Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

features/unsupported/tests/libs/SPIHalfDuplex/SPIHalfDuplex.cpp@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library - SPIHalfDuplex
elessair 0:f269e3021894 2 * Copyright (c) 2010-2011 ARM Limited. All rights reserved.
elessair 0:f269e3021894 3 */
elessair 0:f269e3021894 4 #include "SPIHalfDuplex.h"
elessair 0:f269e3021894 5
elessair 0:f269e3021894 6 #if DEVICE_SPI
elessair 0:f269e3021894 7
elessair 0:f269e3021894 8 #include "spi_api.h"
elessair 0:f269e3021894 9 #include "pinmap.h"
elessair 0:f269e3021894 10
elessair 0:f269e3021894 11 #define GPIO_MODE 0
elessair 0:f269e3021894 12 #define SPI_MODE 2
elessair 0:f269e3021894 13
elessair 0:f269e3021894 14 namespace mbed {
elessair 0:f269e3021894 15
elessair 0:f269e3021894 16 SPIHalfDuplex::SPIHalfDuplex(PinName mosi, PinName miso, PinName sclk) : SPI(mosi, miso, sclk) {
elessair 0:f269e3021894 17 _mosi = mosi;
elessair 0:f269e3021894 18 _miso = miso;
elessair 0:f269e3021894 19 _sbits = _bits;
elessair 0:f269e3021894 20 }
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 void SPIHalfDuplex::slave_format(int sbits) {
elessair 0:f269e3021894 23 _sbits = sbits;
elessair 0:f269e3021894 24 }
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 int SPIHalfDuplex::write(int value) {
elessair 0:f269e3021894 27 int t_bits = _bits;
elessair 0:f269e3021894 28 pin_function(_mosi, SPI_MODE);
elessair 0:f269e3021894 29 int ret_val = SPI::write(value);
elessair 0:f269e3021894 30 if (ret_val != value) {
elessair 0:f269e3021894 31 return -1;
elessair 0:f269e3021894 32 }
elessair 0:f269e3021894 33 format(_sbits, _mode);
elessair 0:f269e3021894 34 pin_function(_mosi, GPIO_MODE);
elessair 0:f269e3021894 35 ret_val = SPI::write(0x55);
elessair 0:f269e3021894 36 format(t_bits, _mode);
elessair 0:f269e3021894 37 pin_function(_mosi, SPI_MODE);
elessair 0:f269e3021894 38 return ret_val;
elessair 0:f269e3021894 39 }
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 } // end namespace mbed
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 #endif