spinal cord / PokittoLib_

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

mbed-pokitto/common/I2C.cpp@64:6e6c6c2b664e, 2018-11-18 (annotated)

Committer:
spinal
Date:
Sun Nov 18 15:47:54 2018 +0000
Revision:
64:6e6c6c2b664e
Parent:
5:ea7377f3d1af 
added fix for directrectangle()

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