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Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466
mbed-os/drivers/I2C.cpp@0:8fdf9a60065b, 2018-10-10 (annotated)
- Committer:
- kadonotakashi
- Date:
- Wed Oct 10 00:33:53 2018 +0000
- Revision:
- 0:8fdf9a60065b
how to make mbed librry
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kadonotakashi | 0:8fdf9a60065b | 1 | /* mbed Microcontroller Library |
kadonotakashi | 0:8fdf9a60065b | 2 | * Copyright (c) 2006-2015 ARM Limited |
kadonotakashi | 0:8fdf9a60065b | 3 | * |
kadonotakashi | 0:8fdf9a60065b | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
kadonotakashi | 0:8fdf9a60065b | 5 | * you may not use this file except in compliance with the License. |
kadonotakashi | 0:8fdf9a60065b | 6 | * You may obtain a copy of the License at |
kadonotakashi | 0:8fdf9a60065b | 7 | * |
kadonotakashi | 0:8fdf9a60065b | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
kadonotakashi | 0:8fdf9a60065b | 9 | * |
kadonotakashi | 0:8fdf9a60065b | 10 | * Unless required by applicable law or agreed to in writing, software |
kadonotakashi | 0:8fdf9a60065b | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
kadonotakashi | 0:8fdf9a60065b | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kadonotakashi | 0:8fdf9a60065b | 13 | * See the License for the specific language governing permissions and |
kadonotakashi | 0:8fdf9a60065b | 14 | * limitations under the License. |
kadonotakashi | 0:8fdf9a60065b | 15 | */ |
kadonotakashi | 0:8fdf9a60065b | 16 | |
kadonotakashi | 0:8fdf9a60065b | 17 | #include "drivers/I2C.h" |
kadonotakashi | 0:8fdf9a60065b | 18 | #include "drivers/DigitalInOut.h" |
kadonotakashi | 0:8fdf9a60065b | 19 | #include "platform/mbed_wait_api.h" |
kadonotakashi | 0:8fdf9a60065b | 20 | |
kadonotakashi | 0:8fdf9a60065b | 21 | #if DEVICE_I2C |
kadonotakashi | 0:8fdf9a60065b | 22 | |
kadonotakashi | 0:8fdf9a60065b | 23 | #if DEVICE_I2C_ASYNCH |
kadonotakashi | 0:8fdf9a60065b | 24 | #include "platform/mbed_power_mgmt.h" |
kadonotakashi | 0:8fdf9a60065b | 25 | #endif |
kadonotakashi | 0:8fdf9a60065b | 26 | |
kadonotakashi | 0:8fdf9a60065b | 27 | namespace mbed { |
kadonotakashi | 0:8fdf9a60065b | 28 | |
kadonotakashi | 0:8fdf9a60065b | 29 | I2C *I2C::_owner = NULL; |
kadonotakashi | 0:8fdf9a60065b | 30 | SingletonPtr<PlatformMutex> I2C::_mutex; |
kadonotakashi | 0:8fdf9a60065b | 31 | |
kadonotakashi | 0:8fdf9a60065b | 32 | I2C::I2C(PinName sda, PinName scl) : |
kadonotakashi | 0:8fdf9a60065b | 33 | #if DEVICE_I2C_ASYNCH |
kadonotakashi | 0:8fdf9a60065b | 34 | _irq(this), _usage(DMA_USAGE_NEVER), _deep_sleep_locked(false), |
kadonotakashi | 0:8fdf9a60065b | 35 | #endif |
kadonotakashi | 0:8fdf9a60065b | 36 | _i2c(), _hz(100000) |
kadonotakashi | 0:8fdf9a60065b | 37 | { |
kadonotakashi | 0:8fdf9a60065b | 38 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 39 | // The init function also set the frequency to 100000 |
kadonotakashi | 0:8fdf9a60065b | 40 | _sda = sda; |
