dev01 Brautlecht / mbed-STM32F030F4

Blink, remove compiler errors

Dependents:   STM32F031_Blink_Aug17

Fork of mbed-STM32F030F4 by Nothing Special

common/I2C.cpp@0:38ccae254a29, 2014-10-18 (annotated)

Committer:
mega64
Date:
Sat Oct 18 02:40:17 2014 +0000
Revision:
0:38ccae254a29
only for STM32F030F4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mega64 0:38ccae254a29 1 /* mbed Microcontroller Library
mega64 0:38ccae254a29 2 * Copyright (c) 2006-2013 ARM Limited
mega64 0:38ccae254a29 3 *
mega64 0:38ccae254a29 4 * Licensed under the Apache License, Version 2.0 (the "License");
mega64 0:38ccae254a29 5 * you may not use this file except in compliance with the License.
mega64 0:38ccae254a29 6 * You may obtain a copy of the License at
mega64 0:38ccae254a29 7 *
mega64 0:38ccae254a29 8 * http://www.apache.org/licenses/LICENSE-2.0
mega64 0:38ccae254a29 9 *
mega64 0:38ccae254a29 10 * Unless required by applicable law or agreed to in writing, software
mega64 0:38ccae254a29 11 * distributed under the License is distributed on an "AS IS" BASIS,
mega64 0:38ccae254a29 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mega64 0:38ccae254a29 13 * See the License for the specific language governing permissions and
mega64 0:38ccae254a29 14 * limitations under the License.
mega64 0:38ccae254a29 15 */
mega64 0:38ccae254a29 16 #include "I2C.h"
mega64 0:38ccae254a29 17
mega64 0:38ccae254a29 18 #if DEVICE_I2C
mega64 0:38ccae254a29 19
mega64 0:38ccae254a29 20 namespace mbed {
mega64 0:38ccae254a29 21
mega64 0:38ccae254a29 22 I2C *I2C::_owner = NULL;
mega64 0:38ccae254a29 23
mega64 0:38ccae254a29 24 I2C::I2C(PinName sda, PinName scl) : _i2c(), _hz(100000) {
mega64 0:38ccae254a29 25 // The init function also set the frequency to 100000
mega64 0:38ccae254a29 26 i2c_init(&_i2c, sda, scl);
mega64 0:38ccae254a29 27
mega64 0:38ccae254a29 28 // Used to avoid unnecessary frequency updates
mega64 0:38ccae254a29 29 _owner = this;
mega64 0:38ccae254a29 30 }
mega64 0:38ccae254a29 31
mega64 0:38ccae254a29 32 void I2C::frequency(int hz) {
mega64 0:38ccae254a29 33 _hz = hz;
mega64 0:38ccae254a29 34
mega64 0:38ccae254a29 35 // We want to update the frequency even if we are already the bus owners
mega64 0:38ccae254a29 36 i2c_frequency(&_i2c, _hz);
mega64 0:38ccae254a29 37
mega64 0:38ccae254a29 38 // Updating the frequency of the bus we become the owners of it
mega64 0:38ccae254a29 39 _owner = this;
mega64 0:38ccae254a29 40 }
mega64 0:38ccae254a29 41
mega64 0:38ccae254a29 42 void I2C::aquire() {
mega64 0:38ccae254a29 43 if (_owner != this) {
mega64 0:38ccae254a29 44 i2c_frequency(&_i2c, _hz);
mega64 0:38ccae254a29 45 _owner = this;
mega64 0:38ccae254a29 46 }
mega64 0:38ccae254a29 47 }
mega64 0:38ccae254a29 48
mega64 0:38ccae254a29 49 // write - Master Transmitter Mode
mega64 0:38ccae254a29 50 int I2C::write(int address, const char* data, int length, bool repeated) {
mega64 0:38ccae254a29 51 aquire();
mega64 0:38ccae254a29 52
mega64 0:38ccae254a29 53 int stop = (repeated) ? 0 : 1;
mega64 0:38ccae254a29 54 int written = i2c_write(&_i2c, address, data, length, stop);
mega64 0:38ccae254a29 55
mega64 0:38ccae254a29 56 return length != written;
mega64 0:38ccae254a29 57 }
mega64 0:38ccae254a29 58
mega64 0:38ccae254a29 59 int I2C::write(int data) {
mega64 0:38ccae254a29 60 return i2c_byte_write(&_i2c, data);
mega64 0:38ccae254a29 61 }
mega64 0:38ccae254a29 62
mega64 0:38ccae254a29 63 // read - Master Reciever Mode
mega64 0:38ccae254a29 64 int I2C::read(int address, char* data, int length, bool repeated) {
mega64 0:38ccae254a29 65 aquire();
mega64 0:38ccae254a29 66
mega64 0:38ccae254a29 67 int stop = (repeated) ? 0 : 1;
mega64 0:38ccae254a29 68 int read = i2c_read(&_i2c, address, data, length, stop);
mega64 0:38ccae254a29 69
mega64 0:38ccae254a29 70 return length != read;
mega64 0:38ccae254a29 71 }
mega64 0:38ccae254a29 72
mega64 0:38ccae254a29 73 int I2C::read(int ack) {
mega64 0:38ccae254a29 74 if (ack) {
mega64 0:38ccae254a29 75 return i2c_byte_read(&_i2c, 0);
mega64 0:38ccae254a29 76 } else {
mega64 0:38ccae254a29 77 return i2c_byte_read(&_i2c, 1);
mega64 0:38ccae254a29 78 }
mega64 0:38ccae254a29 79 }
mega64 0:38ccae254a29 80
mega64 0:38ccae254a29 81 void I2C::start(void) {
mega64 0:38ccae254a29 82 i2c_start(&_i2c);
mega64 0:38ccae254a29 83 }
mega64 0:38ccae254a29 84
mega64 0:38ccae254a29 85 void I2C::stop(void) {
mega64 0:38ccae254a29 86 i2c_stop(&_i2c);
mega64 0:38ccae254a29 87 }
mega64 0:38ccae254a29 88
mega64 0:38ccae254a29 89 } // namespace mbed
mega64 0:38ccae254a29 90
mega64 0:38ccae254a29 91 #endif