Pokitto Community Team / Pokitto_

PokittoLib with changes to lcd refresh etc.

Dependents:   Pokittris

Fork of Pokitto by Pokitto Community Team

This is a fork by user @Spinal, and is used in Pokittris for testing. Do not import this to your own program.

mbed-pokitto/common/I2C.cpp@11:02ad9c807a21, 2017-10-15 (annotated)

Committer:
spinal
Date:
Sun Oct 15 18:03:02 2017 +0000
Revision:
11:02ad9c807a21
Parent:
5:7e5c566b1760 
fixed 4color refreshRegion code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 5:7e5c566b1760 1 /* mbed Microcontroller Library
Pokitto 5:7e5c566b1760 2 * Copyright (c) 2006-2015 ARM Limited
Pokitto 5:7e5c566b1760 3 *
Pokitto 5:7e5c566b1760 4 * Licensed under the Apache License, Version 2.0 (the "License");
Pokitto 5:7e5c566b1760 5 * you may not use this file except in compliance with the License.
Pokitto 5:7e5c566b1760 6 * You may obtain a copy of the License at
Pokitto 5:7e5c566b1760 7 *
Pokitto 5:7e5c566b1760 8 * http://www.apache.org/licenses/LICENSE-2.0
Pokitto 5:7e5c566b1760 9 *
Pokitto 5:7e5c566b1760 10 * Unless required by applicable law or agreed to in writing, software
Pokitto 5:7e5c566b1760 11 * distributed under the License is distributed on an "AS IS" BASIS,
Pokitto 5:7e5c566b1760 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Pokitto 5:7e5c566b1760 13 * See the License for the specific language governing permissions and
Pokitto 5:7e5c566b1760 14 * limitations under the License.
Pokitto 5:7e5c566b1760 15 */
Pokitto 5:7e5c566b1760 16 #include "I2C.h"
Pokitto 5:7e5c566b1760 17
Pokitto 5:7e5c566b1760 18 #if DEVICE_I2C
Pokitto 5:7e5c566b1760 19
Pokitto 5:7e5c566b1760 20 namespace mbed {
Pokitto 5:7e5c566b1760 21
Pokitto 5:7e5c566b1760 22 I2C *I2C::_owner = NULL;
Pokitto 5:7e5c566b1760 23
Pokitto 5:7e5c566b1760 24 I2C::I2C(PinName sda, PinName scl) :
Pokitto 5:7e5c566b1760 25 #if DEVICE_I2C_ASYNCH
Pokitto 5:7e5c566b1760 26 _irq(this), _usage(DMA_USAGE_NEVER),
Pokitto 5:7e5c566b1760 27 #endif
Pokitto 5:7e5c566b1760 28 _i2c(), _hz(100000) {
Pokitto 5:7e5c566b1760 29 // The init function also set the frequency to 100000
Pokitto 5:7e5c566b1760 30 i2c_init(&_i2c, sda, scl);
Pokitto 5:7e5c566b1760 31
Pokitto 5:7e5c566b1760 32 // Used to avoid unnecessary frequency updates
Pokitto 5:7e5c566b1760 33 _owner = this;
Pokitto 5:7e5c566b1760 34 }
Pokitto 5:7e5c566b1760 35
Pokitto 5:7e5c566b1760 36 void I2C::frequency(int hz) {
Pokitto 5:7e5c566b1760 37 _hz = hz;
Pokitto 5:7e5c566b1760 38
Pokitto 5:7e5c566b1760 39 // We want to update the frequency even if we are already the bus owners
Pokitto 5:7e5c566b1760 40 i2c_frequency(&_i2c, _hz);
Pokitto 5:7e5c566b1760 41
Pokitto 5:7e5c566b1760 42 // Updating the frequency of the bus we become the owners of it
Pokitto 5:7e5c566b1760 43 _owner = this;
Pokitto 5:7e5c566b1760 44 }
Pokitto 5:7e5c566b1760 45
Pokitto 5:7e5c566b1760 46 void I2C::aquire() {
Pokitto 5:7e5c566b1760 47 if (_owner != this) {
Pokitto 5:7e5c566b1760 48 i2c_frequency(&_i2c, _hz);
Pokitto 5:7e5c566b1760 49 _owner = this;
Pokitto 5:7e5c566b1760 50 }
Pokitto 5:7e5c566b1760 51 }
Pokitto 5:7e5c566b1760 52
Pokitto 5:7e5c566b1760 53 // write - Master Transmitter Mode
