16-Bit I/O Expander with Serial Interface (SPI)
Dependents: relaekort_til_motorstyring Nucleo_MCP23S17_Test BSM02 POT_V_1_1
MCP23S17.cpp@3:b2a44e1e54b8, 2016-01-20 (annotated)
- Committer:
- stjo2809
- Date:
- Wed Jan 20 10:49:02 2016 +0000
- Revision:
- 3:b2a44e1e54b8
- Parent:
- 2:b74bf9a31168
Version 2 (tested)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
stjo2809 | 2:b74bf9a31168 | 1 | /* mbed MCP23S17 Library, for driving the MCP23S17 16-Bit I/O Expander with Serial Interface (SPI) |
stjo2809 | 2:b74bf9a31168 | 2 | * Copyright (c) 2015, Created by Steen Joergensen (stjo2809) inspired by Romilly Cocking MCP23S17 library |
stjo2809 | 2:b74bf9a31168 | 3 | * |
stjo2809 | 2:b74bf9a31168 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
stjo2809 | 2:b74bf9a31168 | 5 | * of this software and associated documentation files (the "Software"), to deal |
stjo2809 | 2:b74bf9a31168 | 6 | * in the Software without restriction, including without limitation the rights |
stjo2809 | 2:b74bf9a31168 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
stjo2809 | 2:b74bf9a31168 | 8 | * copies of the Software, and to permit persons to whom the Software is |
stjo2809 | 2:b74bf9a31168 | 9 | * furnished to do so, subject to the following conditions: |
stjo2809 | 2:b74bf9a31168 | 10 | * |
stjo2809 | 2:b74bf9a31168 | 11 | * The above copyright notice and this permission notice shall be included in |
stjo2809 | 2:b74bf9a31168 | 12 | * all copies or substantial portions of the Software. |
stjo2809 | 2:b74bf9a31168 | 13 | * |
stjo2809 | 2:b74bf9a31168 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
stjo2809 | 2:b74bf9a31168 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
stjo2809 | 2:b74bf9a31168 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
stjo2809 | 2:b74bf9a31168 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
stjo2809 | 2:b74bf9a31168 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
stjo2809 | 2:b74bf9a31168 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
stjo2809 | 2:b74bf9a31168 | 20 | * THE SOFTWARE. |
stjo2809 | 2:b74bf9a31168 | 21 | */ |
stjo2809 | 2:b74bf9a31168 | 22 | |
stjo2809 | 2:b74bf9a31168 | 23 | #include "mbed.h" |
stjo2809 | 2:b74bf9a31168 | 24 | #include "MCP23S17.h" |
stjo2809 | 2:b74bf9a31168 | 25 | |
stjo2809 | 2:b74bf9a31168 | 26 | //============================================================================= |
stjo2809 | 2:b74bf9a31168 | 27 | // Public functions |
stjo2809 | 2:b74bf9a31168 | 28 | //============================================================================= |
stjo2809 | 2:b74bf9a31168 | 29 | |
stjo2809 | 2:b74bf9a31168 | 30 | MCP23S17::MCP23S17(int hardwareaddress, SPI& spi, PinName nCs, PinName nReset) : _hardwareaddress(hardwareaddress), _spi(spi), _nCs(nCs), _nReset(nReset) |
stjo2809 | 2:b74bf9a31168 | 31 | { |
stjo2809 | 2:b74bf9a31168 | 32 | _make_opcode(_hardwareaddress); |
