Jonne Valola / PokittoLib Featured

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

Dependents:   YATTT sd_map_test cPong SnowDemo ... more

PokittoLib

Library for programming Pokitto hardware

How to Use

  1. Import this library to online compiler (see button "import" on the right hand side
  2. DO NOT import mbed-src anymore, a better version is now included inside PokittoLib
  3. Change My_settings.h according to your project
  4. Start coding!

mbed-pokitto/common/I2C.cpp@71:531419862202, 2019-12-25 (annotated)

Committer:
Pokitto
Date:
Wed Dec 25 23:59:52 2019 +0000
Revision:
71:531419862202
Parent:
5:ea7377f3d1af 
Changed Mode2 C++ refresh code (graphical errors)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 5:ea7377f3d1af 1 /* mbed Microcontroller Library
Pokitto 5:ea7377f3d1af 2 * Copyright (c) 2006-2015 ARM Limited
Pokitto 5:ea7377f3d1af 3 *
Pokitto 5:ea7377f3d1af 4 * Licensed under the Apache License, Version 2.0 (the "License");
Pokitto 5:ea7377f3d1af 5 * you may not use this file except in compliance with the License.
Pokitto 5:ea7377f3d1af 6 * You may obtain a copy of the License at
Pokitto 5:ea7377f3d1af 7 *
Pokitto 5:ea7377f3d1af 8 * http://www.apache.org/licenses/LICENSE-2.0
Pokitto 5:ea7377f3d1af 9 *
Pokitto 5:ea7377f3d1af 10 * Unless required by applicable law or agreed to in writing, software
Pokitto 5:ea7377f3d1af 11 * distributed under the License is distributed on an "AS IS" BASIS,
Pokitto 5:ea7377f3d1af 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Pokitto 5:ea7377f3d1af 13 * See the License for the specific language governing permissions and
Pokitto 5:ea7377f3d1af 14 * limitations under the License.
Pokitto 5:ea7377f3d1af 15 */
Pokitto 5:ea7377f3d1af 16 #include "I2C.h"
Pokitto 5:ea7377f3d1af 17
Pokitto 5:ea7377f3d1af 18 #if DEVICE_I2C
Pokitto 5:ea7377f3d1af 19
Pokitto 5:ea7377f3d1af 20 namespace mbed {
Pokitto 5:ea7377f3d1af 21
Pokitto 5:ea7377f3d1af 22 I2C *I2C::_owner = NULL;
Pokitto 5:ea7377f3d1af 23
Pokitto 5:ea7377f3d1af 24 I2C::I2C(PinName sda, PinName scl) :
Pokitto 5:ea7377f3d1af 25 #if DEVICE_I2C_ASYNCH
Pokitto 5:ea7377f3d1af 26 _irq(this), _usage(DMA_USAGE_NEVER),
Pokitto 5:ea7377f3d1af 27 #endif
Pokitto 5:ea7377f3d1af 28 _i2c(), _hz(100000) {
Pokitto 5:ea7377f3d1af 29 // The init function also set the frequency to 100000
Pokitto 5:ea7377f3d1af 30 i2c_init(&_i2c, sda, scl);
Pokitto 5:ea7377f3d1af 31
Pokitto 5:ea7377f3d1af 32 // Used to avoid unnecessary frequency updates
Pokitto 5:ea7377f3d1af 33 _owner = this;
Pokitto 5:ea7377f3d1af 34 }
Pokitto 5:ea7377f3d1af 35
Pokitto 5:ea7377f3d1af 36 void I2C::frequency(int hz) {
Pokitto 5:ea7377f3d1af 37 _hz = hz;
Pokitto 5:ea7377f3d1af 38
Pokitto 5:ea7377f3d1af 39 // We want to update the frequency even if we are already the bus owners
Pokitto 5:ea7377f3d1af 40 i2c_frequency(&_i2c, _hz);
Pokitto 5:ea7377f3d1af 41
Pokitto 5:ea7377f3d1af 42 // Updating the frequency of the bus we become the owners of it
Pokitto 5:ea7377f3d1af 43 _owner = this;
Pokitto 5:ea7377f3d1af 44 }
Pokitto 5:ea7377f3d1af 45
Pokitto 5:ea7377f3d1af 46 void I2C::aquire() {
Pokitto 5:ea7377f3d1af 47 if (_owner != this) {
Pokitto 5:ea7377f3d1af 48 i2c_frequency(&_i2c, _hz);
Pokitto 5:ea7377f3d1af 49 _owner = this;
Pokitto 5:ea7377f3d1af 50 }
Pokitto 5:ea7377f3d1af 51 }
Pokitto 5:ea7377f3d1af 52
