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Reduce Max PLL frequency to 1.4ghz

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This commit is contained in:
F5OEO 2019-01-04 10:55:04 +00:00
parent 1a1f4999ff
commit d23e1fd8fc
2 changed files with 4 additions and 2 deletions
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4
src/dma.cpp
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@ -126,6 +126,7 @@ int dma::start()
dma_reg.gpioreg[DMA_DEBUG+channel*0x40] = 7; // clear debug error flags dma_reg.gpioreg[DMA_DEBUG+channel*0x40] = 7; // clear debug error flags
usleep(100); usleep(100);
dma_reg.gpioreg[DMA_CS+channel*0x40] = DMA_CS_PRIORITY(7) | DMA_CS_PANIC_PRIORITY(7) | DMA_CS_DISDEBUG |DMA_CS_ACTIVE; dma_reg.gpioreg[DMA_CS+channel*0x40] = DMA_CS_PRIORITY(7) | DMA_CS_PANIC_PRIORITY(7) | DMA_CS_DISDEBUG |DMA_CS_ACTIVE;
Started=true;
return 0; return 0;
} }
@ -139,6 +140,7 @@ int dma::stop()
usleep(100); usleep(100);
dma_reg.gpioreg[DMA_DEBUG+channel*0x40] = 7; // clear debug error flags dma_reg.gpioreg[DMA_DEBUG+channel*0x40] = 7; // clear debug error flags
usleep(100); usleep(100);
Started=false;
return 0; return 0;
} }
@ -260,7 +262,7 @@ int bufferdma::PushSample(int Index)
if(last_sample>buffersize/4) if(last_sample>buffersize/4)
{ {
start(); // 1/4 Fill buffer before starting DMA start(); // 1/4 Fill buffer before starting DMA
Started=true;
} }

2
src/gpio.cpp
View file

@ -207,7 +207,7 @@ int clkgpio::ComputeBestLO(uint64_t Frequency, int Bandwidth)
// Constants taken https://github.com/raspberrypi/linux/blob/ffd7bf4085b09447e5db96edd74e524f118ca3fe/drivers/clk/bcm/clk-bcm2835.c#L1763 // Constants taken https://github.com/raspberrypi/linux/blob/ffd7bf4085b09447e5db96edd74e524f118ca3fe/drivers/clk/bcm/clk-bcm2835.c#L1763
//MIN RATE is NORMALLY 600MHZ //MIN RATE is NORMALLY 600MHZ
#define MIN_PLL_RATE 200e6 #define MIN_PLL_RATE 200e6
#define MIN_PLL_RATE_USE_PDIV 1700e6 #define MIN_PLL_RATE_USE_PDIV 1500e6 //1700 works but some ticky breaks in clock..PLL should be at limit
#define MAX_PLL_RATE 4e9 #define MAX_PLL_RATE 4e9
#define XTAL_RATE 19.2e6 #define XTAL_RATE 19.2e6
double xtal_freq_recip = 1.0 / XTAL_RATE; // todo PPM correction double xtal_freq_recip = 1.0 / XTAL_RATE; // todo PPM correction