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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

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

Who changed what in which revision?

UserRevisionLine numberNew contents of line
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