kadonotakashi | 0:8fdf9a60065b | 41 | _scl = scl; |
kadonotakashi | 0:8fdf9a60065b | 42 | recover(sda, scl); |
kadonotakashi | 0:8fdf9a60065b | 43 | i2c_init(&_i2c, _sda, _scl); |
kadonotakashi | 0:8fdf9a60065b | 44 | // Used to avoid unnecessary frequency updates |
kadonotakashi | 0:8fdf9a60065b | 45 | _owner = this; |
kadonotakashi | 0:8fdf9a60065b | 46 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 47 | } |
kadonotakashi | 0:8fdf9a60065b | 48 | |
kadonotakashi | 0:8fdf9a60065b | 49 | void I2C::frequency(int hz) |
kadonotakashi | 0:8fdf9a60065b | 50 | { |
kadonotakashi | 0:8fdf9a60065b | 51 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 52 | _hz = hz; |
kadonotakashi | 0:8fdf9a60065b | 53 | |
kadonotakashi | 0:8fdf9a60065b | 54 | // We want to update the frequency even if we are already the bus owners |
kadonotakashi | 0:8fdf9a60065b | 55 | i2c_frequency(&_i2c, _hz); |
kadonotakashi | 0:8fdf9a60065b | 56 | |
kadonotakashi | 0:8fdf9a60065b | 57 | // Updating the frequency of the bus we become the owners of it |
kadonotakashi | 0:8fdf9a60065b | 58 | _owner = this; |
kadonotakashi | 0:8fdf9a60065b | 59 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 60 | } |
kadonotakashi | 0:8fdf9a60065b | 61 | |
kadonotakashi | 0:8fdf9a60065b | 62 | void I2C::aquire() |
kadonotakashi | 0:8fdf9a60065b | 63 | { |
kadonotakashi | 0:8fdf9a60065b | 64 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 65 | if (_owner != this) { |
kadonotakashi | 0:8fdf9a60065b | 66 | i2c_frequency(&_i2c, _hz); |
kadonotakashi | 0:8fdf9a60065b | 67 | _owner = this; |
kadonotakashi | 0:8fdf9a60065b | 68 | } |
kadonotakashi | 0:8fdf9a60065b | 69 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 70 | } |
kadonotakashi | 0:8fdf9a60065b | 71 | |
kadonotakashi | 0:8fdf9a60065b | 72 | // write - Master Transmitter Mode |
kadonotakashi | 0:8fdf9a60065b | 73 | int I2C::write(int address, const char *data, int length, bool repeated) |
kadonotakashi | 0:8fdf9a60065b | 74 | { |
kadonotakashi | 0:8fdf9a60065b | 75 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 76 | aquire(); |
kadonotakashi | 0:8fdf9a60065b | 77 | |
kadonotakashi | 0:8fdf9a60065b | 78 | int stop = (repeated) ? 0 : 1; |
kadonotakashi | 0:8fdf9a60065b | 79 | int written = i2c_write(&_i2c, address, data, length, stop); |
kadonotakashi | 0:8fdf9a60065b | 80 | |
kadonotakashi | 0:8fdf9a60065b | 81 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 82 | return length != written; |
kadonotakashi | 0:8fdf9a60065b | 83 | } |
kadonotakashi | 0:8fdf9a60065b | 84 | |
kadonotakashi | 0:8fdf9a60065b | 85 | int I2C::write(int data) |
kadonotakashi | 0:8fdf9a60065b | 86 | { |
kadonotakashi | 0:8fdf9a60065b | 87 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 88 | int ret = i2c_byte_write(&_i2c, data); |
kadonotakashi | 0:8fdf9a60065b | 89 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 90 | return ret; |
kadonotakashi | 0:8fdf9a60065b | 91 | } |
kadonotakashi | 0:8fdf9a60065b | 92 | |