stjo2809 | 2:b74bf9a31168 | 33 | _initialization(); |
stjo2809 | 2:b74bf9a31168 | 34 | } |
stjo2809 | 2:b74bf9a31168 | 35 | |
stjo2809 | 2:b74bf9a31168 | 36 | MCP23S17::MCP23S17(int hardwareaddress, SPI& spi, PinName nCs) : _hardwareaddress(hardwareaddress), _spi(spi), _nCs(nCs), _nReset(NC) // _nReset(NC) added for the compiler |
stjo2809 | 2:b74bf9a31168 | 37 | { |
stjo2809 | 2:b74bf9a31168 | 38 | _make_opcode(_hardwareaddress); |
stjo2809 | 2:b74bf9a31168 | 39 | _initialization(); |
stjo2809 | 2:b74bf9a31168 | 40 | } |
stjo2809 | 2:b74bf9a31168 | 41 | |
stjo2809 | 2:b74bf9a31168 | 42 | char MCP23S17::read(char reg_address) |
stjo2809 | 2:b74bf9a31168 | 43 | { |
stjo2809 | 2:b74bf9a31168 | 44 | return _read(reg_address); |
stjo2809 | 2:b74bf9a31168 | 45 | } |
stjo2809 | 2:b74bf9a31168 | 46 | |
stjo2809 | 2:b74bf9a31168 | 47 | void MCP23S17::write(char reg_address, char data) |
stjo2809 | 2:b74bf9a31168 | 48 | { |
stjo2809 | 2:b74bf9a31168 | 49 | _write(reg_address, data); |
stjo2809 | 2:b74bf9a31168 | 50 | } |
stjo2809 | 2:b74bf9a31168 | 51 | |
stjo2809 | 2:b74bf9a31168 | 52 | void MCP23S17::bit(char reg_address, int bitnumber, bool high_low) |
stjo2809 | 2:b74bf9a31168 | 53 | { |
stjo2809 | 2:b74bf9a31168 | 54 | char i; |
stjo2809 | 2:b74bf9a31168 | 55 | |
stjo2809 | 2:b74bf9a31168 | 56 | if(bitnumber >= 1 || bitnumber <= 8) |
stjo2809 | 2:b74bf9a31168 | 57 | { |
stjo2809 | 2:b74bf9a31168 | 58 | if(high_low == 1) |
stjo2809 | 2:b74bf9a31168 | 59 | { |
stjo2809 | 2:b74bf9a31168 | 60 | i = _read(reg_address); |
stjo2809 | 2:b74bf9a31168 | 61 | i = i | (0x01 << (bitnumber-1)); |
stjo2809 | 2:b74bf9a31168 | 62 | _write(reg_address, i); |
stjo2809 | 2:b74bf9a31168 | 63 | } |
stjo2809 | 2:b74bf9a31168 | 64 | if(high_low == 0) |
stjo2809 | 2:b74bf9a31168 | 65 | { |
stjo2809 | 2:b74bf9a31168 | 66 | i = _read(reg_address); |
stjo2809 | 2:b74bf9a31168 | 67 | i = i & ~(0x01 << (bitnumber-1)); |
stjo2809 | 2:b74bf9a31168 | 68 | _write(reg_address, i); |
stjo2809 | 2:b74bf9a31168 | 69 | } |
stjo2809 | 2:b74bf9a31168 | 70 | } |
stjo2809 | 2:b74bf9a31168 | 71 | } |
stjo2809 | 2:b74bf9a31168 | 72 | |
stjo2809 | 2:b74bf9a31168 | 73 | void MCP23S17::reset() |
stjo2809 | 2:b74bf9a31168 | 74 | { |
stjo2809 | 2:b74bf9a31168 | 75 | _nReset = 0; |
stjo2809 | 2:b74bf9a31168 | 76 | wait_us(5); |
stjo2809 | 2:b74bf9a31168 | 77 | _nReset = 1; |
stjo2809 | 2:b74bf9a31168 | 78 | _initialization(); |
stjo2809 | 2:b74bf9a31168 | 79 | } |
stjo2809 | 2:b74bf9a31168 | 80 | |
stjo2809 | 2:b74bf9a31168 | 81 | char MCP23S17::iodira() |
stjo2809 | 2:b74bf9a31168 | 82 | { |
stjo2809 | 2:b74bf9a31168 | 83 | return _read(IODIRA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 84 | } |
stjo2809 | 2:b74bf9a31168 | 85 | |
stjo2809 | 2:b74bf9a31168 | 86 | void MCP23S17::iodira(char data) |
stjo2809 | 2:b74bf9a31168 | 87 | { |
stjo2809 | 2:b74bf9a31168 | 88 | _write(IODIRA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 89 | } |
