Library for MAX7300 GPIO Expander
max7300.cpp@4:4ffbd5539b69, 2015-07-24 (annotated)
- Committer:
- j3
- Date:
- Fri Jul 24 01:54:41 2015 +0000
- Revision:
- 4:4ffbd5539b69
- Parent:
- 3:e044960e516c
- Child:
- 5:c4d2978bdebb
fixed comments
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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j3 | 0:350a850a7191 | 1 | /******************************************************************//** |
j3 | 4:4ffbd5539b69 | 2 | * @file max7300.cpp |
j3 | 0:350a850a7191 | 3 | * |
j3 | 0:350a850a7191 | 4 | * @author Justin Jordan |
j3 | 0:350a850a7191 | 5 | * |
j3 | 0:350a850a7191 | 6 | * @version 0.0 |
j3 | 0:350a850a7191 | 7 | * |
j3 | 0:350a850a7191 | 8 | * Started: 14JUL15 |
j3 | 0:350a850a7191 | 9 | * |
j3 | 0:350a850a7191 | 10 | * Updated: |
j3 | 0:350a850a7191 | 11 | * |
j3 | 0:350a850a7191 | 12 | * @brief Source file for Max7300 class |
j3 | 0:350a850a7191 | 13 | *********************************************************************** |
j3 | 0:350a850a7191 | 14 | * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved. |
j3 | 0:350a850a7191 | 15 | * |
j3 | 0:350a850a7191 | 16 | * Permission is hereby granted, free of charge, to any person obtaining a |
j3 | 0:350a850a7191 | 17 | * copy of this software and associated documentation files (the "Software"), |
j3 | 0:350a850a7191 | 18 | * to deal in the Software without restriction, including without limitation |
j3 | 0:350a850a7191 | 19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
j3 | 0:350a850a7191 | 20 | * and/or sell copies of the Software, and to permit persons to whom the |
j3 | 0:350a850a7191 | 21 | * Software is furnished to do so, subject to the following conditions: |
j3 | 0:350a850a7191 | 22 | * |
j3 | 0:350a850a7191 | 23 | * The above copyright notice and this permission notice shall be included |
j3 | 0:350a850a7191 | 24 | * in all copies or substantial portions of the Software. |
j3 | 0:350a850a7191 | 25 | * |
j3 | 0:350a850a7191 | 26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
j3 | 0:350a850a7191 | 27 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
j3 | 0:350a850a7191 | 28 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
j3 | 0:350a850a7191 | 29 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
j3 | 0:350a850a7191 | 30 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
j3 | 0:350a850a7191 | 31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
j3 | 0:350a850a7191 | 32 | * OTHER DEALINGS IN THE SOFTWARE. |
j3 | 0:350a850a7191 | 33 | * |
j3 | 0:350a850a7191 | 34 | * Except as contained in this notice, the name of Maxim Integrated |
j3 | 0:350a850a7191 | 35 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
j3 | 0:350a850a7191 | 36 | * Products, Inc. Branding Policy. |
j3 | 0:350a850a7191 | 37 | * |
j3 | 0:350a850a7191 | 38 | * The mere transfer of this software does not imply any licenses |
j3 | 0:350a850a7191 | 39 | * of trade secrets, proprietary technology, copyrights, patents, |
j3 | 0:350a850a7191 | 40 | * trademarks, maskwork rights, or any other form of intellectual |
