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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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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

common/SPI.cpp@212:34d62c0b2af6, 2014-05-26 (annotated)

Committer:
mbed_official
Date:
Mon May 26 18:15:07 2014 +0100
Revision:
212:34d62c0b2af6
Parent:
50:b08ceb75017d
Child:
525:c320967f86b9
Synchronized with git revision f65b7d907785089e8dd942446f1c974b3a213a39



Full URL: https://github.com/mbedmicro/mbed/commit/f65b7d907785089e8dd942446f1c974b3a213a39/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
bogdanm 13:0645d8841f51 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #include "SPI.h"
bogdanm 13:0645d8841f51 17
bogdanm 13:0645d8841f51 18 #if DEVICE_SPI
bogdanm 13:0645d8841f51 19
bogdanm 13:0645d8841f51 20 namespace mbed {
bogdanm 13:0645d8841f51 21
mbed_official 212:34d62c0b2af6 22 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) :
mbed_official 212:34d62c0b2af6 23 _spi(),
mbed_official 212:34d62c0b2af6 24 _bits(8),
mbed_official 212:34d62c0b2af6 25 _mode(0),
mbed_official 212:34d62c0b2af6 26 _hz(1000000) {
bogdanm 13:0645d8841f51 27 spi_init(&_spi, mosi, miso, sclk, NC);
bogdanm 13:0645d8841f51 28 spi_format(&_spi, _bits, _mode, 0);
bogdanm 13:0645d8841f51 29 spi_frequency(&_spi, _hz);
bogdanm 13:0645d8841f51 30 }
bogdanm 13:0645d8841f51 31
bogdanm 13:0645d8841f51 32 void SPI::format(int bits, int mode) {
bogdanm 13:0645d8841f51 33 _bits = bits;
bogdanm 13:0645d8841f51 34 _mode = mode;
bogdanm 13:0645d8841f51 35 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
bogdanm 13:0645d8841f51 36 aquire();
bogdanm 13:0645d8841f51 37 }
bogdanm 13:0645d8841f51 38
bogdanm 13:0645d8841f51 39 void SPI::frequency(int hz) {
bogdanm 13:0645d8841f51 40 _hz = hz;
bogdanm 13:0645d8841f51 41 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
bogdanm 13:0645d8841f51 42 aquire();
bogdanm 13:0645d8841f51 43 }
bogdanm 13:0645d8841f51 44
bogdanm 13:0645d8841f51 45 SPI* SPI::_owner = NULL;
bogdanm 13:0645d8841f51 46
bogdanm 13:0645d8841f51 47 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
bogdanm 13:0645d8841f51 48 void SPI::aquire() {
bogdanm 13:0645d8841f51 49 if (_owner != this) {
bogdanm 13:0645d8841f51 50 spi_format(&_spi, _bits, _mode, 0);
bogdanm 13:0645d8841f51 51 spi_frequency(&_spi, _hz);
bogdanm 13:0645d8841f51 52 _owner = this;
bogdanm 13:0645d8841f51 53 }
bogdanm 13:0645d8841f51 54 }
bogdanm 13:0645d8841f51 55
bogdanm 13:0645d8841f51 56 int SPI::write(int value) {
bogdanm 13:0645d8841f51 57 aquire();
bogdanm 13:0645d8841f51 58 return spi_master_write(&_spi, value);
bogdanm 13:0645d8841f51 59 }
bogdanm 13:0645d8841f51 60
bogdanm 13:0645d8841f51 61 } // namespace mbed
bogdanm 13:0645d8841f51 62
bogdanm 13:0645d8841f51 63 #endif