Wei Chang Shen / mbed-src

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common/SPI.cpp@9:0ce32e54c9a7, 2013-06-10 (annotated)

Committer:
emilmont
Date:
Mon Jun 10 16:03:00 2013 +0100
Revision:
9:0ce32e54c9a7
Parent:
cpp/SPI.cpp@2:143cac498751
Child:
10:3bc89ef62ce7
Refactoring of the mbed SDK:

- Provide a well defined HAL and API

- Keep separated the HAL implementations for the different targets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
emilmont 2:143cac498751 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
emilmont 2:143cac498751 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 2:143cac498751 5 * you may not use this file except in compliance with the License.
emilmont 2:143cac498751 6 * You may obtain a copy of the License at
mbed_official 0:fd0d7bdfcdc2 7 *
emilmont 2:143cac498751 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:fd0d7bdfcdc2 9 *
emilmont 2:143cac498751 10 * Unless required by applicable law or agreed to in writing, software
emilmont 2:143cac498751 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 2:143cac498751 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 2:143cac498751 13 * See the License for the specific language governing permissions and
emilmont 2:143cac498751 14 * limitations under the License.
mbed_official 0:fd0d7bdfcdc2 15 */
mbed_official 0:fd0d7bdfcdc2 16 #include "SPI.h"
mbed_official 0:fd0d7bdfcdc2 17
mbed_official 0:fd0d7bdfcdc2 18 #if DEVICE_SPI
mbed_official 0:fd0d7bdfcdc2 19
mbed_official 0:fd0d7bdfcdc2 20 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 21
mbed_official 0:fd0d7bdfcdc2 22 SPI::SPI(PinName mosi, PinName miso, PinName sclk) {
mbed_official 0:fd0d7bdfcdc2 23 spi_init(&_spi, mosi, miso, sclk, NC);
mbed_official 0:fd0d7bdfcdc2 24 _bits = 8;
mbed_official 0:fd0d7bdfcdc2 25 _mode = 0;
mbed_official 0:fd0d7bdfcdc2 26 _hz = 1000000;
mbed_official 0:fd0d7bdfcdc2 27 spi_format(&_spi, _bits, _mode, 0);
mbed_official 0:fd0d7bdfcdc2 28 spi_frequency(&_spi, _hz);
mbed_official 0:fd0d7bdfcdc2 29 }
mbed_official 0:fd0d7bdfcdc2 30
mbed_official 0:fd0d7bdfcdc2 31 void SPI::format(int bits, int mode) {
mbed_official 0:fd0d7bdfcdc2 32 _bits = bits;
mbed_official 0:fd0d7bdfcdc2 33 _mode = mode;
mbed_official 0:fd0d7bdfcdc2 34 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
mbed_official 0:fd0d7bdfcdc2 35 aquire();
mbed_official 0:fd0d7bdfcdc2 36 }
mbed_official 0:fd0d7bdfcdc2 37
emilmont 2:143cac498751 38 void SPI::frequency(int hz) {
mbed_official 0:fd0d7bdfcdc2 39 _hz = hz;
mbed_official 0:fd0d7bdfcdc2 40 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
mbed_official 0:fd0d7bdfcdc2 41 aquire();
mbed_official 0:fd0d7bdfcdc2 42 }
mbed_official 0:fd0d7bdfcdc2 43
mbed_official 0:fd0d7bdfcdc2 44 SPI* SPI::_owner = NULL;
mbed_official 0:fd0d7bdfcdc2 45
mbed_official 0:fd0d7bdfcdc2 46 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
mbed_official 0:fd0d7bdfcdc2 47 void SPI::aquire() {
mbed_official 0:fd0d7bdfcdc2 48 if (_owner != this) {
mbed_official 0:fd0d7bdfcdc2 49 spi_format(&_spi, _bits, _mode, 0);
mbed_official 0:fd0d7bdfcdc2 50 spi_frequency(&_spi, _hz);
mbed_official 0:fd0d7bdfcdc2 51 _owner = this;
mbed_official 0:fd0d7bdfcdc2 52 }
mbed_official 0:fd0d7bdfcdc2 53 }
mbed_official 0:fd0d7bdfcdc2 54
mbed_official 0:fd0d7bdfcdc2 55 int SPI::write(int value) {
mbed_official 0:fd0d7bdfcdc2 56 aquire();
mbed_official 0:fd0d7bdfcdc2 57 return spi_master_write(&_spi, value);
mbed_official 0:fd0d7bdfcdc2 58 }
mbed_official 0:fd0d7bdfcdc2 59
mbed_official 0:fd0d7bdfcdc2 60 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 61
mbed_official 0:fd0d7bdfcdc2 62 #endif