Bernhard Filzmaier / mbed-src

mbed library sources

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api/SPI.h@13:0645d8841f51, 2013-08-05 (annotated)

Committer:
bogdanm
Date:
Mon Aug 05 14:12:34 2013 +0300
Revision:
13:0645d8841f51
Parent:
10:3bc89ef62ce7
Child:
50:b08ceb75017d
Update mbed sources to revision 64

Who changed what in which revision?

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bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
bogdanm 13:0645d8841f51 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #ifndef MBED_SPI_H
bogdanm 13:0645d8841f51 17 #define MBED_SPI_H
bogdanm 13:0645d8841f51 18
bogdanm 13:0645d8841f51 19 #include "platform.h"
bogdanm 13:0645d8841f51 20
bogdanm 13:0645d8841f51 21 #if DEVICE_SPI
bogdanm 13:0645d8841f51 22
bogdanm 13:0645d8841f51 23 #include "spi_api.h"
bogdanm 13:0645d8841f51 24
bogdanm 13:0645d8841f51 25 namespace mbed {
bogdanm 13:0645d8841f51 26
bogdanm 13:0645d8841f51 27 /** A SPI Master, used for communicating with SPI slave devices
bogdanm 13:0645d8841f51 28 *
bogdanm 13:0645d8841f51 29 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
bogdanm 13:0645d8841f51 30 *
bogdanm 13:0645d8841f51 31 * Most SPI devices will also require Chip Select and Reset signals. These
bogdanm 13:0645d8841f51 32 * can be controlled using <DigitalOut> pins
bogdanm 13:0645d8841f51 33 *
bogdanm 13:0645d8841f51 34 * Example:
bogdanm 13:0645d8841f51 35 * @code
bogdanm 13:0645d8841f51 36 * // Send a byte to a SPI slave, and record the response
bogdanm 13:0645d8841f51 37 *
bogdanm 13:0645d8841f51 38 * #include "mbed.h"
bogdanm 13:0645d8841f51 39 *
bogdanm 13:0645d8841f51 40 * SPI device(p5, p6, p7); // mosi, miso, sclk
bogdanm 13:0645d8841f51 41 *
bogdanm 13:0645d8841f51 42 * int main() {
bogdanm 13:0645d8841f51 43 * int response = device.write(0xFF);
bogdanm 13:0645d8841f51 44 * }
bogdanm 13:0645d8841f51 45 * @endcode
bogdanm 13:0645d8841f51 46 */
bogdanm 13:0645d8841f51 47 class SPI {
bogdanm 13:0645d8841f51 48
bogdanm 13:0645d8841f51 49 public:
bogdanm 13:0645d8841f51 50
bogdanm 13:0645d8841f51 51 /** Create a SPI master connected to the specified pins
bogdanm 13:0645d8841f51 52 *
bogdanm 13:0645d8841f51 53 * Pin Options:
bogdanm 13:0645d8841f51 54 * (5, 6, 7) or (11, 12, 13)
bogdanm 13:0645d8841f51 55 *
bogdanm 13:0645d8841f51 56 * mosi or miso can be specfied as NC if not used
bogdanm 13:0645d8841f51 57 *
bogdanm 13:0645d8841f51 58 * @param mosi SPI Master Out, Slave In pin
bogdanm 13:0645d8841f51 59 * @param miso SPI Master In, Slave Out pin
bogdanm 13:0645d8841f51 60 * @param sclk SPI Clock pin
bogdanm 13:0645d8841f51 61 */
bogdanm 13:0645d8841f51 62 SPI(PinName mosi, PinName miso, PinName sclk);
bogdanm 13:0645d8841f51 63
bogdanm 13:0645d8841f51 64 /** Configure the data transmission format
bogdanm 13:0645d8841f51 65 *
bogdanm 13:0645d8841f51 66 * @param bits Number of bits per SPI frame (4 - 16)
bogdanm 13:0645d8841f51 67 * @param mode Clock polarity and phase mode (0 - 3)
bogdanm 13:0645d8841f51 68 *
bogdanm 13:0645d8841f51 69 * @code
bogdanm 13:0645d8841f51 70 * mode | POL PHA
bogdanm 13:0645d8841f51 71 * -----+--------
bogdanm 13:0645d8841f51 72 * 0 | 0 0
bogdanm 13:0645d8841f51 73 * 1 | 0 1
bogdanm 13:0645d8841f51 74 * 2 | 1 0
bogdanm 13:0645d8841f51 75 * 3 | 1 1
bogdanm 13:0645d8841f51 76 * @endcode
bogdanm 13:0645d8841f51 77 */
bogdanm 13:0645d8841f51 78 void format(int bits, int mode = 0);
bogdanm 13:0645d8841f51 79
bogdanm 13:0645d8841f51 80 /** Set the spi bus clock frequency
bogdanm 13:0645d8841f51 81 *
bogdanm 13:0645d8841f51 82 * @param hz SCLK frequency in hz (default = 1MHz)
bogdanm 13:0645d8841f51 83 */
bogdanm 13:0645d8841f51 84 void frequency(int hz = 1000000);
bogdanm 13:0645d8841f51 85
bogdanm 13:0645d8841f51 86 /** Write to the SPI Slave and return the response
bogdanm 13:0645d8841f51 87 *
bogdanm 13:0645d8841f51 88 * @param value Data to be sent to the SPI slave
bogdanm 13:0645d8841f51 89 *
bogdanm 13:0645d8841f51 90 * @returns
bogdanm 13:0645d8841f51 91 * Response from the SPI slave
bogdanm 13:0645d8841f51 92 */
bogdanm 13:0645d8841f51 93 virtual int write(int value);
bogdanm 13:0645d8841f51 94
bogdanm 13:0645d8841f51 95 protected:
bogdanm 13:0645d8841f51 96 spi_t _spi;
bogdanm 13:0645d8841f51 97
bogdanm 13:0645d8841f51 98 void aquire(void);
bogdanm 13:0645d8841f51 99 static SPI *_owner;
bogdanm 13:0645d8841f51 100 int _bits;
bogdanm 13:0645d8841f51 101 int _mode;
bogdanm 13:0645d8841f51 102 int _hz;
bogdanm 13:0645d8841f51 103 };
bogdanm 13:0645d8841f51 104
bogdanm 13:0645d8841f51 105 } // namespace mbed
bogdanm 13:0645d8841f51 106
bogdanm 13:0645d8841f51 107 #endif
bogdanm 13:0645d8841f51 108
bogdanm 13:0645d8841f51 109 #endif