mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
Diff: cpp/SPI.cpp
- Revision:
- 0:fd0d7bdfcdc2
- Child:
- 2:143cac498751
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/cpp/SPI.cpp Tue Nov 20 17:24:08 2012 +0000 @@ -0,0 +1,68 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2012 ARM Limited + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#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