j3 | 0:350a850a7191 | 41 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
j3 | 0:350a850a7191 | 42 | * ownership rights. |
j3 | 0:350a850a7191 | 43 | **********************************************************************/ |
j3 | 0:350a850a7191 | 44 | |
j3 | 0:350a850a7191 | 45 | |
j3 | 0:350a850a7191 | 46 | #include "max7300.h" |
j3 | 0:350a850a7191 | 47 | |
j3 | 0:350a850a7191 | 48 | |
j3 | 1:e1ee2549a047 | 49 | //configuration register bits |
j3 | 3:e044960e516c | 50 | #define MAX7300_S_BIT (0x01) |
j3 | 3:e044960e516c | 51 | #define MAX7300_M_BIT (0x80) |
j3 | 1:e1ee2549a047 | 52 | |
j3 | 1:e1ee2549a047 | 53 | //registers |
j3 | 3:e044960e516c | 54 | #define MAX7300_CONFIGURATION (0x04) |
j3 | 3:e044960e516c | 55 | #define MAX7300_TRANSITION_DETECT_MASK (0x06) |
j3 | 3:e044960e516c | 56 | #define MAX7300_PORT_CONFIGURATION (0x09) |
j3 | 3:e044960e516c | 57 | #define MAX7300_PORT_ONLY_BASE_ADRS (0x20) |
j3 | 1:e1ee2549a047 | 58 | |
j3 | 1:e1ee2549a047 | 59 | //helper for calclating register addresses in 8 port wide fxs |
j3 | 3:e044960e516c | 60 | #define MAX7300_8_PORTS_OFFSET (0x40) |
j3 | 1:e1ee2549a047 | 61 | |
j3 | 1:e1ee2549a047 | 62 | |
j3 | 0:350a850a7191 | 63 | //********************************************************************* |
j3 | 0:350a850a7191 | 64 | Max7300::Max7300(I2C *i2c_bus, max7300_i2c_adrs_t i2c_adrs): _p_i2c(i2c_bus) |
j3 | 0:350a850a7191 | 65 | { |
j3 | 0:350a850a7191 | 66 | _i2c_owner = false; |
j3 | 0:350a850a7191 | 67 | |
j3 | 0:350a850a7191 | 68 | _r_adrs = ((i2c_adrs << 1) | 1); |
j3 | 0:350a850a7191 | 69 | _w_adrs = (i2c_adrs << 1); |
j3 | 0:350a850a7191 | 70 | } |
j3 | 0:350a850a7191 | 71 | |
j3 | 0:350a850a7191 | 72 | |
j3 | 0:350a850a7191 | 73 | //********************************************************************* |
j3 | 0:350a850a7191 | 74 | Max7300::Max7300(PinName sda, PinName scl, max7300_i2c_adrs_t i2c_adrs) |
j3 | 0:350a850a7191 | 75 | { |
j3 | 0:350a850a7191 | 76 | _p_i2c = new I2C(sda, scl); |
j3 | 0:350a850a7191 | 77 | _i2c_owner = true; |
j3 | 0:350a850a7191 | 78 | |
j3 | 0:350a850a7191 | 79 | _r_adrs = ((i2c_adrs << 1) | 1); |
j3 | 0:350a850a7191 | 80 | _w_adrs = (i2c_adrs << 1); |
j3 | 0:350a850a7191 | 81 | } |
j3 | 0:350a850a7191 | 82 | |
j3 | 0:350a850a7191 | 83 | |
j3 | 0:350a850a7191 | 84 | //********************************************************************* |
j3 | 0:350a850a7191 | 85 | Max7300::~Max7300() |
j3 | 0:350a850a7191 | 86 | { |
j3 | 0:350a850a7191 | 87 | if(_i2c_owner) |
j3 | 0:350a850a7191 | 88 | { |
j3 | 0:350a850a7191 | 89 | delete _p_i2c; |
j3 | 0:350a850a7191 | 90 | } |
j3 | 0:350a850a7191 | 91 | } |
j3 | 0:350a850a7191 | 92 | |
j3 | 0:350a850a7191 | 93 | |
j3 | 0:350a850a7191 | 94 | //********************************************************************* |
j3 | 0:350a850a7191 | 95 | int16_t Max7300::enable_ports(void) |
j3 | 0:350a850a7191 | 96 | { |
j3 | 0:350a850a7191 | 97 | int16_t result = -1; |
j3 | 0:350a850a7191 | 98 | |
j3 | 1:e1ee2549a047 | 99 | result = write_config_register(true, MAX7300_S_BIT); |
