLLClock
}
serialdmasync::~serialdmasync()