RTC auf true
drivers/I2C.cpp@0:38ceb79fef03, 2018-11-28 (annotated)
- Committer:
- kevman
- Date:
- Wed Nov 28 15:10:15 2018 +0000
- Revision:
- 0:38ceb79fef03
RTC modified
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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kevman | 0:38ceb79fef03 | 1 | /* mbed Microcontroller Library |
kevman | 0:38ceb79fef03 | 2 | * Copyright (c) 2006-2015 ARM Limited |
kevman | 0:38ceb79fef03 | 3 | * |
kevman | 0:38ceb79fef03 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
kevman | 0:38ceb79fef03 | 5 | * you may not use this file except in compliance with the License. |
kevman | 0:38ceb79fef03 | 6 | * You may obtain a copy of the License at |
kevman | 0:38ceb79fef03 | 7 | * |
kevman | 0:38ceb79fef03 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
kevman | 0:38ceb79fef03 | 9 | * |
kevman | 0:38ceb79fef03 | 10 | * Unless required by applicable law or agreed to in writing, software |
kevman | 0:38ceb79fef03 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
kevman | 0:38ceb79fef03 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kevman | 0:38ceb79fef03 | 13 | * See the License for the specific language governing permissions and |
kevman | 0:38ceb79fef03 | 14 | * limitations under the License. |
kevman | 0:38ceb79fef03 | 15 | */ |
kevman | 0:38ceb79fef03 | 16 | #include "drivers/I2C.h" |
kevman | 0:38ceb79fef03 | 17 | |
kevman | 0:38ceb79fef03 | 18 | #if DEVICE_I2C |
kevman | 0:38ceb79fef03 | 19 | |
kevman | 0:38ceb79fef03 | 20 | #if DEVICE_I2C_ASYNCH |
kevman | 0:38ceb79fef03 | 21 | #include "platform/mbed_power_mgmt.h" |
kevman | 0:38ceb79fef03 | 22 | #endif |
kevman | 0:38ceb79fef03 | 23 | |
kevman | 0:38ceb79fef03 | 24 | namespace mbed { |
kevman | 0:38ceb79fef03 | 25 | |
kevman | 0:38ceb79fef03 | 26 | I2C *I2C::_owner = NULL; |
kevman | 0:38ceb79fef03 | 27 | SingletonPtr<PlatformMutex> I2C::_mutex; |
kevman | 0:38ceb79fef03 | 28 | |
kevman | 0:38ceb79fef03 | 29 | I2C::I2C(PinName sda, PinName scl) : |
kevman | 0:38ceb79fef03 | 30 | #if DEVICE_I2C_ASYNCH |
kevman | 0:38ceb79fef03 | 31 | _irq(this), _usage(DMA_USAGE_NEVER), _deep_sleep_locked(false), |
kevman | 0:38ceb79fef03 | 32 | #endif |
kevman | 0:38ceb79fef03 | 33 | _i2c(), _hz(100000) |
kevman | 0:38ceb79fef03 | 34 | { |
kevman | 0:38ceb79fef03 | 35 | // No lock needed in the constructor |
kevman | 0:38ceb79fef03 | 36 | |
kevman | 0:38ceb79fef03 | 37 | // The init function also set the frequency to 100000 |
kevman | 0:38ceb79fef03 | 38 | i2c_init(&_i2c, sda, scl); |
kevman | 0:38ceb79fef03 | 39 | |
kevman | 0:38ceb79fef03 | 40 | // Used to avoid unnecessary frequency updates |
kevman | 0:38ceb79fef03 | 41 | _owner = this; |
kevman | 0:38ceb79fef03 | 42 | } |
kevman | 0:38ceb79fef03 | 43 | |
kevman | 0:38ceb79fef03 | 44 | void I2C::frequency(int hz) |
kevman | 0:38ceb79fef03 | 45 | { |
kevman | 0:38ceb79fef03 | 46 | lock(); |
kevman | 0:38ceb79fef03 | 47 | _hz = hz; |
kevman | 0:38ceb79fef03 | 48 | |
kevman | 0:38ceb79fef03 | 49 | // We want to update the frequency even if we are already the bus owners |
kevman | 0:38ceb79fef03 | 50 | i2c_frequency(&_i2c, _hz); |
kevman | 0:38ceb79fef03 | 51 | |
kevman | 0:38ceb79fef03 | 52 | // Updating the frequency of the bus we become the owners of it |
kevman | 0:38ceb79fef03 | 53 | _owner = this; |
kevman | 0:38ceb79fef03 | 54 | unlock(); |
kevman | 0:38ceb79fef03 | 55 | } |
