Si5351 C++ Library for STM32

This is a C++ library for Si5351 to be used with STM32 HAL, ported directly from the library for Arduino. Almost all interfaces are the same as those in the Arduino library. Differences are self-explanatory. Refer to the Arduino project for the complete reference of the interfaces.

C wrapper functions for a few of the essential C++ interfaces are provided and they can be called from C files (for example main.c in a project created in STM32Cube).

Usage

Modify the include line below in si5351_def.h according to the device family:

/* si5351_def.h */
#include "stm32f1xx_hal.h"

Include si5351_c_wrapper.h, for exmaple in main.c:

/* main.c */
#include "si5351_c_wrapper.h"

Create and initialize a Si5351 struct after the initialization of the I2C interfaces:

/* after the initialization of the I2C interfaces */
struct Si5351* si5351 = Si5351_create(&hi2c1, SI5351_BUS_BASE_ADDR);
Si5351_init(si5351, SI5351_CRYSTAL_LOAD_10PF, 0, 0);

Set output frequency and enable clock output:

uint64_t freq_Hz = 1000000; /* 4 kHz< freq < 225 Mhz */
uint8_t set_freq_result = Si5351_set_freq(si5351, i*100, SI5351_CLK0);
Si5351_output_enable(si5351, SI5351_CLK0, 1);

Check status registers:

HAL_Delay(500); /* Insert a delay if Si5351_update_status() is called right after Si5351 settings are changed */
Si5351_update_status(si5351);
struct Si5351Status status5351 = Si5351_status(si5351);

Set drive strength if desired:

Si5351_drive_strength(si5351, SI5351_CLK0, SI5351_DRIVE_6MA);