NanoVNA/si5351.h

/*
 * Copyright (c) 2014-2015, TAKAHASHI Tomohiro (TTRFTECH) edy555@gmail.com
 * All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * The software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */
//#define SI5351_PLL_A	0
//#define SI5351_PLL_B	1

#define SI5351_MULTISYNTH_DIV_4  4
#define SI5351_MULTISYNTH_DIV_6  6
#define SI5351_MULTISYNTH_DIV_8  8
#define SI5351_R_DIV_1		(0<<4)
#define SI5351_R_DIV_2		(1<<4)
#define SI5351_R_DIV_4		(2<<4)
#define SI5351_R_DIV_8		(3<<4)
#define SI5351_R_DIV_16		(4<<4)
#define SI5351_R_DIV_32		(5<<4)
#define SI5351_R_DIV_64		(6<<4)
#define SI5351_R_DIV_128	(7<<4)
#define SI5351_DIVBY4 		(3<<2)

#define SI5351_REG_3_OUTPUT_ENABLE_CONTROL  3
#define SI5351_CLK0_EN     (1<<0)
#define SI5351_CLK1_EN     (1<<2)
#define SI5351_CLK2_EN     (1<<3)

#define SI5351_REG_16_CLK0_CONTROL	16
#define SI5351_REG_17_CLK1_CONTROL	17
#define SI5351_REG_18_CLK2_CONTROL	18
#define SI5351_REG_PLL_A 			26
#define SI5351_REG_PLL_B 			34
#define SI5351_REG_42_MULTISYNTH0	42
#define SI5351_REG_50_MULTISYNTH1	50
#define SI5351_REG_58_MULTISYNTH2	58

#define SI5351_CLK_POWERDOWN			    (1<<7)
#define SI5351_CLK_INTEGER_MODE		     	(1<<6)
#define SI5351_CLK_PLL_SELECT_B		     	(1<<5)
#define SI5351_CLK_INVERT				    (1<<4)

#define SI5351_CLK_INPUT_MASK			    (3<<2)
#define SI5351_CLK_INPUT_XTAL			    (0<<2)
#define SI5351_CLK_INPUT_CLKIN			    (1<<2)
#define SI5351_CLK_INPUT_MULTISYNTH_0_4 	(2<<2)
#define SI5351_CLK_INPUT_MULTISYNTH_N	 	(3<<2)

#define SI5351_CLK_DRIVE_STRENGTH_MASK		(3<<0)
#define SI5351_CLK_DRIVE_STRENGTH_2MA		(0<<0)
#define SI5351_CLK_DRIVE_STRENGTH_4MA		(1<<0)
#define SI5351_CLK_DRIVE_STRENGTH_6MA	 	(2<<0)
#define SI5351_CLK_DRIVE_STRENGTH_8MA		(3<<0)


#define SI5351_REG_177_PLL_RESET 	177
#define SI5351_PLL_RESET_B 			(1<<7)
#define SI5351_PLL_RESET_A 			(1<<5)

#define SI5351_REG_183_CRYSTAL_LOAD 183
#define SI5351_CRYSTAL_LOAD_6PF  	(1<<6)
#define SI5351_CRYSTAL_LOAD_8PF  	(2<<6)
#define SI5351_CRYSTAL_LOAD_10PF  	(3<<6)

#define SI5351_CRYSTAL_FREQ_25MHZ 	25000000

void si5351_init(void);

void si5351_disable_output(void);
void si5351_enable_output(void);
void si5351_set_frequency(int channel, uint32_t freq, uint8_t drive_strength);
int  si5351_set_frequency_with_offset(uint32_t freq, int offset, uint8_t drive_strength);