Maxim nexpaq / nexpaq_dev

Preliminary main mbed library for nexpaq development

hal/api/I2CSlave.h@0:6c56fb4bc5f0, 2016-11-04 (annotated)

Committer:
nexpaq
Date:
Fri Nov 04 20:27:58 2016 +0000
Revision:
0:6c56fb4bc5f0
Moving to library for sharing updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 0:6c56fb4bc5f0 1 /* mbed Microcontroller Library
nexpaq 0:6c56fb4bc5f0 2 * Copyright (c) 2006-2013 ARM Limited
nexpaq 0:6c56fb4bc5f0 3 *
nexpaq 0:6c56fb4bc5f0 4 * Licensed under the Apache License, Version 2.0 (the "License");
nexpaq 0:6c56fb4bc5f0 5 * you may not use this file except in compliance with the License.
nexpaq 0:6c56fb4bc5f0 6 * You may obtain a copy of the License at
nexpaq 0:6c56fb4bc5f0 7 *
nexpaq 0:6c56fb4bc5f0 8 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 0:6c56fb4bc5f0 9 *
nexpaq 0:6c56fb4bc5f0 10 * Unless required by applicable law or agreed to in writing, software
nexpaq 0:6c56fb4bc5f0 11 * distributed under the License is distributed on an "AS IS" BASIS,
nexpaq 0:6c56fb4bc5f0 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 0:6c56fb4bc5f0 13 * See the License for the specific language governing permissions and
nexpaq 0:6c56fb4bc5f0 14 * limitations under the License.
nexpaq 0:6c56fb4bc5f0 15 */
nexpaq 0:6c56fb4bc5f0 16 #ifndef MBED_I2C_SLAVE_H
nexpaq 0:6c56fb4bc5f0 17 #define MBED_I2C_SLAVE_H
nexpaq 0:6c56fb4bc5f0 18
nexpaq 0:6c56fb4bc5f0 19 #include "platform.h"
nexpaq 0:6c56fb4bc5f0 20
nexpaq 0:6c56fb4bc5f0 21 #if DEVICE_I2CSLAVE
nexpaq 0:6c56fb4bc5f0 22
nexpaq 0:6c56fb4bc5f0 23 #include "i2c_api.h"
nexpaq 0:6c56fb4bc5f0 24
nexpaq 0:6c56fb4bc5f0 25 namespace mbed {
nexpaq 0:6c56fb4bc5f0 26
nexpaq 0:6c56fb4bc5f0 27 /** An I2C Slave, used for communicating with an I2C Master device
nexpaq 0:6c56fb4bc5f0 28 *
nexpaq 0:6c56fb4bc5f0 29 * @Note Synchronization level: Not protected
nexpaq 0:6c56fb4bc5f0 30 *
nexpaq 0:6c56fb4bc5f0 31 * Example:
nexpaq 0:6c56fb4bc5f0 32 * @code
nexpaq 0:6c56fb4bc5f0 33 * // Simple I2C responder
nexpaq 0:6c56fb4bc5f0 34 * #include <mbed.h>
nexpaq 0:6c56fb4bc5f0 35 *
nexpaq 0:6c56fb4bc5f0 36 * I2CSlave slave(p9, p10);
nexpaq 0:6c56fb4bc5f0 37 *
nexpaq 0:6c56fb4bc5f0 38 * int main() {
nexpaq 0:6c56fb4bc5f0 39 * char buf[10];
nexpaq 0:6c56fb4bc5f0 40 * char msg[] = "Slave!";
nexpaq 0:6c56fb4bc5f0 41 *
nexpaq 0:6c56fb4bc5f0 42 * slave.address(0xA0);
nexpaq 0:6c56fb4bc5f0 43 * while (1) {
nexpaq 0:6c56fb4bc5f0 44 * int i = slave.receive();
nexpaq 0:6c56fb4bc5f0 45 * switch (i) {