Pokitto 5:7e5c566b1760 54 int I2C::write(int address, const char* data, int length, bool repeated) {
Pokitto 5:7e5c566b1760 55 aquire();
Pokitto 5:7e5c566b1760 56
Pokitto 5:7e5c566b1760 57 int stop = (repeated) ? 0 : 1;
Pokitto 5:7e5c566b1760 58 int written = i2c_write(&_i2c, address, data, length, stop);
Pokitto 5:7e5c566b1760 59
Pokitto 5:7e5c566b1760 60 return length != written;
Pokitto 5:7e5c566b1760 61 }
Pokitto 5:7e5c566b1760 62
Pokitto 5:7e5c566b1760 63 int I2C::write(int data) {
Pokitto 5:7e5c566b1760 64 return i2c_byte_write(&_i2c, data);
Pokitto 5:7e5c566b1760 65 }
Pokitto 5:7e5c566b1760 66
Pokitto 5:7e5c566b1760 67 // read - Master Reciever Mode
Pokitto 5:7e5c566b1760 68 int I2C::read(int address, char* data, int length, bool repeated) {
Pokitto 5:7e5c566b1760 69 aquire();
Pokitto 5:7e5c566b1760 70
Pokitto 5:7e5c566b1760 71 int stop = (repeated) ? 0 : 1;
Pokitto 5:7e5c566b1760 72 int read = i2c_read(&_i2c, address, data, length, stop);
Pokitto 5:7e5c566b1760 73
Pokitto 5:7e5c566b1760 74 return length != read;
Pokitto 5:7e5c566b1760 75 }
Pokitto 5:7e5c566b1760 76
Pokitto 5:7e5c566b1760 77 int I2C::read(int ack) {
Pokitto 5:7e5c566b1760 78 if (ack) {
Pokitto 5:7e5c566b1760 79 return i2c_byte_read(&_i2c, 0);
Pokitto 5:7e5c566b1760 80 } else {
Pokitto 5:7e5c566b1760 81 return i2c_byte_read(&_i2c, 1);
Pokitto 5:7e5c566b1760 82 }
Pokitto 5:7e5c566b1760 83 }
Pokitto 5:7e5c566b1760 84
Pokitto 5:7e5c566b1760 85 void I2C::start(void) {
Pokitto 5:7e5c566b1760 86 i2c_start(&_i2c);
Pokitto 5:7e5c566b1760 87 }
Pokitto 5:7e5c566b1760 88
Pokitto 5:7e5c566b1760 89 void I2C::stop(void) {
Pokitto 5:7e5c566b1760 90 i2c_stop(&_i2c);
Pokitto 5:7e5c566b1760 91 }
Pokitto 5:7e5c566b1760 92
Pokitto 5:7e5c566b1760 93 #if DEVICE_I2C_ASYNCH
Pokitto 5:7e5c566b1760 94
Pokitto 5:7e5c566b1760 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 5:7e5c566b1760 96 {
Pokitto 5:7e5c566b1760 97 if (i2c_active(&_i2c)) {
Pokitto 5:7e5c566b1760 98 return -1; // transaction ongoing
Pokitto 5:7e5c566b1760 99 }
Pokitto 5:7e5c566b1760 100 aquire();
Pokitto 5:7e5c566b1760 101
Pokitto 5:7e5c566b1760 102 _callback = callback;
Pokitto 5:7e5c566b1760 103 int stop = (repeated) ? 0 : 1;
Pokitto 5:7e5c566b1760 104 _irq.callback(&I2C::irq_handler_asynch);
Pokitto 5:7e5c566b1760 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
Pokitto 5:7e5c566b1760 106 return 0;
Pokitto 5:7e5c566b1760 107 }
Pokitto 5:7e5c566b1760 108
Pokitto 5:7e5c566b1760 109 void I2C::abort_transfer(void)
Pokitto 5:7e5c566b1760 110 {
Pokitto 5:7e5c566b1760 111 i2c_abort_asynch(&_i2c);
Pokitto 5:7e5c566b1760 112 }
Pokitto 5:7e5c566b1760 113
Pokitto 5:7e5c566b1760 114 void I2C::irq_handler_asynch(void)
Pokitto 5:7e5c566b1760 115 {
Pokitto 5:7e5c566b1760 116 int event = i2c_irq_handler_asynch(&_i2c);
Pokitto 5:7e5c566b1760 117 if (_callback && event) {
Pokitto 5:7e5c566b1760 118 _callback.call(event);
Pokitto 5:7e5c566b1760 119 }
Pokitto 5:7e5c566b1760 120
Pokitto 5:7e5c566b1760 121 }
Pokitto 5:7e5c566b1760 122
Pokitto 5:7e5c566b1760 123
Pokitto 5:7e5c566b1760 124 #endif
Pokitto 5:7e5c566b1760 125
Pokitto 5:7e5c566b1760 126 } // namespace mbed
Pokitto 5:7e5c566b1760 127
Pokitto 5:7e5c566b1760 128 #endif