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Some output, wrong frequency

This commit is contained in:
Sebastian 2018-06-20 01:22:31 +02:00
parent 546a9c7fde
commit f0f8d4f1d8
5 changed files with 146 additions and 13 deletions
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4
firmware/Makefile
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@ -4,8 +4,8 @@ ISPPORT ?= /dev/kaboard
VERSION = 0.1
HEADERS = include/twi.h
SRC = main.c twi.c
HEADERS = include/twi.h include/si5351.h
SRC = main.c twi.c si5351.c
TARGET = cube-kl
OBJDIR = bin

31
firmware/include/si5351.h
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@ -5,16 +5,37 @@
#include "twi.h"
const uint8_t SI5351_ADDRESS = 96;
static const uint8_t SI5351_ADDRESS = 96;
enum si5351_param_base {
PLL_A = 26,
PLL_B = 34,
MULTISYNTH_0 = 42,
MULTOSYNTH_1 = 50,
MULTISYNTH_2 = 58
};
enum si5351_reg {
CLK_ENABLE_CONTROL = 3,
PLLX_SRC = 15,
CLK0_CONTROL = 16,
CLK1_CONTROL = 17,
CLK2_CONTROL = 18,
PLL_RESET = 177,
XTAL_LOAD_CAP = 183
};
static inline uint8_t si5351_write8(uint8_t reg, uint8_t value) {
uint8_t data[3] = {reg, value};
return twi_write(SI5351_ADDRESS, data, 2);
}
static inline uint8_t si5351_write16(uint8_t reg, uint16_t value) {
uint8_t data[3] = {reg, value & 0xFF, (value & 0xFF00) >> 8};
return twi_write(SI5351_ADDRESS, data, 3);
}
void si5351_init(uint32_t freq_xtal, uint32_t freq_a, uint32_t freq_b);
void si5351_set_freq(enum si5351_param_base base, uint32_t freq);
uint8_t si5351_write_params(enum si5351_param_base base, uint32_t p1, uint32_t p2, uint32_t p3);
#endif

9
firmware/main.c
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@ -8,13 +8,10 @@ int main(void) {
twi_init();
// Disable outputs
si5351_write8(3, 0xFF);
si5351_init(25000000, 900000000, 900000000);
si5351_set_freq(MULTISYNTH_0, 10000000);
// Powerdown output drivers
si5351_write8(16, 0x80);
si5351_write8(17, 0x80);
si5351_write8(18, 0x80);
while(1);
}

72
firmware/si5351.c Normal file
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@ -0,0 +1,72 @@
#include "si5351.h"
uint32_t si5351_freq_a;
uint32_t si5351_freq_b;
void si5351_init(uint32_t freq_xtal, uint32_t freq_a, uint32_t freq_b) {
si5351_write8(CLK_ENABLE_CONTROL, 0x00); // Enable all outputs
si5351_write8(XTAL_LOAD_CAP, 0xD2); //crystal load capacitor = 10pF
si5351_write8(CLK0_CONTROL, 0x0F); // PLLA to CLK0, 8 mA output
si5351_write8(PLL_RESET, 0xA0); // Reset both PLLs
si5351_freq_a = freq_a;
si5351_freq_b = freq_b;
double fdiv = (double) si5351_freq_a / (double) freq_xtal;
//TODO: Find better way to determine c and b
uint32_t c = 0x0FFFFF;
uint32_t a = (uint32_t) fdiv;
double rm = fdiv - a;
uint32_t b = rm * c;
uint32_t p1 = 128 * a + (128 * b / c) - 512;
uint32_t p2 = 128 * b - c * (128 * b / c);
uint32_t p3 = c;
si5351_write_params(PLL_A, p1, p2, p3);
fdiv = (double) freq_xtal / (double) si5351_freq_a;
//TODO: Find better way to determine c and b
c = 0x0FFFFF;
a = (uint32_t) fdiv;
rm = fdiv - a;
b = rm * c;
p1 = 128 * a + (128 * b / c) - 512;
p2 = 128 * b - c * (128 * b / c);
p3 = c;
si5351_write_params(PLL_B, p1, p2, p3);
}
void si5351_set_freq(enum si5351_param_base base, uint32_t freq) {
//TODO: Pick freq by clock source
double fdiv = (double) freq / (double) si5351_freq_a;
//TODO: Find better way to determine c and b
uint32_t c = 0x0FFFFF;
uint32_t a = (uint32_t) fdiv;
double rm = fdiv - a;
uint32_t b = rm * c;
uint32_t p1 = 128 * a + (128 * b / c) - 512;
uint32_t p2 = 128 * b - c * (128 * b / c);
uint32_t p3 = c;
si5351_write_params(base, p1, p2, p3);
}
uint8_t si5351_write_params(enum si5351_param_base base, uint32_t p1, uint32_t p2, uint32_t p3) {
uint8_t data[9] = {
base,
(p3 & 0x00FF00) >> 8,
p3 & 0x0000FF,
(p1 & 0x030000) >> 16,
(p1 & 0x00FF00) >> 8,
p1 & 0x0000FF,
((p3 & 0x0F0000) >> 12) | ((p2 & 0x0F0000) >> 16),
(p2 & 0x00FF00) >> 8,
p2 & 0x0000FF
};
return twi_write(SI5351_ADDRESS, data, 9);
}

43
firmware/test.c Normal file
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@ -0,0 +1,43 @@
#include <stdint.h>
#include <stdio.h>
int main(void) {
uint32_t si5351_freq_a = 400000000;
uint32_t freq_xtal = 25000000;
uint32_t out_freq = 400000000;
double fdiv = (double) si5351_freq_a / (double) freq_xtal;
//TODO: Find better way to determine c and b
uint32_t c = 0x0FFFFF;
uint32_t a = (uint32_t) fdiv;
double rm = fdiv - a;
uint32_t b = rm * c;
printf("%u + %u / %u\n", a, b, c);
uint32_t p1 = 128 * a + (128 * b / c) - 512;
uint32_t p2 = 128 * b - c * (128 * b / c);
uint32_t p3 = c;
printf("%u %u %u\n", p1, p2, p3);
fdiv = (double) out_freq / (double) si5351_freq_a;
//TODO: Find better way to determine c and b
c = 0x0FFFFF;
a = (uint32_t) fdiv;
rm = fdiv - a;
b = rm * c;
printf("%u + %u / %u\n", a, b, c);
p1 = 128 * a + (128 * b / c) - 512;
p2 = 128 * b - c * (128 * b / c);
p3 = c;
printf("%u %u %u\n", p1, p2, p3);
return 0;
}