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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

Import librarymbed

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

cpp/I2CSlave.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

Who changed what in which revision?

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_I2C_SLAVE_H
mbed_official 0:fd0d7bdfcdc2 23 #define MBED_I2C_SLAVE_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_I2CSLAVE
mbed_official 0:fd0d7bdfcdc2 28
mbed_official 0:fd0d7bdfcdc2 29 #include "i2c_api.h"
mbed_official 0:fd0d7bdfcdc2 30
mbed_official 0:fd0d7bdfcdc2 31 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 32
mbed_official 0:fd0d7bdfcdc2 33 /** An I2C Slave, used for communicating with an I2C Master device
mbed_official 0:fd0d7bdfcdc2 34 *
mbed_official 0:fd0d7bdfcdc2 35 * Example:
mbed_official 0:fd0d7bdfcdc2 36 * @code
mbed_official 0:fd0d7bdfcdc2 37 * // Simple I2C responder
mbed_official 0:fd0d7bdfcdc2 38 * #include <mbed.h>
mbed_official 0:fd0d7bdfcdc2 39 *
mbed_official 0:fd0d7bdfcdc2 40 * I2CSlave slave(p9, p10);
mbed_official 0:fd0d7bdfcdc2 41 *
mbed_official 0:fd0d7bdfcdc2 42 * int main() {
mbed_official 0:fd0d7bdfcdc2 43 * char buf[10];
mbed_official 0:fd0d7bdfcdc2 44 * char msg[] = "Slave!";
mbed_official 0:fd0d7bdfcdc2 45 *
mbed_official 0:fd0d7bdfcdc2 46 * slave.address(0xA0);
mbed_official 0:fd0d7bdfcdc2 47 * while (1) {
mbed_official 0:fd0d7bdfcdc2 48 * int i = slave.receive();
mbed_official 0:fd0d7bdfcdc2 49 * switch (i) {
mbed_official 0:fd0d7bdfcdc2 50 * case I2CSlave::ReadAddressed:
mbed_official 0:fd0d7bdfcdc2 51 * slave.write(msg, strlen(msg) + 1); // Includes null char
mbed_official 0:fd0d7bdfcdc2 52 * break;
mbed_official 0:fd0d7bdfcdc2 53 * case I2CSlave::WriteGeneral:
mbed_official 0:fd0d7bdfcdc2 54 * slave.read(buf, 10);
mbed_official 0:fd0d7bdfcdc2 55 * printf("Read G: %s\n", buf);
mbed_official 0:fd0d7bdfcdc2 56 * break;
mbed_official 0:fd0d7bdfcdc2 57 * case I2CSlave::WriteAddressed:
mbed_official 0:fd0d7bdfcdc2 58 * slave.read(buf, 10);
mbed_official 0:fd0d7bdfcdc2 59 * printf("Read A: %s\n", buf);
mbed_official 0:fd0d7bdfcdc2 60 * break;
mbed_official 0:fd0d7bdfcdc2 61 * }
mbed_official 0:fd0d7bdfcdc2 62 * for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer
mbed_official 0:fd0d7bdfcdc2 63 * }
mbed_official 0:fd0d7bdfcdc2 64 * }
mbed_official 0:fd0d7bdfcdc2 65 * @endcode
mbed_official 0:fd0d7bdfcdc2 66 */
mbed_official 0:fd0d7bdfcdc2 67 class I2CSlave {
mbed_official 0:fd0d7bdfcdc2 68
mbed_official 0:fd0d7bdfcdc2 69 public:
mbed_official 0:fd0d7bdfcdc2 70 enum RxStatus {
mbed_official 0:fd0d7bdfcdc2 71 NoData = 0,
mbed_official 0:fd0d7bdfcdc2 72 ReadAddressed = 1,
mbed_official 0:fd0d7bdfcdc2 73 WriteGeneral = 2,
mbed_official 0:fd0d7bdfcdc2 74 WriteAddressed = 3
mbed_official 0:fd0d7bdfcdc2 75 };
mbed_official 0:fd0d7bdfcdc2 76
mbed_official 0:fd0d7bdfcdc2 77 /** Create an I2C Slave interface, connected to the specified pins.
mbed_official 0:fd0d7bdfcdc2 78 *
mbed_official 0:fd0d7bdfcdc2 79 * @param sda I2C data line pin
mbed_official 0:fd0d7bdfcdc2 80 * @param scl I2C clock line pin
mbed_official 0:fd0d7bdfcdc2 81 */
mbed_official 0:fd0d7bdfcdc2 82 I2CSlave(PinName sda, PinName scl);
mbed_official 0:fd0d7bdfcdc2 83
mbed_official 0:fd0d7bdfcdc2 84 /** Set the frequency of the I2C interface
mbed_official 0:fd0d7bdfcdc2 85 *
mbed_official 0:fd0d7bdfcdc2 86 * @param hz The bus frequency in hertz
mbed_official 0:fd0d7bdfcdc2 87 */
mbed_official 0:fd0d7bdfcdc2 88 void frequency(int hz);
mbed_official 0:fd0d7bdfcdc2 89
mbed_official 0:fd0d7bdfcdc2 90 /** Checks to see if this I2C Slave has been addressed.