Pokitto 5:ea7377f3d1af 53 // write - Master Transmitter Mode
Pokitto 5:ea7377f3d1af 54 int I2C::write(int address, const char* data, int length, bool repeated) {
Pokitto 5:ea7377f3d1af 55 aquire();
Pokitto 5:ea7377f3d1af 56
Pokitto 5:ea7377f3d1af 57 int stop = (repeated) ? 0 : 1;
Pokitto 5:ea7377f3d1af 58 int written = i2c_write(&_i2c, address, data, length, stop);
Pokitto 5:ea7377f3d1af 59
Pokitto 5:ea7377f3d1af 60 return length != written;
Pokitto 5:ea7377f3d1af 61 }
Pokitto 5:ea7377f3d1af 62
Pokitto 5:ea7377f3d1af 63 int I2C::write(int data) {
Pokitto 5:ea7377f3d1af 64 return i2c_byte_write(&_i2c, data);
Pokitto 5:ea7377f3d1af 65 }
Pokitto 5:ea7377f3d1af 66
Pokitto 5:ea7377f3d1af 67 // read - Master Reciever Mode
Pokitto 5:ea7377f3d1af 68 int I2C::read(int address, char* data, int length, bool repeated) {
Pokitto 5:ea7377f3d1af 69 aquire();
Pokitto 5:ea7377f3d1af 70
Pokitto 5:ea7377f3d1af 71 int stop = (repeated) ? 0 : 1;
Pokitto 5:ea7377f3d1af 72 int read = i2c_read(&_i2c, address, data, length, stop);
Pokitto 5:ea7377f3d1af 73
Pokitto 5:ea7377f3d1af 74 return length != read;
Pokitto 5:ea7377f3d1af 75 }
Pokitto 5:ea7377f3d1af 76
Pokitto 5:ea7377f3d1af 77 int I2C::read(int ack) {
Pokitto 5:ea7377f3d1af 78 if (ack) {
Pokitto 5:ea7377f3d1af 79 return i2c_byte_read(&_i2c, 0);
Pokitto 5:ea7377f3d1af 80 } else {
Pokitto 5:ea7377f3d1af 81 return i2c_byte_read(&_i2c, 1);
Pokitto 5:ea7377f3d1af 82 }
Pokitto 5:ea7377f3d1af 83 }
Pokitto 5:ea7377f3d1af 84
Pokitto 5:ea7377f3d1af 85 void I2C::start(void) {
Pokitto 5:ea7377f3d1af 86 i2c_start(&_i2c);
Pokitto 5:ea7377f3d1af 87 }
Pokitto 5:ea7377f3d1af 88
Pokitto 5:ea7377f3d1af 89 void I2C::stop(void) {
Pokitto 5:ea7377f3d1af 90 i2c_stop(&_i2c);
Pokitto 5:ea7377f3d1af 91 }
Pokitto 5:ea7377f3d1af 92
Pokitto 5:ea7377f3d1af 93 #if DEVICE_I2C_ASYNCH
Pokitto 5:ea7377f3d1af 94
Pokitto 5:ea7377f3d1af 95 int I2C::transfer(int address, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, const event_callback_t& callback, int event, bool repeated)
Pokitto 5:ea7377f3d1af 96 {
Pokitto 5:ea7377f3d1af 97 if (i2c_active(&_i2c)) {
Pokitto 5:ea7377f3d1af 98 return -1; // transaction ongoing
Pokitto 5:ea7377f3d1af 99 }
Pokitto 5:ea7377f3d1af 100 aquire();
Pokitto 5:ea7377f3d1af 101
Pokitto 5:ea7377f3d1af 102 _callback = callback;
Pokitto 5:ea7377f3d1af 103 int stop = (repeated) ? 0 : 1;
Pokitto 5:ea7377f3d1af 104 _irq.callback(&I2C::irq_handler_asynch);
Pokitto 5:ea7377f3d1af 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
Pokitto 5:ea7377f3d1af 106 return 0;
Pokitto 5:ea7377f3d1af 107 }
Pokitto 5:ea7377f3d1af 108
Pokitto 5:ea7377f3d1af 109 void I2C::abort_transfer(void)
Pokitto 5:ea7377f3d1af 110 {
Pokitto 5:ea7377f3d1af 111 i2c_abort_asynch(&_i2c);
Pokitto 5:ea7377f3d1af 112 }
Pokitto 5:ea7377f3d1af 113
Pokitto 5:ea7377f3d1af 114 void I2C::irq_handler_asynch(void)
Pokitto 5:ea7377f3d1af 115 {
Pokitto 5:ea7377f3d1af 116 int event = i2c_irq_handler_asynch(&_i2c);
Pokitto 5:ea7377f3d1af 117 if (_callback && event) {
Pokitto 5:ea7377f3d1af 118 _callback.call(event);
Pokitto 5:ea7377f3d1af 119 }
Pokitto 5:ea7377f3d1af 120
Pokitto 5:ea7377f3d1af 121 }
Pokitto 5:ea7377f3d1af 122
Pokitto 5:ea7377f3d1af 123
Pokitto 5:ea7377f3d1af 124 #endif
Pokitto 5:ea7377f3d1af 125
Pokitto 5:ea7377f3d1af 126 } // namespace mbed
Pokitto 5:ea7377f3d1af 127
Pokitto 5:ea7377f3d1af 128 #endif