Mateusz Kowalik / Application_danix

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Fork of Application by Daniel Sygut

mbed-dev/drivers/I2CSlave.h@15:2a20c3d2616e, 2018-02-15 (annotated)

Committer:
Zaitsev
Date:
Thu Feb 15 14:29:23 2018 +0000
Revision:
15:2a20c3d2616e
Parent:
10:41552d038a69 
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Zaitsev 10:41552d038a69 1 /* mbed Microcontroller Library
Zaitsev 10:41552d038a69 2 * Copyright (c) 2006-2013 ARM Limited
Zaitsev 10:41552d038a69 3 *
Zaitsev 10:41552d038a69 4 * Licensed under the Apache License, Version 2.0 (the "License");
Zaitsev 10:41552d038a69 5 * you may not use this file except in compliance with the License.
Zaitsev 10:41552d038a69 6 * You may obtain a copy of the License at
Zaitsev 10:41552d038a69 7 *
Zaitsev 10:41552d038a69 8 * http://www.apache.org/licenses/LICENSE-2.0
Zaitsev 10:41552d038a69 9 *
Zaitsev 10:41552d038a69 10 * Unless required by applicable law or agreed to in writing, software
Zaitsev 10:41552d038a69 11 * distributed under the License is distributed on an "AS IS" BASIS,
Zaitsev 10:41552d038a69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Zaitsev 10:41552d038a69 13 * See the License for the specific language governing permissions and
Zaitsev 10:41552d038a69 14 * limitations under the License.
Zaitsev 10:41552d038a69 15 */
Zaitsev 10:41552d038a69 16 #ifndef MBED_I2C_SLAVE_H
Zaitsev 10:41552d038a69 17 #define MBED_I2C_SLAVE_H
Zaitsev 10:41552d038a69 18
Zaitsev 10:41552d038a69 19 #include "platform/platform.h"
Zaitsev 10:41552d038a69 20
Zaitsev 10:41552d038a69 21 #if DEVICE_I2CSLAVE
Zaitsev 10:41552d038a69 22
Zaitsev 10:41552d038a69 23 #include "hal/i2c_api.h"
Zaitsev 10:41552d038a69 24
Zaitsev 10:41552d038a69 25 namespace mbed {
Zaitsev 10:41552d038a69 26 /** \addtogroup drivers */
Zaitsev 10:41552d038a69 27 /** @{*/
Zaitsev 10:41552d038a69 28
Zaitsev 10:41552d038a69 29 /** An I2C Slave, used for communicating with an I2C Master device
Zaitsev 10:41552d038a69 30 *
Zaitsev 10:41552d038a69 31 * @Note Synchronization level: Not protected
Zaitsev 10:41552d038a69 32 *
Zaitsev 10:41552d038a69 33 * Example:
Zaitsev 10:41552d038a69 34 * @code
Zaitsev 10:41552d038a69 35 * // Simple I2C responder
Zaitsev 10:41552d038a69 36 * #include <mbed.h>
Zaitsev 10:41552d038a69 37 *
Zaitsev 10:41552d038a69 38 * I2CSlave slave(p9, p10);
Zaitsev 10:41552d038a69 39 *
Zaitsev 10:41552d038a69 40 * int main() {
Zaitsev 10:41552d038a69 41 * char buf[10];
Zaitsev 10:41552d038a69 42 * char msg[] = "Slave!";
Zaitsev 10:41552d038a69 43 *
Zaitsev 10:41552d038a69 44 * slave.address(0xA0);
Zaitsev 10:41552d038a69 45 * while (1) {
Zaitsev 10:41552d038a69 46 * int i = slave.receive();
Zaitsev 10:41552d038a69 47 * switch (i) {
Zaitsev 10:41552d038a69 48 * case I2CSlave::ReadAddressed:
Zaitsev 10:41552d038a69 49 * slave.write(msg, strlen(msg) + 1); // Includes null char
Zaitsev 10:41552d038a69 50 * break;
Zaitsev 10:41552d038a69 51 * case I2CSlave::WriteGeneral:
Zaitsev 10:41552d038a69 52 * slave.read(buf, 10);
Zaitsev 10:41552d038a69 53 * printf("Read G: %s\n", buf);
Zaitsev 10:41552d038a69 54 * break;
Zaitsev 10:41552d038a69 55 * case I2CSlave::WriteAddressed:
Zaitsev 10:41552d038a69 56 * slave.read(buf, 10);
Zaitsev 10:41552d038a69 57 * printf("Read A: %s\n", buf);
Zaitsev 10:41552d038a69 58 * break;
Zaitsev 10:41552d038a69 59 * }
Zaitsev 10:41552d038a69 60 * for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer
Zaitsev 10:41552d038a69 61 * }
Zaitsev 10:41552d038a69 62 * }
Zaitsev 10:41552d038a69 63 * @endcode
Zaitsev 10:41552d038a69 64 */
Zaitsev 10:41552d038a69 65 class I2CSlave {
Zaitsev 10:41552d038a69 66
Zaitsev 10:41552d038a69 67 public:
Zaitsev 10:41552d038a69 68 enum RxStatus {
Zaitsev 10:41552d038a69 69 NoData = 0,
Zaitsev 10:41552d038a69 70 ReadAddressed = 1,
Zaitsev 10:41552d038a69 71 WriteGeneral = 2,
Zaitsev 10:41552d038a69 72 WriteAddressed = 3
Zaitsev 10:41552d038a69 73 };
Zaitsev 10:41552d038a69 74
Zaitsev 10:41552d038a69 75 /** Create an I2C Slave interface, connected to the specified pins.