kadonotakashi | 0:8fdf9a60065b | 93 | // read - Master Receiver Mode |
kadonotakashi | 0:8fdf9a60065b | 94 | int I2C::read(int address, char *data, int length, bool repeated) |
kadonotakashi | 0:8fdf9a60065b | 95 | { |
kadonotakashi | 0:8fdf9a60065b | 96 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 97 | aquire(); |
kadonotakashi | 0:8fdf9a60065b | 98 | |
kadonotakashi | 0:8fdf9a60065b | 99 | int stop = (repeated) ? 0 : 1; |
kadonotakashi | 0:8fdf9a60065b | 100 | int read = i2c_read(&_i2c, address, data, length, stop); |
kadonotakashi | 0:8fdf9a60065b | 101 | |
kadonotakashi | 0:8fdf9a60065b | 102 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 103 | return length != read; |
kadonotakashi | 0:8fdf9a60065b | 104 | } |
kadonotakashi | 0:8fdf9a60065b | 105 | |
kadonotakashi | 0:8fdf9a60065b | 106 | int I2C::read(int ack) |
kadonotakashi | 0:8fdf9a60065b | 107 | { |
kadonotakashi | 0:8fdf9a60065b | 108 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 109 | int ret; |
kadonotakashi | 0:8fdf9a60065b | 110 | if (ack) { |
kadonotakashi | 0:8fdf9a60065b | 111 | ret = i2c_byte_read(&_i2c, 0); |
kadonotakashi | 0:8fdf9a60065b | 112 | } else { |
kadonotakashi | 0:8fdf9a60065b | 113 | ret = i2c_byte_read(&_i2c, 1); |
kadonotakashi | 0:8fdf9a60065b | 114 | } |
kadonotakashi | 0:8fdf9a60065b | 115 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 116 | return ret; |
kadonotakashi | 0:8fdf9a60065b | 117 | } |
kadonotakashi | 0:8fdf9a60065b | 118 | |
kadonotakashi | 0:8fdf9a60065b | 119 | void I2C::start(void) |
kadonotakashi | 0:8fdf9a60065b | 120 | { |
kadonotakashi | 0:8fdf9a60065b | 121 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 122 | i2c_start(&_i2c); |
kadonotakashi | 0:8fdf9a60065b | 123 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 124 | } |
kadonotakashi | 0:8fdf9a60065b | 125 | |
kadonotakashi | 0:8fdf9a60065b | 126 | void I2C::stop(void) |
kadonotakashi | 0:8fdf9a60065b | 127 | { |
kadonotakashi | 0:8fdf9a60065b | 128 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 129 | i2c_stop(&_i2c); |
kadonotakashi | 0:8fdf9a60065b | 130 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 131 | } |
kadonotakashi | 0:8fdf9a60065b | 132 | |
kadonotakashi | 0:8fdf9a60065b | 133 | void I2C::lock() |
kadonotakashi | 0:8fdf9a60065b | 134 | { |
kadonotakashi | 0:8fdf9a60065b | 135 | _mutex->lock(); |
kadonotakashi | 0:8fdf9a60065b | 136 | } |
kadonotakashi | 0:8fdf9a60065b | 137 | |
kadonotakashi | 0:8fdf9a60065b | 138 | void I2C::unlock() |
kadonotakashi | 0:8fdf9a60065b | 139 | { |
kadonotakashi | 0:8fdf9a60065b | 140 | _mutex->unlock(); |
kadonotakashi | 0:8fdf9a60065b | 141 | } |
kadonotakashi | 0:8fdf9a60065b | 142 | |
kadonotakashi | 0:8fdf9a60065b | 143 | int I2C::recover(PinName sda, PinName scl) |
kadonotakashi | 0:8fdf9a60065b | 144 | { |
kadonotakashi | 0:8fdf9a60065b | 145 | DigitalInOut pin_sda(sda, PIN_INPUT, PullNone, 1); |
kadonotakashi | 0:8fdf9a60065b | 146 | DigitalInOut pin_scl(scl, PIN_INPUT, PullNone, 1); |
