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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

api/SPI.h@212:34d62c0b2af6, 2014-05-26 (annotated)

Committer:
mbed_official
Date:
Mon May 26 18:15:07 2014 +0100
Revision:
212:34d62c0b2af6
Parent:
50:b08ceb75017d
Child:
525:c320967f86b9
Synchronized with git revision f65b7d907785089e8dd942446f1c974b3a213a39



Full URL: https://github.com/mbedmicro/mbed/commit/f65b7d907785089e8dd942446f1c974b3a213a39/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
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 */
mbed_official 50:b08ceb75017d 62 SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused=NC);
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
mbed_official 212:34d62c0b2af6 95 public:
mbed_official 212:34d62c0b2af6 96 virtual ~SPI() {
mbed_official 212:34d62c0b2af6 97 }
mbed_official 212:34d62c0b2af6 98
bogdanm 13:0645d8841f51 99 protected:
bogdanm 13:0645d8841f51 100 spi_t _spi;
bogdanm 13:0645d8841f51 101
bogdanm 13:0645d8841f51 102 void aquire(void);
bogdanm 13:0645d8841f51 103 static SPI *_owner;
bogdanm 13:0645d8841f51 104 int _bits;
bogdanm 13:0645d8841f51 105 int _mode;
bogdanm 13:0645d8841f51 106 int _hz;
bogdanm 13:0645d8841f51 107 };
bogdanm 13:0645d8841f51 108
bogdanm 13:0645d8841f51 109 } // namespace mbed
bogdanm 13:0645d8841f51 110
bogdanm 13:0645d8841f51 111 #endif
bogdanm 13:0645d8841f51 112
bogdanm 13:0645d8841f51 113 #endif