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SPI.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #include "SPI.h" 00017 00018 #if DEVICE_SPI 00019 00020 namespace mbed { 00021 00022 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) { 00023 spi_init(&_spi, mosi, miso, sclk, NC); 00024 _bits = 8; 00025 _mode = 0; 00026 _hz = 1000000; 00027 spi_format(&_spi, _bits, _mode, 0); 00028 spi_frequency(&_spi, _hz); 00029 } 00030 00031 void SPI::format(int bits, int mode) { 00032 _bits = bits; 00033 _mode = mode; 00034 SPI::_owner = NULL; // Not that elegant, but works. rmeyer 00035 aquire(); 00036 } 00037 00038 void SPI::frequency(int hz) { 00039 _hz = hz; 00040 SPI::_owner = NULL; // Not that elegant, but works. rmeyer 00041 aquire(); 00042 } 00043 00044 SPI* SPI::_owner = NULL; 00045 00046 // ignore the fact there are multiple physical spis, and always update if it wasnt us last 00047 void SPI::aquire() { 00048 if (_owner != this) { 00049 spi_format(&_spi, _bits, _mode, 0); 00050 spi_frequency(&_spi, _hz); 00051 _owner = this; 00052 } 00053 } 00054 00055 int SPI::write(int value) { 00056 aquire(); 00057 return spi_master_write(&_spi, value); 00058 } 00059 00060 } // namespace mbed 00061 00062 #endif
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