Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board
DC1783A.ino
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1 /*!
2 Linear Technology DC1783A Demonstration Board.
3 LTC2376-16: 16-Bit, 250Ksps ADC
4 LTC2376-18: 18-Bit, 250Ksps ADC
5 LTC2377-16: 16-Bit, 500Ksps ADC
6 LTC2377-18: 18-Bit, 500Ksps ADC
7 LTC2380-16: 16-Bit, 1Msps ADC
8 LTC2380-18: 18-Bit, 1Msps ADC
9 LTC2379-18: 18-Bit, 1.6Msps ADC
10 LTC2380-16: 16-Bit, 2Msps ADC
11 Max SCK rate is 100MHz.
12 
13 @verbatim
14 
15 NOTES
16  Setup:
17  Set the terminal baud rate to 115200 and select the newline terminator. Equipment
18  required is a voltage source (preferably low-noise) and a precision voltmeter.
19  Ensure all jumpers on the demo board are installed in their default positions
20  from the factory. Refer to Demo Manual DC1783A.
21 
22  How to test:
23  The voltage source should be connected between inputs AIN+ and AIN-. Ensure both
24  inputs are within their specified absolute input voltage range. (It is easiest
25  to tie the voltage source negative terminal to COM.) Ensure the voltage
26  source is set within the range of 0V to +5V (differential voltage range).
27  (Swapping input voltages results in a reversed polarity reading.)
28 
29 USER INPUT DATA FORMAT:
30  decimal : 1024
31  hex : 0x400
32  octal : 02000 (leading 0 "zero")
33  binary : B10000000000
34  float : 1024.0
35 
36 @endverbatim
37 http://www.linear.com/product/LTC2376-16
38 http://www.linear.com/product/LTC2376-18
39 http://www.linear.com/product/LTC2377-16
40 http://www.linear.com/product/LTC2377-18
41 http://www.linear.com/product/LTC2380-16
42 http://www.linear.com/product/LTC2380-18
43 http://www.linear.com/product/LTC2379-18
44 http://www.linear.com/product/LTC2380-16
45 
46 http://www.linear.com/product/LTC2376-16#demoboards
47 http://www.linear.com/product/LTC2376-18#demoboards
48 http://www.linear.com/product/LTC2377-16#demoboards
49 http://www.linear.com/product/LTC2377-18#demoboards
50 http://www.linear.com/product/LTC2380-16#demoboards
51 http://www.linear.com/product/LTC2380-18#demoboards
52 http://www.linear.com/product/LTC2379-18#demoboards
53 http://www.linear.com/product/LTC2380-16#demoboards
54 
55 
56 Copyright 2018(c) Analog Devices, Inc.
57 
58 All rights reserved.
59 
60 Redistribution and use in source and binary forms, with or without
61 modification, are permitted provided that the following conditions are met:
62  - Redistributions of source code must retain the above copyright
63  notice, this list of conditions and the following disclaimer.
64  - Redistributions in binary form must reproduce the above copyright
65  notice, this list of conditions and the following disclaimer in
66  the documentation and/or other materials provided with the
67  distribution.
68  - Neither the name of Analog Devices, Inc. nor the names of its
69  contributors may be used to endorse or promote products derived
70  from this software without specific prior written permission.
71  - The use of this software may or may not infringe the patent rights
72  of one or more patent holders. This license does not release you
73  from the requirement that you obtain separate licenses from these
74  patent holders to use this software.
75  - Use of the software either in source or binary form, must be run
76  on or directly connected to an Analog Devices Inc. component.
