Some output, wrong frequency
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546a9c7fde
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@ -4,8 +4,8 @@ ISPPORT ?= /dev/kaboard
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VERSION = 0.1
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HEADERS = include/twi.h
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SRC = main.c twi.c
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HEADERS = include/twi.h include/si5351.h
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SRC = main.c twi.c si5351.c
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TARGET = cube-kl
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OBJDIR = bin
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@ -5,16 +5,37 @@
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#include "twi.h"
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const uint8_t SI5351_ADDRESS = 96;
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static const uint8_t SI5351_ADDRESS = 96;
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enum si5351_param_base {
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PLL_A = 26,
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PLL_B = 34,
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MULTISYNTH_0 = 42,
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MULTOSYNTH_1 = 50,
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MULTISYNTH_2 = 58
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};
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enum si5351_reg {
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CLK_ENABLE_CONTROL = 3,
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PLLX_SRC = 15,
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CLK0_CONTROL = 16,
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CLK1_CONTROL = 17,
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CLK2_CONTROL = 18,
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PLL_RESET = 177,
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XTAL_LOAD_CAP = 183
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};
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static inline uint8_t si5351_write8(uint8_t reg, uint8_t value) {
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uint8_t data[3] = {reg, value};
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return twi_write(SI5351_ADDRESS, data, 2);
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}
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static inline uint8_t si5351_write16(uint8_t reg, uint16_t value) {
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uint8_t data[3] = {reg, value & 0xFF, (value & 0xFF00) >> 8};
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return twi_write(SI5351_ADDRESS, data, 3);
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}
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void si5351_init(uint32_t freq_xtal, uint32_t freq_a, uint32_t freq_b);
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void si5351_set_freq(enum si5351_param_base base, uint32_t freq);
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uint8_t si5351_write_params(enum si5351_param_base base, uint32_t p1, uint32_t p2, uint32_t p3);
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#endif
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@ -8,13 +8,10 @@ int main(void) {
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twi_init();
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// Disable outputs
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si5351_write8(3, 0xFF);
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si5351_init(25000000, 900000000, 900000000);
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si5351_set_freq(MULTISYNTH_0, 10000000);
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// Powerdown output drivers
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si5351_write8(16, 0x80);
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si5351_write8(17, 0x80);
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si5351_write8(18, 0x80);
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while(1);
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}
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@ -0,0 +1,72 @@
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#include "si5351.h"
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uint32_t si5351_freq_a;
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uint32_t si5351_freq_b;
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void si5351_init(uint32_t freq_xtal, uint32_t freq_a, uint32_t freq_b) {
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si5351_write8(CLK_ENABLE_CONTROL, 0x00); // Enable all outputs
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si5351_write8(XTAL_LOAD_CAP, 0xD2); //crystal load capacitor = 10pF
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si5351_write8(CLK0_CONTROL, 0x0F); // PLLA to CLK0, 8 mA output
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si5351_write8(PLL_RESET, 0xA0); // Reset both PLLs
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si5351_freq_a = freq_a;
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si5351_freq_b = freq_b;
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double fdiv = (double) si5351_freq_a / (double) freq_xtal;
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//TODO: Find better way to determine c and b
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uint32_t c = 0x0FFFFF;
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uint32_t a = (uint32_t) fdiv;
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double rm = fdiv - a;
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uint32_t b = rm * c;
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uint32_t p1 = 128 * a + (128 * b / c) - 512;
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uint32_t p2 = 128 * b - c * (128 * b / c);
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uint32_t p3 = c;
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si5351_write_params(PLL_A, p1, p2, p3);
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fdiv = (double) freq_xtal / (double) si5351_freq_a;
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//TODO: Find better way to determine c and b
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c = 0x0FFFFF;
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a = (uint32_t) fdiv;
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rm = fdiv - a;
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b = rm * c;
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p1 = 128 * a + (128 * b / c) - 512;
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p2 = 128 * b - c * (128 * b / c);
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p3 = c;
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si5351_write_params(PLL_B, p1, p2, p3);
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}
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void si5351_set_freq(enum si5351_param_base base, uint32_t freq) {
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//TODO: Pick freq by clock source
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double fdiv = (double) freq / (double) si5351_freq_a;
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//TODO: Find better way to determine c and b
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uint32_t c = 0x0FFFFF;
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uint32_t a = (uint32_t) fdiv;
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double rm = fdiv - a;
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uint32_t b = rm * c;
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uint32_t p1 = 128 * a + (128 * b / c) - 512;
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uint32_t p2 = 128 * b - c * (128 * b / c);
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uint32_t p3 = c;
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si5351_write_params(base, p1, p2, p3);
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}
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uint8_t si5351_write_params(enum si5351_param_base base, uint32_t p1, uint32_t p2, uint32_t p3) {
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uint8_t data[9] = {
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base,
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(p3 & 0x00FF00) >> 8,
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p3 & 0x0000FF,
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(p1 & 0x030000) >> 16,
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(p1 & 0x00FF00) >> 8,
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p1 & 0x0000FF,
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((p3 & 0x0F0000) >> 12) | ((p2 & 0x0F0000) >> 16),
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(p2 & 0x00FF00) >> 8,
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p2 & 0x0000FF
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};
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return twi_write(SI5351_ADDRESS, data, 9);
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}
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@ -0,0 +1,43 @@
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#include <stdint.h>
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#include <stdio.h>
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int main(void) {
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uint32_t si5351_freq_a = 400000000;
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uint32_t freq_xtal = 25000000;
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uint32_t out_freq = 400000000;
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double fdiv = (double) si5351_freq_a / (double) freq_xtal;
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//TODO: Find better way to determine c and b
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uint32_t c = 0x0FFFFF;
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uint32_t a = (uint32_t) fdiv;
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double rm = fdiv - a;
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uint32_t b = rm * c;
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printf("%u + %u / %u\n", a, b, c);
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uint32_t p1 = 128 * a + (128 * b / c) - 512;
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uint32_t p2 = 128 * b - c * (128 * b / c);
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uint32_t p3 = c;
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printf("%u %u %u\n", p1, p2, p3);
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fdiv = (double) out_freq / (double) si5351_freq_a;
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//TODO: Find better way to determine c and b
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c = 0x0FFFFF;
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a = (uint32_t) fdiv;
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rm = fdiv - a;
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b = rm * c;
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printf("%u + %u / %u\n", a, b, c);
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p1 = 128 * a + (128 * b / c) - 512;
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p2 = 128 * b - c * (128 * b / c);
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p3 = c;
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printf("%u %u %u\n", p1, p2, p3);
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return 0;
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}
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