Intelligent Systems / mbed-src

This fork of the MBED Library allows you to use counters on the external counter pins (15/16 for Timer 3, 29/30 for Timer 2) by switching internal timing functions in MBED to utilize Timer 0

Fork of mbed-src by mbed official

cpp/I2C.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_H
mbed_official 0:fd0d7bdfcdc2 23 #define MBED_I2C_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_I2C
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 Master, used for communicating with I2C slave devices
mbed_official 0:fd0d7bdfcdc2 34 *
mbed_official 0:fd0d7bdfcdc2 35 * Example:
mbed_official 0:fd0d7bdfcdc2 36 * @code
mbed_official 0:fd0d7bdfcdc2 37 * // Read from I2C slave at address 0x62
mbed_official 0:fd0d7bdfcdc2 38 *
mbed_official 0:fd0d7bdfcdc2 39 * #include "mbed.h"
mbed_official 0:fd0d7bdfcdc2 40 *
mbed_official 0:fd0d7bdfcdc2 41 * I2C i2c(p28, p27);
mbed_official 0:fd0d7bdfcdc2 42 *
mbed_official 0:fd0d7bdfcdc2 43 * int main() {
mbed_official 0:fd0d7bdfcdc2 44 * int address = 0x62;
mbed_official 0:fd0d7bdfcdc2 45 * char data[2];
mbed_official 0:fd0d7bdfcdc2 46 * i2c.read(address, data, 2);
mbed_official 0:fd0d7bdfcdc2 47 * }
mbed_official 0:fd0d7bdfcdc2 48 * @endcode
mbed_official 0:fd0d7bdfcdc2 49 */
mbed_official 0:fd0d7bdfcdc2 50 class I2C {
mbed_official 0:fd0d7bdfcdc2 51
mbed_official 0:fd0d7bdfcdc2 52 public:
mbed_official 0:fd0d7bdfcdc2 53 enum RxStatus {
mbed_official 0:fd0d7bdfcdc2 54 NoData,
mbed_official 0:fd0d7bdfcdc2 55 MasterGeneralCall,
mbed_official 0:fd0d7bdfcdc2 56 MasterWrite,
mbed_official 0:fd0d7bdfcdc2 57 MasterRead
mbed_official 0:fd0d7bdfcdc2 58 };
mbed_official 0:fd0d7bdfcdc2 59
mbed_official 0:fd0d7bdfcdc2 60 enum Acknowledge {
mbed_official 0:fd0d7bdfcdc2 61 NoACK = 0,
mbed_official 0:fd0d7bdfcdc2 62 ACK = 1
mbed_official 0:fd0d7bdfcdc2 63 };
mbed_official 0:fd0d7bdfcdc2 64
mbed_official 0:fd0d7bdfcdc2 65 /** Create an I2C Master interface, connected to the specified pins
mbed_official 0:fd0d7bdfcdc2 66 *
mbed_official 0:fd0d7bdfcdc2 67 * @param sda I2C data line pin
mbed_official 0:fd0d7bdfcdc2 68 * @param scl I2C clock line pin
mbed_official 0:fd0d7bdfcdc2 69 */
mbed_official 0:fd0d7bdfcdc2 70 I2C(PinName sda, PinName scl);
mbed_official 0:fd0d7bdfcdc2 71
mbed_official 0:fd0d7bdfcdc2 72 /** Set the frequency of the I2C interface
mbed_official 0:fd0d7bdfcdc2 73 *
mbed_official 0:fd0d7bdfcdc2 74 * @param hz The bus frequency in hertz
mbed_official 0:fd0d7bdfcdc2 75 */
mbed_official 0:fd0d7bdfcdc2 76 void frequency(int hz);
mbed_official 0:fd0d7bdfcdc2 77
mbed_official 0:fd0d7bdfcdc2 78 /** Read from an I2C slave
mbed_official 0:fd0d7bdfcdc2 79 *
mbed_official 0:fd0d7bdfcdc2 80 * Performs a complete read transaction. The bottom bit of
mbed_official 0:fd0d7bdfcdc2 81 * the address is forced to 1 to indicate a read.
mbed_official 0:fd0d7bdfcdc2 82 *
mbed_official 0:fd0d7bdfcdc2 83 * @param address 8-bit I2C slave address [ addr | 1 ]
mbed_official 0:fd0d7bdfcdc2 84 * @param data Pointer to the byte-array to read data in to
mbed_official 0:fd0d7bdfcdc2 85 * @param length Number of bytes to read
mbed_official 0:fd0d7bdfcdc2 86 * @param repeated Repeated start, true - don't send stop at end
mbed_official 0:fd0d7bdfcdc2 87 *
