Ermanno Brusadin / mbed

mbed library sources

Dependents:   FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more

common/SPI.cpp@0:6bc4ac881c8e, 2016-07-28 (annotated)

Committer:
ebrus
Date:
Thu Jul 28 15:56:34 2016 +0000
Revision:
0:6bc4ac881c8e
1;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ebrus 0:6bc4ac881c8e 1 /* mbed Microcontroller Library
ebrus 0:6bc4ac881c8e 2 * Copyright (c) 2006-2013 ARM Limited
ebrus 0:6bc4ac881c8e 3 *
ebrus 0:6bc4ac881c8e 4 * Licensed under the Apache License, Version 2.0 (the "License");
ebrus 0:6bc4ac881c8e 5 * you may not use this file except in compliance with the License.
ebrus 0:6bc4ac881c8e 6 * You may obtain a copy of the License at
ebrus 0:6bc4ac881c8e 7 *
ebrus 0:6bc4ac881c8e 8 * http://www.apache.org/licenses/LICENSE-2.0
ebrus 0:6bc4ac881c8e 9 *
ebrus 0:6bc4ac881c8e 10 * Unless required by applicable law or agreed to in writing, software
ebrus 0:6bc4ac881c8e 11 * distributed under the License is distributed on an "AS IS" BASIS,
ebrus 0:6bc4ac881c8e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ebrus 0:6bc4ac881c8e 13 * See the License for the specific language governing permissions and
ebrus 0:6bc4ac881c8e 14 * limitations under the License.
ebrus 0:6bc4ac881c8e 15 */
ebrus 0:6bc4ac881c8e 16 #include "SPI.h"
ebrus 0:6bc4ac881c8e 17
ebrus 0:6bc4ac881c8e 18 #if DEVICE_SPI
ebrus 0:6bc4ac881c8e 19
ebrus 0:6bc4ac881c8e 20 namespace mbed {
ebrus 0:6bc4ac881c8e 21
ebrus 0:6bc4ac881c8e 22 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) :
ebrus 0:6bc4ac881c8e 23 _spi(),
ebrus 0:6bc4ac881c8e 24 _bits(8),
ebrus 0:6bc4ac881c8e 25 _mode(0),
ebrus 0:6bc4ac881c8e 26 _hz(1000000) {
ebrus 0:6bc4ac881c8e 27 spi_init(&_spi, mosi, miso, sclk, NC);
ebrus 0:6bc4ac881c8e 28 spi_format(&_spi, _bits, _mode, 0);
ebrus 0:6bc4ac881c8e 29 spi_frequency(&_spi, _hz);
ebrus 0:6bc4ac881c8e 30 }
ebrus 0:6bc4ac881c8e 31
ebrus 0:6bc4ac881c8e 32 void SPI::format(int bits, int mode) {
ebrus 0:6bc4ac881c8e 33 _bits = bits;
ebrus 0:6bc4ac881c8e 34 _mode = mode;
ebrus 0:6bc4ac881c8e 35 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
ebrus 0:6bc4ac881c8e 36 aquire();
ebrus 0:6bc4ac881c8e 37 }
ebrus 0:6bc4ac881c8e 38
ebrus 0:6bc4ac881c8e 39 void SPI::frequency(int hz) {
ebrus 0:6bc4ac881c8e 40 _hz = hz;
ebrus 0:6bc4ac881c8e 41 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
ebrus 0:6bc4ac881c8e 42 aquire();
ebrus 0:6bc4ac881c8e 43 }
ebrus 0:6bc4ac881c8e 44
ebrus 0:6bc4ac881c8e 45 SPI* SPI::_owner = NULL;
ebrus 0:6bc4ac881c8e 46
ebrus 0:6bc4ac881c8e 47 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
ebrus 0:6bc4ac881c8e 48 void SPI::aquire() {
ebrus 0:6bc4ac881c8e 49 if (_owner != this) {
ebrus 0:6bc4ac881c8e 50 spi_format(&_spi, _bits, _mode, 0);
ebrus 0:6bc4ac881c8e 51 spi_frequency(&_spi, _hz);
ebrus 0:6bc4ac881c8e 52 _owner = this;
ebrus 0:6bc4ac881c8e 53 }
ebrus 0:6bc4ac881c8e 54 }
ebrus 0:6bc4ac881c8e 55
ebrus 0:6bc4ac881c8e 56 int SPI::write(int value) {
ebrus 0:6bc4ac881c8e 57 aquire();
ebrus 0:6bc4ac881c8e 58 return spi_master_write(&_spi, value);
ebrus 0:6bc4ac881c8e 59 }
ebrus 0:6bc4ac881c8e 60
ebrus 0:6bc4ac881c8e 61 } // namespace mbed
ebrus 0:6bc4ac881c8e 62
ebrus 0:6bc4ac881c8e 63 #endif