Milen Pavlov / XRange_mbed_src

Mbed SDK for XRange SX1272 LoRa module

Dependents:   XRangePingPong XRange-LoRaWAN-lmic-app lora-transceiver

SX1272 LoRa RF module

https://www.netblocks.eu/xrange-sx1272-lora-datasheet/

common/I2C.cpp@336:1e18a06a987b, 2015-01-15 (annotated)

Committer:
dudmuck
Date:
Thu Jan 15 02:25:40 2015 +0000
Revision:
336:1e18a06a987b
updated to rev443 of official mbed-src

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dudmuck 336:1e18a06a987b 1 /* mbed Microcontroller Library
dudmuck 336:1e18a06a987b 2 * Copyright (c) 2006-2013 ARM Limited
dudmuck 336:1e18a06a987b 3 *
dudmuck 336:1e18a06a987b 4 * Licensed under the Apache License, Version 2.0 (the "License");
dudmuck 336:1e18a06a987b 5 * you may not use this file except in compliance with the License.
dudmuck 336:1e18a06a987b 6 * You may obtain a copy of the License at
dudmuck 336:1e18a06a987b 7 *
dudmuck 336:1e18a06a987b 8 * http://www.apache.org/licenses/LICENSE-2.0
dudmuck 336:1e18a06a987b 9 *
dudmuck 336:1e18a06a987b 10 * Unless required by applicable law or agreed to in writing, software
dudmuck 336:1e18a06a987b 11 * distributed under the License is distributed on an "AS IS" BASIS,
dudmuck 336:1e18a06a987b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
dudmuck 336:1e18a06a987b 13 * See the License for the specific language governing permissions and
dudmuck 336:1e18a06a987b 14 * limitations under the License.
dudmuck 336:1e18a06a987b 15 */
dudmuck 336:1e18a06a987b 16 #include "I2C.h"
dudmuck 336:1e18a06a987b 17
dudmuck 336:1e18a06a987b 18 #if DEVICE_I2C
dudmuck 336:1e18a06a987b 19
dudmuck 336:1e18a06a987b 20 namespace mbed {
dudmuck 336:1e18a06a987b 21
dudmuck 336:1e18a06a987b 22 I2C *I2C::_owner = NULL;
dudmuck 336:1e18a06a987b 23
dudmuck 336:1e18a06a987b 24 I2C::I2C(PinName sda, PinName scl) : _i2c(), _hz(100000) {
dudmuck 336:1e18a06a987b 25 // The init function also set the frequency to 100000
dudmuck 336:1e18a06a987b 26 i2c_init(&_i2c, sda, scl);
dudmuck 336:1e18a06a987b 27
dudmuck 336:1e18a06a987b 28 // Used to avoid unnecessary frequency updates
dudmuck 336:1e18a06a987b 29 _owner = this;
dudmuck 336:1e18a06a987b 30 }
dudmuck 336:1e18a06a987b 31
dudmuck 336:1e18a06a987b 32 void I2C::frequency(int hz) {
dudmuck 336:1e18a06a987b 33 _hz = hz;
dudmuck 336:1e18a06a987b 34
dudmuck 336:1e18a06a987b 35 // We want to update the frequency even if we are already the bus owners
dudmuck 336:1e18a06a987b 36 i2c_frequency(&_i2c, _hz);
dudmuck 336:1e18a06a987b 37
dudmuck 336:1e18a06a987b 38 // Updating the frequency of the bus we become the owners of it
dudmuck 336:1e18a06a987b 39 _owner = this;
dudmuck 336:1e18a06a987b 40 }
dudmuck 336:1e18a06a987b 41
dudmuck 336:1e18a06a987b 42 void I2C::aquire() {
dudmuck 336:1e18a06a987b 43 if (_owner != this) {
dudmuck 336:1e18a06a987b 44 i2c_frequency(&_i2c, _hz);
dudmuck 336:1e18a06a987b 45 _owner = this;
dudmuck 336:1e18a06a987b 46 }
dudmuck 336:1e18a06a987b 47 }
dudmuck 336:1e18a06a987b 48
dudmuck 336:1e18a06a987b 49 // write - Master Transmitter Mode
dudmuck 336:1e18a06a987b 50 int I2C::write(int address, const char* data, int length, bool repeated) {
dudmuck 336:1e18a06a987b 51 aquire();
dudmuck 336:1e18a06a987b 52
dudmuck 336:1e18a06a987b 53 int stop = (repeated) ? 0 : 1;
dudmuck 336:1e18a06a987b 54 int written = i2c_write(&_i2c, address, data, length, stop);
dudmuck 336:1e18a06a987b 55
dudmuck 336:1e18a06a987b 56 return length != written;
dudmuck 336:1e18a06a987b 57 }
dudmuck 336:1e18a06a987b 58
dudmuck 336:1e18a06a987b 59 int I2C::write(int data) {
dudmuck 336:1e18a06a987b 60 return i2c_byte_write(&_i2c, data);
dudmuck 336:1e18a06a987b 61 }
dudmuck 336:1e18a06a987b 62
dudmuck 336:1e18a06a987b 63 // read - Master Reciever Mode
dudmuck 336:1e18a06a987b 64 int I2C::read(int address, char* data, int length, bool repeated) {
dudmuck 336:1e18a06a987b 65 aquire();
dudmuck 336:1e18a06a987b 66
dudmuck 336:1e18a06a987b 67 int stop = (repeated) ? 0 : 1;
dudmuck 336:1e18a06a987b 68 int read = i2c_read(&_i2c, address, data, length, stop);
dudmuck 336:1e18a06a987b 69
dudmuck 336:1e18a06a987b 70 return length != read;
dudmuck 336:1e18a06a987b 71 }
dudmuck 336:1e18a06a987b 72
dudmuck 336:1e18a06a987b 73 int I2C::read(int ack) {
dudmuck 336:1e18a06a987b 74 if (ack) {
dudmuck 336:1e18a06a987b 75 return i2c_byte_read(&_i2c, 0);
dudmuck 336:1e18a06a987b 76 } else {
dudmuck 336:1e18a06a987b 77 return i2c_byte_read(&_i2c, 1);
dudmuck 336:1e18a06a987b 78 }
dudmuck 336:1e18a06a987b 79 }
dudmuck 336:1e18a06a987b 80
dudmuck 336:1e18a06a987b 81 void I2C::start(void) {
dudmuck 336:1e18a06a987b 82 i2c_start(&_i2c);
dudmuck 336:1e18a06a987b 83 }
dudmuck 336:1e18a06a987b 84
dudmuck 336:1e18a06a987b 85 void I2C::stop(void) {
dudmuck 336:1e18a06a987b 86 i2c_stop(&_i2c);
dudmuck 336:1e18a06a987b 87 }
dudmuck 336:1e18a06a987b 88
dudmuck 336:1e18a06a987b 89 } // namespace mbed
dudmuck 336:1e18a06a987b 90
dudmuck 336:1e18a06a987b 91 #endif