kevman | 0:38ceb79fef03 | 56 | |
kevman | 0:38ceb79fef03 | 57 | void I2C::aquire() |
kevman | 0:38ceb79fef03 | 58 | { |
kevman | 0:38ceb79fef03 | 59 | lock(); |
kevman | 0:38ceb79fef03 | 60 | if (_owner != this) { |
kevman | 0:38ceb79fef03 | 61 | i2c_frequency(&_i2c, _hz); |
kevman | 0:38ceb79fef03 | 62 | _owner = this; |
kevman | 0:38ceb79fef03 | 63 | } |
kevman | 0:38ceb79fef03 | 64 | unlock(); |
kevman | 0:38ceb79fef03 | 65 | } |
kevman | 0:38ceb79fef03 | 66 | |
kevman | 0:38ceb79fef03 | 67 | // write - Master Transmitter Mode |
kevman | 0:38ceb79fef03 | 68 | int I2C::write(int address, const char *data, int length, bool repeated) |
kevman | 0:38ceb79fef03 | 69 | { |
kevman | 0:38ceb79fef03 | 70 | lock(); |
kevman | 0:38ceb79fef03 | 71 | aquire(); |
kevman | 0:38ceb79fef03 | 72 | |
kevman | 0:38ceb79fef03 | 73 | int stop = (repeated) ? 0 : 1; |
kevman | 0:38ceb79fef03 | 74 | int written = i2c_write(&_i2c, address, data, length, stop); |
kevman | 0:38ceb79fef03 | 75 | |
kevman | 0:38ceb79fef03 | 76 | unlock(); |
kevman | 0:38ceb79fef03 | 77 | return length != written; |
kevman | 0:38ceb79fef03 | 78 | } |
kevman | 0:38ceb79fef03 | 79 | |
kevman | 0:38ceb79fef03 | 80 | int I2C::write(int data) |
kevman | 0:38ceb79fef03 | 81 | { |
kevman | 0:38ceb79fef03 | 82 | lock(); |
kevman | 0:38ceb79fef03 | 83 | int ret = i2c_byte_write(&_i2c, data); |
kevman | 0:38ceb79fef03 | 84 | unlock(); |
kevman | 0:38ceb79fef03 | 85 | return ret; |
kevman | 0:38ceb79fef03 | 86 | } |
kevman | 0:38ceb79fef03 | 87 | |
kevman | 0:38ceb79fef03 | 88 | // read - Master Receiver Mode |
kevman | 0:38ceb79fef03 | 89 | int I2C::read(int address, char *data, int length, bool repeated) |
kevman | 0:38ceb79fef03 | 90 | { |
kevman | 0:38ceb79fef03 | 91 | lock(); |
kevman | 0:38ceb79fef03 | 92 | aquire(); |
kevman | 0:38ceb79fef03 | 93 | |
kevman | 0:38ceb79fef03 | 94 | int stop = (repeated) ? 0 : 1; |
kevman | 0:38ceb79fef03 | 95 | int read = i2c_read(&_i2c, address, data, length, stop); |
kevman | 0:38ceb79fef03 | 96 | |
kevman | 0:38ceb79fef03 | 97 | unlock(); |
kevman | 0:38ceb79fef03 | 98 | return length != read; |
kevman | 0:38ceb79fef03 | 99 | } |
kevman | 0:38ceb79fef03 | 100 | |
kevman | 0:38ceb79fef03 | 101 | int I2C::read(int ack) |
kevman | 0:38ceb79fef03 | 102 | { |
kevman | 0:38ceb79fef03 | 103 | lock(); |
kevman | 0:38ceb79fef03 | 104 | int ret; |
kevman | 0:38ceb79fef03 | 105 | if (ack) { |
kevman | 0:38ceb79fef03 | 106 | ret = i2c_byte_read(&_i2c, 0); |
kevman | 0:38ceb79fef03 | 107 | } else { |
kevman | 0:38ceb79fef03 | 108 | ret = i2c_byte_read(&_i2c, 1); |
kevman | 0:38ceb79fef03 | 109 | } |
kevman | 0:38ceb79fef03 | 110 | unlock(); |
kevman | 0:38ceb79fef03 | 111 | return ret; |
kevman | 0:38ceb79fef03 | 112 | } |
kevman | 0:38ceb79fef03 | 113 | |
kevman | 0:38ceb79fef03 | 114 | void I2C::start(void) |
kevman | 0:38ceb79fef03 | 115 | { |
kevman | 0:38ceb79fef03 | 116 | lock(); |
kevman | 0:38ceb79fef03 | 117 | i2c_start(&_i2c); |
kevman | 0:38ceb79fef03 | 118 | unlock(); |
kevman | 0:38ceb79fef03 | 119 | } |
kevman | 0:38ceb79fef03 | 120 | |
kevman | 0:38ceb79fef03 | 121 | void I2C::stop(void) |
kevman | 0:38ceb79fef03 | 122 | { |
kevman | 0:38ceb79fef03 | 123 | lock(); |
kevman | 0:38ceb79fef03 | 124 | i2c_stop(&_i2c); |
kevman | 0:38ceb79fef03 | 125 | unlock(); |
kevman | 0:38ceb79fef03 | 126 | } |
kevman | 0:38ceb79fef03 | 127 | |
