| Linduino 1.3.0 Linear Technology Arduino-Compatible Demonstration Board

DC2289AA.ino
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1 /*!
2 LTC2380-24: Low Noise, High Speed, 24-Bit SAR ADC With Digital Filter
3
4 @verbatim
5
6
7 @endverbatim
8 http://www.linear.com/product/LTC2380-24
9
10
11 Copyright 2018(c) Analog Devices, Inc.
12
13 All rights reserved.
14
15 Redistribution and use in source and binary forms, with or without
16 modification, are permitted provided that the following conditions are met:
17 - Redistributions of source code must retain the above copyright
18 notice, this list of conditions and the following disclaimer.
19 - Redistributions in binary form must reproduce the above copyright
20 notice, this list of conditions and the following disclaimer in
21 the documentation and/or other materials provided with the
22 distribution.
23 - Neither the name of Analog Devices, Inc. nor the names of its
24 contributors may be used to endorse or promote products derived
25 from this software without specific prior written permission.
26 - The use of this software may or may not infringe the patent rights
27 of one or more patent holders. This license does not release you
28 from the requirement that you obtain separate licenses from these
29 patent holders to use this software.
30 - Use of the software either in source or binary form, must be run
31 on or directly connected to an Analog Devices Inc. component.
32
33 THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
34 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
35 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
36 IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
37 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
38 LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
39 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
40 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
41 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
42 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 */
44
45 /*! @file
46 @ingroup LTC2380-24
47 */
48
49 #include <stdint.h>
50 #include "Linduino.h"
51 #include "LT_SPI.h"
52 #include "UserInterface.h"
53 #include "LT_I2C.h"
54 #include <SPI.h>
55 #include "LTC2380_24.h"
56
57 #ifndef LTC2380_CNV
58 #define LTC2380_CNV QUIKEVAL_CS
59 #endif
60
61 // Function Declaration
62 void print_title(); // Print the title block
63 void print_prompt();
64 void menu_1_read_input();
65 void menu_2_select_gain_compression();
66 void configureCNV();
67
68 // Global variables
69 static uint8_t LTC2380_dgc = 0; //!< Default set for no gain compression
70 float LTC2380_vref = 10;
71 float voltage;
72
73 //! Initialize Linduino
74 void setup()
75 {
76 quikeval_SPI_init(); // Configure the spi port for 4MHz SCK
77 quikeval_SPI_connect(); // Connect SPI to main data port
78 Serial.begin(115200); // Initialize the serial port to the PC
79
80 configureCNV();
81
82 print_title();
83 print_prompt();
84 }
85
86 //! Repeats Linduino loop
87 void loop()
88 {
89 uint16_t user_command;
90 if (Serial.available())
91 {
92 user_command = read_int(); // Read the user command
93 if (user_command != 'm')
94 Serial.println(user_command); // Prints the user command to com port
95 switch (user_command)
96 {
97 case 1:
98 menu_1_read_input();
99 break;
100 case 2:
101 menu_2_select_gain_compression();
102 break;
103 default:
104 Serial.println(" Invalid Option");
105 break;
106 }
107 Serial.println();
108 print_prompt();
109 }
110 }
111
112 //! Read Input voltage
113 //! @return void
114 void menu_1_read_input()
115 {
116 int32_t adc_code; // The LTC2380 code
117 float adc_voltage;
118 int16_t cycles;
119
120 LTC2380_read(&adc_code, &cycles);
121 adc_voltage = LTC2380_code_to_voltage(adc_code, LTC2380_dgc, LTC2380_vref); // Convert the received code to voltage
122
123 Serial.print("\n24-bit decimal data: 0x ");
124 Serial.println(adc_code & 0xFFFFFF, HEX);
125 Serial.print("Voltage calculated: ");
126 Serial.print(adc_voltage);
127 Serial.println(" V");
128 Serial.print("No:of averaging cycles: ");
129 Serial.println(cycles + 1);
130 Serial.println();
131 }
132
133 //! Select gain compression
134 //! @return void
135 void menu_2_select_gain_compression()
136 {
137 uint8_t user_command;
138 Serial.println(F(" 0 = No Gain Compression"));
139 Serial.println(F(" 1 = Gain Compression"));
140 Serial.print(F(" Enter a Command, based upon the position of jumper JP6: "));
141
142 user_command = read_int(); // Read user input
143 Serial.println(user_command); // Prints the user command to com port
144 switch (user_command)
145 {
146 case 0:
147 Serial.println(F(" No Gain compression"));
148 LTC2380_dgc = 0;
149 break;
150 case 1:
151 Serial.println(F(" Gain compression"));
152 LTC2380_dgc = 1;
153 break;
154 default:
155 {
156 Serial.println(" Invalid Option");
157 return;
158 }
159 break;
160 }
161 }
162
163 //! Prints main menu.