nexpaq 0:6c56fb4bc5f0 46 * case I2CSlave::ReadAddressed:
nexpaq 0:6c56fb4bc5f0 47 * slave.write(msg, strlen(msg) + 1); // Includes null char
nexpaq 0:6c56fb4bc5f0 48 * break;
nexpaq 0:6c56fb4bc5f0 49 * case I2CSlave::WriteGeneral:
nexpaq 0:6c56fb4bc5f0 50 * slave.read(buf, 10);
nexpaq 0:6c56fb4bc5f0 51 * printf("Read G: %s\n", buf);
nexpaq 0:6c56fb4bc5f0 52 * break;
nexpaq 0:6c56fb4bc5f0 53 * case I2CSlave::WriteAddressed:
nexpaq 0:6c56fb4bc5f0 54 * slave.read(buf, 10);
nexpaq 0:6c56fb4bc5f0 55 * printf("Read A: %s\n", buf);
nexpaq 0:6c56fb4bc5f0 56 * break;
nexpaq 0:6c56fb4bc5f0 57 * }
nexpaq 0:6c56fb4bc5f0 58 * for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer
nexpaq 0:6c56fb4bc5f0 59 * }
nexpaq 0:6c56fb4bc5f0 60 * }
nexpaq 0:6c56fb4bc5f0 61 * @endcode
nexpaq 0:6c56fb4bc5f0 62 */
nexpaq 0:6c56fb4bc5f0 63 class I2CSlave {
nexpaq 0:6c56fb4bc5f0 64
nexpaq 0:6c56fb4bc5f0 65 public:
nexpaq 0:6c56fb4bc5f0 66 enum RxStatus {
nexpaq 0:6c56fb4bc5f0 67 NoData = 0,
nexpaq 0:6c56fb4bc5f0 68 ReadAddressed = 1,
nexpaq 0:6c56fb4bc5f0 69 WriteGeneral = 2,
nexpaq 0:6c56fb4bc5f0 70 WriteAddressed = 3
nexpaq 0:6c56fb4bc5f0 71 };
nexpaq 0:6c56fb4bc5f0 72
nexpaq 0:6c56fb4bc5f0 73 /** Create an I2C Slave interface, connected to the specified pins.
nexpaq 0:6c56fb4bc5f0 74 *
nexpaq 0:6c56fb4bc5f0 75 * @param sda I2C data line pin
nexpaq 0:6c56fb4bc5f0 76 * @param scl I2C clock line pin
nexpaq 0:6c56fb4bc5f0 77 */
nexpaq 0:6c56fb4bc5f0 78 I2CSlave(PinName sda, PinName scl);
nexpaq 0:6c56fb4bc5f0 79
nexpaq 0:6c56fb4bc5f0 80 /** Set the frequency of the I2C interface
nexpaq 0:6c56fb4bc5f0 81 *
nexpaq 0:6c56fb4bc5f0 82 * @param hz The bus frequency in hertz
nexpaq 0:6c56fb4bc5f0 83 */
nexpaq 0:6c56fb4bc5f0 84 void frequency(int hz);
nexpaq 0:6c56fb4bc5f0 85
nexpaq 0:6c56fb4bc5f0 86 /** Checks to see if this I2C Slave has been addressed.
nexpaq 0:6c56fb4bc5f0 87 *
nexpaq 0:6c56fb4bc5f0 88 * @returns
nexpaq 0:6c56fb4bc5f0 89 * A status indicating if the device has been addressed, and how
nexpaq 0:6c56fb4bc5f0 90 * - NoData - the slave has not been addressed
nexpaq 0:6c56fb4bc5f0 91 * - ReadAddressed - the master has requested a read from this slave
nexpaq 0:6c56fb4bc5f0 92 * - WriteAddressed - the master is writing to this slave
nexpaq 0:6c56fb4bc5f0 93 * - WriteGeneral - the master is writing to all slave
nexpaq 0:6c56fb4bc5f0 94 */
nexpaq 0:6c56fb4bc5f0 95 int receive(void);
nexpaq 0:6c56fb4bc5f0 96
nexpaq 0:6c56fb4bc5f0 97 /** Read from an I2C master.
