philippe s. / mbed-dev

mbed library sources. Supersedes mbed-src. Fixes analogIn and analogOut problems for TARGET_STM32F3. Tested on NUCLEO-F303K8, using 3 analogout and 7 analogin channels simultaneously. Added ability for STM32F334R8 and STM32F303K8 to use all three channels of DAC simultaneously. https://developer.mbed.org/users/StevieWray/code/mbed-dev/ Added ability for TARGET_STM32F3 to use more than one ADC simultaneously. https://developer.mbed.org/questions/67997/NUCLEO-F303K8ADC/

Fork of mbed-dev by mbed official

common/I2C.cpp@70:b3a5af880266, 2016-02-23 (annotated)

Committer:
neurofun
Date:
Tue Feb 23 21:59:35 2016 +0000
Revision:
70:b3a5af880266
Parent:
0:9b334a45a8ff 
Edited DAC routines to allow for the simultaneous use of three channels from two DACs as seen on the STM32F334R8 and STM32F303K8. Edited ADC routines to allow for the simultaneous use of more than one ADC.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2015 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "I2C.h"
bogdanm 0:9b334a45a8ff 17
bogdanm 0:9b334a45a8ff 18 #if DEVICE_I2C
bogdanm 0:9b334a45a8ff 19
bogdanm 0:9b334a45a8ff 20 namespace mbed {
bogdanm 0:9b334a45a8ff 21
bogdanm 0:9b334a45a8ff 22 I2C *I2C::_owner = NULL;
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 I2C::I2C(PinName sda, PinName scl) :
bogdanm 0:9b334a45a8ff 25 #if DEVICE_I2C_ASYNCH
bogdanm 0:9b334a45a8ff 26 _irq(this), _usage(DMA_USAGE_NEVER),
bogdanm 0:9b334a45a8ff 27 #endif
bogdanm 0:9b334a45a8ff 28 _i2c(), _hz(100000) {
bogdanm 0:9b334a45a8ff 29 // The init function also set the frequency to 100000
bogdanm 0:9b334a45a8ff 30 i2c_init(&_i2c, sda, scl);
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 // Used to avoid unnecessary frequency updates
bogdanm 0:9b334a45a8ff 33 _owner = this;
bogdanm 0:9b334a45a8ff 34 }
bogdanm 0:9b334a45a8ff 35
bogdanm 0:9b334a45a8ff 36 void I2C::frequency(int hz) {
bogdanm 0:9b334a45a8ff 37 _hz = hz;
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 // We want to update the frequency even if we are already the bus owners
bogdanm 0:9b334a45a8ff 40 i2c_frequency(&_i2c, _hz);
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 // Updating the frequency of the bus we become the owners of it
bogdanm 0:9b334a45a8ff 43 _owner = this;
bogdanm 0:9b334a45a8ff 44 }
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 void I2C::aquire() {
bogdanm 0:9b334a45a8ff 47 if (_owner != this) {
bogdanm 0:9b334a45a8ff 48 i2c_frequency(&_i2c, _hz);
bogdanm 0:9b334a45a8ff 49 _owner = this;
bogdanm 0:9b334a45a8ff 50 }
bogdanm 0:9b334a45a8ff 51 }
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 // write - Master Transmitter Mode
bogdanm 0:9b334a45a8ff 54 int I2C::write(int address, const char* data, int length, bool repeated) {
bogdanm 0:9b334a45a8ff 55 aquire();
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 int stop = (repeated) ? 0 : 1;
bogdanm 0:9b334a45a8ff 58 int written = i2c_write(&_i2c, address, data, length, stop);
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 return length != written;
bogdanm 0:9b334a45a8ff 61 }
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 int I2C::write(int data) {
bogdanm 0:9b334a45a8ff 64 return i2c_byte_write(&_i2c, data);
bogdanm 0:9b334a45a8ff 65 }
bogdanm 0:9b334a45a8ff 66
bogdanm 0:9b334a45a8ff 67 // read - Master Reciever Mode
bogdanm 0:9b334a45a8ff 68 int I2C::read(int address, char* data, int length, bool repeated) {
bogdanm 0:9b334a45a8ff 69 aquire();
bogdanm 0:9b334a45a8ff 70
bogdanm 0:9b334a45a8ff 71 int stop = (repeated) ? 0 : 1;
bogdanm 0:9b334a45a8ff 72 int read = i2c_read(&_i2c, address, data, length, stop);
bogdanm 0:9b334a45a8ff 73
bogdanm 0:9b334a45a8ff 74 return length != read;
bogdanm 0:9b334a45a8ff 75 }
bogdanm 0:9b334a45a8ff 76
bogdanm 0:9b334a45a8ff 77 int I2C::read(int ack) {
bogdanm 0:9b334a45a8ff 78 if (ack) {
bogdanm 0:9b334a45a8ff 79 return i2c_byte_read(&_i2c, 0);
bogdanm 0:9b334a45a8ff 80 } else {
bogdanm 0:9b334a45a8ff 81 return i2c_byte_read(&_i2c, 1);
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83 }
bogdanm 0:9b334a45a8ff 84
bogdanm 0:9b334a45a8ff 85 void I2C::start(void) {
bogdanm 0:9b334a45a8ff 86 i2c_start(&_i2c);
bogdanm 0:9b334a45a8ff 87 }
bogdanm 0:9b334a45a8ff 88
bogdanm 0:9b334a45a8ff 89 void I2C::stop(void) {
bogdanm 0:9b334a45a8ff 90 i2c_stop(&_i2c);
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 #if DEVICE_I2C_ASYNCH
bogdanm 0:9b334a45a8ff 94
bogdanm 0:9b334a45a8ff 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)
bogdanm 0:9b334a45a8ff 96 {
bogdanm 0:9b334a45a8ff 97 if (i2c_active(&_i2c)) {
bogdanm 0:9b334a45a8ff 98 return -1; // transaction ongoing
bogdanm 0:9b334a45a8ff 99 }
bogdanm 0:9b334a45a8ff 100 aquire();
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 _callback = callback;
bogdanm 0:9b334a45a8ff 103 int stop = (repeated) ? 0 : 1;
bogdanm 0:9b334a45a8ff 104 _irq.callback(&I2C::irq_handler_asynch);
bogdanm 0:9b334a45a8ff 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
bogdanm 0:9b334a45a8ff 106 return 0;
bogdanm 0:9b334a45a8ff 107 }
bogdanm 0:9b334a45a8ff 108
bogdanm 0:9b334a45a8ff 109 void I2C::abort_transfer(void)
bogdanm 0:9b334a45a8ff 110 {
bogdanm 0:9b334a45a8ff 111 i2c_abort_asynch(&_i2c);
bogdanm 0:9b334a45a8ff 112 }
bogdanm 0:9b334a45a8ff 113
bogdanm 0:9b334a45a8ff 114 void I2C::irq_handler_asynch(void)
bogdanm 0:9b334a45a8ff 115 {
bogdanm 0:9b334a45a8ff 116 int event = i2c_irq_handler_asynch(&_i2c);
bogdanm 0:9b334a45a8ff 117 if (_callback && event) {
bogdanm 0:9b334a45a8ff 118 _callback.call(event);
bogdanm 0:9b334a45a8ff 119 }
bogdanm 0:9b334a45a8ff 120
bogdanm 0:9b334a45a8ff 121 }
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123
bogdanm 0:9b334a45a8ff 124 #endif
bogdanm 0:9b334a45a8ff 125
bogdanm 0:9b334a45a8ff 126 } // namespace mbed
bogdanm 0:9b334a45a8ff 127
bogdanm 0:9b334a45a8ff 128 #endif