George Roussos / BLE_Temperature

BLE temperature profile using digital DS1820 or analog LM35 sensors

Dependencies:   DS1820

mbed/I2C.h@0:637031152314, 2015-03-07 (annotated)

Committer:
gkroussos
Date:
Sat Mar 07 16:23:41 2015 +0000
Revision:
0:637031152314
Working version 1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gkroussos 0:637031152314 1 /* mbed Microcontroller Library
gkroussos 0:637031152314 2 * Copyright (c) 2006-2013 ARM Limited
gkroussos 0:637031152314 3 *
gkroussos 0:637031152314 4 * Licensed under the Apache License, Version 2.0 (the "License");
gkroussos 0:637031152314 5 * you may not use this file except in compliance with the License.
gkroussos 0:637031152314 6 * You may obtain a copy of the License at
gkroussos 0:637031152314 7 *
gkroussos 0:637031152314 8 * http://www.apache.org/licenses/LICENSE-2.0
gkroussos 0:637031152314 9 *
gkroussos 0:637031152314 10 * Unless required by applicable law or agreed to in writing, software
gkroussos 0:637031152314 11 * distributed under the License is distributed on an "AS IS" BASIS,
gkroussos 0:637031152314 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
gkroussos 0:637031152314 13 * See the License for the specific language governing permissions and
gkroussos 0:637031152314 14 * limitations under the License.
gkroussos 0:637031152314 15 */
gkroussos 0:637031152314 16 #ifndef MBED_I2C_H
gkroussos 0:637031152314 17 #define MBED_I2C_H
gkroussos 0:637031152314 18
gkroussos 0:637031152314 19 #include "platform.h"
gkroussos 0:637031152314 20
gkroussos 0:637031152314 21 #if DEVICE_I2C
gkroussos 0:637031152314 22
gkroussos 0:637031152314 23 #include "i2c_api.h"
gkroussos 0:637031152314 24
gkroussos 0:637031152314 25 namespace mbed {
gkroussos 0:637031152314 26
gkroussos 0:637031152314 27 /** An I2C Master, used for communicating with I2C slave devices
gkroussos 0:637031152314 28 *
gkroussos 0:637031152314 29 * Example:
gkroussos 0:637031152314 30 * @code
gkroussos 0:637031152314 31 * // Read from I2C slave at address 0x62
gkroussos 0:637031152314 32 *
gkroussos 0:637031152314 33 * #include "mbed.h"
gkroussos 0:637031152314 34 *
gkroussos 0:637031152314 35 * I2C i2c(p28, p27);
gkroussos 0:637031152314 36 *
gkroussos 0:637031152314 37 * int main() {
gkroussos 0:637031152314 38 * int address = 0x62;
gkroussos 0:637031152314 39 * char data[2];
gkroussos 0:637031152314 40 * i2c.read(address, data, 2);
gkroussos 0:637031152314 41 * }
gkroussos 0:637031152314 42 * @endcode
gkroussos 0:637031152314 43 */
gkroussos 0:637031152314 44 class I2C {
gkroussos 0:637031152314 45
gkroussos 0:637031152314 46 public:
gkroussos 0:637031152314 47 enum RxStatus {
gkroussos 0:637031152314 48 NoData,
gkroussos 0:637031152314 49 MasterGeneralCall,
gkroussos 0:637031152314 50 MasterWrite,
gkroussos 0:637031152314 51 MasterRead
gkroussos 0:637031152314 52 };
gkroussos 0:637031152314 53
gkroussos 0:637031152314 54 enum Acknowledge {
gkroussos 0:637031152314 55 NoACK = 0,
gkroussos 0:637031152314 56 ACK = 1
gkroussos 0:637031152314 57 };
gkroussos 0:637031152314 58
gkroussos 0:637031152314 59 /** Create an I2C Master interface, connected to the specified pins
gkroussos 0:637031152314 60 *
gkroussos 0:637031152314 61 * @param sda I2C data line pin
gkroussos 0:637031152314 62 * @param scl I2C clock line pin
gkroussos 0:637031152314 63 */
gkroussos 0:637031152314 64 I2C(PinName sda, PinName scl);
gkroussos 0:637031152314 65
gkroussos 0:637031152314 66 /** Set the frequency of the I2C interface
gkroussos 0:637031152314 67 *
gkroussos 0:637031152314 68 * @param hz The bus frequency in hertz
gkroussos 0:637031152314 69 */
gkroussos 0:637031152314 70 void frequency(int hz);
