ClockGeneration

STM32F103C8T6 Blue pill

16MHz clock quarz oscilator

• SPI
  • MOSI - PA7
  • SCK - PA5
  • CS - PA4
• USB-CDC Boudrate 115200

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ADF435x

ADF4351

• Clock 35-4400MHz
• Jitter 0.3ps
• Power -4dbm - +5dBm
• Interface SPI Half-duplex

ADF4350

• Clock 137.5-4400MHz
• Jitter 0.4ps
• Power -4dbm - +5dBm
• Interface SPI Half-duplex

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Function

typedef struct
{
	TypeIcTypeDef Type_ic;
	uint32_t ref_clk;

	// Register 0:
	uint16_t INT;
	uint16_t FRAC;

	// Register 1:
	uint8_t phase_adj;
	uint8_t prescaler;
	uint16_t phase;
	uint16_t MOD;

	// Register 2:
	uint8_t low_noise_spur;
	uint8_t muxout;

	uint8_t ref_doubler;

	uint8_t rdiv2;
	uint16_t r_counter;
	uint8_t dbl_buf;
	uint8_t charge_pump_current;
	uint8_t ldf;
	uint8_t ldp;
	uint8_t pd_polarity;
	uint8_t powerdown;
	uint8_t cp_three_state;
	uint8_t counter_reset;

	// Register 3:
	uint8_t band_mode_clksel;
	uint8_t abp;
	uint8_t chg_cancel;
	uint8_t csr;
	uint8_t clkdiv_mode;
	uint16_t clock_divider;

	// Register 4:
	uint8_t feedback_sel;
	uint8_t rf_div_sel;   // 0 = /1, 1=/2, 2=/4 ...
	uint8_t band_select_clkdiv;
	uint8_t vco_pwrdown;
	uint8_t mtld;
	uint8_t aux_outsel;
	uint8_t aux_outena;
	uint8_t aux_pwr;
	uint8_t rf_ena; // 0 - output disabled
	uint8_t out_pwr; // 0 - min, 3 - max

	// Register 5:
	uint8_t ld_pinmode;

	uint32_t reg[6];

	uint32_t pfd_freq;
	uint32_t freqence;

	void (*low_CS)(void);
	void (*high_CS)(void);
	void (*send_message)(uint8_t *buff, uint8_t size);
	void (*delay)(uint32_t value);

} adf435xSettings;

Initialization Ic, where

• "reference_clock" - clock oscilator
• "cs_low_t" - function ptr on CS LOW state
• "cs_high_t" - function ptr on CS HIGH state
• "SPI_send" - function ptr on send SPI packet
• "delay_t" - function ptr on delay

adf435xSettings adf4351; // Create prototype IC

uint8_t adf435x_init(adf435xSettings *obj, TypeIcTypeDef type,
		uint32_t reference_clock, void (*cs_low_t)(void),
		void (*cs_high_t)(void), void (*SPI_send)(uint8_t*, uint8_t),
		void (*delay_t)(uint32_t));

Calculating register IC value, where

• "freq" - clock value set

uint8_t prepare_registers(adf435xSettings *obj, uint32_t freq);

Send value register IC

void updateAllRegisters(adf435xSettings *obj);

Set frequence output, where

• "freq" - clock value set

uint8_t set_clock(adf435xSettings *obj, uint32_t freq);