Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board
LTC2370.cpp
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1 /*!
2 LTC2364-16: 16-Bit, 250Ksps ADC.
3 LTC2364-18: 18-Bit, 250Ksps ADC.
4 LTC2367-16: 16-Bit, 500Ksps ADC
5 LTC2367-18: 18-Bit, 500Ksps ADC
6 LTC2368-16: 16-Bit, 1Msps ADC
7 LTC2368-18: 18-Bit, 1Msps ADC
8 LTC2369-18: 18-Bit, 1.6Msps ADC
9 LTC2370-16: 16-Bit, 2Msps ADC
10 
11 @verbatim
12 
13 The following parts (DUT) are pin-compatible, 16/18-bit A/D converters with serial I/O, and an internal reference:
14 LTC2364-16: 16-Bit, 250Ksps ADC
15 LTC2364-18: 18-Bit, 250Ksps ADC
16 LTC2367-16: 16-Bit, 500Ksps ADC
17 LTC2367-18: 18-Bit, 500Ksps ADC
18 LTC2368-16: 16-Bit, 1Msps ADC
19 LTC23678-18: 18-Bit, 1Msps ADC
20 LTC2369-18: 18-Bit, 1.6Msps ADC
21 LTC2370-16: 16-Bit, 2Msps ADC
22 
23 @endverbatim
24 
25 http://www.linear.com/product/LTC2364-16
26 http://www.linear.com/product/LTC2364-18
27 http://www.linear.com/product/LTC2367-16
28 http://www.linear.com/product/LTC2367-18
29 http://www.linear.com/product/LTC2368-16
30 http://www.linear.com/product/LTC2368-18
31 http://www.linear.com/product/LTC2369-18
32 http://www.linear.com/product/LTC2370-16
33 
34 http://www.linear.com/product/LTC2364-16#demoboards
35 http://www.linear.com/product/LTC2364-18#demoboards
36 http://www.linear.com/product/LTC2367-16#demoboards
37 http://www.linear.com/product/LTC2367-18#demoboards
38 http://www.linear.com/product/LTC2368-16#demoboards
39 http://www.linear.com/product/LTC2368-18#demoboards
40 http://www.linear.com/product/LTC2369-18#demoboards
41 http://www.linear.com/product/LTC2370-16#demoboards
42 
43 
44 Copyright 2018(c) Analog Devices, Inc.
45 
46 All rights reserved.
47 
48 Redistribution and use in source and binary forms, with or without
49 modification, are permitted provided that the following conditions are met:
50  - Redistributions of source code must retain the above copyright
51  notice, this list of conditions and the following disclaimer.
52  - Redistributions in binary form must reproduce the above copyright
53  notice, this list of conditions and the following disclaimer in
54  the documentation and/or other materials provided with the
55  distribution.
56  - Neither the name of Analog Devices, Inc. nor the names of its
57  contributors may be used to endorse or promote products derived
58  from this software without specific prior written permission.
59  - The use of this software may or may not infringe the patent rights
60  of one or more patent holders. This license does not release you
61  from the requirement that you obtain separate licenses from these
62  patent holders to use this software.
63  - Use of the software either in source or binary form, must be run
64  on or directly connected to an Analog Devices Inc. component.
65 
66 THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
67 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
68 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
69 IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
70 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
71 LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
72 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
73 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
74 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
75 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
76 */
77 
78 //! @ingroup Analog_to_Digital_Converters
79 //! @{
80 //! @defgroup LTC2370 LTC2370: 16/18-Bit 1Msps ADC
81 //! @}
82 
83 /*! @file
84  @ingroup LTC2370
85  Library for LTC2370: 16/18-Bit 1Msps ADC
86 */
87 
88 #include <Arduino.h>
89 #include <stdint.h>
90 #include "Linduino.h"
91 #include "LT_SPI.h"
92 #include "LTC2370.h"
93 #include <SPI.h>
94 
95 
96 // Reads from a SPI LTC2370-XX device that has no configuration word and a 20 bit output word in offset binary format.
97 void LTC2370_read(uint8_t cs, uint32_t *ptr_adc_code)
98 {
99  LT_union_int16_2bytes command; // LTC2370 data and command
100  command.LT_uint16 = 0; // Set to zero, not necessary but avoids
101  // random data in scope shots.
102 
103 //Form a four byte object to hold four bytes of data
104  LT_union_int32_4bytes data; //instantiate the union
105  data.LT_byte[3] = 0;
106  data.LT_byte[2] = 0;
107  data.LT_byte[1] = 0;
108  data.LT_byte[0] = 0;
109 
110  spi_transfer_block(cs,command.LT_byte,data.LT_byte,4);
111 
112  *ptr_adc_code = data.LT_int32;
113 
114  return;
115 }
116 
117 
118 // Calculates the voltage corresponding to an adc code in offset binary, given the reference voltage (in volts)
119 float LTC2370_code_to_voltage(uint32_t adc_code, float vref)
120 {
121  float voltage;
122 
123  voltage = (float)adc_code;
124  voltage = voltage / (pow(2,32)-1); //! 2) This calculates the input as a fraction of the reference voltage (dimensionless)
125  voltage = voltage * vref; //! 3) Multiply fraction by Vref to get the actual voltage at the input (in volts)
126 
127  return(voltage);
128 }
void LTC2370_read(uint8_t cs, uint32_t *ptr_adc_code)
Reads the LTC2370 and returns 32-bit data in offset binary format.
Definition: LTC2370.cpp:97
uint8_t LT_byte[4]
4 bytes (unsigned 8-bit integers) to be converted to a 32-bit signed or unsigned integer ...
Definition: Linduino.h:112
Header File for Linduino Libraries and Demo Code.
union LT_union_int32_4bytes data
Definition: DC2094A.ino:138
uint16_t LT_uint16
16-bit unsigned integer to be converted to two bytes
Definition: Linduino.h:102
LTC2364-16: 16-Bit, 250Ksps ADC.
float LTC2370_code_to_voltage(uint32_t adc_code, float vref)
Calculates the LTC2370 input voltage given the binary data and lsb weight.
Definition: LTC2370.cpp:119
int32_t LT_int32
32-bit signed integer to be converted to four bytes
Definition: Linduino.h:110
LT_SPI: Routines to communicate with ATmega328P&#39;s hardware SPI port.
This union splits one int32_t (32-bit signed integer) or uint32_t (32-bit unsigned integer) four uint...
Definition: Linduino.h:108
This union splits one int16_t (16-bit signed integer) or uint16_t (16-bit unsigned integer) into two ...
Definition: Linduino.h:99
void spi_transfer_block(uint8_t cs_pin, uint8_t *tx, uint8_t *rx, uint8_t length)
Reads and sends a byte array.
Definition: LT_SPI.cpp:125
static float voltage
Definition: DC2289AA.ino:71
uint8_t LT_byte[2]
2 bytes (unsigned 8-bit integers) to be converted to a 16-bit signed or unsigned integer ...
Definition: Linduino.h:103
static uint32_t adc_code
Definition: DC2071AA.ino:113