stjo2809 | 2:b74bf9a31168 | 90 | |
stjo2809 | 2:b74bf9a31168 | 91 | char MCP23S17::iodirb() |
stjo2809 | 2:b74bf9a31168 | 92 | { |
stjo2809 | 2:b74bf9a31168 | 93 | return _read(IODIRB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 94 | } |
stjo2809 | 2:b74bf9a31168 | 95 | |
stjo2809 | 2:b74bf9a31168 | 96 | void MCP23S17::iodirb(char data) |
stjo2809 | 2:b74bf9a31168 | 97 | { |
stjo2809 | 2:b74bf9a31168 | 98 | _write(IODIRB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 99 | } |
stjo2809 | 2:b74bf9a31168 | 100 | |
stjo2809 | 2:b74bf9a31168 | 101 | char MCP23S17::ipola() |
stjo2809 | 2:b74bf9a31168 | 102 | { |
stjo2809 | 2:b74bf9a31168 | 103 | return _read(IPOLA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 104 | } |
stjo2809 | 2:b74bf9a31168 | 105 | |
stjo2809 | 2:b74bf9a31168 | 106 | void MCP23S17::ipola(char data) |
stjo2809 | 2:b74bf9a31168 | 107 | { |
stjo2809 | 2:b74bf9a31168 | 108 | _write(IPOLA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 109 | } |
stjo2809 | 2:b74bf9a31168 | 110 | |
stjo2809 | 2:b74bf9a31168 | 111 | char MCP23S17::ipolb() |
stjo2809 | 2:b74bf9a31168 | 112 | { |
stjo2809 | 2:b74bf9a31168 | 113 | return _read(IPOLB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 114 | } |
stjo2809 | 2:b74bf9a31168 | 115 | |
stjo2809 | 2:b74bf9a31168 | 116 | void MCP23S17::ipolb(char data) |
stjo2809 | 2:b74bf9a31168 | 117 | { |
stjo2809 | 2:b74bf9a31168 | 118 | _write(IPOLB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 119 | } |
stjo2809 | 2:b74bf9a31168 | 120 | |
stjo2809 | 2:b74bf9a31168 | 121 | char MCP23S17::gpintena() |
stjo2809 | 2:b74bf9a31168 | 122 | { |
stjo2809 | 2:b74bf9a31168 | 123 | return _read(GPINTENA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 124 | } |
stjo2809 | 2:b74bf9a31168 | 125 | |
stjo2809 | 2:b74bf9a31168 | 126 | void MCP23S17::gpintena(char data) |
stjo2809 | 2:b74bf9a31168 | 127 | { |
stjo2809 | 2:b74bf9a31168 | 128 | _write(GPINTENA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 129 | } |
stjo2809 | 2:b74bf9a31168 | 130 | |
stjo2809 | 2:b74bf9a31168 | 131 | char MCP23S17::gpintenb() |
stjo2809 | 2:b74bf9a31168 | 132 | { |
stjo2809 | 2:b74bf9a31168 | 133 | return _read(GPINTENB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 134 | } |
stjo2809 | 2:b74bf9a31168 | 135 | |
stjo2809 | 2:b74bf9a31168 | 136 | void MCP23S17::gpintenb(char data) |
stjo2809 | 2:b74bf9a31168 | 137 | { |
stjo2809 | 2:b74bf9a31168 | 138 | _write(GPINTENB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 139 | } |
stjo2809 | 2:b74bf9a31168 | 140 | |
stjo2809 | 2:b74bf9a31168 | 141 | char MCP23S17::defvala() |
stjo2809 | 2:b74bf9a31168 | 142 | { |
stjo2809 | 2:b74bf9a31168 | 143 | return _read(DEFVALA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 144 | } |
stjo2809 | 2:b74bf9a31168 | 145 | |
stjo2809 | 2:b74bf9a31168 | 146 | void MCP23S17::defvala(char data) |
