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cpp/I2CSlave.h@2:143cac498751, 2013-02-18 (annotated)

Committer:
emilmont
Date:
Mon Feb 18 11:44:18 2013 +0000
Revision:
2:143cac498751
Parent:
0:fd0d7bdfcdc2 
Update mbed sources to Rev 59

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
emilmont 2:143cac498751 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
emilmont 2:143cac498751 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 2:143cac498751 5 * you may not use this file except in compliance with the License.
emilmont 2:143cac498751 6 * You may obtain a copy of the License at
mbed_official 0:fd0d7bdfcdc2 7 *
emilmont 2:143cac498751 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:fd0d7bdfcdc2 9 *
emilmont 2:143cac498751 10 * Unless required by applicable law or agreed to in writing, software
emilmont 2:143cac498751 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 2:143cac498751 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 2:143cac498751 13 * See the License for the specific language governing permissions and
emilmont 2:143cac498751 14 * limitations under the License.
mbed_official 0:fd0d7bdfcdc2 15 */
mbed_official 0:fd0d7bdfcdc2 16 #ifndef MBED_I2C_SLAVE_H
mbed_official 0:fd0d7bdfcdc2 17 #define MBED_I2C_SLAVE_H
mbed_official 0:fd0d7bdfcdc2 18
mbed_official 0:fd0d7bdfcdc2 19 #include "platform.h"
mbed_official 0:fd0d7bdfcdc2 20
mbed_official 0:fd0d7bdfcdc2 21 #if DEVICE_I2CSLAVE
mbed_official 0:fd0d7bdfcdc2 22
mbed_official 0:fd0d7bdfcdc2 23 #include "i2c_api.h"
mbed_official 0:fd0d7bdfcdc2 24
mbed_official 0:fd0d7bdfcdc2 25 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 26
mbed_official 0:fd0d7bdfcdc2 27 /** An I2C Slave, used for communicating with an I2C Master device
mbed_official 0:fd0d7bdfcdc2 28 *
mbed_official 0:fd0d7bdfcdc2 29 * Example:
mbed_official 0:fd0d7bdfcdc2 30 * @code
mbed_official 0:fd0d7bdfcdc2 31 * // Simple I2C responder
mbed_official 0:fd0d7bdfcdc2 32 * #include <mbed.h>
mbed_official 0:fd0d7bdfcdc2 33 *
mbed_official 0:fd0d7bdfcdc2 34 * I2CSlave slave(p9, p10);
mbed_official 0:fd0d7bdfcdc2 35 *
mbed_official 0:fd0d7bdfcdc2 36 * int main() {
mbed_official 0:fd0d7bdfcdc2 37 * char buf[10];
mbed_official 0:fd0d7bdfcdc2 38 * char msg[] = "Slave!";
mbed_official 0:fd0d7bdfcdc2 39 *
mbed_official 0:fd0d7bdfcdc2 40 * slave.address(0xA0);
mbed_official 0:fd0d7bdfcdc2 41 * while (1) {
mbed_official 0:fd0d7bdfcdc2 42 * int i = slave.receive();
mbed_official 0:fd0d7bdfcdc2 43 * switch (i) {
emilmont 2:143cac498751 44 * case I2CSlave::ReadAddressed:
mbed_official 0:fd0d7bdfcdc2 45 * slave.write(msg, strlen(msg) + 1); // Includes null char
mbed_official 0:fd0d7bdfcdc2 46 * break;
mbed_official 0:fd0d7bdfcdc2 47 * case I2CSlave::WriteGeneral:
mbed_official 0:fd0d7bdfcdc2 48 * slave.read(buf, 10);
mbed_official 0:fd0d7bdfcdc2 49 * printf("Read G: %s\n", buf);
mbed_official 0:fd0d7bdfcdc2 50 * break;
mbed_official 0:fd0d7bdfcdc2 51 * case I2CSlave::WriteAddressed:
