Paul Paterson / mbed-dev

mbed source development branch

Fork of mbed-dev by mbed official

drivers/I2CSlave.h@150:cd63f849362a, 2016-11-03 (annotated)

Committer:
ptpaterson
Date:
Thu Nov 03 16:21:53 2016 +0000
Revision:
150:cd63f849362a
Parent:
149:156823d33999 
targets LPC11Cxx, LPC15xx:  can_api can_filter function properly returns 0 if handle argument is out of bounds (handle > 32).

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #ifndef MBED_I2C_SLAVE_H
<> 149:156823d33999 17 #define MBED_I2C_SLAVE_H
<> 149:156823d33999 18
<> 149:156823d33999 19 #include "platform/platform.h"
<> 149:156823d33999 20
<> 149:156823d33999 21 #if DEVICE_I2CSLAVE
<> 149:156823d33999 22
<> 149:156823d33999 23 #include "hal/i2c_api.h"
<> 149:156823d33999 24
<> 149:156823d33999 25 namespace mbed {
<> 149:156823d33999 26 /** \addtogroup drivers */
<> 149:156823d33999 27 /** @{*/
<> 149:156823d33999 28
<> 149:156823d33999 29 /** An I2C Slave, used for communicating with an I2C Master device
<> 149:156823d33999 30 *
<> 149:156823d33999 31 * @Note Synchronization level: Not protected
<> 149:156823d33999 32 *
<> 149:156823d33999 33 * Example:
<> 149:156823d33999 34 * @code
<> 149:156823d33999 35 * // Simple I2C responder
<> 149:156823d33999 36 * #include <mbed.h>
<> 149:156823d33999 37 *
<> 149:156823d33999 38 * I2CSlave slave(p9, p10);
<> 149:156823d33999 39 *
<> 149:156823d33999 40 * int main() {
<> 149:156823d33999 41 * char buf[10];
<> 149:156823d33999 42 * char msg[] = "Slave!";
<> 149:156823d33999 43 *
<> 149:156823d33999 44 * slave.address(0xA0);
<> 149:156823d33999 45 * while (1) {
<> 149:156823d33999 46 * int i = slave.receive();
<> 149:156823d33999 47 * switch (i) {
<> 149:156823d33999 48 * case I2CSlave::ReadAddressed:
<> 149:156823d33999 49 * slave.write(msg, strlen(msg) + 1); // Includes null char
<> 149:156823d33999 50 * break;
<> 149:156823d33999 51 * case I2CSlave::WriteGeneral:
<> 149:156823d33999 52 * slave.read(buf, 10);
<> 149:156823d33999 53 * printf("Read G: %s\n", buf);
<> 149:156823d33999 54 * break;
<> 149:156823d33999 55 * case I2CSlave::WriteAddressed:
<> 149:156823d33999 56 * slave.read(buf, 10);
<> 149:156823d33999 57 * printf("Read A: %s\n", buf);
<> 149:156823d33999 58 * break;
<> 149:156823d33999 59 * }
<> 149:156823d33999 60 * for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer
<> 149:156823d33999 61 * }
<> 149:156823d33999 62 * }
<> 149:156823d33999 63 * @endcode
<> 149:156823d33999 64 */
<> 149:156823d33999 65 class I2CSlave {
<> 149:156823d33999 66
<> 149:156823d33999 67 public:
<> 149:156823d33999 68 enum RxStatus {
<> 149:156823d33999 69 NoData = 0,
<> 149:156823d33999 70 ReadAddressed = 1,
<> 149:156823d33999 71 WriteGeneral = 2,
<> 149:156823d33999 72 WriteAddressed = 3
<> 149:156823d33999 73 };
<> 149:156823d33999 74
<> 149:156823d33999 75 /** Create an I2C Slave interface, connected to the specified pins.
<> 149:156823d33999 76 *
<> 149:156823d33999 77 * @param sda I2C data line pin
<> 149:156823d33999 78 * @param scl I2C clock line pin
<> 149:156823d33999 79 */
<> 149:156823d33999 80 I2CSlave(PinName sda, PinName scl);
<> 149:156823d33999 81
<> 149:156823d33999 82 /** Set the frequency of the I2C interface
<> 149:156823d33999 83 *
<> 149:156823d33999 84 * @param hz The bus frequency in hertz
