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