test / mbed-src

mbed library sources

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cpp/SPI.cpp@0:fd0d7bdfcdc2, 2012-11-20 (annotated)

Committer:
mbed_official
Date:
Tue Nov 20 17:24:08 2012 +0000
Revision:
0:fd0d7bdfcdc2
Child:
2:143cac498751
mbed sources

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mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
mbed_official 0:fd0d7bdfcdc2 2 * Copyright (c) 2006-2012 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
mbed_official 0:fd0d7bdfcdc2 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mbed_official 0:fd0d7bdfcdc2 5 * of this software and associated documentation files (the "Software"), to deal
mbed_official 0:fd0d7bdfcdc2 6 * in the Software without restriction, including without limitation the rights
mbed_official 0:fd0d7bdfcdc2 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mbed_official 0:fd0d7bdfcdc2 8 * copies of the Software, and to permit persons to whom the Software is
mbed_official 0:fd0d7bdfcdc2 9 * furnished to do so, subject to the following conditions:
mbed_official 0:fd0d7bdfcdc2 10 *
mbed_official 0:fd0d7bdfcdc2 11 * The above copyright notice and this permission notice shall be included in
mbed_official 0:fd0d7bdfcdc2 12 * all copies or substantial portions of the Software.
mbed_official 0:fd0d7bdfcdc2 13 *
mbed_official 0:fd0d7bdfcdc2 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mbed_official 0:fd0d7bdfcdc2 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mbed_official 0:fd0d7bdfcdc2 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mbed_official 0:fd0d7bdfcdc2 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mbed_official 0:fd0d7bdfcdc2 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mbed_official 0:fd0d7bdfcdc2 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mbed_official 0:fd0d7bdfcdc2 20 * SOFTWARE.
mbed_official 0:fd0d7bdfcdc2 21 */
mbed_official 0:fd0d7bdfcdc2 22 #include "SPI.h"
mbed_official 0:fd0d7bdfcdc2 23
mbed_official 0:fd0d7bdfcdc2 24 #if DEVICE_SPI
mbed_official 0:fd0d7bdfcdc2 25
mbed_official 0:fd0d7bdfcdc2 26 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 27
mbed_official 0:fd0d7bdfcdc2 28 SPI::SPI(PinName mosi, PinName miso, PinName sclk) {
mbed_official 0:fd0d7bdfcdc2 29 spi_init(&_spi, mosi, miso, sclk, NC);
mbed_official 0:fd0d7bdfcdc2 30 _bits = 8;
mbed_official 0:fd0d7bdfcdc2 31 _mode = 0;
mbed_official 0:fd0d7bdfcdc2 32 _hz = 1000000;
mbed_official 0:fd0d7bdfcdc2 33 spi_format(&_spi, _bits, _mode, 0);
mbed_official 0:fd0d7bdfcdc2 34 spi_frequency(&_spi, _hz);
mbed_official 0:fd0d7bdfcdc2 35 }
mbed_official 0:fd0d7bdfcdc2 36
mbed_official 0:fd0d7bdfcdc2 37 void SPI::format(int bits, int mode) {
mbed_official 0:fd0d7bdfcdc2 38 _bits = bits;
mbed_official 0:fd0d7bdfcdc2 39 _mode = mode;
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 void SPI::frequency(int hz) {
mbed_official 0:fd0d7bdfcdc2 45 _hz = hz;
mbed_official 0:fd0d7bdfcdc2 46 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
mbed_official 0:fd0d7bdfcdc2 47 aquire();
mbed_official 0:fd0d7bdfcdc2 48 }
mbed_official 0:fd0d7bdfcdc2 49
mbed_official 0:fd0d7bdfcdc2 50 SPI* SPI::_owner = NULL;
mbed_official 0:fd0d7bdfcdc2 51
mbed_official 0:fd0d7bdfcdc2 52 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
mbed_official 0:fd0d7bdfcdc2 53 void SPI::aquire() {
mbed_official 0:fd0d7bdfcdc2 54 if (_owner != this) {
mbed_official 0:fd0d7bdfcdc2 55 spi_format(&_spi, _bits, _mode, 0);
mbed_official 0:fd0d7bdfcdc2 56 spi_frequency(&_spi, _hz);
mbed_official 0:fd0d7bdfcdc2 57 _owner = this;
mbed_official 0:fd0d7bdfcdc2 58 }
mbed_official 0:fd0d7bdfcdc2 59 }
mbed_official 0:fd0d7bdfcdc2 60
mbed_official 0:fd0d7bdfcdc2 61 int SPI::write(int value) {
mbed_official 0:fd0d7bdfcdc2 62 aquire();
mbed_official 0:fd0d7bdfcdc2 63 return spi_master_write(&_spi, value);
mbed_official 0:fd0d7bdfcdc2 64 }
mbed_official 0:fd0d7bdfcdc2 65
mbed_official 0:fd0d7bdfcdc2 66 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 67
mbed_official 0:fd0d7bdfcdc2 68 #endif