Simon Ford
PCF8574 I2C IO Expander Interface
Dependents: PCF8574_HelloWorld PCF8574_I2C_4x4_Keypad PCF8574_I2C_4x4_Keypad_interface PCF8574_ButtonPress
PCF8574.h@1:ec8da0c59403, 2010-06-03 (annotated)
- Committer:
- simon
- Date:
- Thu Jun 03 13:00:49 2010 +0000
- Revision:
- 1:ec8da0c59403
- Parent:
- 0:ab4e14b911ee
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| simon | 0:ab4e14b911ee | 1 | /* mbed PCF8574 Library, for driving the I2C I/O Expander |
| simon | 0:ab4e14b911ee | 2 | * Copyright (c) 2008-2010, cstyles, sford |
| simon | 0:ab4e14b911ee | 3 | * |
| simon | 0:ab4e14b911ee | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| simon | 0:ab4e14b911ee | 5 | * of this software and associated documentation files (the "Software"), to deal |
| simon | 0:ab4e14b911ee | 6 | * in the Software without restriction, including without limitation the rights |
| simon | 0:ab4e14b911ee | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| simon | 0:ab4e14b911ee | 8 | * copies of the Software, and to permit persons to whom the Software is |
| simon | 0:ab4e14b911ee | 9 | * furnished to do so, subject to the following conditions: |
| simon | 0:ab4e14b911ee | 10 | * |
| simon | 0:ab4e14b911ee | 11 | * The above copyright notice and this permission notice shall be included in |
| simon | 0:ab4e14b911ee | 12 | * all copies or substantial portions of the Software. |
| simon | 0:ab4e14b911ee | 13 | * |
| simon | 0:ab4e14b911ee | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| simon | 0:ab4e14b911ee | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| simon | 0:ab4e14b911ee | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| simon | 0:ab4e14b911ee | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| simon | 0:ab4e14b911ee | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| simon | 0:ab4e14b911ee | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| simon | 0:ab4e14b911ee | 20 | * THE SOFTWARE. |
| simon | 0:ab4e14b911ee | 21 | */ |
| simon | 0:ab4e14b911ee | 22 | |
| simon | 0:ab4e14b911ee | 23 | #include "mbed.h" |
| simon | 0:ab4e14b911ee | 24 | |
| simon | 0:ab4e14b911ee | 25 | #ifndef MBED_PCF8574_H |
| simon | 0:ab4e14b911ee | 26 | #define MBED_PCF8574_H |
| simon | 0:ab4e14b911ee | 27 | |
| simon | 0:ab4e14b911ee | 28 | /** Interface to the popular PCF8574 I2C 8 Bit IO expander */ |
| simon | 0:ab4e14b911ee | 29 | class PCF8574 { |
| simon | 0:ab4e14b911ee | 30 | public: |
| simon | 0:ab4e14b911ee | 31 | /** Create an instance of the PCF8574 connected to specfied I2C pins, with the specified address. |
| simon | 0:ab4e14b911ee | 32 | * |
| simon | 0:ab4e14b911ee | 33 | * @param sda The I2C data pin |
| simon | 0:ab4e14b911ee | 34 | * @param scl The I2C clock pin |
| simon | 0:ab4e14b911ee | 35 | * @param address The I2C address for this PCF8574 |
| simon | 0:ab4e14b911ee | 36 | */ |
| simon | 0:ab4e14b911ee | 37 | PCF8574(PinName sda, PinName scl, int address); |
| simon | 0:ab4e14b911ee | 38 | |
| simon | 0:ab4e14b911ee | 39 | /** Read the IO pin level |
| simon | 0:ab4e14b911ee | 40 | * |
| simon | 0:ab4e14b911ee | 41 | * @return The byte read |
| simon | 0:ab4e14b911ee | 42 | */ |
| simon | 0:ab4e14b911ee | 43 | int read(); |
| simon | 0:ab4e14b911ee | 44 | |
| simon | 0:ab4e14b911ee | 45 | /** Write to the IO pins |
| simon | 0:ab4e14b911ee | 46 | * |
| simon | 0:ab4e14b911ee | 47 | * @param data The 8 bits to write to the IO port |
| simon | 0:ab4e14b911ee | 48 | */ |
| simon | 0:ab4e14b911ee | 49 | void write(int data); |
| simon | 0:ab4e14b911ee | 50 | |
| simon | 0:ab4e14b911ee | 51 | private: |
| simon | 0:ab4e14b911ee | 52 | I2C _i2c; |
| simon | 0:ab4e14b911ee | 53 | int _address; |
| simon | 0:ab4e14b911ee | 54 | }; |
| simon | 0:ab4e14b911ee | 55 | |
| simon | 0:ab4e14b911ee | 56 | #endif |