<> 149:156823d33999 85 */
<> 149:156823d33999 86 void frequency(int hz);
<> 149:156823d33999 87
<> 149:156823d33999 88 /** Checks to see if this I2C Slave has been addressed.
<> 149:156823d33999 89 *
<> 149:156823d33999 90 * @returns
<> 149:156823d33999 91 * A status indicating if the device has been addressed, and how
<> 149:156823d33999 92 * - NoData - the slave has not been addressed
<> 149:156823d33999 93 * - ReadAddressed - the master has requested a read from this slave
<> 149:156823d33999 94 * - WriteAddressed - the master is writing to this slave
<> 149:156823d33999 95 * - WriteGeneral - the master is writing to all slave
<> 149:156823d33999 96 */
<> 149:156823d33999 97 int receive(void);
<> 149:156823d33999 98
<> 149:156823d33999 99 /** Read from an I2C master.
<> 149:156823d33999 100 *
<> 149:156823d33999 101 * @param data pointer to the byte array to read data in to
<> 149:156823d33999 102 * @param length maximum number of bytes to read
<> 149:156823d33999 103 *
<> 149:156823d33999 104 * @returns
<> 149:156823d33999 105 * 0 on success,
<> 149:156823d33999 106 * non-0 otherwise
<> 149:156823d33999 107 */
<> 149:156823d33999 108 int read(char *data, int length);
<> 149:156823d33999 109
<> 149:156823d33999 110 /** Read a single byte from an I2C master.
<> 149:156823d33999 111 *
<> 149:156823d33999 112 * @returns
<> 149:156823d33999 113 * the byte read
<> 149:156823d33999 114 */
<> 149:156823d33999 115 int read(void);
<> 149:156823d33999 116
<> 149:156823d33999 117 /** Write to an I2C master.
<> 149:156823d33999 118 *
<> 149:156823d33999 119 * @param data pointer to the byte array to be transmitted
<> 149:156823d33999 120 * @param length the number of bytes to transmite
<> 149:156823d33999 121 *
<> 149:156823d33999 122 * @returns
<> 149:156823d33999 123 * 0 on success,
<> 149:156823d33999 124 * non-0 otherwise
<> 149:156823d33999 125 */
<> 149:156823d33999 126 int write(const char *data, int length);
<> 149:156823d33999 127
<> 149:156823d33999 128 /** Write a single byte to an I2C master.
<> 149:156823d33999 129 *
<> 149:156823d33999 130 * @data the byte to write
<> 149:156823d33999 131 *
<> 149:156823d33999 132 * @returns
<> 149:156823d33999 133 * '1' if an ACK was received,
<> 149:156823d33999 134 * '0' otherwise
<> 149:156823d33999 135 */
<> 149:156823d33999 136 int write(int data);
<> 149:156823d33999 137
<> 149:156823d33999 138 /** Sets the I2C slave address.
<> 149:156823d33999 139 *
<> 149:156823d33999 140 * @param address The address to set for the slave (ignoring the least
<> 149:156823d33999 141 * signifcant bit). If set to 0, the slave will only respond to the
<> 149:156823d33999 142 * general call address.
<> 149:156823d33999 143 */
<> 149:156823d33999 144 void address(int address);
<> 149:156823d33999 145
<> 149:156823d33999 146 /** Reset the I2C slave back into the known ready receiving state.
<> 149:156823d33999 147 */
<> 149:156823d33999 148 void stop(void);
<> 149:156823d33999 149
<> 149:156823d33999 150 protected:
<> 149:156823d33999 151 i2c_t _i2c;
<> 149:156823d33999 152 };
<> 149:156823d33999 153
<> 149:156823d33999 154 } // namespace mbed
<> 149:156823d33999 155
<> 149:156823d33999 156 #endif
<> 149:156823d33999 157
<> 149:156823d33999 158 #endif
<> 149:156823d33999 159
<> 149:156823d33999 160 /** @}*/