mods
MCP4822.cpp@1:f3de66b30fc3, 2021-02-25 (annotated)
- Committer:
- kanope_benny
- Date:
- Thu Feb 25 12:18:14 2021 +0000
- Revision:
- 1:f3de66b30fc3
- Parent:
- 0:929babff65b1
mods
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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stjo2809 | 0:929babff65b1 | 1 | /* mbed MCP4822 Library, for driving the 12-Bit DAC with internal Vref and SPI interface |
stjo2809 | 0:929babff65b1 | 2 | * Copyright (c) 2015, Created by Steen Joergensen (stjo2809) |
stjo2809 | 0:929babff65b1 | 3 | * |
stjo2809 | 0:929babff65b1 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
stjo2809 | 0:929babff65b1 | 5 | * of this software and associated documentation files (the "Software"), to deal |
stjo2809 | 0:929babff65b1 | 6 | * in the Software without restriction, including without limitation the rights |
stjo2809 | 0:929babff65b1 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
stjo2809 | 0:929babff65b1 | 8 | * copies of the Software, and to permit persons to whom the Software is |
stjo2809 | 0:929babff65b1 | 9 | * furnished to do so, subject to the following conditions: |
stjo2809 | 0:929babff65b1 | 10 | * |
stjo2809 | 0:929babff65b1 | 11 | * The above copyright notice and this permission notice shall be included in |
stjo2809 | 0:929babff65b1 | 12 | * all copies or substantial portions of the Software. |
stjo2809 | 0:929babff65b1 | 13 | * |
stjo2809 | 0:929babff65b1 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
stjo2809 | 0:929babff65b1 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
stjo2809 | 0:929babff65b1 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
stjo2809 | 0:929babff65b1 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
stjo2809 | 0:929babff65b1 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
stjo2809 | 0:929babff65b1 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
stjo2809 | 0:929babff65b1 | 20 | * THE SOFTWARE. |
stjo2809 | 0:929babff65b1 | 21 | */ |
stjo2809 | 0:929babff65b1 | 22 | |
stjo2809 | 0:929babff65b1 | 23 | #include "mbed.h" |
stjo2809 | 0:929babff65b1 | 24 | #include "MCP4822.h" |
stjo2809 | 0:929babff65b1 | 25 | |
stjo2809 | 0:929babff65b1 | 26 | //============================================================================= |
stjo2809 | 0:929babff65b1 | 27 | // Public functions |
stjo2809 | 0:929babff65b1 | 28 | //============================================================================= |
stjo2809 | 0:929babff65b1 | 29 | |
stjo2809 | 0:929babff65b1 | 30 | MCP4822::MCP4822(SPI& spi, PinName nLDAC, PinName nCs) : _spi(spi), _nLDAC(nLDAC), _nCs(nCs) |
stjo2809 | 0:929babff65b1 | 31 | { |
stjo2809 | 0:929babff65b1 | 32 | |
stjo2809 | 0:929babff65b1 | 33 | } |
stjo2809 | 0:929babff65b1 | 34 | |
kanope_benny | 1:f3de66b30fc3 | 35 | /* |
stjo2809 | 0:929babff65b1 | 36 | MCP4822::MCP4822(PinName nLDAC, PinName mosi, PinName miso,PinName sck, PinName nCs) : _nLDAC(nLDAC), _mosi(mosi), _miso(miso), _sck(sck), _nCs(nCs) |
stjo2809 | 0:929babff65b1 | 37 | { |
stjo2809 | 0:929babff65b1 | 38 | SPI _spi(_mosi,_miso,_sck); |
stjo2809 | 0:929babff65b1 | 39 | } |
kanope_benny | 1:f3de66b30fc3 | 40 | */ |
stjo2809 | 0:929babff65b1 | 41 | void MCP4822::a(bool gain, int data) |
stjo2809 | 0:929babff65b1 | 42 | { |
stjo2809 | 0:929babff65b1 | 43 | _write(0, gain, 1, data); |
stjo2809 | 0:929babff65b1 | 44 | } |
stjo2809 | 0:929babff65b1 | 45 | |
stjo2809 | 0:929babff65b1 | 46 | void MCP4822::b(bool gain, int data) |
stjo2809 | 0:929babff65b1 | 47 | { |
stjo2809 | 0:929babff65b1 | 48 | _write(1, gain, 1, data); |