77 
78 THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
79 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
80 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
81 IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
82 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
83 LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
84 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
85 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
86 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
87 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
88 */
89 
90 /*! @file
91  @ingroup LTC2380
92 */
93 
94 #include <Arduino.h>
95 #include <stdint.h>
96 #include "Linduino.h"
97 #include "LT_SPI.h"
98 #include "UserInterface.h"
99 #include "LT_I2C.h"
100 #include "QuikEval_EEPROM.h"
101 #include "LTC2380.h"
102 #include <SPI.h>
103 #include <Wire.h>
104 
105 // Function Declaration
106 void print_title(); // Print the title block
107 void print_prompt(); // Prompt the user for an input command
108 void print_user_command(uint8_t menu); // Display selected differential channels
109 
110 void menu_1_read_input();
112 void menu_3_select_bits();
113 
114 // Global variables
115 static uint8_t LTC2380_dgc = 0; //!< Default set for no gain compression
116 static uint8_t LTC2380_bits = 18; //!< Default set for 18 bits
117 float LTC2380_vref = 5;
118 
119 
120 //! Initialize Linduino
121 void setup()
122 {
123  uint32_t adc_code;
124  quikeval_I2C_init(); // Configure the EEPROM I2C port for 100kHz
125  quikeval_SPI_init(); // Configure the spi port for 4MHz SCK
126  quikeval_SPI_connect(); // Connect SPI to main data port
127  Serial.begin(115200); // Initialize the serial port to the PC
128  print_title();
129  print_prompt();
130 }
131 
132 
133 //! Repeats Linduino loop
134 void loop()
135 {
136  uint16_t user_command;
137  {
138  if (Serial.available())
139  {
140  user_command = read_int(); // Read the user command
141  if (user_command != 'm')
142  Serial.println(user_command); // Prints the user command to com port
143  switch (user_command)
144  {
145  case 1:
147  break;
148  case 2:
150  break;
151  case 3:
153  break;
154  default:
155  Serial.println("Invalid Option");
156  break;
157  }
158  Serial.println();
159  print_prompt();
160  }
161  }
162 }
163 
164 
165 // Function Definitions
166 //! Read channel
167 //! @return void
169 {
170  uint8_t user_command;
171  int32_t adc_code; // The LTC2380 code
172  int32_t display_code;
173  float adc_voltage; // The LTC2380 voltage
174 
175  // Read and display a selected channel
176  LTC2380_read(LTC2380_CS, &adc_code); //discard the first reading
177  delay(100);
178  LTC2380_read(LTC2380_CS, &adc_code);
179 
180  display_code = adc_code >> (32 - LTC2380_bits);
181  if (LTC2380_bits == 16)
182  display_code = display_code & 0xFFFF;
183  else
184  display_code = display_code & 0x3FFFF;
185 
186  Serial.print(F(" Received Code: b"));
187  Serial.println(display_code, BIN);
188 
189  // Convert the received code to voltage
190  adc_voltage = LTC2380_code_to_voltage(adc_code, LTC2380_dgc, LTC2380_vref);
191 
192  Serial.print(F(" Equivalent voltage: "));
193  Serial.print(adc_voltage, 4);
194  Serial.println(F("V"));
195 }
196 
197 
198 //! Select gain compression
199 //! @return void
201 {
202  uint8_t user_command;
203 
204  Serial.println(F(" 0 = No Gain Compression"));
205  Serial.println(F(" 1 = Gain Compression"));
206  Serial.print(F(" Enter a Command, based upon the position of jumper JP6: "));
207 
208  user_command = read_int(); // Read user input
209  Serial.println(user_command); // Prints the user command to com port
210  switch (user_command)
211  {
212  case 0:
213  Serial.println(F(" No Gain compression"));
214  LTC2380_dgc = 0;
215  break;
216  case 1:
217  Serial.println(F(" Gain compression"));
218  LTC2380_dgc = 1;
219  break;
220  default:
221  {
222  Serial.println(" Invalid Option");
223  return;
224  }
225  break;
226  }
227 }
228 
229 
230 //! Select number of bits
231 //! @return void
233 {
234  uint8_t user_command;
235 
236  Serial.println(F(" 16 = 237X-16"));
237  Serial.println(F(" 18 = 237X-18"));
238  Serial.print(F(" Enter a Command, based upon the resolution of the part under test: "));
239 
240  user_command = read_int(); // Read user input
241  Serial.println(user_command); // Prints the user command to com port
242  switch (user_command)
243  {
244  case 16:
245  Serial.println(F(" 16 bits selected"));
246  LTC2380_bits = 16;
247  break;
248  case 18:
249  Serial.println(F(" 18 bits selected"));
250  LTC2380_bits = 18;
251  break;
252  default:
253  {
254  Serial.println(" Invalid Option");
255  return;
256  }
257  break;
258  }
259 }
260 
261 
262 //! Prints the title block when program first starts.