mbed_official 0:fd0d7bdfcdc2 52 * slave.read(buf, 10);
mbed_official 0:fd0d7bdfcdc2 53 * printf("Read A: %s\n", buf);
mbed_official 0:fd0d7bdfcdc2 54 * break;
mbed_official 0:fd0d7bdfcdc2 55 * }
mbed_official 0:fd0d7bdfcdc2 56 * for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer
mbed_official 0:fd0d7bdfcdc2 57 * }
mbed_official 0:fd0d7bdfcdc2 58 * }
emilmont 2:143cac498751 59 * @endcode
mbed_official 0:fd0d7bdfcdc2 60 */
mbed_official 0:fd0d7bdfcdc2 61 class I2CSlave {
mbed_official 0:fd0d7bdfcdc2 62
mbed_official 0:fd0d7bdfcdc2 63 public:
mbed_official 0:fd0d7bdfcdc2 64 enum RxStatus {
mbed_official 0:fd0d7bdfcdc2 65 NoData = 0,
mbed_official 0:fd0d7bdfcdc2 66 ReadAddressed = 1,
mbed_official 0:fd0d7bdfcdc2 67 WriteGeneral = 2,
mbed_official 0:fd0d7bdfcdc2 68 WriteAddressed = 3
mbed_official 0:fd0d7bdfcdc2 69 };
mbed_official 0:fd0d7bdfcdc2 70
mbed_official 0:fd0d7bdfcdc2 71 /** Create an I2C Slave interface, connected to the specified pins.
mbed_official 0:fd0d7bdfcdc2 72 *
mbed_official 0:fd0d7bdfcdc2 73 * @param sda I2C data line pin
mbed_official 0:fd0d7bdfcdc2 74 * @param scl I2C clock line pin
mbed_official 0:fd0d7bdfcdc2 75 */
mbed_official 0:fd0d7bdfcdc2 76 I2CSlave(PinName sda, PinName scl);
mbed_official 0:fd0d7bdfcdc2 77
mbed_official 0:fd0d7bdfcdc2 78 /** Set the frequency of the I2C interface
mbed_official 0:fd0d7bdfcdc2 79 *
mbed_official 0:fd0d7bdfcdc2 80 * @param hz The bus frequency in hertz
mbed_official 0:fd0d7bdfcdc2 81 */
mbed_official 0:fd0d7bdfcdc2 82 void frequency(int hz);
mbed_official 0:fd0d7bdfcdc2 83
mbed_official 0:fd0d7bdfcdc2 84 /** Checks to see if this I2C Slave has been addressed.
mbed_official 0:fd0d7bdfcdc2 85 *
mbed_official 0:fd0d7bdfcdc2 86 * @returns
mbed_official 0:fd0d7bdfcdc2 87 * A status indicating if the device has been addressed, and how
mbed_official 0:fd0d7bdfcdc2 88 * - NoData - the slave has not been addressed
mbed_official 0:fd0d7bdfcdc2 89 * - ReadAddressed - the master has requested a read from this slave
mbed_official 0:fd0d7bdfcdc2 90 * - WriteAddressed - the master is writing to this slave
emilmont 2:143cac498751 91 * - WriteGeneral - the master is writing to all slave
mbed_official 0:fd0d7bdfcdc2 92 */
mbed_official 0:fd0d7bdfcdc2 93 int receive(void);
mbed_official 0:fd0d7bdfcdc2 94
mbed_official 0:fd0d7bdfcdc2 95 /** Read from an I2C master.
mbed_official 0:fd0d7bdfcdc2 96 *
mbed_official 0:fd0d7bdfcdc2 97 * @param data pointer to the byte array to read data in to
mbed_official 0:fd0d7bdfcdc2 98 * @param length maximum number of bytes to read
mbed_official 0:fd0d7bdfcdc2 99 *
mbed_official 0:fd0d7bdfcdc2 100 * @returns
mbed_official 0:fd0d7bdfcdc2 101 * 0 on success,
mbed_official 0:fd0d7bdfcdc2 102 * non-0 otherwise
mbed_official 0:fd0d7bdfcdc2 103 */
emilmont 2:143cac498751 104 int read(char *data, int length);
mbed_official 0:fd0d7bdfcdc2 105
mbed_official 0:fd0d7bdfcdc2 106 /** Read a single byte from an I2C master.