stjo2809 | 2:b74bf9a31168 | 147 | { |
stjo2809 | 2:b74bf9a31168 | 148 | _write(DEFVALA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 149 | } |
stjo2809 | 2:b74bf9a31168 | 150 | |
stjo2809 | 2:b74bf9a31168 | 151 | char MCP23S17::defvalb() |
stjo2809 | 2:b74bf9a31168 | 152 | { |
stjo2809 | 2:b74bf9a31168 | 153 | return _read(DEFVALB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 154 | } |
stjo2809 | 2:b74bf9a31168 | 155 | |
stjo2809 | 2:b74bf9a31168 | 156 | void MCP23S17::defvalb(char data) |
stjo2809 | 2:b74bf9a31168 | 157 | { |
stjo2809 | 2:b74bf9a31168 | 158 | _write(DEFVALB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 159 | } |
stjo2809 | 2:b74bf9a31168 | 160 | |
stjo2809 | 2:b74bf9a31168 | 161 | char MCP23S17::intcona() |
stjo2809 | 2:b74bf9a31168 | 162 | { |
stjo2809 | 2:b74bf9a31168 | 163 | return _read(INTCONA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 164 | } |
stjo2809 | 2:b74bf9a31168 | 165 | |
stjo2809 | 2:b74bf9a31168 | 166 | void MCP23S17::intcona(char data) |
stjo2809 | 2:b74bf9a31168 | 167 | { |
stjo2809 | 2:b74bf9a31168 | 168 | _write(INTCONA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 169 | } |
stjo2809 | 2:b74bf9a31168 | 170 | |
stjo2809 | 2:b74bf9a31168 | 171 | char MCP23S17::intconb() |
stjo2809 | 2:b74bf9a31168 | 172 | { |
stjo2809 | 2:b74bf9a31168 | 173 | return _read(INTCONB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 174 | } |
stjo2809 | 2:b74bf9a31168 | 175 | |
stjo2809 | 2:b74bf9a31168 | 176 | void MCP23S17::intconb(char data) |
stjo2809 | 2:b74bf9a31168 | 177 | { |
stjo2809 | 2:b74bf9a31168 | 178 | _write(INTCONB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 179 | } |
stjo2809 | 2:b74bf9a31168 | 180 | |
stjo2809 | 2:b74bf9a31168 | 181 | char MCP23S17::iocon() |
stjo2809 | 2:b74bf9a31168 | 182 | { |
stjo2809 | 2:b74bf9a31168 | 183 | return _read(IOCON_ADDR); |
stjo2809 | 2:b74bf9a31168 | 184 | } |
stjo2809 | 2:b74bf9a31168 | 185 | |
stjo2809 | 2:b74bf9a31168 | 186 | void MCP23S17::iocon(char data) |
stjo2809 | 2:b74bf9a31168 | 187 | { |
stjo2809 | 2:b74bf9a31168 | 188 | _write(IOCON_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 189 | } |
stjo2809 | 2:b74bf9a31168 | 190 | |
stjo2809 | 2:b74bf9a31168 | 191 | char MCP23S17::gppua() |
stjo2809 | 2:b74bf9a31168 | 192 | { |
stjo2809 | 2:b74bf9a31168 | 193 | return _read(GPPUA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 194 | } |
stjo2809 | 2:b74bf9a31168 | 195 | |
stjo2809 | 2:b74bf9a31168 | 196 | void MCP23S17::gppua(char data) |
stjo2809 | 2:b74bf9a31168 | 197 | { |
stjo2809 | 2:b74bf9a31168 | 198 | _write(GPPUA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 199 | } |
stjo2809 | 2:b74bf9a31168 | 200 | |
stjo2809 | 2:b74bf9a31168 | 201 | char MCP23S17::gppub() |
stjo2809 | 2:b74bf9a31168 | 202 | { |
stjo2809 | 2:b74bf9a31168 | 203 | return _read(GPPUB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 204 | } |