j3 | 0:350a850a7191 | 100 | |
j3 | 0:350a850a7191 | 101 | return result; |
j3 | 0:350a850a7191 | 102 | } |
j3 | 0:350a850a7191 | 103 | |
j3 | 0:350a850a7191 | 104 | |
j3 | 0:350a850a7191 | 105 | //********************************************************************* |
j3 | 0:350a850a7191 | 106 | int16_t Max7300::disable_ports(void) |
j3 | 0:350a850a7191 | 107 | { |
j3 | 0:350a850a7191 | 108 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 109 | |
j3 | 1:e1ee2549a047 | 110 | result = write_config_register(false, MAX7300_S_BIT); |
j3 | 1:e1ee2549a047 | 111 | |
j3 | 1:e1ee2549a047 | 112 | return result; |
j3 | 1:e1ee2549a047 | 113 | } |
j3 | 1:e1ee2549a047 | 114 | |
j3 | 1:e1ee2549a047 | 115 | |
j3 | 1:e1ee2549a047 | 116 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 117 | int16_t Max7300::enable_transition_detection(void) |
j3 | 1:e1ee2549a047 | 118 | { |
j3 | 1:e1ee2549a047 | 119 | int16_t result = -1; |
j3 | 0:350a850a7191 | 120 | |
j3 | 1:e1ee2549a047 | 121 | result = write_config_register(true, MAX7300_M_BIT); |
j3 | 1:e1ee2549a047 | 122 | |
j3 | 1:e1ee2549a047 | 123 | return result; |
j3 | 1:e1ee2549a047 | 124 | } |
j3 | 1:e1ee2549a047 | 125 | |
j3 | 1:e1ee2549a047 | 126 | |
j3 | 1:e1ee2549a047 | 127 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 128 | int16_t Max7300::disable_transition_detection(void) |
j3 | 1:e1ee2549a047 | 129 | { |
j3 | 1:e1ee2549a047 | 130 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 131 | |
j3 | 1:e1ee2549a047 | 132 | result = write_config_register(false, MAX7300_M_BIT); |
j3 | 0:350a850a7191 | 133 | |
j3 | 0:350a850a7191 | 134 | return result; |
j3 | 0:350a850a7191 | 135 | } |
j3 | 0:350a850a7191 | 136 | |
j3 | 0:350a850a7191 | 137 | |
j3 | 0:350a850a7191 | 138 | //********************************************************************* |
j3 | 0:350a850a7191 | 139 | int16_t Max7300::config_port(max7300_port_number_t port_num, max7300_port_type_t port_type) |
j3 | 0:350a850a7191 | 140 | { |
j3 | 0:350a850a7191 | 141 | int16_t result = -1; |
j3 | 0:350a850a7191 | 142 | char data[2]; |
j3 | 1:e1ee2549a047 | 143 | uint8_t cnt = 0; |
j3 | 0:350a850a7191 | 144 | |
j3 | 0:350a850a7191 | 145 | //get address of port configuration register |
j3 | 1:e1ee2549a047 | 146 | data[cnt++] = ((port_num/4) + 8); |
j3 | 0:350a850a7191 | 147 | |
j3 | 0:350a850a7191 | 148 | //get port config bits offset in that register |
j3 | 0:350a850a7191 | 149 | uint8_t offset = (port_num % 4); |
j3 | 0:350a850a7191 | 150 | |
j3 | 0:350a850a7191 | 151 | //set internal register pointer to port configuration register |
j3 | 0:350a850a7191 | 152 | result = _p_i2c->write(_w_adrs, data, 1, true); |
j3 | 0:350a850a7191 | 153 | if(!result) |
j3 | 0:350a850a7191 | 154 | { |
j3 | 0:350a850a7191 | 155 | //get current port configuration register |
j3 | 1:e1ee2549a047 | 156 | result = _p_i2c->read(_w_adrs, (data + 1), 1, true); |
j3 | 0:350a850a7191 | 157 | |
j3 | 0:350a850a7191 | 158 | if(!result) |
j3 | 0:350a850a7191 | 159 | { |
j3 | 1:e1ee2549a047 | 160 | //clear old port configuration, do not increment count |
