mirror of https://github.com/ARMmbed/mbed-os.git
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "SPI.h"
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#if DEVICE_SPI
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namespace mbed {
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SPI::SPI(PinName mosi, PinName miso, PinName sclk) {
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spi_init(&_spi, mosi, miso, sclk, NC);
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_bits = 8;
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_mode = 0;
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_hz = 1000000;
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spi_format(&_spi, _bits, _mode, 0);
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spi_frequency(&_spi, _hz);
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}
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void SPI::format(int bits, int mode) {
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_bits = bits;
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_mode = mode;
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SPI::_owner = NULL; // Not that elegant, but works. rmeyer
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aquire();
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}
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void SPI::frequency(int hz) {
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_hz = hz;
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SPI::_owner = NULL; // Not that elegant, but works. rmeyer
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aquire();
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}
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SPI* SPI::_owner = NULL;
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// ignore the fact there are multiple physical spis, and always update if it wasnt us last
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void SPI::aquire() {
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if (_owner != this) {
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spi_format(&_spi, _bits, _mode, 0);
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spi_frequency(&_spi, _hz);
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_owner = this;
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}
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}
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int SPI::write(int value) {
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aquire();
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return spi_master_write(&_spi, value);
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}
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} // namespace mbed
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#endif
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