mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Committer:
emilmont
Date:
Fri Jun 14 17:49:17 2013 +0100
Revision:
10:3bc89ef62ce7
Parent:
9:0ce32e54c9a7
Child:
13:0645d8841f51
Unify mbed library sources

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 10:3bc89ef62ce7 1 /* mbed Microcontroller Library
emilmont 10:3bc89ef62ce7 2 * Copyright (c) 2006-2013 ARM Limited
emilmont 10:3bc89ef62ce7 3 *
emilmont 10:3bc89ef62ce7 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 10:3bc89ef62ce7 5 * you may not use this file except in compliance with the License.
emilmont 10:3bc89ef62ce7 6 * You may obtain a copy of the License at
emilmont 10:3bc89ef62ce7 7 *
emilmont 10:3bc89ef62ce7 8 * http://www.apache.org/licenses/LICENSE-2.0
emilmont 10:3bc89ef62ce7 9 *
emilmont 10:3bc89ef62ce7 10 * Unless required by applicable law or agreed to in writing, software
emilmont 10:3bc89ef62ce7 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 10:3bc89ef62ce7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 10:3bc89ef62ce7 13 * See the License for the specific language governing permissions and
emilmont 10:3bc89ef62ce7 14 * limitations under the License.
emilmont 10:3bc89ef62ce7 15 */
emilmont 10:3bc89ef62ce7 16 #include "I2C.h"
emilmont 10:3bc89ef62ce7 17
emilmont 10:3bc89ef62ce7 18 #if DEVICE_I2C
emilmont 10:3bc89ef62ce7 19
emilmont 10:3bc89ef62ce7 20 namespace mbed {
emilmont 10:3bc89ef62ce7 21
emilmont 10:3bc89ef62ce7 22 I2C *I2C::_owner = NULL;
emilmont 10:3bc89ef62ce7 23
emilmont 10:3bc89ef62ce7 24 I2C::I2C(PinName sda, PinName scl) {
emilmont 10:3bc89ef62ce7 25 // The init function also set the frequency to 100000
emilmont 10:3bc89ef62ce7 26 i2c_init(&_i2c, sda, scl);
emilmont 10:3bc89ef62ce7 27 _hz = 100000;
emilmont 10:3bc89ef62ce7 28
emilmont 10:3bc89ef62ce7 29 // Used to avoid unnecessary frequency updates
emilmont 10:3bc89ef62ce7 30 _owner = this;
emilmont 10:3bc89ef62ce7 31 }
emilmont 10:3bc89ef62ce7 32
emilmont 10:3bc89ef62ce7 33 void I2C::frequency(int hz) {
emilmont 10:3bc89ef62ce7 34 _hz = hz;
emilmont 10:3bc89ef62ce7 35
emilmont 10:3bc89ef62ce7 36 // We want to update the frequency even if we are already the bus owners
emilmont 10:3bc89ef62ce7 37 i2c_frequency(&_i2c, _hz);
emilmont 10:3bc89ef62ce7 38
emilmont 10:3bc89ef62ce7 39 // Updating the frequency of the bus we become the owners of it
emilmont 10:3bc89ef62ce7 40 _owner = this;
emilmont 10:3bc89ef62ce7 41 }
emilmont 10:3bc89ef62ce7 42
emilmont 10:3bc89ef62ce7 43 void I2C::aquire() {
emilmont 10:3bc89ef62ce7 44 if (_owner != this) {
emilmont 10:3bc89ef62ce7 45 i2c_frequency(&_i2c, _hz);
emilmont 10:3bc89ef62ce7 46 _owner = this;
emilmont 10:3bc89ef62ce7 47 }
emilmont 10:3bc89ef62ce7 48 }
emilmont 10:3bc89ef62ce7 49
emilmont 10:3bc89ef62ce7 50 // write - Master Transmitter Mode
emilmont 10:3bc89ef62ce7 51 int I2C::write(int address, const char* data, int length, bool repeated) {
emilmont 10:3bc89ef62ce7 52 aquire();
emilmont 10:3bc89ef62ce7 53
emilmont 10:3bc89ef62ce7 54 int stop = (repeated) ? 0 : 1;
emilmont 10:3bc89ef62ce7 55 int retval = i2c_write(&_i2c, address, data, length, stop);
emilmont 10:3bc89ef62ce7 56
emilmont 10:3bc89ef62ce7 57 return retval;
emilmont 10:3bc89ef62ce7 58 }
emilmont 10:3bc89ef62ce7 59
emilmont 10:3bc89ef62ce7 60 int I2C::write(int data) {
emilmont 10:3bc89ef62ce7 61 return i2c_byte_write(&_i2c, data);
emilmont 10:3bc89ef62ce7 62 }
emilmont 10:3bc89ef62ce7 63
emilmont 10:3bc89ef62ce7 64 // read - Master Reciever Mode
emilmont 10:3bc89ef62ce7 65 int I2C::read(int address, char* data, int length, bool repeated) {
emilmont 10:3bc89ef62ce7 66 aquire();
emilmont 10:3bc89ef62ce7 67
emilmont 10:3bc89ef62ce7 68 int stop = (repeated) ? 0 : 1;
emilmont 10:3bc89ef62ce7 69 int retval = i2c_read(&_i2c, address, data, length, stop);
emilmont 10:3bc89ef62ce7 70
emilmont 10:3bc89ef62ce7 71 return retval;
emilmont 10:3bc89ef62ce7 72 }
emilmont 10:3bc89ef62ce7 73
emilmont 10:3bc89ef62ce7 74 int I2C::read(int ack) {
emilmont 10:3bc89ef62ce7 75 if (ack) {
emilmont 10:3bc89ef62ce7 76 return i2c_byte_read(&_i2c, 0);
emilmont 10:3bc89ef62ce7 77 } else {
emilmont 10:3bc89ef62ce7 78 return i2c_byte_read(&_i2c, 1);
emilmont 10:3bc89ef62ce7 79 }
emilmont 10:3bc89ef62ce7 80 }
emilmont 10:3bc89ef62ce7 81
emilmont 10:3bc89ef62ce7 82 void I2C::start(void) {
emilmont 10:3bc89ef62ce7 83 i2c_start(&_i2c);
emilmont 10:3bc89ef62ce7 84 }
emilmont 10:3bc89ef62ce7 85
emilmont 10:3bc89ef62ce7 86 void I2C::stop(void) {
emilmont 10:3bc89ef62ce7 87 i2c_stop(&_i2c);
emilmont 10:3bc89ef62ce7 88 }
emilmont 10:3bc89ef62ce7 89
emilmont 10:3bc89ef62ce7 90 } // namespace mbed
emilmont 10:3bc89ef62ce7 91
emilmont 10:3bc89ef62ce7 92 #endif