j3 | 1:e1ee2549a047 | 161 | data[cnt] &= ~(0x03 << (offset*2)); |
j3 | 0:350a850a7191 | 162 | //set port configuration bits |
j3 | 1:e1ee2549a047 | 163 | data[cnt++] |= ((port_type & 0x03) << (offset*2)); |
j3 | 0:350a850a7191 | 164 | |
j3 | 0:350a850a7191 | 165 | //write back to device |
j3 | 1:e1ee2549a047 | 166 | result = _p_i2c->write(_w_adrs, data, cnt, false); |
j3 | 0:350a850a7191 | 167 | } |
j3 | 0:350a850a7191 | 168 | } |
j3 | 0:350a850a7191 | 169 | |
j3 | 0:350a850a7191 | 170 | return result; |
j3 | 0:350a850a7191 | 171 | } |
j3 | 0:350a850a7191 | 172 | |
j3 | 0:350a850a7191 | 173 | |
j3 | 0:350a850a7191 | 174 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 175 | int16_t Max7300::config_4_ports(max7300_port_number_t low_port, uint8_t data) |
j3 | 0:350a850a7191 | 176 | { |
j3 | 0:350a850a7191 | 177 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 178 | char local_data[2]; |
j3 | 1:e1ee2549a047 | 179 | uint8_t cnt = 0; |
j3 | 1:e1ee2549a047 | 180 | |
j3 | 1:e1ee2549a047 | 181 | if(low_port <= MAX7300_PORT_28) |
j3 | 1:e1ee2549a047 | 182 | { |
j3 | 1:e1ee2549a047 | 183 | if((low_port % 4) == 0) |
j3 | 1:e1ee2549a047 | 184 | { |
j3 | 1:e1ee2549a047 | 185 | local_data[cnt++] = ((low_port/4) + 8); |
j3 | 1:e1ee2549a047 | 186 | local_data[cnt++] = data; |
j3 | 1:e1ee2549a047 | 187 | |
j3 | 1:e1ee2549a047 | 188 | //no need for read, modify, write. |
j3 | 1:e1ee2549a047 | 189 | //Fx is intended to write whole register |
j3 | 1:e1ee2549a047 | 190 | result = _p_i2c->write(_w_adrs, local_data, cnt, false); |
j3 | 1:e1ee2549a047 | 191 | } |
j3 | 1:e1ee2549a047 | 192 | } |
j3 | 0:350a850a7191 | 193 | |
j3 | 1:e1ee2549a047 | 194 | return result; |
j3 | 1:e1ee2549a047 | 195 | } |
j3 | 1:e1ee2549a047 | 196 | |
j3 | 1:e1ee2549a047 | 197 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 198 | int16_t Max7300::config_all_ports(max7300_port_type_t port_type) |
j3 | 1:e1ee2549a047 | 199 | { |
j3 | 1:e1ee2549a047 | 200 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 201 | char data[8]; |
j3 | 1:e1ee2549a047 | 202 | char local_type = 0; |
j3 | 1:e1ee2549a047 | 203 | uint8_t cnt = 0; |
j3 | 0:350a850a7191 | 204 | |
j3 | 1:e1ee2549a047 | 205 | //build byte for each port configuration register |
j3 | 1:e1ee2549a047 | 206 | local_type = ((port_type << 6) | (port_type << 4) | (port_type << 2) | port_type); |
j3 | 1:e1ee2549a047 | 207 | |
j3 | 1:e1ee2549a047 | 208 | //stuff packet |
j3 | 1:e1ee2549a047 | 209 | data[cnt++] = MAX7300_PORT_CONFIGURATION; |
j3 | 1:e1ee2549a047 | 210 | for(/**/;cnt < 8; cnt++) |
j3 | 1:e1ee2549a047 | 211 | { |
j3 | 1:e1ee2549a047 | 212 | data[cnt] = local_type; |
j3 | 1:e1ee2549a047 | 213 | } |
j3 | 1:e1ee2549a047 | 214 | |
j3 | 1:e1ee2549a047 | 215 | result = _p_i2c->write(_w_adrs, data, cnt, false); |
j3 | 1:e1ee2549a047 | 216 | |
j3 | 0:350a850a7191 | 217 | return result; |
j3 | 0:350a850a7191 | 218 | } |
j3 | 0:350a850a7191 | 219 | |
j3 | 0:350a850a7191 | 220 | |
j3 | 0:350a850a7191 | 221 | //********************************************************************* |
