PCF8574 I2C IO Expander Interface
Dependents: PCF8574_HelloWorld PCF8574_I2C_4x4_Keypad PCF8574_I2C_4x4_Keypad_interface PCF8574_ButtonPress
PCF8574.cpp@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 "PCF8574.h" |
simon | 0:ab4e14b911ee | 24 | #include "mbed.h" |
simon | 0:ab4e14b911ee | 25 | |
simon | 0:ab4e14b911ee | 26 | PCF8574::PCF8574(PinName sda, PinName scl, int address) |
simon | 0:ab4e14b911ee | 27 | : _i2c(sda, scl) { |
simon | 0:ab4e14b911ee | 28 | _address = address; |
simon | 0:ab4e14b911ee | 29 | } |
simon | 0:ab4e14b911ee | 30 | |
simon | 0:ab4e14b911ee | 31 | int PCF8574::read() { |
simon | 0:ab4e14b911ee | 32 | char foo[1]; |
simon | 1:ec8da0c59403 | 33 | _i2c.read(_address, foo, 1); |
simon | 0:ab4e14b911ee | 34 | return foo[0]; |
simon | 0:ab4e14b911ee | 35 | } |
simon | 0:ab4e14b911ee | 36 | |
simon | 0:ab4e14b911ee | 37 | void PCF8574::write(int data) { |
simon | 0:ab4e14b911ee | 38 | char foo[1]; |
simon | 0:ab4e14b911ee | 39 | foo[0] = data; |
simon | 1:ec8da0c59403 | 40 | _i2c.write(_address, foo, 1); |
simon | 0:ab4e14b911ee | 41 | } |