stjo2809 | 2:b74bf9a31168 | 205 | |
stjo2809 | 2:b74bf9a31168 | 206 | void MCP23S17::gppub(char data) |
stjo2809 | 2:b74bf9a31168 | 207 | { |
stjo2809 | 2:b74bf9a31168 | 208 | _write(GPPUB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 209 | } |
stjo2809 | 2:b74bf9a31168 | 210 | |
stjo2809 | 2:b74bf9a31168 | 211 | char MCP23S17::intfa() |
stjo2809 | 2:b74bf9a31168 | 212 | { |
stjo2809 | 2:b74bf9a31168 | 213 | return _read(INTFA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 214 | } |
stjo2809 | 2:b74bf9a31168 | 215 | |
stjo2809 | 2:b74bf9a31168 | 216 | char MCP23S17::intfb() |
stjo2809 | 2:b74bf9a31168 | 217 | { |
stjo2809 | 2:b74bf9a31168 | 218 | return _read(INTFB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 219 | } |
stjo2809 | 2:b74bf9a31168 | 220 | |
stjo2809 | 2:b74bf9a31168 | 221 | char MCP23S17::intcapa() |
stjo2809 | 2:b74bf9a31168 | 222 | { |
stjo2809 | 2:b74bf9a31168 | 223 | return _read(INTCAPA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 224 | } |
stjo2809 | 2:b74bf9a31168 | 225 | |
stjo2809 | 2:b74bf9a31168 | 226 | char MCP23S17::intcapb() |
stjo2809 | 2:b74bf9a31168 | 227 | { |
stjo2809 | 2:b74bf9a31168 | 228 | return _read(INTCAPB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 229 | } |
stjo2809 | 2:b74bf9a31168 | 230 | |
stjo2809 | 2:b74bf9a31168 | 231 | char MCP23S17::gpioa() |
stjo2809 | 2:b74bf9a31168 | 232 | { |
stjo2809 | 2:b74bf9a31168 | 233 | return _read(GPIOA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 234 | } |
stjo2809 | 2:b74bf9a31168 | 235 | |
stjo2809 | 2:b74bf9a31168 | 236 | void MCP23S17::gpioa(char data) |
stjo2809 | 2:b74bf9a31168 | 237 | { |
stjo2809 | 2:b74bf9a31168 | 238 | _write(GPIOA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 239 | } |
stjo2809 | 2:b74bf9a31168 | 240 | |
stjo2809 | 2:b74bf9a31168 | 241 | char MCP23S17::gpiob() |
stjo2809 | 2:b74bf9a31168 | 242 | { |
stjo2809 | 2:b74bf9a31168 | 243 | return _read(GPIOB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 244 | } |
stjo2809 | 2:b74bf9a31168 | 245 | |
stjo2809 | 2:b74bf9a31168 | 246 | void MCP23S17::gpiob(char data) |
stjo2809 | 2:b74bf9a31168 | 247 | { |
stjo2809 | 2:b74bf9a31168 | 248 | _write(GPIOB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 249 | } |
stjo2809 | 2:b74bf9a31168 | 250 | |
stjo2809 | 2:b74bf9a31168 | 251 | char MCP23S17::olata() |
stjo2809 | 2:b74bf9a31168 | 252 | { |
stjo2809 | 2:b74bf9a31168 | 253 | return _read(OLATA_ADDR); |
stjo2809 | 2:b74bf9a31168 | 254 | } |
stjo2809 | 2:b74bf9a31168 | 255 | |
stjo2809 | 2:b74bf9a31168 | 256 | void MCP23S17::olata(char data) |
stjo2809 | 2:b74bf9a31168 | 257 | { |
stjo2809 | 2:b74bf9a31168 | 258 | _write(OLATA_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 259 | } |
stjo2809 | 2:b74bf9a31168 | 260 | |
stjo2809 | 2:b74bf9a31168 | 261 | char MCP23S17::olatb() |
stjo2809 | 2:b74bf9a31168 | 262 | { |
