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