kevman | 0:38ceb79fef03 | 128 | void I2C::lock() |
kevman | 0:38ceb79fef03 | 129 | { |
kevman | 0:38ceb79fef03 | 130 | _mutex->lock(); |
kevman | 0:38ceb79fef03 | 131 | } |
kevman | 0:38ceb79fef03 | 132 | |
kevman | 0:38ceb79fef03 | 133 | void I2C::unlock() |
kevman | 0:38ceb79fef03 | 134 | { |
kevman | 0:38ceb79fef03 | 135 | _mutex->unlock(); |
kevman | 0:38ceb79fef03 | 136 | } |
kevman | 0:38ceb79fef03 | 137 | |
kevman | 0:38ceb79fef03 | 138 | #if DEVICE_I2C_ASYNCH |
kevman | 0:38ceb79fef03 | 139 | |
kevman | 0:38ceb79fef03 | 140 | 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) |
kevman | 0:38ceb79fef03 | 141 | { |
kevman | 0:38ceb79fef03 | 142 | lock(); |
kevman | 0:38ceb79fef03 | 143 | if (i2c_active(&_i2c)) { |
kevman | 0:38ceb79fef03 | 144 | unlock(); |
kevman | 0:38ceb79fef03 | 145 | return -1; // transaction ongoing |
kevman | 0:38ceb79fef03 | 146 | } |
kevman | 0:38ceb79fef03 | 147 | lock_deep_sleep(); |
kevman | 0:38ceb79fef03 | 148 | aquire(); |
kevman | 0:38ceb79fef03 | 149 | |
kevman | 0:38ceb79fef03 | 150 | _callback = callback; |
kevman | 0:38ceb79fef03 | 151 | int stop = (repeated) ? 0 : 1; |
kevman | 0:38ceb79fef03 | 152 | _irq.callback(&I2C::irq_handler_asynch); |
kevman | 0:38ceb79fef03 | 153 | i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage); |
kevman | 0:38ceb79fef03 | 154 | unlock(); |
kevman | 0:38ceb79fef03 | 155 | return 0; |
kevman | 0:38ceb79fef03 | 156 | } |
kevman | 0:38ceb79fef03 | 157 | |
kevman | 0:38ceb79fef03 | 158 | void I2C::abort_transfer(void) |
kevman | 0:38ceb79fef03 | 159 | { |
kevman | 0:38ceb79fef03 | 160 | lock(); |
kevman | 0:38ceb79fef03 | 161 | i2c_abort_asynch(&_i2c); |
kevman | 0:38ceb79fef03 | 162 | unlock_deep_sleep(); |
kevman | 0:38ceb79fef03 | 163 | unlock(); |
kevman | 0:38ceb79fef03 | 164 | } |
kevman | 0:38ceb79fef03 | 165 | |
kevman | 0:38ceb79fef03 | 166 | void I2C::irq_handler_asynch(void) |
kevman | 0:38ceb79fef03 | 167 | { |
kevman | 0:38ceb79fef03 | 168 | int event = i2c_irq_handler_asynch(&_i2c); |
kevman | 0:38ceb79fef03 | 169 | if (_callback && event) { |
kevman | 0:38ceb79fef03 | 170 | _callback.call(event); |
kevman | 0:38ceb79fef03 | 171 | } |
kevman | 0:38ceb79fef03 | 172 | if (event) { |
kevman | 0:38ceb79fef03 | 173 | unlock_deep_sleep(); |
kevman | 0:38ceb79fef03 | 174 | } |
kevman | 0:38ceb79fef03 | 175 | |
kevman | 0:38ceb79fef03 | 176 | } |
kevman | 0:38ceb79fef03 | 177 | |
kevman | 0:38ceb79fef03 | 178 | void I2C::lock_deep_sleep() |
kevman | 0:38ceb79fef03 | 179 | { |
kevman | 0:38ceb79fef03 | 180 | if (_deep_sleep_locked == false) { |
kevman | 0:38ceb79fef03 | 181 | sleep_manager_lock_deep_sleep(); |
kevman | 0:38ceb79fef03 | 182 | _deep_sleep_locked = true; |
kevman | 0:38ceb79fef03 | 183 | } |
kevman | 0:38ceb79fef03 | 184 | } |
kevman | 0:38ceb79fef03 | 185 | |
kevman | 0:38ceb79fef03 | 186 | void I2C::unlock_deep_sleep() |
kevman | 0:38ceb79fef03 | 187 | { |
kevman | 0:38ceb79fef03 | 188 | if (_deep_sleep_locked == true) { |
kevman | 0:38ceb79fef03 | 189 | sleep_manager_unlock_deep_sleep(); |
kevman | 0:38ceb79fef03 | 190 | _deep_sleep_locked = false; |
kevman | 0:38ceb79fef03 | 191 | } |
kevman | 0:38ceb79fef03 | 192 | } |
kevman | 0:38ceb79fef03 | 193 | |
kevman | 0:38ceb79fef03 | 194 | #endif |
kevman | 0:38ceb79fef03 | 195 | |
kevman | 0:38ceb79fef03 | 196 | } // namespace mbed |
kevman | 0:38ceb79fef03 | 197 | |
kevman | 0:38ceb79fef03 | 198 | #endif |