mbed_official 0:fd0d7bdfcdc2 88 * @returns
mbed_official 0:fd0d7bdfcdc2 89 * 0 on success (ack),
mbed_official 0:fd0d7bdfcdc2 90 * non-0 on failure (nack)
mbed_official 0:fd0d7bdfcdc2 91 */
mbed_official 0:fd0d7bdfcdc2 92 int read(int address, char *data, int length, bool repeated = false);
mbed_official 0:fd0d7bdfcdc2 93
mbed_official 0:fd0d7bdfcdc2 94 /** Read a single byte from the I2C bus
mbed_official 0:fd0d7bdfcdc2 95 *
mbed_official 0:fd0d7bdfcdc2 96 * @param ack indicates if the byte is to be acknowledged (1 = acknowledge)
mbed_official 0:fd0d7bdfcdc2 97 *
mbed_official 0:fd0d7bdfcdc2 98 * @returns
mbed_official 0:fd0d7bdfcdc2 99 * the byte read
mbed_official 0:fd0d7bdfcdc2 100 */
mbed_official 0:fd0d7bdfcdc2 101 int read(int ack);
mbed_official 0:fd0d7bdfcdc2 102
mbed_official 0:fd0d7bdfcdc2 103 /** Write to an I2C slave
mbed_official 0:fd0d7bdfcdc2 104 *
mbed_official 0:fd0d7bdfcdc2 105 * Performs a complete write transaction. The bottom bit of
mbed_official 0:fd0d7bdfcdc2 106 * the address is forced to 0 to indicate a write.
mbed_official 0:fd0d7bdfcdc2 107 *
mbed_official 0:fd0d7bdfcdc2 108 * @param address 8-bit I2C slave address [ addr | 0 ]
mbed_official 0:fd0d7bdfcdc2 109 * @param data Pointer to the byte-array data to send
mbed_official 0:fd0d7bdfcdc2 110 * @param length Number of bytes to send
mbed_official 0:fd0d7bdfcdc2 111 * @param repeated Repeated start, true - do not send stop at end
mbed_official 0:fd0d7bdfcdc2 112 *
mbed_official 0:fd0d7bdfcdc2 113 * @returns
mbed_official 0:fd0d7bdfcdc2 114 * 0 on success (ack),
mbed_official 0:fd0d7bdfcdc2 115 * non-0 on failure (nack)
mbed_official 0:fd0d7bdfcdc2 116 */
mbed_official 0:fd0d7bdfcdc2 117 int write(int address, const char *data, int length, bool repeated = false);
mbed_official 0:fd0d7bdfcdc2 118
mbed_official 0:fd0d7bdfcdc2 119 /** Write single byte out on the I2C bus
mbed_official 0:fd0d7bdfcdc2 120 *
mbed_official 0:fd0d7bdfcdc2 121 * @param data data to write out on bus
mbed_official 0:fd0d7bdfcdc2 122 *
mbed_official 0:fd0d7bdfcdc2 123 * @returns
mbed_official 0:fd0d7bdfcdc2 124 * '1' if an ACK was received,
mbed_official 0:fd0d7bdfcdc2 125 * '0' otherwise
mbed_official 0:fd0d7bdfcdc2 126 */
mbed_official 0:fd0d7bdfcdc2 127 int write(int data);
mbed_official 0:fd0d7bdfcdc2 128
mbed_official 0:fd0d7bdfcdc2 129 /** Creates a start condition on the I2C bus
mbed_official 0:fd0d7bdfcdc2 130 */
mbed_official 0:fd0d7bdfcdc2 131
mbed_official 0:fd0d7bdfcdc2 132 void start(void);
mbed_official 0:fd0d7bdfcdc2 133
mbed_official 0:fd0d7bdfcdc2 134 /** Creates a stop condition on the I2C bus
mbed_official 0:fd0d7bdfcdc2 135 */
mbed_official 0:fd0d7bdfcdc2 136 void stop(void);
mbed_official 0:fd0d7bdfcdc2 137
mbed_official 0:fd0d7bdfcdc2 138 protected:
mbed_official 0:fd0d7bdfcdc2 139 void aquire();
mbed_official 0:fd0d7bdfcdc2 140
mbed_official 0:fd0d7bdfcdc2 141 i2c_t _i2c;
mbed_official 0:fd0d7bdfcdc2 142 static I2C *_owner;
mbed_official 0:fd0d7bdfcdc2 143 int _hz;
mbed_official 0:fd0d7bdfcdc2 144 };
mbed_official 0:fd0d7bdfcdc2 145
mbed_official 0:fd0d7bdfcdc2 146 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 147
mbed_official 0:fd0d7bdfcdc2 148 #endif
mbed_official 0:fd0d7bdfcdc2 149
mbed_official 0:fd0d7bdfcdc2 150 #endif