164 void print_prompt()
165 {
166 Serial.println(F("*************************"));
167 Serial.println(F("1-Read ADC Input"));
168 Serial.println(F("2-Select No Gain Compression / Gain Compression (default is no compression)"));
169 Serial.print(F("Enter a command:"));
170 }
171
172 //! Prints the title block when program first starts.
173 void print_title()
174 {
175 Serial.println();
176 Serial.println(F("*****************************************************************"));
177 Serial.println(F("* DC2289A Demonstration Program *"));
178 Serial.println(F("* *"));
179 Serial.println(F("* This program demonstrates how to read data *"));
180 Serial.println(F("* from LTC2380-24 bit part. *"));
181 Serial.println(F("* *"));
182 Serial.println(F("* Set the baud rate to 115200 and select the newline terminator.*"));
183 Serial.println(F("* *"));
184 Serial.println(F("*****************************************************************"));
185 }
186
187 //! Function to configure CNV pin as an output
188 void configureCNV()
189 {
190 DDRB = DDRB | B00000100; // Setting PB2 (CS) as output, connected to CNV pin.
191 }
print_title
static void print_title()
Prints the title block when program first starts.
Definition: DC2289AA.ino:173
user_command
unsigned char user_command
Definition: Serial_EEPROM_Test.ino:75
loop
static void loop()
Repeats Linduino loop.
Definition: DC2289AA.ino:87
LTC2380_dgc
static uint8_t LTC2380_dgc
Default set for no gain compression.
Definition: DC2289AA.ino:69
Linduino.h
Header File for Linduino Libraries and Demo Code.
configureCNV
static void configureCNV()
Function to configure CNV pin as an output.
Definition: DC2289AA.ino:188
adc_voltage
static float adc_voltage
Definition: DC2071AA.ino:115
LTC2380_read
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
LTC2380_24.h
LTC2380-24: Low Noise, High Speed, 24-Bit SAR ADC With Digital Filter.
quikeval_SPI_init
void quikeval_SPI_init(void)
Configure the SPI port for 4Mhz SCK.
Definition: LT_SPI.cpp:151
LT_SPI.h
LT_SPI: Routines to communicate with ATmega328P&#39;s hardware SPI port.
menu_2_select_gain_compression
static void menu_2_select_gain_compression()
Select gain compression.
Definition: DC2289AA.ino:135
print_prompt
static void print_prompt()
Prints main menu.
Definition: DC2289AA.ino:164
LT_I2C.h
LT_I2C: Routines to communicate with ATmega328P&#39;s hardware I2C port.
quikeval_SPI_connect
void quikeval_SPI_connect()
Connect SPI pins to QuikEval connector through the Linduino MUX. This will disconnect I2C...
Definition: LT_SPI.cpp:138
UserInterface.h
read_int
int32_t read_int()
Definition: UserInterface.cpp:93
LTC2380_code_to_voltage
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
menu_1_read_input
static void menu_1_read_input()
Read Input voltage.
Definition: DC2289AA.ino:114
voltage
static float voltage
Definition: DC2289AA.ino:71
setup
static void setup()
Initialize Linduino.
Definition: DC2289AA.ino:74
LTC2380_vref
static float LTC2380_vref
Definition: DC2289AA.ino:70
adc_code
static uint32_t adc_code
Definition: DC2071AA.ino:113