kadonotakashi | 0:8fdf9a60065b | 147 | |
kadonotakashi | 0:8fdf9a60065b | 148 | // Return as SCL is low and no access to become master. |
kadonotakashi | 0:8fdf9a60065b | 149 | if (pin_scl == 0) { |
kadonotakashi | 0:8fdf9a60065b | 150 | return I2C_ERROR_BUS_BUSY; |
kadonotakashi | 0:8fdf9a60065b | 151 | } |
kadonotakashi | 0:8fdf9a60065b | 152 | |
kadonotakashi | 0:8fdf9a60065b | 153 | // Return successfully as SDA and SCL is high |
kadonotakashi | 0:8fdf9a60065b | 154 | if (pin_sda == 1) { |
kadonotakashi | 0:8fdf9a60065b | 155 | return 0; |
kadonotakashi | 0:8fdf9a60065b | 156 | } |
kadonotakashi | 0:8fdf9a60065b | 157 | |
kadonotakashi | 0:8fdf9a60065b | 158 | // Send clock pulses, for device to recover 9 |
kadonotakashi | 0:8fdf9a60065b | 159 | pin_scl.mode(PullNone); |
kadonotakashi | 0:8fdf9a60065b | 160 | pin_scl.output(); |
kadonotakashi | 0:8fdf9a60065b | 161 | for (int count = 0; count < 10; count++) { |
kadonotakashi | 0:8fdf9a60065b | 162 | pin_scl.mode(PullNone); |
kadonotakashi | 0:8fdf9a60065b | 163 | pin_scl = 0; |
kadonotakashi | 0:8fdf9a60065b | 164 | wait_us(5); |
kadonotakashi | 0:8fdf9a60065b | 165 | pin_scl.mode(PullUp); |
kadonotakashi | 0:8fdf9a60065b | 166 | pin_scl = 1; |
kadonotakashi | 0:8fdf9a60065b | 167 | wait_us(5); |
kadonotakashi | 0:8fdf9a60065b | 168 | } |
kadonotakashi | 0:8fdf9a60065b | 169 | |
kadonotakashi | 0:8fdf9a60065b | 170 | // Send Stop |
kadonotakashi | 0:8fdf9a60065b | 171 | pin_sda.output(); |
kadonotakashi | 0:8fdf9a60065b | 172 | pin_sda = 0; |
kadonotakashi | 0:8fdf9a60065b | 173 | wait_us(5); |
kadonotakashi | 0:8fdf9a60065b | 174 | pin_scl = 1; |
kadonotakashi | 0:8fdf9a60065b | 175 | wait_us(5); |
kadonotakashi | 0:8fdf9a60065b | 176 | pin_sda = 1; |
kadonotakashi | 0:8fdf9a60065b | 177 | wait_us(5); |
kadonotakashi | 0:8fdf9a60065b | 178 | |
kadonotakashi | 0:8fdf9a60065b | 179 | pin_sda.input(); |
kadonotakashi | 0:8fdf9a60065b | 180 | pin_scl.input(); |
kadonotakashi | 0:8fdf9a60065b | 181 | if ((pin_scl == 0) || (pin_sda == 0)) { |
kadonotakashi | 0:8fdf9a60065b | 182 | // Return as SCL is low and no access to become master. |
kadonotakashi | 0:8fdf9a60065b | 183 | return I2C_ERROR_BUS_BUSY; |
kadonotakashi | 0:8fdf9a60065b | 184 | } |
kadonotakashi | 0:8fdf9a60065b | 185 | |
kadonotakashi | 0:8fdf9a60065b | 186 | return 0; |
kadonotakashi | 0:8fdf9a60065b | 187 | } |
kadonotakashi | 0:8fdf9a60065b | 188 | |
kadonotakashi | 0:8fdf9a60065b | 189 | #if DEVICE_I2C_ASYNCH |
kadonotakashi | 0:8fdf9a60065b | 190 | |
kadonotakashi | 0:8fdf9a60065b | 191 | int I2C::transfer(int address, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, const event_callback_t &callback, int event, bool repeated) |
kadonotakashi | 0:8fdf9a60065b | 192 | { |
kadonotakashi | 0:8fdf9a60065b | 193 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 194 | if (i2c_active(&_i2c)) { |
kadonotakashi | 0:8fdf9a60065b | 195 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 196 | return -1; // transaction ongoing |