mbed_official 0:fd0d7bdfcdc2 91 *
mbed_official 0:fd0d7bdfcdc2 92 * @returns
mbed_official 0:fd0d7bdfcdc2 93 * A status indicating if the device has been addressed, and how
mbed_official 0:fd0d7bdfcdc2 94 * - NoData - the slave has not been addressed
mbed_official 0:fd0d7bdfcdc2 95 * - ReadAddressed - the master has requested a read from this slave
mbed_official 0:fd0d7bdfcdc2 96 * - WriteAddressed - the master is writing to this slave
mbed_official 0:fd0d7bdfcdc2 97 * - WriteGeneral - the master is writing to all slave
mbed_official 0:fd0d7bdfcdc2 98 */
mbed_official 0:fd0d7bdfcdc2 99 int receive(void);
mbed_official 0:fd0d7bdfcdc2 100
mbed_official 0:fd0d7bdfcdc2 101 /** Read from an I2C master.
mbed_official 0:fd0d7bdfcdc2 102 *
mbed_official 0:fd0d7bdfcdc2 103 * @param data pointer to the byte array to read data in to
mbed_official 0:fd0d7bdfcdc2 104 * @param length maximum number of bytes to read
mbed_official 0:fd0d7bdfcdc2 105 *
mbed_official 0:fd0d7bdfcdc2 106 * @returns
mbed_official 0:fd0d7bdfcdc2 107 * 0 on success,
mbed_official 0:fd0d7bdfcdc2 108 * non-0 otherwise
mbed_official 0:fd0d7bdfcdc2 109 */
mbed_official 0:fd0d7bdfcdc2 110 int read(char *data, int length);
mbed_official 0:fd0d7bdfcdc2 111
mbed_official 0:fd0d7bdfcdc2 112 /** Read a single byte from an I2C master.
mbed_official 0:fd0d7bdfcdc2 113 *
mbed_official 0:fd0d7bdfcdc2 114 * @returns
mbed_official 0:fd0d7bdfcdc2 115 * the byte read
mbed_official 0:fd0d7bdfcdc2 116 */
mbed_official 0:fd0d7bdfcdc2 117 int read(void);
mbed_official 0:fd0d7bdfcdc2 118
mbed_official 0:fd0d7bdfcdc2 119 /** Write to an I2C master.
mbed_official 0:fd0d7bdfcdc2 120 *
mbed_official 0:fd0d7bdfcdc2 121 * @param data pointer to the byte array to be transmitted
mbed_official 0:fd0d7bdfcdc2 122 * @param length the number of bytes to transmite
mbed_official 0:fd0d7bdfcdc2 123 *
mbed_official 0:fd0d7bdfcdc2 124 * @returns
mbed_official 0:fd0d7bdfcdc2 125 * 0 on success,
mbed_official 0:fd0d7bdfcdc2 126 * non-0 otherwise
mbed_official 0:fd0d7bdfcdc2 127 */
mbed_official 0:fd0d7bdfcdc2 128 int write(const char *data, int length);
mbed_official 0:fd0d7bdfcdc2 129
mbed_official 0:fd0d7bdfcdc2 130 /** Write a single byte to an I2C master.
mbed_official 0:fd0d7bdfcdc2 131 *
mbed_official 0:fd0d7bdfcdc2 132 * @data the byte to write
mbed_official 0:fd0d7bdfcdc2 133 *
mbed_official 0:fd0d7bdfcdc2 134 * @returns
mbed_official 0:fd0d7bdfcdc2 135 * '1' if an ACK was received,
mbed_official 0:fd0d7bdfcdc2 136 * '0' otherwise
mbed_official 0:fd0d7bdfcdc2 137 */
mbed_official 0:fd0d7bdfcdc2 138 int write(int data);
mbed_official 0:fd0d7bdfcdc2 139
mbed_official 0:fd0d7bdfcdc2 140 /** Sets the I2C slave address.
mbed_official 0:fd0d7bdfcdc2 141 *
mbed_official 0:fd0d7bdfcdc2 142 * @param address The address to set for the slave (ignoring the least
mbed_official 0:fd0d7bdfcdc2 143 * signifcant bit). If set to 0, the slave will only respond to the
mbed_official 0:fd0d7bdfcdc2 144 * general call address.
mbed_official 0:fd0d7bdfcdc2 145 */
mbed_official 0:fd0d7bdfcdc2 146 void address(int address);
mbed_official 0:fd0d7bdfcdc2 147
mbed_official 0:fd0d7bdfcdc2 148 /** Reset the I2C slave back into the known ready receiving state.
mbed_official 0:fd0d7bdfcdc2 149 */
mbed_official 0:fd0d7bdfcdc2 150 void stop(void);
mbed_official 0:fd0d7bdfcdc2 151
mbed_official 0:fd0d7bdfcdc2 152 protected:
mbed_official 0:fd0d7bdfcdc2 153 i2c_t _i2c;
mbed_official 0:fd0d7bdfcdc2 154 };
mbed_official 0:fd0d7bdfcdc2 155
mbed_official 0:fd0d7bdfcdc2 156 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 157
mbed_official 0:fd0d7bdfcdc2 158 #endif
mbed_official 0:fd0d7bdfcdc2 159
mbed_official 0:fd0d7bdfcdc2 160 #endif