Test code for Grove Node BLE
Dependencies: BLE_API nRF51822
Fork of BLE_LoopbackUART by
I2C.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #include "I2C.h" 00017 00018 #if DEVICE_I2C 00019 00020 namespace mbed { 00021 00022 I2C *I2C::_owner = NULL; 00023 00024 I2C::I2C(PinName sda, PinName scl) : _i2c(), _hz(100000) { 00025 // The init function also set the frequency to 100000 00026 i2c_init(&_i2c, sda, scl); 00027 00028 // Used to avoid unnecessary frequency updates 00029 _owner = this; 00030 } 00031 00032 void I2C::frequency(int hz) { 00033 _hz = hz; 00034 00035 // We want to update the frequency even if we are already the bus owners 00036 i2c_frequency(&_i2c, _hz); 00037 00038 // Updating the frequency of the bus we become the owners of it 00039 _owner = this; 00040 } 00041 00042 void I2C::aquire() { 00043 if (_owner != this) { 00044 i2c_frequency(&_i2c, _hz); 00045 _owner = this; 00046 } 00047 } 00048 00049 // write - Master Transmitter Mode 00050 int I2C::write(int address, const char* data, int length, bool repeated) { 00051 aquire(); 00052 00053 int stop = (repeated) ? 0 : 1; 00054 int written = i2c_write(&_i2c, address, data, length, stop); 00055 00056 return length != written; 00057 } 00058 00059 int I2C::write(int data) { 00060 return i2c_byte_write(&_i2c, data); 00061 } 00062 00063 // read - Master Reciever Mode 00064 int I2C::read(int address, char* data, int length, bool repeated) { 00065 aquire(); 00066 00067 int stop = (repeated) ? 0 : 1; 00068 int read = i2c_read(&_i2c, address, data, length, stop); 00069 00070 return length != read; 00071 } 00072 00073 int I2C::read(int ack) { 00074 if (ack) { 00075 return i2c_byte_read(&_i2c, 0); 00076 } else { 00077 return i2c_byte_read(&_i2c, 1); 00078 } 00079 } 00080 00081 void I2C::start(void) { 00082 i2c_start(&_i2c); 00083 } 00084 00085 void I2C::stop(void) { 00086 i2c_stop(&_i2c); 00087 } 00088 00089 } // namespace mbed 00090 00091 #endif
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