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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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DC1795A LTC6950: 1.4GHz Low Phase Noise, Low Jitter PLL with Clock Distribution. More...
DC1795A LTC6950: 1.4GHz Low Phase Noise, Low Jitter PLL with Clock Distribution.
Setup: Set the terminal baud rate to 115200 and select the newline terminator. Refer to Demo Manual DC1795A. 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. Command Description: *****Main Menu***** 1- Load Default Settings- Loads the SPI map that is identical to file LTC6950_ALL_CHAN_250MHz.clkset that is supplied with the ClockWizard and mentioned in the DC1795A user's manual. It assumes a 100MHz reference input, a 1GHz VCO input and the default DC1795A BOM. It should output a 250MHz signal on all outputs. ** If you want to use a different loop filter, reference frequency or different register settings. Please use ClockWizard for the loop filter design and initial device setup. The register settings from ClockWizard 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 LTC6950. 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/LTC6950
http://www.linear.com/product/LTC6950#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 DC1795A.ino.
Go to the source code of this file.
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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 DC1795A 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 | LTC6950_VCO_Freq_Verification () |
verifies VCO frequency is within datasheet specifications More... | |
static void | LTC6950_Ref_Freq_Verification () |
verifies reference frequency is within datasheet specifications More... | |
static void | LTC6950_Fout_Freq_Verification () |
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 292 of file DC1795A.ino.
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Definition at line 938 of file DC1795A.ino.
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verifies reference frequency is within datasheet specifications
Definition at line 890 of file DC1795A.ino.
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verifies VCO frequency is within datasheet specifications
Definition at line 823 of file DC1795A.ino.
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Menu 1: Load Default SPI Register Settings This function loads the register settings referenced in the DC1795A demo manual's quick start section.
The register settings loaded are the same as CLOCK WIZARDS clkset files LTC6950_PECL0_250MHz.clkset The setting loaded with this function assume the LTC6950's reference is set to 100MHz, the VCO input is set to 1GHz and the DC1795A's BOM has not been modified.
Definition at line 215 of file DC1795A.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 237 of file DC1795A.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 353 of file DC1795A.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 1008 of file DC1795A.ino.
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Store PLL settings to nonvolatile EEPROM on demo board.
Definition at line 1030 of file DC1795A.ino.
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Read stored PLL settings from nonvolatile EEPROM on demo board.
Definition at line 1056 of file DC1795A.ino.
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Prints main menu.
Definition at line 1118 of file DC1795A.ino.
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Prints the title block when program first starts.
Definition at line 1093 of file DC1795A.ino.
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Demo Board Name stored in QuikEval EEPROM.
Definition at line 120 of file DC1795A.ino.
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if first time through loop = 0, otherwise=1
Definition at line 121 of file DC1795A.ino.
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Used to keep track of reference out status.
Definition at line 119 of file DC1795A.ino.