mbed_official 0:fd0d7bdfcdc2 107 *
mbed_official 0:fd0d7bdfcdc2 108 * @returns
mbed_official 0:fd0d7bdfcdc2 109 * the byte read
mbed_official 0:fd0d7bdfcdc2 110 */
mbed_official 0:fd0d7bdfcdc2 111 int read(void);
mbed_official 0:fd0d7bdfcdc2 112
mbed_official 0:fd0d7bdfcdc2 113 /** Write to an I2C master.
mbed_official 0:fd0d7bdfcdc2 114 *
mbed_official 0:fd0d7bdfcdc2 115 * @param data pointer to the byte array to be transmitted
mbed_official 0:fd0d7bdfcdc2 116 * @param length the number of bytes to transmite
mbed_official 0:fd0d7bdfcdc2 117 *
mbed_official 0:fd0d7bdfcdc2 118 * @returns
mbed_official 0:fd0d7bdfcdc2 119 * 0 on success,
mbed_official 0:fd0d7bdfcdc2 120 * non-0 otherwise
mbed_official 0:fd0d7bdfcdc2 121 */
mbed_official 0:fd0d7bdfcdc2 122 int write(const char *data, int length);
mbed_official 0:fd0d7bdfcdc2 123
mbed_official 0:fd0d7bdfcdc2 124 /** Write a single byte to an I2C master.
mbed_official 0:fd0d7bdfcdc2 125 *
mbed_official 0:fd0d7bdfcdc2 126 * @data the byte to write
mbed_official 0:fd0d7bdfcdc2 127 *
mbed_official 0:fd0d7bdfcdc2 128 * @returns
mbed_official 0:fd0d7bdfcdc2 129 * '1' if an ACK was received,
mbed_official 0:fd0d7bdfcdc2 130 * '0' otherwise
mbed_official 0:fd0d7bdfcdc2 131 */
mbed_official 0:fd0d7bdfcdc2 132 int write(int data);
mbed_official 0:fd0d7bdfcdc2 133
mbed_official 0:fd0d7bdfcdc2 134 /** Sets the I2C slave address.
mbed_official 0:fd0d7bdfcdc2 135 *
mbed_official 0:fd0d7bdfcdc2 136 * @param address The address to set for the slave (ignoring the least
mbed_official 0:fd0d7bdfcdc2 137 * signifcant bit). If set to 0, the slave will only respond to the
mbed_official 0:fd0d7bdfcdc2 138 * general call address.
mbed_official 0:fd0d7bdfcdc2 139 */
mbed_official 0:fd0d7bdfcdc2 140 void address(int address);
mbed_official 0:fd0d7bdfcdc2 141
mbed_official 0:fd0d7bdfcdc2 142 /** Reset the I2C slave back into the known ready receiving state.
mbed_official 0:fd0d7bdfcdc2 143 */
mbed_official 0:fd0d7bdfcdc2 144 void stop(void);
mbed_official 0:fd0d7bdfcdc2 145
mbed_official 0:fd0d7bdfcdc2 146 protected:
mbed_official 0:fd0d7bdfcdc2 147 i2c_t _i2c;
mbed_official 0:fd0d7bdfcdc2 148 };
mbed_official 0:fd0d7bdfcdc2 149
mbed_official 0:fd0d7bdfcdc2 150 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 151
mbed_official 0:fd0d7bdfcdc2 152 #endif
mbed_official 0:fd0d7bdfcdc2 153
mbed_official 0:fd0d7bdfcdc2 154 #endif