stjo2809 | 2:b74bf9a31168 | 263 | return _read(OLATB_ADDR); |
stjo2809 | 2:b74bf9a31168 | 264 | } |
stjo2809 | 2:b74bf9a31168 | 265 | |
stjo2809 | 2:b74bf9a31168 | 266 | void MCP23S17::olatb(char data) |
stjo2809 | 2:b74bf9a31168 | 267 | { |
stjo2809 | 2:b74bf9a31168 | 268 | _write(OLATB_ADDR, data); |
stjo2809 | 2:b74bf9a31168 | 269 | } |
stjo2809 | 2:b74bf9a31168 | 270 | |
stjo2809 | 2:b74bf9a31168 | 271 | void MCP23S17::intmirror(bool mirror) |
stjo2809 | 2:b74bf9a31168 | 272 | { |
stjo2809 | 2:b74bf9a31168 | 273 | char kopi_iocon = _read(IOCON_ADDR); |
stjo2809 | 2:b74bf9a31168 | 274 | if (mirror) |
stjo2809 | 2:b74bf9a31168 | 275 | { |
stjo2809 | 2:b74bf9a31168 | 276 | kopi_iocon = kopi_iocon | INTERRUPT_MIRROR_BIT; |
stjo2809 | 2:b74bf9a31168 | 277 | } |
stjo2809 | 2:b74bf9a31168 | 278 | else |
stjo2809 | 2:b74bf9a31168 | 279 | { |
stjo2809 | 2:b74bf9a31168 | 280 | kopi_iocon = kopi_iocon & ~INTERRUPT_MIRROR_BIT; |
stjo2809 | 2:b74bf9a31168 | 281 | } |
stjo2809 | 2:b74bf9a31168 | 282 | _write(IOCON_ADDR, kopi_iocon); |
stjo2809 | 2:b74bf9a31168 | 283 | } |
stjo2809 | 2:b74bf9a31168 | 284 | |
stjo2809 | 2:b74bf9a31168 | 285 | void MCP23S17::intpol(bool polarity) |
stjo2809 | 2:b74bf9a31168 | 286 | { |
stjo2809 | 2:b74bf9a31168 | 287 | char kopi_iocon = _read(IOCON_ADDR); |
stjo2809 | 2:b74bf9a31168 | 288 | if (polarity == false) |
stjo2809 | 2:b74bf9a31168 | 289 | { |
stjo2809 | 2:b74bf9a31168 | 290 | kopi_iocon = kopi_iocon | INTERRUPT_POLARITY_BIT; |
stjo2809 | 2:b74bf9a31168 | 291 | } |
stjo2809 | 2:b74bf9a31168 | 292 | else |
stjo2809 | 2:b74bf9a31168 | 293 | { |
stjo2809 | 2:b74bf9a31168 | 294 | kopi_iocon = kopi_iocon & ~INTERRUPT_POLARITY_BIT; |
stjo2809 | 2:b74bf9a31168 | 295 | } |
stjo2809 | 2:b74bf9a31168 | 296 | _write(IOCON_ADDR, kopi_iocon); |
stjo2809 | 2:b74bf9a31168 | 297 | } |
stjo2809 | 2:b74bf9a31168 | 298 | |
stjo2809 | 2:b74bf9a31168 | 299 | //============================================================================= |
stjo2809 | 2:b74bf9a31168 | 300 | // Private functions |
stjo2809 | 2:b74bf9a31168 | 301 | //============================================================================= |
stjo2809 | 2:b74bf9a31168 | 302 | |
stjo2809 | 2:b74bf9a31168 | 303 | void MCP23S17::_initialization() |
stjo2809 | 2:b74bf9a31168 | 304 | { |
stjo2809 | 2:b74bf9a31168 | 305 | _write(IOCON_ADDR, 0x2A); // setup af control register (BANK = 0, MIRROR = 0, SEQOP = 1, DISSLW = 0, HAEN = 1, ODR = 0, INTPOL = 1, NC = 0) |
stjo2809 | 3:b2a44e1e54b8 | 306 | _nCs = 1; |
stjo2809 | 2:b74bf9a31168 | 307 | } |
stjo2809 | 2:b74bf9a31168 | 308 | |
stjo2809 | 2:b74bf9a31168 | 309 | void MCP23S17::_make_opcode(int _hardwareaddress) |
stjo2809 | 2:b74bf9a31168 | 310 | { |
stjo2809 | 2:b74bf9a31168 | 311 | switch(_hardwareaddress) |
stjo2809 | 2:b74bf9a31168 | 312 | { |
stjo2809 | 2:b74bf9a31168 | 313 | case 0: |
