Yihui Xiong / mbed-src-nrf51822

customized mbed library sources for nrf51822

Dependents:   Grove_Node Potentiometer BLE_Beacon I2C_Scanner

common/SPI.cpp@0:700cadd8b708, 2014-11-04 (annotated)

Committer:
yihui
Date:
Tue Nov 04 07:38:53 2014 +0000
Revision:
0:700cadd8b708
customized mbed-src library for nrf51822

Who changed what in which revision?

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yihui 0:700cadd8b708 1 /* mbed Microcontroller Library
yihui 0:700cadd8b708 2 * Copyright (c) 2006-2013 ARM Limited
yihui 0:700cadd8b708 3 *
yihui 0:700cadd8b708 4 * Licensed under the Apache License, Version 2.0 (the "License");
yihui 0:700cadd8b708 5 * you may not use this file except in compliance with the License.
yihui 0:700cadd8b708 6 * You may obtain a copy of the License at
yihui 0:700cadd8b708 7 *
yihui 0:700cadd8b708 8 * http://www.apache.org/licenses/LICENSE-2.0
yihui 0:700cadd8b708 9 *
yihui 0:700cadd8b708 10 * Unless required by applicable law or agreed to in writing, software
yihui 0:700cadd8b708 11 * distributed under the License is distributed on an "AS IS" BASIS,
yihui 0:700cadd8b708 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
yihui 0:700cadd8b708 13 * See the License for the specific language governing permissions and
yihui 0:700cadd8b708 14 * limitations under the License.
yihui 0:700cadd8b708 15 */
yihui 0:700cadd8b708 16 #include "SPI.h"
yihui 0:700cadd8b708 17
yihui 0:700cadd8b708 18 #if DEVICE_SPI
yihui 0:700cadd8b708 19
yihui 0:700cadd8b708 20 namespace mbed {
yihui 0:700cadd8b708 21
yihui 0:700cadd8b708 22 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) :
yihui 0:700cadd8b708 23 _spi(),
yihui 0:700cadd8b708 24 _bits(8),
yihui 0:700cadd8b708 25 _mode(0),
yihui 0:700cadd8b708 26 _hz(1000000) {
yihui 0:700cadd8b708 27 spi_init(&_spi, mosi, miso, sclk, NC);
yihui 0:700cadd8b708 28 spi_format(&_spi, _bits, _mode, 0);
yihui 0:700cadd8b708 29 spi_frequency(&_spi, _hz);
yihui 0:700cadd8b708 30 }
yihui 0:700cadd8b708 31
yihui 0:700cadd8b708 32 void SPI::format(int bits, int mode) {
yihui 0:700cadd8b708 33 _bits = bits;
yihui 0:700cadd8b708 34 _mode = mode;
yihui 0:700cadd8b708 35 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
yihui 0:700cadd8b708 36 aquire();
yihui 0:700cadd8b708 37 }
yihui 0:700cadd8b708 38
yihui 0:700cadd8b708 39 void SPI::frequency(int hz) {
yihui 0:700cadd8b708 40 _hz = hz;
yihui 0:700cadd8b708 41 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
yihui 0:700cadd8b708 42 aquire();
yihui 0:700cadd8b708 43 }
yihui 0:700cadd8b708 44
yihui 0:700cadd8b708 45 SPI* SPI::_owner = NULL;
yihui 0:700cadd8b708 46
yihui 0:700cadd8b708 47 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
yihui 0:700cadd8b708 48 void SPI::aquire() {
yihui 0:700cadd8b708 49 if (_owner != this) {
yihui 0:700cadd8b708 50 spi_format(&_spi, _bits, _mode, 0);
yihui 0:700cadd8b708 51 spi_frequency(&_spi, _hz);
yihui 0:700cadd8b708 52 _owner = this;
yihui 0:700cadd8b708 53 }
yihui 0:700cadd8b708 54 }
yihui 0:700cadd8b708 55
yihui 0:700cadd8b708 56 int SPI::write(int value) {
yihui 0:700cadd8b708 57 aquire();
yihui 0:700cadd8b708 58 return spi_master_write(&_spi, value);
yihui 0:700cadd8b708 59 }
yihui 0:700cadd8b708 60
yihui 0:700cadd8b708 61 } // namespace mbed
yihui 0:700cadd8b708 62
yihui 0:700cadd8b708 63 #endif