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cpp/SPISlave.h@0:fd0d7bdfcdc2, 2012-11-20 (annotated)

Committer:
mbed_official
Date:
Tue Nov 20 17:24:08 2012 +0000
Revision:
0:fd0d7bdfcdc2
Child:
2:143cac498751
mbed sources

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UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
mbed_official 0:fd0d7bdfcdc2 2 * Copyright (c) 2006-2012 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
mbed_official 0:fd0d7bdfcdc2 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mbed_official 0:fd0d7bdfcdc2 5 * of this software and associated documentation files (the "Software"), to deal
mbed_official 0:fd0d7bdfcdc2 6 * in the Software without restriction, including without limitation the rights
mbed_official 0:fd0d7bdfcdc2 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mbed_official 0:fd0d7bdfcdc2 8 * copies of the Software, and to permit persons to whom the Software is
mbed_official 0:fd0d7bdfcdc2 9 * furnished to do so, subject to the following conditions:
mbed_official 0:fd0d7bdfcdc2 10 *
mbed_official 0:fd0d7bdfcdc2 11 * The above copyright notice and this permission notice shall be included in
mbed_official 0:fd0d7bdfcdc2 12 * all copies or substantial portions of the Software.
mbed_official 0:fd0d7bdfcdc2 13 *
mbed_official 0:fd0d7bdfcdc2 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mbed_official 0:fd0d7bdfcdc2 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mbed_official 0:fd0d7bdfcdc2 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mbed_official 0:fd0d7bdfcdc2 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mbed_official 0:fd0d7bdfcdc2 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mbed_official 0:fd0d7bdfcdc2 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mbed_official 0:fd0d7bdfcdc2 20 * SOFTWARE.
mbed_official 0:fd0d7bdfcdc2 21 */
mbed_official 0:fd0d7bdfcdc2 22 #ifndef MBED_SPISLAVE_H
mbed_official 0:fd0d7bdfcdc2 23 #define MBED_SPISLAVE_H
mbed_official 0:fd0d7bdfcdc2 24
mbed_official 0:fd0d7bdfcdc2 25 #include "platform.h"
mbed_official 0:fd0d7bdfcdc2 26
mbed_official 0:fd0d7bdfcdc2 27 #if DEVICE_SPISLAVE
mbed_official 0:fd0d7bdfcdc2 28
mbed_official 0:fd0d7bdfcdc2 29 #include "spi_api.h"
mbed_official 0:fd0d7bdfcdc2 30
mbed_official 0:fd0d7bdfcdc2 31 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 32
mbed_official 0:fd0d7bdfcdc2 33 /** A SPI slave, used for communicating with a SPI Master device
mbed_official 0:fd0d7bdfcdc2 34 *
mbed_official 0:fd0d7bdfcdc2 35 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
mbed_official 0:fd0d7bdfcdc2 36 *
mbed_official 0:fd0d7bdfcdc2 37 * Example:
mbed_official 0:fd0d7bdfcdc2 38 * @code
mbed_official 0:fd0d7bdfcdc2 39 * // Reply to a SPI master as slave
mbed_official 0:fd0d7bdfcdc2 40 *
mbed_official 0:fd0d7bdfcdc2 41 * #include "mbed.h"
mbed_official 0:fd0d7bdfcdc2 42 *
mbed_official 0:fd0d7bdfcdc2 43 * SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel
mbed_official 0:fd0d7bdfcdc2 44 *
mbed_official 0:fd0d7bdfcdc2 45 * int main() {
mbed_official 0:fd0d7bdfcdc2 46 * device.reply(0x00); // Prime SPI with first reply
mbed_official 0:fd0d7bdfcdc2 47 * while(1) {
mbed_official 0:fd0d7bdfcdc2 48 * if(device.receive()) {
mbed_official 0:fd0d7bdfcdc2 49 * int v = device.read(); // Read byte from master
mbed_official 0:fd0d7bdfcdc2 50 * v = (v + 1) % 0x100; // Add one to it, modulo 256
mbed_official 0:fd0d7bdfcdc2 51 * device.reply(v); // Make this the next reply
mbed_official 0:fd0d7bdfcdc2 52 * }
mbed_official 0:fd0d7bdfcdc2 53 * }
mbed_official 0:fd0d7bdfcdc2 54 * }
mbed_official 0:fd0d7bdfcdc2 55 * @endcode
mbed_official 0:fd0d7bdfcdc2 56 */
mbed_official 0:fd0d7bdfcdc2 57 class SPISlave {
mbed_official 0:fd0d7bdfcdc2 58
