mbed unsupported / SPIHalfDuplex

SPI Half-Duplex

SPIHalfDuplex.cpp@0:e9b41fc7d351, 2012-12-06 (annotated)

Committer:
mbed_unsupported
Date:
Thu Dec 06 12:47:45 2012 +0000
Revision:
0:e9b41fc7d351
SPI Half-Duplex

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_unsupported 0:e9b41fc7d351 1 /* mbed Microcontroller Library
mbed_unsupported 0:e9b41fc7d351 2 * Copyright (c) 2006-2012 ARM Limited
mbed_unsupported 0:e9b41fc7d351 3 *
mbed_unsupported 0:e9b41fc7d351 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mbed_unsupported 0:e9b41fc7d351 5 * of this software and associated documentation files (the "Software"), to deal
mbed_unsupported 0:e9b41fc7d351 6 * in the Software without restriction, including without limitation the rights
mbed_unsupported 0:e9b41fc7d351 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mbed_unsupported 0:e9b41fc7d351 8 * copies of the Software, and to permit persons to whom the Software is
mbed_unsupported 0:e9b41fc7d351 9 * furnished to do so, subject to the following conditions:
mbed_unsupported 0:e9b41fc7d351 10 *
mbed_unsupported 0:e9b41fc7d351 11 * The above copyright notice and this permission notice shall be included in
mbed_unsupported 0:e9b41fc7d351 12 * all copies or substantial portions of the Software.
mbed_unsupported 0:e9b41fc7d351 13 *
mbed_unsupported 0:e9b41fc7d351 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mbed_unsupported 0:e9b41fc7d351 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mbed_unsupported 0:e9b41fc7d351 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mbed_unsupported 0:e9b41fc7d351 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mbed_unsupported 0:e9b41fc7d351 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mbed_unsupported 0:e9b41fc7d351 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mbed_unsupported 0:e9b41fc7d351 20 * SOFTWARE.
mbed_unsupported 0:e9b41fc7d351 21 *
mbed_unsupported 0:e9b41fc7d351 22 * NOTE: This is an unsupported legacy untested library.
mbed_unsupported 0:e9b41fc7d351 23 */
mbed_unsupported 0:e9b41fc7d351 24 #include "SPIHalfDuplex.h"
mbed_unsupported 0:e9b41fc7d351 25
mbed_unsupported 0:e9b41fc7d351 26 #if DEVICE_SPI
mbed_unsupported 0:e9b41fc7d351 27
mbed_unsupported 0:e9b41fc7d351 28 #include "spi_api.h"
mbed_unsupported 0:e9b41fc7d351 29 #include "PinNames.h"
mbed_unsupported 0:e9b41fc7d351 30 #include "pinmap.h"
mbed_unsupported 0:e9b41fc7d351 31
mbed_unsupported 0:e9b41fc7d351 32 #define GPIO_MODE 0
mbed_unsupported 0:e9b41fc7d351 33 #define SPI_MODE 2
mbed_unsupported 0:e9b41fc7d351 34
mbed_unsupported 0:e9b41fc7d351 35 namespace mbed {
mbed_unsupported 0:e9b41fc7d351 36
mbed_unsupported 0:e9b41fc7d351 37 SPIHalfDuplex::SPIHalfDuplex(PinName mosi, PinName miso, PinName sclk,
mbed_unsupported 0:e9b41fc7d351 38 const char *name) : SPI(mosi, miso, sclk, name) {
mbed_unsupported 0:e9b41fc7d351 39 _mosi = mosi;
mbed_unsupported 0:e9b41fc7d351 40 _miso = miso;
mbed_unsupported 0:e9b41fc7d351 41 _sbits = _bits;
mbed_unsupported 0:e9b41fc7d351 42 }
mbed_unsupported 0:e9b41fc7d351 43
mbed_unsupported 0:e9b41fc7d351 44 void SPIHalfDuplex::slave_format(int sbits) {
mbed_unsupported 0:e9b41fc7d351 45 _sbits = sbits;
mbed_unsupported 0:e9b41fc7d351 46 }
mbed_unsupported 0:e9b41fc7d351 47
mbed_unsupported 0:e9b41fc7d351 48 int SPIHalfDuplex::write(int value) {
mbed_unsupported 0:e9b41fc7d351 49 int t_bits = _bits;
mbed_unsupported 0:e9b41fc7d351 50 pin_function(_mosi, SPI_MODE);
mbed_unsupported 0:e9b41fc7d351 51 int ret_val = SPI::write(value);
mbed_unsupported 0:e9b41fc7d351 52 if(ret_val != value) {
mbed_unsupported 0:e9b41fc7d351 53 return -1;
mbed_unsupported 0:e9b41fc7d351 54 }
mbed_unsupported 0:e9b41fc7d351 55 format(_sbits, _mode);
mbed_unsupported 0:e9b41fc7d351 56 pin_function(_mosi, GPIO_MODE);
mbed_unsupported 0:e9b41fc7d351 57 ret_val = SPI::write(0x55);
mbed_unsupported 0:e9b41fc7d351 58 format(t_bits, _mode);
mbed_unsupported 0:e9b41fc7d351 59 pin_function(_mosi, SPI_MODE);
mbed_unsupported 0:e9b41fc7d351 60 return ret_val;
mbed_unsupported 0:e9b41fc7d351 61 }
mbed_unsupported 0:e9b41fc7d351 62
mbed_unsupported 0:e9b41fc7d351 63 } // end namespace mbed
mbed_unsupported 0:e9b41fc7d351 64
mbed_unsupported 0:e9b41fc7d351 65 #endif