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common/SPI.cpp
- Committer:
- mbed_official
- Date:
- 2013-11-21
- Revision:
- 47:02833c62d054
- Parent:
- 13:0645d8841f51
- Child:
- 50:b08ceb75017d
File content as of revision 47:02833c62d054:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "SPI.h" #if DEVICE_SPI namespace mbed { SPI::SPI(PinName mosi, PinName miso, PinName sclk) { spi_init(&_spi, mosi, miso, sclk, NC); _bits = 8; _mode = 0; _hz = 1000000; spi_format(&_spi, _bits, _mode, 0); spi_frequency(&_spi, _hz); } void SPI::format(int bits, int mode) { _bits = bits; _mode = mode; SPI::_owner = NULL; // Not that elegant, but works. rmeyer aquire(); } void SPI::frequency(int hz) { _hz = hz; SPI::_owner = NULL; // Not that elegant, but works. rmeyer aquire(); } SPI* SPI::_owner = NULL; // ignore the fact there are multiple physical spis, and always update if it wasnt us last void SPI::aquire() { if (_owner != this) { spi_format(&_spi, _bits, _mode, 0); spi_frequency(&_spi, _hz); _owner = this; } } int SPI::write(int value) { aquire(); return spi_master_write(&_spi, value); } } // namespace mbed #endif