mbed_official 0:fd0d7bdfcdc2 59 public:
mbed_official 0:fd0d7bdfcdc2 60
mbed_official 0:fd0d7bdfcdc2 61 /** Create a SPI slave connected to the specified pins
mbed_official 0:fd0d7bdfcdc2 62 *
mbed_official 0:fd0d7bdfcdc2 63 * Pin Options:
mbed_official 0:fd0d7bdfcdc2 64 * (5, 6, 7i, 8) or (11, 12, 13, 14)
mbed_official 0:fd0d7bdfcdc2 65 *
mbed_official 0:fd0d7bdfcdc2 66 * mosi or miso can be specfied as NC if not used
mbed_official 0:fd0d7bdfcdc2 67 *
mbed_official 0:fd0d7bdfcdc2 68 * @param mosi SPI Master Out, Slave In pin
mbed_official 0:fd0d7bdfcdc2 69 * @param miso SPI Master In, Slave Out pin
mbed_official 0:fd0d7bdfcdc2 70 * @param sclk SPI Clock pin
mbed_official 0:fd0d7bdfcdc2 71 * @param ssel SPI chip select pin
mbed_official 0:fd0d7bdfcdc2 72 * @param name (optional) A string to identify the object
mbed_official 0:fd0d7bdfcdc2 73 */
mbed_official 0:fd0d7bdfcdc2 74 SPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel);
mbed_official 0:fd0d7bdfcdc2 75
mbed_official 0:fd0d7bdfcdc2 76 /** Configure the data transmission format
mbed_official 0:fd0d7bdfcdc2 77 *
mbed_official 0:fd0d7bdfcdc2 78 * @param bits Number of bits per SPI frame (4 - 16)
mbed_official 0:fd0d7bdfcdc2 79 * @param mode Clock polarity and phase mode (0 - 3)
mbed_official 0:fd0d7bdfcdc2 80 *
mbed_official 0:fd0d7bdfcdc2 81 * @code
mbed_official 0:fd0d7bdfcdc2 82 * mode | POL PHA
mbed_official 0:fd0d7bdfcdc2 83 * -----+--------
mbed_official 0:fd0d7bdfcdc2 84 * 0 | 0 0
mbed_official 0:fd0d7bdfcdc2 85 * 1 | 0 1
mbed_official 0:fd0d7bdfcdc2 86 * 2 | 1 0
mbed_official 0:fd0d7bdfcdc2 87 * 3 | 1 1
mbed_official 0:fd0d7bdfcdc2 88 * @endcode
mbed_official 0:fd0d7bdfcdc2 89 */
mbed_official 0:fd0d7bdfcdc2 90 void format(int bits, int mode = 0);
mbed_official 0:fd0d7bdfcdc2 91
mbed_official 0:fd0d7bdfcdc2 92 /** Set the spi bus clock frequency
mbed_official 0:fd0d7bdfcdc2 93 *
mbed_official 0:fd0d7bdfcdc2 94 * @param hz SCLK frequency in hz (default = 1MHz)
mbed_official 0:fd0d7bdfcdc2 95 */
mbed_official 0:fd0d7bdfcdc2 96 void frequency(int hz = 1000000);
mbed_official 0:fd0d7bdfcdc2 97
mbed_official 0:fd0d7bdfcdc2 98 /** Polls the SPI to see if data has been received
mbed_official 0:fd0d7bdfcdc2 99 *
mbed_official 0:fd0d7bdfcdc2 100 * @returns
mbed_official 0:fd0d7bdfcdc2 101 * 0 if no data,
mbed_official 0:fd0d7bdfcdc2 102 * 1 otherwise
mbed_official 0:fd0d7bdfcdc2 103 */
mbed_official 0:fd0d7bdfcdc2 104 int receive(void);
mbed_official 0:fd0d7bdfcdc2 105
mbed_official 0:fd0d7bdfcdc2 106 /** Retrieve data from receive buffer as slave
mbed_official 0:fd0d7bdfcdc2 107 *
mbed_official 0:fd0d7bdfcdc2 108 * @returns
mbed_official 0:fd0d7bdfcdc2 109 * the data in the receive buffer
mbed_official 0:fd0d7bdfcdc2 110 */
mbed_official 0:fd0d7bdfcdc2 111 int read(void);
mbed_official 0:fd0d7bdfcdc2 112
mbed_official 0:fd0d7bdfcdc2 113 /** Fill the transmission buffer with the value to be written out
mbed_official 0:fd0d7bdfcdc2 114 * as slave on the next received message from the master.
mbed_official 0:fd0d7bdfcdc2 115 *
mbed_official 0:fd0d7bdfcdc2 116 * @param value the data to be transmitted next
mbed_official 0:fd0d7bdfcdc2 117 */
mbed_official 0:fd0d7bdfcdc2 118 void reply(int value);
mbed_official 0:fd0d7bdfcdc2 119
mbed_official 0:fd0d7bdfcdc2 120 protected:
mbed_official 0:fd0d7bdfcdc2 121 spi_t _spi;
mbed_official 0:fd0d7bdfcdc2 122
mbed_official 0:fd0d7bdfcdc2 123 int _bits;
mbed_official 0:fd0d7bdfcdc2 124 int _mode;
mbed_official 0:fd0d7bdfcdc2 125 int _hz;
mbed_official 0:fd0d7bdfcdc2 126 };
mbed_official 0:fd0d7bdfcdc2 127
mbed_official 0:fd0d7bdfcdc2 128 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 129
mbed_official 0:fd0d7bdfcdc2 130 #endif
mbed_official 0:fd0d7bdfcdc2 131
mbed_official 0:fd0d7bdfcdc2 132 #endif