44 lines
882 B
C++
44 lines
882 B
C++
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/* mbed Microcontroller Library - SPIHalfDuplex
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* Copyright (c) 2010-2011 ARM Limited. All rights reserved.
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*/
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#include "SPIHalfDuplex.h"
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#if DEVICE_SPI
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#include "spi_api.h"
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#include "pinmap.h"
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#define GPIO_MODE 0
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#define SPI_MODE 2
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namespace mbed {
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SPIHalfDuplex::SPIHalfDuplex(PinName mosi, PinName miso, PinName sclk) : SPI(mosi, miso, sclk) {
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_mosi = mosi;
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_miso = miso;
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_sbits = _bits;
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}
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void SPIHalfDuplex::slave_format(int sbits) {
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_sbits = sbits;
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}
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int SPIHalfDuplex::write(int value) {
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int t_bits = _bits;
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pin_function(_mosi, SPI_MODE);
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int ret_val = SPI::write(value);
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if (ret_val != value) {
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return -1;
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}
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format(_sbits, _mode);
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pin_function(_mosi, GPIO_MODE);
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ret_val = SPI::write(0x55);
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format(t_bits, _mode);
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pin_function(_mosi, SPI_MODE);
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return ret_val;
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}
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} // end namespace mbed
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#endif
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