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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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DC1846A LTC6947: Ultralow Noise and Spurious 0.35GHz to 6GHz FracN Synthesizer. More...
DC1846A LTC6947: Ultralow Noise and Spurious 0.35GHz to 6GHz FracN Synthesizer.
Setup: Set the terminal baud rate to 115200 and select the newline terminator. Refer to Demo Manual DC1846A. Ensure all jumpers are installed in the factory default positions. Two power supplies are needed for this demo board: a 5v and a 3.3v supply. The 5V powers the 5V supply and V+VCO turret. A reference frequency is also needed for this demo board, refer to the DC1846 Demo Manual for details. Command Description: *****Main Menu***** 1- Load Default Settings- Loads the SPI map that is identical to file LTC6947_100MHz.fracnset that is supplied with the FracNWizard and mentioned in the DC1846A user's manual. It assumes a 100MHz reference input and the default DC1846A BOM. It should output a 2415MHz signal on RF+/-. ** If you want to use a different loop filter, reference frequency or different register settings. Please use FracNWizard for the loop filter design and initial device setup. The register settings from FracNWizard can be entered into menu option 2. 2- READ/WRITE to Registers Addresses- Selecting this option will cause all the registers to be read, stored to variables, and displayed. The user will then have the option to write to one register address at a time. 3- READ/WRITE to Registers Fields- Selecting this option will allow the user to read or write to one register field name at a time. 4- This function calculates and programs OD, ND, NUM based on the desired Frf, the reference frequency, and the current RD value. Linduino One (Arduino Uno) are limited to 32 bit floats, int and doubles. Significant rounding errors are created with this 32 bit limitation. Therefore, this function uses 64bit math functions specifically created to overcome this limitation. After OD, ND, and NUM are programmed, the program calibrates the LTC6947. If other register need change see menu 2 or menu 3. 5- This function stores the current SPI settings in the demo boards EEPROM 6- This function loads SPI settings from the demo boards EEPROM to the device USER INPUT DATA FORMAT: decimal : 1024 hex : 0x400 octal : 02000 (leading 0 "zero") binary : B10000000000 float : 1024.0
http://www.linear.com/product/LTC6947
http://www.linear.com/product/LTC6947#demoboards
Copyright 2018(c) Analog Devices, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Definition in file DC1846A.ino.
Go to the source code of this file.
Functions | |
static void | print_title () |
Prints the title block when program first starts. More... | |
static void | print_prompt () |
Prints main menu. More... | |
static void | menu_1_load_default_settings () |
Menu 1: Load Default SPI Register Settings This function loads the register settings referenced in the DC1846A demo manual's quick start section. More... | |
static void | menu_2_RW_to_reg_addresss () |
Menu 2: Reads and/or Writes the SPI register address This function reads and displays all SPI register address settings in HEX format. More... | |
static void | menu_3_RW_to_reg_field () |
Menu 3: Reads and/or Writes individual SPI fields This function provides the user with a list of all SPI fields. More... | |
static void | menu_4_set_frf () |
Menu 4: Calculates and programs OD, ND, NUM based on desired Frf This function calculates and programs OD, ND, NUM based on desired Frf, the reference frequency, and current RD value. More... | |
static void | menu_5_store_settings () |
Store PLL settings to nonvolatile EEPROM on demo board. More... | |
static void | menu_6_restore_settings () |
Read stored PLL settings from nonvolatile EEPROM on demo board. More... | |
static void | setup () |
Initialize Linduino. More... | |
static void | loop () |
Repeats Linduino loop. More... | |
long | field_menu_RW (long field_val, char field_name[], uint8_t f) |
Support function for function menu_3_RW_to_reg_field displays current state of select field provides user the option to write to that field or return to menu. More... | |
static void | LTC6947_VCO_Freq_Verification () |
verifies VCO frequency is within datasheet specifications More... | |
static void | LTC6947_Ref_Freq_Verification () |
verifies reference frequency is within datasheet specifications More... | |
static void | LTC6947_Fout_Freq_Verification () |
verifies frf frequency is within datasheet specifications More... | |
Variables | |
static uint8_t | ref_out = 0 |
Used to keep track of reference out status. More... | |
static int8_t | demo_board_connected |
Demo Board Name stored in QuikEval EEPROM. More... | |
static uint8_t | First_Run =0 |
if first time through loop = 0, otherwise=1 More... | |
long field_menu_RW | ( | long | field_val, |
char | field_name[], | ||
uint8_t | f | ||
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Support function for function menu_3_RW_to_reg_field displays current state of select field provides user the option to write to that field or return to menu.
field_val | current state of the selected field |
field_name | SPI Field name selected |
f | SPI field identifier identifies selected fields information in SPI MAP arrays |
Definition at line 294 of file DC1846A.ino.
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verifies frf frequency is within datasheet specifications
Definition at line 862 of file DC1846A.ino.
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verifies reference frequency is within datasheet specifications
Definition at line 816 of file DC1846A.ino.
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verifies VCO frequency is within datasheet specifications
Definition at line 748 of file DC1846A.ino.
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Menu 1: Load Default SPI Register Settings This function loads the register settings referenced in the DC1846A demo manual's quick start section.
The register settings loaded are the same as FRACN WIZARDS fracnset files LTC6947_100MHz.fracnset The setting loaded with this function assume the LTC6947's reference is set to 100MHz and the DC1846A's BOM has not been modified.
Definition at line 217 of file DC1846A.ino.
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Menu 2: Reads and/or Writes the SPI register address This function reads and displays all SPI register address settings in HEX format.
It then provides an option to modify(write to) individual registers one at time
EXAMPLE:
Definition at line 239 of file DC1846A.ino.
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Menu 3: Reads and/or Writes individual SPI fields This function provides the user with a list of all SPI fields.
The user can select a SPI field to read its current value. Then the user will be provided with an option to write to that field or return to the selection menu.
EXAMPLE:
Definition at line 354 of file DC1846A.ino.
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Menu 4: Calculates and programs OD, ND, NUM based on desired Frf This function calculates and programs OD, ND, NUM based on desired Frf, the reference frequency, and current RD value.
Linduino One (Arduino Uno) are limited to 32 bit floats, int and doubles. Significant rounding errors are created with this 32 bit limitation. Therefore, This function uses 64bit math functions specifically created to overcome this limitation. If RD needs to change see menu 2 or menu 3
Definition at line 932 of file DC1846A.ino.
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Store PLL settings to nonvolatile EEPROM on demo board.
Definition at line 954 of file DC1846A.ino.
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Read stored PLL settings from nonvolatile EEPROM on demo board.
Definition at line 980 of file DC1846A.ino.
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Prints main menu.
Definition at line 1040 of file DC1846A.ino.
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Prints the title block when program first starts.
Definition at line 1016 of file DC1846A.ino.
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Demo Board Name stored in QuikEval EEPROM.
Definition at line 122 of file DC1846A.ino.
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if first time through loop = 0, otherwise=1
Definition at line 123 of file DC1846A.ino.
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Used to keep track of reference out status.
Definition at line 121 of file DC1846A.ino.