stjo2809 | 0:929babff65b1 | 49 | } |
stjo2809 | 0:929babff65b1 | 50 | |
stjo2809 | 0:929babff65b1 | 51 | void MCP4822::ldac(bool act) |
stjo2809 | 0:929babff65b1 | 52 | { |
stjo2809 | 0:929babff65b1 | 53 | _nLDAC = ~act; |
stjo2809 | 0:929babff65b1 | 54 | } |
stjo2809 | 0:929babff65b1 | 55 | |
stjo2809 | 0:929babff65b1 | 56 | void MCP4822::shdn(bool output, bool act) |
stjo2809 | 0:929babff65b1 | 57 | { |
stjo2809 | 0:929babff65b1 | 58 | _write(output, 1, ~act, 0x00); |
stjo2809 | 0:929babff65b1 | 59 | } |
stjo2809 | 0:929babff65b1 | 60 | |
stjo2809 | 0:929babff65b1 | 61 | //============================================================================= |
stjo2809 | 0:929babff65b1 | 62 | // Private functions |
stjo2809 | 0:929babff65b1 | 63 | //============================================================================= |
stjo2809 | 0:929babff65b1 | 64 | |
stjo2809 | 0:929babff65b1 | 65 | char MCP4822::_make_upper_half(bool output, bool gain, bool shdn, int data) |
stjo2809 | 0:929babff65b1 | 66 | { |
stjo2809 | 0:929babff65b1 | 67 | char responce = 0; |
stjo2809 | 0:929babff65b1 | 68 | |
stjo2809 | 0:929babff65b1 | 69 | if(output == '0') |
stjo2809 | 0:929babff65b1 | 70 | { |
stjo2809 | 0:929babff65b1 | 71 | responce = responce | CB_OUTPUT_A; |
stjo2809 | 0:929babff65b1 | 72 | } |
stjo2809 | 0:929babff65b1 | 73 | else |
stjo2809 | 0:929babff65b1 | 74 | { |
stjo2809 | 0:929babff65b1 | 75 | responce = responce | CB_OUTPUT_B; |
stjo2809 | 0:929babff65b1 | 76 | } |
stjo2809 | 0:929babff65b1 | 77 | |
stjo2809 | 0:929babff65b1 | 78 | if(gain == '0') |
stjo2809 | 0:929babff65b1 | 79 | { |
stjo2809 | 0:929babff65b1 | 80 | responce = responce | CB_GAIN_2X; |
stjo2809 | 0:929babff65b1 | 81 | } |
stjo2809 | 0:929babff65b1 | 82 | else |
stjo2809 | 0:929babff65b1 | 83 | { |
stjo2809 | 0:929babff65b1 | 84 | responce = responce | CB_GAIN_1X; |
stjo2809 | 0:929babff65b1 | 85 | } |
stjo2809 | 0:929babff65b1 | 86 | |
stjo2809 | 0:929babff65b1 | 87 | if(shdn == '0') |
stjo2809 | 0:929babff65b1 | 88 | { |
stjo2809 | 0:929babff65b1 | 89 | responce = responce | CB_NSHDN; |
stjo2809 | 0:929babff65b1 | 90 | } |
stjo2809 | 0:929babff65b1 | 91 | else |
stjo2809 | 0:929babff65b1 | 92 | { |
stjo2809 | 0:929babff65b1 | 93 | responce = responce | CB_SHDN; |
stjo2809 | 0:929babff65b1 | 94 | } |
stjo2809 | 0:929babff65b1 | 95 | |
stjo2809 | 0:929babff65b1 | 96 | if(data > 0xff && data < 0xfff) |
stjo2809 | 0:929babff65b1 | 97 | { |
stjo2809 | 0:929babff65b1 | 98 | responce = responce | (data >> 8); |
stjo2809 | 0:929babff65b1 | 99 | } |
stjo2809 | 0:929babff65b1 | 100 | |
stjo2809 | 0:929babff65b1 | 101 | return responce; |
stjo2809 | 0:929babff65b1 | 102 | } |
stjo2809 | 0:929babff65b1 | 103 | |
stjo2809 | 0:929babff65b1 | 104 | char MCP4822::_make_lower_half(int data) |
stjo2809 | 0:929babff65b1 | 105 | { |
stjo2809 | 0:929babff65b1 | 106 | return (data & 0xff); |
stjo2809 | 0:929babff65b1 | 107 | } |
stjo2809 | 0:929babff65b1 | 108 | |
stjo2809 | 0:929babff65b1 | 109 | void MCP4822::_write(bool output, bool gain, bool shdn, int data) |
stjo2809 | 0:929babff65b1 | 110 | { |
stjo2809 | 0:929babff65b1 | 111 | |
stjo2809 | 0:929babff65b1 | 112 | _upper_half = _make_upper_half(output, gain, shdn, data); |
stjo2809 | 0:929babff65b1 | 113 | _lower_half = _make_lower_half(data); |
stjo2809 | 0:929babff65b1 | 114 | |
stjo2809 | 0:929babff65b1 | 115 | _nCs = 0; |
stjo2809 | 0:929babff65b1 | 116 | _spi.write(_upper_half); |
stjo2809 | 0:929babff65b1 | 117 | _spi.write(_lower_half); |
stjo2809 | 0:929babff65b1 | 118 | _nCs = 1; |
stjo2809 | 0:929babff65b1 | 119 | } |