Lancaster University / mbed-src

Lancaster University's (short term!) clone of mbed-src for micro:bit. This is a copy of the github branch https://github.com/lancaster-university/mbed-classic

Fork of mbed-src by mbed official

common/SPI.cpp@13:0645d8841f51, 2013-08-05 (annotated)

Committer:
bogdanm
Date:
Mon Aug 05 14:12:34 2013 +0300
Revision:
13:0645d8841f51
Parent:
10:3bc89ef62ce7
Child:
50:b08ceb75017d
Update mbed sources to revision 64

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
bogdanm 13:0645d8841f51 22 SPI::SPI(PinName mosi, PinName miso, PinName sclk) {
bogdanm 13:0645d8841f51 23 spi_init(&_spi, mosi, miso, sclk, NC);
bogdanm 13:0645d8841f51 24 _bits = 8;
bogdanm 13:0645d8841f51 25 _mode = 0;
bogdanm 13:0645d8841f51 26 _hz = 1000000;
bogdanm 13:0645d8841f51 27 spi_format(&_spi, _bits, _mode, 0);
bogdanm 13:0645d8841f51 28 spi_frequency(&_spi, _hz);
bogdanm 13:0645d8841f51 29 }
bogdanm 13:0645d8841f51 30
bogdanm 13:0645d8841f51 31 void SPI::format(int bits, int mode) {
bogdanm 13:0645d8841f51 32 _bits = bits;
bogdanm 13:0645d8841f51 33 _mode = mode;
bogdanm 13:0645d8841f51 34 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
bogdanm 13:0645d8841f51 35 aquire();
bogdanm 13:0645d8841f51 36 }
bogdanm 13:0645d8841f51 37
bogdanm 13:0645d8841f51 38 void SPI::frequency(int hz) {
bogdanm 13:0645d8841f51 39 _hz = hz;
bogdanm 13:0645d8841f51 40 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
bogdanm 13:0645d8841f51 41 aquire();
bogdanm 13:0645d8841f51 42 }
bogdanm 13:0645d8841f51 43
bogdanm 13:0645d8841f51 44 SPI* SPI::_owner = NULL;
bogdanm 13:0645d8841f51 45
bogdanm 13:0645d8841f51 46 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
bogdanm 13:0645d8841f51 47 void SPI::aquire() {
bogdanm 13:0645d8841f51 48 if (_owner != this) {
bogdanm 13:0645d8841f51 49 spi_format(&_spi, _bits, _mode, 0);
bogdanm 13:0645d8841f51 50 spi_frequency(&_spi, _hz);
bogdanm 13:0645d8841f51 51 _owner = this;
bogdanm 13:0645d8841f51 52 }
bogdanm 13:0645d8841f51 53 }
bogdanm 13:0645d8841f51 54
bogdanm 13:0645d8841f51 55 int SPI::write(int value) {
bogdanm 13:0645d8841f51 56 aquire();
bogdanm 13:0645d8841f51 57 return spi_master_write(&_spi, value);
bogdanm 13:0645d8841f51 58 }
bogdanm 13:0645d8841f51 59
bogdanm 13:0645d8841f51 60 } // namespace mbed
bogdanm 13:0645d8841f51 61
bogdanm 13:0645d8841f51 62 #endif