264 {
265  Serial.println();
266  Serial.println(F("*****************************************************************"));
267  Serial.println(F("* DC1783A Demonstration Program *"));
268  Serial.println(F("* *"));
269  Serial.println(F("* This program demonstrates how to receive data *"));
270  Serial.println(F("* from the following ADCs: *"));
271  Serial.println(F("* LTC2376-16 *"));
272  Serial.println(F("* LTC2376-18 *"));
273  Serial.println(F("* LTC2377-16 *"));
274  Serial.println(F("* LTC2376-18 *"));
275  Serial.println(F("* LTC2378-16 *"));
276  Serial.println(F("* LTC2378-18 *"));
277  Serial.println(F("* LTC2379-18 *"));
278  Serial.println(F("* LTC2380-16 *"));
279  Serial.println(F("* *"));
280  Serial.println(F("* Set the baud rate to 115200 and select the newline terminator.*"));
281  Serial.println(F("* *"));
282  Serial.println(F("*****************************************************************"));
283 }
284 
285 
286 //! Prints main menu.
288 {
289  Serial.println(F("*************************"));
290  Serial.println(F("1-Read ADC Input"));
291  Serial.println(F("2-Select No Gain Compression / Gain Compression (Default is no compression)"));
292  Serial.println(F("3-Select Number of bits (Default is 18 bits)\n"));
293  Serial.print(F("Enter a command:"));
294 }
295 
static uint8_t LTC2380_bits
Default set for 18 bits.
Definition: DC1783A.ino:116
unsigned char user_command
static void setup()
Initialize Linduino.
Definition: DC1783A.ino:121
static void menu_1_read_input()
Read channel.
Definition: DC1783A.ino:168
Header File for Linduino Libraries and Demo Code.
static void print_title()
Prints the title block when program first starts.
Definition: DC1783A.ino:263
static void menu_2_select_gain_compression()
Select gain compression.
Definition: DC1783A.ino:200
static void menu_3_select_bits()
Select number of bits.
Definition: DC1783A.ino:232
static float adc_voltage
Definition: DC2071AA.ino:115
#define LTC2380_CS
Define the SPI CS pin.
Definition: LTC2380.h:117
void LTC2380_read(uint8_t cs, int32_t *ptr_adc_code)
Reads the LTC2380 and returns 32-bit data in 2&#39;s complement format.
Definition: LTC2380.cpp:114
static void print_user_command(uint8_t menu)
static float LTC2380_vref
Definition: DC1783A.ino:117
QuikEval EEPROM Library.
void quikeval_SPI_init(void)
Configure the SPI port for 4Mhz SCK.
Definition: LT_SPI.cpp:151
static void loop()
Repeats Linduino loop.
Definition: DC1783A.ino:134
LT_SPI: Routines to communicate with ATmega328P&#39;s hardware SPI port.
static uint8_t LTC2380_dgc
Default set for no gain compression.
Definition: DC1783A.ino:115
LT_I2C: Routines to communicate with ATmega328P&#39;s hardware I2C port.
static void print_prompt()
Prints main menu.
Definition: DC1783A.ino:287
void quikeval_SPI_connect()
Connect SPI pins to QuikEval connector through the Linduino MUX. This will disconnect I2C...
Definition: LT_SPI.cpp:138
int32_t read_int()
float LTC2380_code_to_voltage(int32_t adc_code, uint8_t gain_compression, float vref)
Calculates the LTC2380 input voltage given the binary data and lsb weight.
Definition: LTC2380.cpp:136
static int32_t display_code
Definition: DC2071AA.ino:114
void quikeval_I2C_init(void)
Initializes Linduino I2C port.
Definition: LT_I2C.cpp:394
LTC2376-16: 16-Bit, 250Ksps ADC LTC2376-18: 18-Bit, 250Ksps ADC LTC2376-20: 20-Bit, 250Ksps ADC LTC2377-16: 16-Bit, 500Ksps ADC LTC2377-18: 18-Bit, 500Ksps ADC LTC2377-20: 20-Bit, 500Ksps ADC LTC2378-16: 16-Bit, 1Msps ADC LTC2378-18: 18-Bit, 1Msps ADC LTC2378-20: 20-Bit, 1Msps ADC LTC2379-18: 18-Bit, 1.6Msps ADC LTC2380-16: 16-Bit, 2Msps ADC.
static uint32_t adc_code
Definition: DC2071AA.ino:113