gkroussos 0:637031152314 71
gkroussos 0:637031152314 72 /** Read from an I2C slave
gkroussos 0:637031152314 73 *
gkroussos 0:637031152314 74 * Performs a complete read transaction. The bottom bit of
gkroussos 0:637031152314 75 * the address is forced to 1 to indicate a read.
gkroussos 0:637031152314 76 *
gkroussos 0:637031152314 77 * @param address 8-bit I2C slave address [ addr | 1 ]
gkroussos 0:637031152314 78 * @param data Pointer to the byte-array to read data in to
gkroussos 0:637031152314 79 * @param length Number of bytes to read
gkroussos 0:637031152314 80 * @param repeated Repeated start, true - don't send stop at end
gkroussos 0:637031152314 81 *
gkroussos 0:637031152314 82 * @returns
gkroussos 0:637031152314 83 * 0 on success (ack),
gkroussos 0:637031152314 84 * non-0 on failure (nack)
gkroussos 0:637031152314 85 */
gkroussos 0:637031152314 86 int read(int address, char *data, int length, bool repeated = false);
gkroussos 0:637031152314 87
gkroussos 0:637031152314 88 /** Read a single byte from the I2C bus
gkroussos 0:637031152314 89 *
gkroussos 0:637031152314 90 * @param ack indicates if the byte is to be acknowledged (1 = acknowledge)
gkroussos 0:637031152314 91 *
gkroussos 0:637031152314 92 * @returns
gkroussos 0:637031152314 93 * the byte read
gkroussos 0:637031152314 94 */
gkroussos 0:637031152314 95 int read(int ack);
gkroussos 0:637031152314 96
gkroussos 0:637031152314 97 /** Write to an I2C slave
gkroussos 0:637031152314 98 *
gkroussos 0:637031152314 99 * Performs a complete write transaction. The bottom bit of
gkroussos 0:637031152314 100 * the address is forced to 0 to indicate a write.
gkroussos 0:637031152314 101 *
gkroussos 0:637031152314 102 * @param address 8-bit I2C slave address [ addr | 0 ]
gkroussos 0:637031152314 103 * @param data Pointer to the byte-array data to send
gkroussos 0:637031152314 104 * @param length Number of bytes to send
gkroussos 0:637031152314 105 * @param repeated Repeated start, true - do not send stop at end
gkroussos 0:637031152314 106 *
gkroussos 0:637031152314 107 * @returns
gkroussos 0:637031152314 108 * 0 on success (ack),
gkroussos 0:637031152314 109 * non-0 on failure (nack)
gkroussos 0:637031152314 110 */
gkroussos 0:637031152314 111 int write(int address, const char *data, int length, bool repeated = false);
gkroussos 0:637031152314 112
gkroussos 0:637031152314 113 /** Write single byte out on the I2C bus
gkroussos 0:637031152314 114 *
gkroussos 0:637031152314 115 * @param data data to write out on bus
gkroussos 0:637031152314 116 *
gkroussos 0:637031152314 117 * @returns
gkroussos 0:637031152314 118 * '1' if an ACK was received,
gkroussos 0:637031152314 119 * '0' otherwise
gkroussos 0:637031152314 120 */
gkroussos 0:637031152314 121 int write(int data);
gkroussos 0:637031152314 122
gkroussos 0:637031152314 123 /** Creates a start condition on the I2C bus
gkroussos 0:637031152314 124 */
gkroussos 0:637031152314 125
gkroussos 0:637031152314 126 void start(void);
gkroussos 0:637031152314 127
gkroussos 0:637031152314 128 /** Creates a stop condition on the I2C bus
gkroussos 0:637031152314 129 */
gkroussos 0:637031152314 130 void stop(void);
gkroussos 0:637031152314 131
gkroussos 0:637031152314 132 protected:
gkroussos 0:637031152314 133 void aquire();
gkroussos 0:637031152314 134
gkroussos 0:637031152314 135 i2c_t _i2c;
gkroussos 0:637031152314 136 static I2C *_owner;
gkroussos 0:637031152314 137 int _hz;
gkroussos 0:637031152314 138 };
gkroussos 0:637031152314 139
gkroussos 0:637031152314 140 } // namespace mbed
gkroussos 0:637031152314 141
gkroussos 0:637031152314 142 #endif
gkroussos 0:637031152314 143
gkroussos 0:637031152314 144 #endif