j3 | 0:350a850a7191 | 222 | int16_t Max7300::read_port(max7300_port_number_t port_num) |
j3 | 0:350a850a7191 | 223 | { |
j3 | 0:350a850a7191 | 224 | int16_t result = -1; |
j3 | 0:350a850a7191 | 225 | char data[2]; |
j3 | 0:350a850a7191 | 226 | |
j3 | 1:e1ee2549a047 | 227 | data[0] = (port_num + MAX7300_PORT_ONLY_BASE_ADRS); |
j3 | 0:350a850a7191 | 228 | |
j3 | 0:350a850a7191 | 229 | //set internal register pointer to port data register |
j3 | 0:350a850a7191 | 230 | result = _p_i2c->write(_w_adrs, data, 1, true); |
j3 | 0:350a850a7191 | 231 | if(!result) |
j3 | 0:350a850a7191 | 232 | { |
j3 | 0:350a850a7191 | 233 | //get port data |
j3 | 1:e1ee2549a047 | 234 | result = _p_i2c->read(_w_adrs, (data + 1), 1, false); |
j3 | 0:350a850a7191 | 235 | if(!result) |
j3 | 0:350a850a7191 | 236 | { |
j3 | 0:350a850a7191 | 237 | result = data[1]; |
j3 | 0:350a850a7191 | 238 | } |
j3 | 0:350a850a7191 | 239 | else |
j3 | 0:350a850a7191 | 240 | { |
j3 | 0:350a850a7191 | 241 | result = -1; |
j3 | 0:350a850a7191 | 242 | } |
j3 | 0:350a850a7191 | 243 | } |
j3 | 0:350a850a7191 | 244 | |
j3 | 0:350a850a7191 | 245 | return result; |
j3 | 0:350a850a7191 | 246 | } |
j3 | 0:350a850a7191 | 247 | |
j3 | 0:350a850a7191 | 248 | |
j3 | 0:350a850a7191 | 249 | //********************************************************************* |
j3 | 0:350a850a7191 | 250 | int16_t Max7300::write_port(max7300_port_number_t port_num, uint8_t data) |
j3 | 0:350a850a7191 | 251 | { |
j3 | 0:350a850a7191 | 252 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 253 | char local_data[2]; |
j3 | 1:e1ee2549a047 | 254 | uint8_t cnt = 0; |
j3 | 1:e1ee2549a047 | 255 | |
j3 | 1:e1ee2549a047 | 256 | local_data[cnt++] = (port_num + MAX7300_PORT_ONLY_BASE_ADRS); |
j3 | 1:e1ee2549a047 | 257 | local_data[cnt++] = data; |
j3 | 0:350a850a7191 | 258 | |
j3 | 0:350a850a7191 | 259 | //no need for read, modify, write. |
j3 | 0:350a850a7191 | 260 | //Fx is intended to write whole register |
j3 | 1:e1ee2549a047 | 261 | result = _p_i2c->write(_w_adrs, local_data, cnt, false); |
j3 | 1:e1ee2549a047 | 262 | |
j3 | 1:e1ee2549a047 | 263 | return result; |
j3 | 1:e1ee2549a047 | 264 | } |
j3 | 1:e1ee2549a047 | 265 | |
j3 | 1:e1ee2549a047 | 266 | |
j3 | 1:e1ee2549a047 | 267 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 268 | int16_t Max7300::read_8_ports(max7300_port_number_t low_port) |
j3 | 1:e1ee2549a047 | 269 | { |
j3 | 1:e1ee2549a047 | 270 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 271 | char data[2]; |
j3 | 1:e1ee2549a047 | 272 | |
j3 | 1:e1ee2549a047 | 273 | if((low_port >= MAX7300_PORT_04) && (low_port <= MAX7300_PORT_24)) |
j3 | 1:e1ee2549a047 | 274 | { |
j3 | 1:e1ee2549a047 | 275 | data[0] = low_port + MAX7300_8_PORTS_OFFSET; |
j3 | 1:e1ee2549a047 | 276 | |
j3 | 1:e1ee2549a047 | 277 | //set internal register pointer to port data register |
j3 | 1:e1ee2549a047 | 278 | result = _p_i2c->write(_w_adrs, data, 1, true); |
j3 | 1:e1ee2549a047 | 279 | if(!result) |
j3 | 1:e1ee2549a047 | 280 | { |
j3 | 1:e1ee2549a047 | 281 | //get port data |
