Jan Kamidra / PCF8574

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

PCF8574.h@3:47c298d4a41b, 2022-01-31 (annotated)

Committer:
JohnnyK
Date:
Mon Jan 31 18:26:50 2022 +0000
Revision:
3:47c298d4a41b
Parent:
2:e076d7b30aea
Child:
4:f93baeb6119c
Added Namespace IO for compatibility with TextLCD library

Who changed what in which revision?

UserRevisionLine numberNew 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
JohnnyK 2:e076d7b30aea 3 * 2022, 001: JohnnyK, Reworked Constructor to I2C object instead of I2C pins. I can be usefull with anoter I2C slave on same bus
JohnnyK 3:47c298d4a41b 4 * 2022, 002: JohnnyK, Added Namespace IO for compatibility with TextLCD library
simon 0:ab4e14b911ee 5 *
simon 0:ab4e14b911ee 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
simon 0:ab4e14b911ee 7 * of this software and associated documentation files (the "Software"), to deal
simon 0:ab4e14b911ee 8 * in the Software without restriction, including without limitation the rights
simon 0:ab4e14b911ee 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
simon 0:ab4e14b911ee 10 * copies of the Software, and to permit persons to whom the Software is
simon 0:ab4e14b911ee 11 * furnished to do so, subject to the following conditions:
simon 0:ab4e14b911ee 12 *
simon 0:ab4e14b911ee 13 * The above copyright notice and this permission notice shall be included in
simon 0:ab4e14b911ee 14 * all copies or substantial portions of the Software.
simon 0:ab4e14b911ee 15 *
simon 0:ab4e14b911ee 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
simon 0:ab4e14b911ee 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
simon 0:ab4e14b911ee 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
simon 0:ab4e14b911ee 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
simon 0:ab4e14b911ee 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
simon 0:ab4e14b911ee 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
simon 0:ab4e14b911ee 22 * THE SOFTWARE.
simon 0:ab4e14b911ee 23 */
simon 0:ab4e14b911ee 24
simon 0:ab4e14b911ee 25 #include "mbed.h"
simon 0:ab4e14b911ee 26
simon 0:ab4e14b911ee 27 #ifndef MBED_PCF8574_H
simon 0:ab4e14b911ee 28 #define MBED_PCF8574_H
simon 0:ab4e14b911ee 29
JohnnyK 3:47c298d4a41b 30 namespace IO{
simon 0:ab4e14b911ee 31
JohnnyK 3:47c298d4a41b 32 /** Interface to the popular PCF8574 I2C 8 Bit IO expander */
JohnnyK 3:47c298d4a41b 33 class PCF8574 {
JohnnyK 3:47c298d4a41b 34 public:
JohnnyK 3:47c298d4a41b 35 /** Create an instance of the PCF8574 connected I2C object, with the specified address.
JohnnyK 3:47c298d4a41b 36 *
JohnnyK 3:47c298d4a41b 37 * @param Mbed I2C object
JohnnyK 3:47c298d4a41b 38 * @param address The I2C address for this PCF8574
JohnnyK 3:47c298d4a41b 39 */
JohnnyK 3:47c298d4a41b 40 PCF8574(I2C *i2c, int address);
JohnnyK 3:47c298d4a41b 41
JohnnyK 3:47c298d4a41b 42 /** Read the IO pin level
JohnnyK 3:47c298d4a41b 43 *
JohnnyK 3:47c298d4a41b 44 * @return The byte read
JohnnyK 3:47c298d4a41b 45 */
JohnnyK 3:47c298d4a41b 46 int read();
JohnnyK 3:47c298d4a41b 47
JohnnyK 3:47c298d4a41b 48 /** Write to the IO pins
JohnnyK 3:47c298d4a41b 49 *
JohnnyK 3:47c298d4a41b 50 * @param data The 8 bits to write to the IO port
JohnnyK 3:47c298d4a41b 51 */
JohnnyK 3:47c298d4a41b 52 void write(int data);
JohnnyK 3:47c298d4a41b 53
JohnnyK 3:47c298d4a41b 54 private:
JohnnyK 3:47c298d4a41b 55 I2C *_i2c;
JohnnyK 3:47c298d4a41b 56 int _address;
JohnnyK 3:47c298d4a41b 57 };
JohnnyK 3:47c298d4a41b 58 }
simon 0:ab4e14b911ee 59
simon 0:ab4e14b911ee 60 #endif