nexpaq 0:6c56fb4bc5f0 98 *
nexpaq 0:6c56fb4bc5f0 99 * @param data pointer to the byte array to read data in to
nexpaq 0:6c56fb4bc5f0 100 * @param length maximum number of bytes to read
nexpaq 0:6c56fb4bc5f0 101 *
nexpaq 0:6c56fb4bc5f0 102 * @returns
nexpaq 0:6c56fb4bc5f0 103 * 0 on success,
nexpaq 0:6c56fb4bc5f0 104 * non-0 otherwise
nexpaq 0:6c56fb4bc5f0 105 */
nexpaq 0:6c56fb4bc5f0 106 int read(char *data, int length);
nexpaq 0:6c56fb4bc5f0 107
nexpaq 0:6c56fb4bc5f0 108 /** Read a single byte from an I2C master.
nexpaq 0:6c56fb4bc5f0 109 *
nexpaq 0:6c56fb4bc5f0 110 * @returns
nexpaq 0:6c56fb4bc5f0 111 * the byte read
nexpaq 0:6c56fb4bc5f0 112 */
nexpaq 0:6c56fb4bc5f0 113 int read(void);
nexpaq 0:6c56fb4bc5f0 114
nexpaq 0:6c56fb4bc5f0 115 /** Write to an I2C master.
nexpaq 0:6c56fb4bc5f0 116 *
nexpaq 0:6c56fb4bc5f0 117 * @param data pointer to the byte array to be transmitted
nexpaq 0:6c56fb4bc5f0 118 * @param length the number of bytes to transmite
nexpaq 0:6c56fb4bc5f0 119 *
nexpaq 0:6c56fb4bc5f0 120 * @returns
nexpaq 0:6c56fb4bc5f0 121 * 0 on success,
nexpaq 0:6c56fb4bc5f0 122 * non-0 otherwise
nexpaq 0:6c56fb4bc5f0 123 */
nexpaq 0:6c56fb4bc5f0 124 int write(const char *data, int length);
nexpaq 0:6c56fb4bc5f0 125
nexpaq 0:6c56fb4bc5f0 126 /** Write a single byte to an I2C master.
nexpaq 0:6c56fb4bc5f0 127 *
nexpaq 0:6c56fb4bc5f0 128 * @data the byte to write
nexpaq 0:6c56fb4bc5f0 129 *
nexpaq 0:6c56fb4bc5f0 130 * @returns
nexpaq 0:6c56fb4bc5f0 131 * '1' if an ACK was received,
nexpaq 0:6c56fb4bc5f0 132 * '0' otherwise
nexpaq 0:6c56fb4bc5f0 133 */
nexpaq 0:6c56fb4bc5f0 134 int write(int data);
nexpaq 0:6c56fb4bc5f0 135
nexpaq 0:6c56fb4bc5f0 136 /** Sets the I2C slave address.
nexpaq 0:6c56fb4bc5f0 137 *
nexpaq 0:6c56fb4bc5f0 138 * @param address The address to set for the slave (ignoring the least
nexpaq 0:6c56fb4bc5f0 139 * signifcant bit). If set to 0, the slave will only respond to the
nexpaq 0:6c56fb4bc5f0 140 * general call address.
nexpaq 0:6c56fb4bc5f0 141 */
nexpaq 0:6c56fb4bc5f0 142 void address(int address);
nexpaq 0:6c56fb4bc5f0 143
nexpaq 0:6c56fb4bc5f0 144 /** Reset the I2C slave back into the known ready receiving state.
nexpaq 0:6c56fb4bc5f0 145 */
nexpaq 0:6c56fb4bc5f0 146 void stop(void);
nexpaq 0:6c56fb4bc5f0 147
nexpaq 0:6c56fb4bc5f0 148 protected:
nexpaq 0:6c56fb4bc5f0 149 i2c_t _i2c;
nexpaq 0:6c56fb4bc5f0 150 };
nexpaq 0:6c56fb4bc5f0 151
nexpaq 0:6c56fb4bc5f0 152 } // namespace mbed
nexpaq 0:6c56fb4bc5f0 153
nexpaq 0:6c56fb4bc5f0 154 #endif
nexpaq 0:6c56fb4bc5f0 155
nexpaq 0:6c56fb4bc5f0 156 #endif