j3 | 1:e1ee2549a047 | 282 | result = _p_i2c->read(_w_adrs, (data + 1), 1, false); |
j3 | 1:e1ee2549a047 | 283 | if(!result) |
j3 | 1:e1ee2549a047 | 284 | { |
j3 | 1:e1ee2549a047 | 285 | result = data[1]; |
j3 | 1:e1ee2549a047 | 286 | } |
j3 | 1:e1ee2549a047 | 287 | else |
j3 | 1:e1ee2549a047 | 288 | { |
j3 | 1:e1ee2549a047 | 289 | result = -1; |
j3 | 1:e1ee2549a047 | 290 | } |
j3 | 1:e1ee2549a047 | 291 | } |
j3 | 1:e1ee2549a047 | 292 | } |
j3 | 1:e1ee2549a047 | 293 | |
j3 | 1:e1ee2549a047 | 294 | return result; |
j3 | 1:e1ee2549a047 | 295 | } |
j3 | 1:e1ee2549a047 | 296 | |
j3 | 1:e1ee2549a047 | 297 | |
j3 | 1:e1ee2549a047 | 298 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 299 | int16_t Max7300::write_8_ports(max7300_port_number_t low_port, uint8_t data) |
j3 | 1:e1ee2549a047 | 300 | { |
j3 | 1:e1ee2549a047 | 301 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 302 | char local_data[2]; |
j3 | 1:e1ee2549a047 | 303 | uint8_t cnt = 0; |
j3 | 1:e1ee2549a047 | 304 | |
j3 | 1:e1ee2549a047 | 305 | if(low_port <= MAX7300_PORT_24) |
j3 | 1:e1ee2549a047 | 306 | { |
j3 | 1:e1ee2549a047 | 307 | local_data[cnt++] = low_port + MAX7300_8_PORTS_OFFSET; |
j3 | 1:e1ee2549a047 | 308 | local_data[cnt++] = data; |
j3 | 1:e1ee2549a047 | 309 | |
j3 | 1:e1ee2549a047 | 310 | //no need for read, modify, write. |
j3 | 1:e1ee2549a047 | 311 | //Fx is intended to write whole register |
j3 | 1:e1ee2549a047 | 312 | result = _p_i2c->write(_w_adrs, local_data, cnt, false); |
j3 | 1:e1ee2549a047 | 313 | } |
j3 | 0:350a850a7191 | 314 | |
j3 | 0:350a850a7191 | 315 | return result; |
j3 | 0:350a850a7191 | 316 | } |
j3 | 0:350a850a7191 | 317 | |
j3 | 0:350a850a7191 | 318 | |
j3 | 0:350a850a7191 | 319 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 320 | int16_t Max7300::read_mask_register(bool enable_snapshot) |
j3 | 0:350a850a7191 | 321 | { |
j3 | 0:350a850a7191 | 322 | int16_t result = -1; |
j3 | 0:350a850a7191 | 323 | char data[2]; |
j3 | 0:350a850a7191 | 324 | |
j3 | 1:e1ee2549a047 | 325 | data[0] = MAX7300_TRANSITION_DETECT_MASK; |
j3 | 0:350a850a7191 | 326 | |
j3 | 1:e1ee2549a047 | 327 | //set internal register pointer to mask register |
j3 | 0:350a850a7191 | 328 | result = _p_i2c->write(_w_adrs, data, 1, true); |
j3 | 0:350a850a7191 | 329 | if(!result) |
j3 | 0:350a850a7191 | 330 | { |
j3 | 1:e1ee2549a047 | 331 | //get mask data |
j3 | 1:e1ee2549a047 | 332 | result = _p_i2c->read(_w_adrs, (data + 1), 1, false); |
j3 | 0:350a850a7191 | 333 | if(!result) |
j3 | 0:350a850a7191 | 334 | { |
j3 | 1:e1ee2549a047 | 335 | if(enable_snapshot) |
j3 | 1:e1ee2549a047 | 336 | { |
j3 | 1:e1ee2549a047 | 337 | result = enable_transition_detection(); |
j3 | 1:e1ee2549a047 | 338 | if(!result) |
j3 | 1:e1ee2549a047 | 339 | { |
j3 | 1:e1ee2549a047 | 340 | result = data[1]; |
j3 | 1:e1ee2549a047 | 341 | } |
j3 | 1:e1ee2549a047 | 342 | else |
j3 | 1:e1ee2549a047 | 343 | { |
j3 | 1:e1ee2549a047 | 344 | result = -1; |
j3 | 1:e1ee2549a047 | 345 | } |
j3 | 1:e1ee2549a047 | 346 | } |
j3 | 1:e1ee2549a047 | 347 | else |
j3 | 1:e1ee2549a047 | 348 | { |