kadonotakashi | 0:8fdf9a60065b | 197 | } |
kadonotakashi | 0:8fdf9a60065b | 198 | lock_deep_sleep(); |
kadonotakashi | 0:8fdf9a60065b | 199 | aquire(); |
kadonotakashi | 0:8fdf9a60065b | 200 | |
kadonotakashi | 0:8fdf9a60065b | 201 | _callback = callback; |
kadonotakashi | 0:8fdf9a60065b | 202 | int stop = (repeated) ? 0 : 1; |
kadonotakashi | 0:8fdf9a60065b | 203 | _irq.callback(&I2C::irq_handler_asynch); |
kadonotakashi | 0:8fdf9a60065b | 204 | i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage); |
kadonotakashi | 0:8fdf9a60065b | 205 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 206 | return 0; |
kadonotakashi | 0:8fdf9a60065b | 207 | } |
kadonotakashi | 0:8fdf9a60065b | 208 | |
kadonotakashi | 0:8fdf9a60065b | 209 | void I2C::abort_transfer(void) |
kadonotakashi | 0:8fdf9a60065b | 210 | { |
kadonotakashi | 0:8fdf9a60065b | 211 | lock(); |
kadonotakashi | 0:8fdf9a60065b | 212 | i2c_abort_asynch(&_i2c); |
kadonotakashi | 0:8fdf9a60065b | 213 | unlock_deep_sleep(); |
kadonotakashi | 0:8fdf9a60065b | 214 | unlock(); |
kadonotakashi | 0:8fdf9a60065b | 215 | } |
kadonotakashi | 0:8fdf9a60065b | 216 | |
kadonotakashi | 0:8fdf9a60065b | 217 | void I2C::irq_handler_asynch(void) |
kadonotakashi | 0:8fdf9a60065b | 218 | { |
kadonotakashi | 0:8fdf9a60065b | 219 | int event = i2c_irq_handler_asynch(&_i2c); |
kadonotakashi | 0:8fdf9a60065b | 220 | if (_callback && event) { |
kadonotakashi | 0:8fdf9a60065b | 221 | _callback.call(event); |
kadonotakashi | 0:8fdf9a60065b | 222 | } |
kadonotakashi | 0:8fdf9a60065b | 223 | |
kadonotakashi | 0:8fdf9a60065b | 224 | if (event) { |
kadonotakashi | 0:8fdf9a60065b | 225 | unlock_deep_sleep(); |
kadonotakashi | 0:8fdf9a60065b | 226 | } |
kadonotakashi | 0:8fdf9a60065b | 227 | } |
kadonotakashi | 0:8fdf9a60065b | 228 | |
kadonotakashi | 0:8fdf9a60065b | 229 | void I2C::lock_deep_sleep() |
kadonotakashi | 0:8fdf9a60065b | 230 | { |
kadonotakashi | 0:8fdf9a60065b | 231 | if (_deep_sleep_locked == false) { |
kadonotakashi | 0:8fdf9a60065b | 232 | sleep_manager_lock_deep_sleep(); |
kadonotakashi | 0:8fdf9a60065b | 233 | _deep_sleep_locked = true; |
kadonotakashi | 0:8fdf9a60065b | 234 | } |
kadonotakashi | 0:8fdf9a60065b | 235 | } |
kadonotakashi | 0:8fdf9a60065b | 236 | |
kadonotakashi | 0:8fdf9a60065b | 237 | void I2C::unlock_deep_sleep() |
kadonotakashi | 0:8fdf9a60065b | 238 | { |
kadonotakashi | 0:8fdf9a60065b | 239 | if (_deep_sleep_locked == true) { |
kadonotakashi | 0:8fdf9a60065b | 240 | sleep_manager_unlock_deep_sleep(); |
kadonotakashi | 0:8fdf9a60065b | 241 | _deep_sleep_locked = false; |
kadonotakashi | 0:8fdf9a60065b | 242 | } |
kadonotakashi | 0:8fdf9a60065b | 243 | } |
kadonotakashi | 0:8fdf9a60065b | 244 | |
kadonotakashi | 0:8fdf9a60065b | 245 | #endif |
kadonotakashi | 0:8fdf9a60065b | 246 | |
kadonotakashi | 0:8fdf9a60065b | 247 | } // namespace mbed |
kadonotakashi | 0:8fdf9a60065b | 248 | |
kadonotakashi | 0:8fdf9a60065b | 249 | #endif |