Ermanno Brusadin / mbed-src

mbed library sources

common/SPI.cpp@0:0a673c671a56, 2016-07-27 (annotated)

Committer:
ebrus
Date:
Wed Jul 27 18:35:32 2016 +0000
Revision:
0:0a673c671a56
4

Who changed what in which revision?

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ebrus 0:0a673c671a56 1 /* mbed Microcontroller Library
ebrus 0:0a673c671a56 2 * Copyright (c) 2006-2013 ARM Limited
ebrus 0:0a673c671a56 3 *
ebrus 0:0a673c671a56 4 * Licensed under the Apache License, Version 2.0 (the "License");
ebrus 0:0a673c671a56 5 * you may not use this file except in compliance with the License.
ebrus 0:0a673c671a56 6 * You may obtain a copy of the License at
ebrus 0:0a673c671a56 7 *
ebrus 0:0a673c671a56 8 * http://www.apache.org/licenses/LICENSE-2.0
ebrus 0:0a673c671a56 9 *
ebrus 0:0a673c671a56 10 * Unless required by applicable law or agreed to in writing, software
ebrus 0:0a673c671a56 11 * distributed under the License is distributed on an "AS IS" BASIS,
ebrus 0:0a673c671a56 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ebrus 0:0a673c671a56 13 * See the License for the specific language governing permissions and
ebrus 0:0a673c671a56 14 * limitations under the License.
ebrus 0:0a673c671a56 15 */
ebrus 0:0a673c671a56 16 #include "SPI.h"
ebrus 0:0a673c671a56 17
ebrus 0:0a673c671a56 18 #if DEVICE_SPI
ebrus 0:0a673c671a56 19
ebrus 0:0a673c671a56 20 namespace mbed {
ebrus 0:0a673c671a56 21
ebrus 0:0a673c671a56 22 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) :
ebrus 0:0a673c671a56 23 _spi(),
ebrus 0:0a673c671a56 24 _bits(8),
ebrus 0:0a673c671a56 25 _mode(0),
ebrus 0:0a673c671a56 26 _hz(1000000) {
ebrus 0:0a673c671a56 27 spi_init(&_spi, mosi, miso, sclk, NC);
ebrus 0:0a673c671a56 28 spi_format(&_spi, _bits, _mode, 0);
ebrus 0:0a673c671a56 29 spi_frequency(&_spi, _hz);
ebrus 0:0a673c671a56 30 }
ebrus 0:0a673c671a56 31
ebrus 0:0a673c671a56 32 void SPI::format(int bits, int mode) {
ebrus 0:0a673c671a56 33 _bits = bits;
ebrus 0:0a673c671a56 34 _mode = mode;
ebrus 0:0a673c671a56 35 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
ebrus 0:0a673c671a56 36 aquire();
ebrus 0:0a673c671a56 37 }
ebrus 0:0a673c671a56 38
ebrus 0:0a673c671a56 39 void SPI::frequency(int hz) {
ebrus 0:0a673c671a56 40 _hz = hz;
ebrus 0:0a673c671a56 41 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
ebrus 0:0a673c671a56 42 aquire();
ebrus 0:0a673c671a56 43 }
ebrus 0:0a673c671a56 44
ebrus 0:0a673c671a56 45 SPI* SPI::_owner = NULL;
ebrus 0:0a673c671a56 46
ebrus 0:0a673c671a56 47 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
ebrus 0:0a673c671a56 48 void SPI::aquire() {
ebrus 0:0a673c671a56 49 if (_owner != this) {
ebrus 0:0a673c671a56 50 spi_format(&_spi, _bits, _mode, 0);
ebrus 0:0a673c671a56 51 spi_frequency(&_spi, _hz);
ebrus 0:0a673c671a56 52 _owner = this;
ebrus 0:0a673c671a56 53 }
ebrus 0:0a673c671a56 54 }
ebrus 0:0a673c671a56 55
ebrus 0:0a673c671a56 56 int SPI::write(int value) {
ebrus 0:0a673c671a56 57 aquire();
ebrus 0:0a673c671a56 58 return spi_master_write(&_spi, value);
ebrus 0:0a673c671a56 59 }
ebrus 0:0a673c671a56 60
ebrus 0:0a673c671a56 61 } // namespace mbed
ebrus 0:0a673c671a56 62
ebrus 0:0a673c671a56 63 #endif