j3 | 1:e1ee2549a047 | 349 | result = data[1]; |
j3 | 1:e1ee2549a047 | 350 | } |
j3 | 0:350a850a7191 | 351 | } |
j3 | 0:350a850a7191 | 352 | else |
j3 | 0:350a850a7191 | 353 | { |
j3 | 0:350a850a7191 | 354 | result = -1; |
j3 | 0:350a850a7191 | 355 | } |
j3 | 0:350a850a7191 | 356 | } |
j3 | 1:e1ee2549a047 | 357 | |
j3 | 1:e1ee2549a047 | 358 | return result; |
j3 | 1:e1ee2549a047 | 359 | } |
j3 | 1:e1ee2549a047 | 360 | |
j3 | 1:e1ee2549a047 | 361 | |
j3 | 1:e1ee2549a047 | 362 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 363 | int16_t Max7300::write_mask_register(uint8_t data) |
j3 | 1:e1ee2549a047 | 364 | { |
j3 | 1:e1ee2549a047 | 365 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 366 | char local_data[2]; |
j3 | 1:e1ee2549a047 | 367 | uint8_t cnt = 0; |
j3 | 1:e1ee2549a047 | 368 | |
j3 | 1:e1ee2549a047 | 369 | local_data[cnt++] = MAX7300_TRANSITION_DETECT_MASK; |
j3 | 1:e1ee2549a047 | 370 | local_data[cnt++] = data; |
j3 | 1:e1ee2549a047 | 371 | |
j3 | 1:e1ee2549a047 | 372 | //no need for read, modify, write. |
j3 | 1:e1ee2549a047 | 373 | //Fx is intended to write whole register |
j3 | 1:e1ee2549a047 | 374 | result = _p_i2c->write(_w_adrs, local_data, cnt, false); |
j3 | 1:e1ee2549a047 | 375 | |
j3 | 0:350a850a7191 | 376 | return result; |
j3 | 0:350a850a7191 | 377 | } |
j3 | 0:350a850a7191 | 378 | |
j3 | 0:350a850a7191 | 379 | |
j3 | 0:350a850a7191 | 380 | //********************************************************************* |
j3 | 1:e1ee2549a047 | 381 | int16_t Max7300::write_config_register(bool set_clear, uint8_t data) |
j3 | 0:350a850a7191 | 382 | { |
j3 | 0:350a850a7191 | 383 | int16_t result = -1; |
j3 | 1:e1ee2549a047 | 384 | char local_data[2]; |
j3 | 1:e1ee2549a047 | 385 | uint8_t cnt = 0; |
j3 | 1:e1ee2549a047 | 386 | |
j3 | 1:e1ee2549a047 | 387 | local_data[cnt++] = MAX7300_CONFIGURATION; |
j3 | 0:350a850a7191 | 388 | |
j3 | 1:e1ee2549a047 | 389 | //set internal register pointer to configuration register |
j3 | 1:e1ee2549a047 | 390 | result = _p_i2c->write(_w_adrs, local_data, 1, true); |
j3 | 1:e1ee2549a047 | 391 | if(!result) |
j3 | 1:e1ee2549a047 | 392 | { |
j3 | 1:e1ee2549a047 | 393 | //get current configuration register |
j3 | 1:e1ee2549a047 | 394 | result = _p_i2c->read(_w_adrs, (local_data + 1), 1, true); |
j3 | 1:e1ee2549a047 | 395 | |
j3 | 1:e1ee2549a047 | 396 | if(!result) |
j3 | 1:e1ee2549a047 | 397 | { |
j3 | 1:e1ee2549a047 | 398 | if(set_clear) |
j3 | 1:e1ee2549a047 | 399 | { |
j3 | 1:e1ee2549a047 | 400 | local_data[cnt++] |= data; |
j3 | 1:e1ee2549a047 | 401 | } |
j3 | 1:e1ee2549a047 | 402 | else |
j3 | 1:e1ee2549a047 | 403 | { |
j3 | 1:e1ee2549a047 | 404 | local_data[cnt++] &= ~data; |
j3 | 1:e1ee2549a047 | 405 | } |
j3 | 1:e1ee2549a047 | 406 | |
j3 | 1:e1ee2549a047 | 407 | //write back to device |
j3 | 1:e1ee2549a047 | 408 | result = _p_i2c->write(_w_adrs, local_data, cnt, false); |
j3 | 1:e1ee2549a047 | 409 | } |
j3 | 1:e1ee2549a047 | 410 | } |
j3 | 1:e1ee2549a047 | 411 | |
j3 | 0:350a850a7191 | 412 | return result; |
j3 | 0:350a850a7191 | 413 | } |