stjo2809 | 2:b74bf9a31168 | 314 | _writeopcode = 0x40; |
stjo2809 | 2:b74bf9a31168 | 315 | _readopcode = 0x41; |
stjo2809 | 2:b74bf9a31168 | 316 | break; |
stjo2809 | 2:b74bf9a31168 | 317 | |
stjo2809 | 2:b74bf9a31168 | 318 | case 1: |
stjo2809 | 2:b74bf9a31168 | 319 | _writeopcode = 0x42; |
stjo2809 | 2:b74bf9a31168 | 320 | _readopcode = 0x43; |
stjo2809 | 2:b74bf9a31168 | 321 | break; |
stjo2809 | 2:b74bf9a31168 | 322 | |
stjo2809 | 2:b74bf9a31168 | 323 | case 2: |
stjo2809 | 2:b74bf9a31168 | 324 | _writeopcode = 0x44; |
stjo2809 | 2:b74bf9a31168 | 325 | _readopcode = 0x45; |
stjo2809 | 2:b74bf9a31168 | 326 | break; |
stjo2809 | 2:b74bf9a31168 | 327 | |
stjo2809 | 2:b74bf9a31168 | 328 | case 3: |
stjo2809 | 2:b74bf9a31168 | 329 | _writeopcode = 0x46; |
stjo2809 | 2:b74bf9a31168 | 330 | _readopcode = 0x47; |
stjo2809 | 2:b74bf9a31168 | 331 | break; |
stjo2809 | 2:b74bf9a31168 | 332 | |
stjo2809 | 2:b74bf9a31168 | 333 | case 4: |
stjo2809 | 2:b74bf9a31168 | 334 | _writeopcode = 0x48; |
stjo2809 | 2:b74bf9a31168 | 335 | _readopcode = 0x49; |
stjo2809 | 2:b74bf9a31168 | 336 | break; |
stjo2809 | 2:b74bf9a31168 | 337 | |
stjo2809 | 2:b74bf9a31168 | 338 | case 5: |
stjo2809 | 2:b74bf9a31168 | 339 | _writeopcode = 0x4A; |
stjo2809 | 2:b74bf9a31168 | 340 | _readopcode = 0x4B; |
stjo2809 | 2:b74bf9a31168 | 341 | break; |
stjo2809 | 2:b74bf9a31168 | 342 | |
stjo2809 | 2:b74bf9a31168 | 343 | case 6: |
stjo2809 | 2:b74bf9a31168 | 344 | _writeopcode = 0x4C; |
stjo2809 | 2:b74bf9a31168 | 345 | _readopcode = 0x4D; |
stjo2809 | 2:b74bf9a31168 | 346 | break; |
stjo2809 | 2:b74bf9a31168 | 347 | |
stjo2809 | 2:b74bf9a31168 | 348 | case 7: |
stjo2809 | 2:b74bf9a31168 | 349 | _writeopcode = 0x4E; |
stjo2809 | 2:b74bf9a31168 | 350 | _readopcode = 0x4F; |
stjo2809 | 2:b74bf9a31168 | 351 | break; |
stjo2809 | 2:b74bf9a31168 | 352 | } |
stjo2809 | 2:b74bf9a31168 | 353 | } |
stjo2809 | 2:b74bf9a31168 | 354 | |
stjo2809 | 2:b74bf9a31168 | 355 | char MCP23S17::_read(char address) |
stjo2809 | 2:b74bf9a31168 | 356 | { |
stjo2809 | 2:b74bf9a31168 | 357 | _nCs = 0; |
stjo2809 | 2:b74bf9a31168 | 358 | _spi.write(_readopcode); |
stjo2809 | 2:b74bf9a31168 | 359 | _spi.write(address); |
stjo2809 | 2:b74bf9a31168 | 360 | char response = _spi.write(0xFF); // 0xFF data to get response |
stjo2809 | 2:b74bf9a31168 | 361 | _nCs = 1; |
stjo2809 | 2:b74bf9a31168 | 362 | return response; |
stjo2809 | 2:b74bf9a31168 | 363 | } |
stjo2809 | 2:b74bf9a31168 | 364 | |
stjo2809 | 2:b74bf9a31168 | 365 | void MCP23S17::_write(char address, char data) |
stjo2809 | 2:b74bf9a31168 | 366 | { |
stjo2809 | 2:b74bf9a31168 | 367 | _nCs = 0; |
stjo2809 | 2:b74bf9a31168 | 368 | _spi.write(_writeopcode); |
stjo2809 | 2:b74bf9a31168 | 369 | _spi.write(address); |
stjo2809 | 2:b74bf9a31168 | 370 | _spi.write(data); |
stjo2809 | 2:b74bf9a31168 | 371 | _nCs = 1; |
stjo2809 | 2:b74bf9a31168 | 372 | } |
stjo2809 | 2:b74bf9a31168 | 373 |