marcus chiou / mbed-src

mbed library sources

Fork of mbed-src 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