Zaitsev 10:41552d038a69 76 *
Zaitsev 10:41552d038a69 77 * @param sda I2C data line pin
Zaitsev 10:41552d038a69 78 * @param scl I2C clock line pin
Zaitsev 10:41552d038a69 79 */
Zaitsev 10:41552d038a69 80 I2CSlave(PinName sda, PinName scl);
Zaitsev 10:41552d038a69 81
Zaitsev 10:41552d038a69 82 /** Set the frequency of the I2C interface
Zaitsev 10:41552d038a69 83 *
Zaitsev 10:41552d038a69 84 * @param hz The bus frequency in hertz
Zaitsev 10:41552d038a69 85 */
Zaitsev 10:41552d038a69 86 void frequency(int hz);
Zaitsev 10:41552d038a69 87
Zaitsev 10:41552d038a69 88 /** Checks to see if this I2C Slave has been addressed.
Zaitsev 10:41552d038a69 89 *
Zaitsev 10:41552d038a69 90 * @returns
Zaitsev 10:41552d038a69 91 * A status indicating if the device has been addressed, and how
Zaitsev 10:41552d038a69 92 * - NoData - the slave has not been addressed
Zaitsev 10:41552d038a69 93 * - ReadAddressed - the master has requested a read from this slave
Zaitsev 10:41552d038a69 94 * - WriteAddressed - the master is writing to this slave
Zaitsev 10:41552d038a69 95 * - WriteGeneral - the master is writing to all slave
Zaitsev 10:41552d038a69 96 */
Zaitsev 10:41552d038a69 97 int receive(void);
Zaitsev 10:41552d038a69 98
Zaitsev 10:41552d038a69 99 /** Read from an I2C master.
Zaitsev 10:41552d038a69 100 *
Zaitsev 10:41552d038a69 101 * @param data pointer to the byte array to read data in to
Zaitsev 10:41552d038a69 102 * @param length maximum number of bytes to read
Zaitsev 10:41552d038a69 103 *
Zaitsev 10:41552d038a69 104 * @returns
Zaitsev 10:41552d038a69 105 * 0 on success,
Zaitsev 10:41552d038a69 106 * non-0 otherwise
Zaitsev 10:41552d038a69 107 */
Zaitsev 10:41552d038a69 108 int read(char *data, int length);
Zaitsev 10:41552d038a69 109
Zaitsev 10:41552d038a69 110 /** Read a single byte from an I2C master.
Zaitsev 10:41552d038a69 111 *
Zaitsev 10:41552d038a69 112 * @returns
Zaitsev 10:41552d038a69 113 * the byte read
Zaitsev 10:41552d038a69 114 */
Zaitsev 10:41552d038a69 115 int read(void);
Zaitsev 10:41552d038a69 116
Zaitsev 10:41552d038a69 117 /** Write to an I2C master.
Zaitsev 10:41552d038a69 118 *
Zaitsev 10:41552d038a69 119 * @param data pointer to the byte array to be transmitted
Zaitsev 10:41552d038a69 120 * @param length the number of bytes to transmite
Zaitsev 10:41552d038a69 121 *
Zaitsev 10:41552d038a69 122 * @returns
Zaitsev 10:41552d038a69 123 * 0 on success,
Zaitsev 10:41552d038a69 124 * non-0 otherwise
Zaitsev 10:41552d038a69 125 */
Zaitsev 10:41552d038a69 126 int write(const char *data, int length);
Zaitsev 10:41552d038a69 127
Zaitsev 10:41552d038a69 128 /** Write a single byte to an I2C master.
Zaitsev 10:41552d038a69 129 *
Zaitsev 10:41552d038a69 130 * @data the byte to write
Zaitsev 10:41552d038a69 131 *
Zaitsev 10:41552d038a69 132 * @returns
Zaitsev 10:41552d038a69 133 * '1' if an ACK was received,
Zaitsev 10:41552d038a69 134 * '0' otherwise
Zaitsev 10:41552d038a69 135 */
Zaitsev 10:41552d038a69 136 int write(int data);
Zaitsev 10:41552d038a69 137
Zaitsev 10:41552d038a69 138 /** Sets the I2C slave address.
Zaitsev 10:41552d038a69 139 *
Zaitsev 10:41552d038a69 140 * @param address The address to set for the slave (ignoring the least
Zaitsev 10:41552d038a69 141 * signifcant bit). If set to 0, the slave will only respond to the
Zaitsev 10:41552d038a69 142 * general call address.
Zaitsev 10:41552d038a69 143 */
Zaitsev 10:41552d038a69 144 void address(int address);
Zaitsev 10:41552d038a69 145
Zaitsev 10:41552d038a69 146 /** Reset the I2C slave back into the known ready receiving state.
Zaitsev 10:41552d038a69 147 */
Zaitsev 10:41552d038a69 148 void stop(void);
Zaitsev 10:41552d038a69 149
Zaitsev 10:41552d038a69 150 protected:
Zaitsev 10:41552d038a69 151 i2c_t _i2c;
Zaitsev 10:41552d038a69 152 };
Zaitsev 10:41552d038a69 153
Zaitsev 10:41552d038a69 154 } // namespace mbed
Zaitsev 10:41552d038a69 155
Zaitsev 10:41552d038a69 156 #endif
Zaitsev 10:41552d038a69 157
Zaitsev 10:41552d038a69 158 #endif
Zaitsev 10:41552d038a69 159
Zaitsev 10:41552d038a69 160 /** @}*/