mbed library sources(for async_print)
Fork of mbed-src by
cpp/I2C.cpp@0:fd0d7bdfcdc2, 2012-11-20 (annotated)
- Committer:
- mbed_official
- Date:
- Tue Nov 20 17:24:08 2012 +0000
- Revision:
- 0:fd0d7bdfcdc2
- Child:
- 2:143cac498751
mbed sources
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 0:fd0d7bdfcdc2 | 1 | /* mbed Microcontroller Library |
mbed_official | 0:fd0d7bdfcdc2 | 2 | * Copyright (c) 2006-2012 ARM Limited |
mbed_official | 0:fd0d7bdfcdc2 | 3 | * |
mbed_official | 0:fd0d7bdfcdc2 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
mbed_official | 0:fd0d7bdfcdc2 | 5 | * of this software and associated documentation files (the "Software"), to deal |
mbed_official | 0:fd0d7bdfcdc2 | 6 | * in the Software without restriction, including without limitation the rights |
mbed_official | 0:fd0d7bdfcdc2 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
mbed_official | 0:fd0d7bdfcdc2 | 8 | * copies of the Software, and to permit persons to whom the Software is |
mbed_official | 0:fd0d7bdfcdc2 | 9 | * furnished to do so, subject to the following conditions: |
mbed_official | 0:fd0d7bdfcdc2 | 10 | * |
mbed_official | 0:fd0d7bdfcdc2 | 11 | * The above copyright notice and this permission notice shall be included in |
mbed_official | 0:fd0d7bdfcdc2 | 12 | * all copies or substantial portions of the Software. |
mbed_official | 0:fd0d7bdfcdc2 | 13 | * |
mbed_official | 0:fd0d7bdfcdc2 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
mbed_official | 0:fd0d7bdfcdc2 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
mbed_official | 0:fd0d7bdfcdc2 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
mbed_official | 0:fd0d7bdfcdc2 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
mbed_official | 0:fd0d7bdfcdc2 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
mbed_official | 0:fd0d7bdfcdc2 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
mbed_official | 0:fd0d7bdfcdc2 | 20 | * SOFTWARE. |
mbed_official | 0:fd0d7bdfcdc2 | 21 | */ |
mbed_official | 0:fd0d7bdfcdc2 | 22 | #include "I2C.h" |
mbed_official | 0:fd0d7bdfcdc2 | 23 | |
mbed_official | 0:fd0d7bdfcdc2 | 24 | #if DEVICE_I2C |
mbed_official | 0:fd0d7bdfcdc2 | 25 | |
mbed_official | 0:fd0d7bdfcdc2 | 26 | namespace mbed { |
mbed_official | 0:fd0d7bdfcdc2 | 27 | |
mbed_official | 0:fd0d7bdfcdc2 | 28 | I2C *I2C::_owner = NULL; |
mbed_official | 0:fd0d7bdfcdc2 | 29 | |
mbed_official | 0:fd0d7bdfcdc2 | 30 | I2C::I2C(PinName sda, PinName scl) { |
mbed_official | 0:fd0d7bdfcdc2 | 31 | // The init function also set the frequency to 100000 |
mbed_official | 0:fd0d7bdfcdc2 | 32 | i2c_init(&_i2c, sda, scl); |
mbed_official | 0:fd0d7bdfcdc2 | 33 | _hz = 100000; |
mbed_official | 0:fd0d7bdfcdc2 | 34 | |
mbed_official | 0:fd0d7bdfcdc2 | 35 | // Used to avoid unnecessary frequency updates |
mbed_official | 0:fd0d7bdfcdc2 | 36 | _owner = this; |
mbed_official | 0:fd0d7bdfcdc2 | 37 | } |
mbed_official | 0:fd0d7bdfcdc2 | 38 | |
mbed_official | 0:fd0d7bdfcdc2 | 39 | void I2C::frequency(int hz) { |
mbed_official | 0:fd0d7bdfcdc2 | 40 | _hz = hz; |
mbed_official | 0:fd0d7bdfcdc2 | 41 | |
mbed_official | 0:fd0d7bdfcdc2 | 42 | // We want to update the frequency even if we are already the bus owners |
mbed_official | 0:fd0d7bdfcdc2 | 43 | i2c_frequency(&_i2c, _hz); |
mbed_official | 0:fd0d7bdfcdc2 | 44 | |
mbed_official | 0:fd0d7bdfcdc2 | 45 | // Updating the frequency of the bus we become the owners of it |
mbed_official | 0:fd0d7bdfcdc2 | 46 | _owner = this; |
mbed_official | 0:fd0d7bdfcdc2 | 47 | } |
mbed_official | 0:fd0d7bdfcdc2 | 48 | |
mbed_official | 0:fd0d7bdfcdc2 | 49 | void I2C::aquire() { |
mbed_official | 0:fd0d7bdfcdc2 | 50 | if (_owner != this) { |
mbed_official | 0:fd0d7bdfcdc2 | 51 | i2c_frequency(&_i2c, _hz); |
mbed_official | 0:fd0d7bdfcdc2 | 52 | _owner = this; |
mbed_official | 0:fd0d7bdfcdc2 | 53 | } |
mbed_official | 0:fd0d7bdfcdc2 | 54 | } |
mbed_official | 0:fd0d7bdfcdc2 | 55 | |
mbed_official | 0:fd0d7bdfcdc2 | 56 | // write - Master Transmitter Mode |
mbed_official | 0:fd0d7bdfcdc2 | 57 | int I2C::write(int address, const char* data, int length, bool repeated) { |
mbed_official | 0:fd0d7bdfcdc2 | 58 | aquire(); |
mbed_official | 0:fd0d7bdfcdc2 | 59 | |
mbed_official | 0:fd0d7bdfcdc2 | 60 | int stop = (repeated) ? 0 : 1; |
mbed_official | 0:fd0d7bdfcdc2 | 61 | int retval = i2c_write(&_i2c, address, data, length, stop); |
mbed_official | 0:fd0d7bdfcdc2 | 62 | |
mbed_official | 0:fd0d7bdfcdc2 | 63 | return retval; |
mbed_official | 0:fd0d7bdfcdc2 | 64 | } |
mbed_official | 0:fd0d7bdfcdc2 | 65 | |
mbed_official | 0:fd0d7bdfcdc2 | 66 | int I2C::write(int data) { |
mbed_official | 0:fd0d7bdfcdc2 | 67 | return i2c_byte_write(&_i2c, data); |
mbed_official | 0:fd0d7bdfcdc2 | 68 | } |
mbed_official | 0:fd0d7bdfcdc2 | 69 | |
mbed_official | 0:fd0d7bdfcdc2 | 70 | // read - Master Reciever Mode |
mbed_official | 0:fd0d7bdfcdc2 | 71 | int I2C::read(int address, char* data, int length, bool repeated) { |
mbed_official | 0:fd0d7bdfcdc2 | 72 | aquire(); |
mbed_official | 0:fd0d7bdfcdc2 | 73 | |
mbed_official | 0:fd0d7bdfcdc2 | 74 | int stop = (repeated) ? 0 : 1; |
mbed_official | 0:fd0d7bdfcdc2 | 75 | int retval = i2c_read(&_i2c, address, data, length, stop); |
mbed_official | 0:fd0d7bdfcdc2 | 76 | |
mbed_official | 0:fd0d7bdfcdc2 | 77 | return retval; |
mbed_official | 0:fd0d7bdfcdc2 | 78 | } |
mbed_official | 0:fd0d7bdfcdc2 | 79 | |
mbed_official | 0:fd0d7bdfcdc2 | 80 | int I2C::read(int ack) { |
mbed_official | 0:fd0d7bdfcdc2 | 81 | if (ack) { |
mbed_official | 0:fd0d7bdfcdc2 | 82 | return i2c_byte_read(&_i2c, 0); |
mbed_official | 0:fd0d7bdfcdc2 | 83 | } else { |
mbed_official | 0:fd0d7bdfcdc2 | 84 | return i2c_byte_read(&_i2c, 1); |
mbed_official | 0:fd0d7bdfcdc2 | 85 | } |
mbed_official | 0:fd0d7bdfcdc2 | 86 | } |
mbed_official | 0:fd0d7bdfcdc2 | 87 | |
mbed_official | 0:fd0d7bdfcdc2 | 88 | void I2C::start(void) { |
mbed_official | 0:fd0d7bdfcdc2 | 89 | i2c_start(&_i2c); |
mbed_official | 0:fd0d7bdfcdc2 | 90 | } |
mbed_official | 0:fd0d7bdfcdc2 | 91 | |
mbed_official | 0:fd0d7bdfcdc2 | 92 | void I2C::stop(void) { |
mbed_official | 0:fd0d7bdfcdc2 | 93 | i2c_stop(&_i2c); |
mbed_official | 0:fd0d7bdfcdc2 | 94 | } |
mbed_official | 0:fd0d7bdfcdc2 | 95 | |
mbed_official | 0:fd0d7bdfcdc2 | 96 | } // namespace mbed |
mbed_official | 0:fd0d7bdfcdc2 | 97 | |
mbed_official | 0:fd0d7bdfcdc2 | 98 | #endif |