Visweswara R / PCA9672

PCA9672 Library (I2C IO Expander Interface)

Simple output port toggling with PCA9672

#include "mbed.h"
#include "PCA9672.h"

PCA9672 ioxp(P0_10, P0_11); //I2C connected to PCA9672 in LPC800-MAX

int main()
{
    ioxp.frequency(100000);

    while (1) {
        ioxp.write(0xFF);
        wait(.250);
        ioxp.write(0x00);
        wait(.250);
    }

}

PCA9672.h@0:27125e4cf941, 2013-09-21 (annotated)

Committer:
viswesr
Date:
Sat Sep 21 05:28:44 2013 +0000
Revision:
0:27125e4cf941
PCA9672 Library (I2C IO Expander Interface) : First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
viswesr 0:27125e4cf941 1 /* mbed PCA9672 I2C I/O Expander Library
viswesr 0:27125e4cf941 2 * Copyright (c) 2013 viswesr
viswesr 0:27125e4cf941 3 *
viswesr 0:27125e4cf941 4 * MIT License
viswesr 0:27125e4cf941 5 *
viswesr 0:27125e4cf941 6 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
viswesr 0:27125e4cf941 7 * and associated documentation files (the "Software"), to deal in the Software without restriction,
viswesr 0:27125e4cf941 8 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
viswesr 0:27125e4cf941 9 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
viswesr 0:27125e4cf941 10 * furnished to do so, subject to the following conditions:
viswesr 0:27125e4cf941 11 *
viswesr 0:27125e4cf941 12 * The above copyright notice and this permission notice shall be included in all copies or
viswesr 0:27125e4cf941 13 * substantial portions of the Software.
viswesr 0:27125e4cf941 14 *
viswesr 0:27125e4cf941 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
viswesr 0:27125e4cf941 16 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
viswesr 0:27125e4cf941 17 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
viswesr 0:27125e4cf941 18 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
viswesr 0:27125e4cf941 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
viswesr 0:27125e4cf941 20 */
viswesr 0:27125e4cf941 21
viswesr 0:27125e4cf941 22 #ifndef PCA9672_H
viswesr 0:27125e4cf941 23 #define PCA9672_H
viswesr 0:27125e4cf941 24
viswesr 0:27125e4cf941 25 #include "mbed.h"
viswesr 0:27125e4cf941 26
viswesr 0:27125e4cf941 27 // PCA9672 IIC slave address
viswesr 0:27125e4cf941 28 #define PCA9672_ADDR 0x46
viswesr 0:27125e4cf941 29
viswesr 0:27125e4cf941 30
viswesr 0:27125e4cf941 31 //!Library for the PCA9672 I/O expander.
viswesr 0:27125e4cf941 32 /*!
viswesr 0:27125e4cf941 33 The PCA9672 is an I2C I/O expander. It has 8 I/O pins.
viswesr 0:27125e4cf941 34 */
viswesr 0:27125e4cf941 35 class PCA9672
viswesr 0:27125e4cf941 36 {
viswesr 0:27125e4cf941 37 public:
viswesr 0:27125e4cf941 38 /*!
viswesr 0:27125e4cf941 39 Connect PCA9672 to I2C port pins sda and scl.
viswesr 0:27125e4cf941 40 */
viswesr 0:27125e4cf941 41 PCA9672(PinName sda, PinName scl);
viswesr 0:27125e4cf941 42
viswesr 0:27125e4cf941 43 /*!
viswesr 0:27125e4cf941 44 Set the frequency of the I2C interface.
viswesr 0:27125e4cf941 45 */
viswesr 0:27125e4cf941 46 void frequency(int hz);
viswesr 0:27125e4cf941 47
viswesr 0:27125e4cf941 48 /*!
viswesr 0:27125e4cf941 49 Write the value to the IO Expander (pins XP0-XP7 output)
viswesr 0:27125e4cf941 50 */
viswesr 0:27125e4cf941 51 void write(char value);
viswesr 0:27125e4cf941 52
viswesr 0:27125e4cf941 53 /*!
viswesr 0:27125e4cf941 54 Read the value of the IO Expander (pins XP0-XP7 input)
viswesr 0:27125e4cf941 55 */
viswesr 0:27125e4cf941 56 int read(void);
viswesr 0:27125e4cf941 57
viswesr 0:27125e4cf941 58 /*!
viswesr 0:27125e4cf941 59 Destroys instance.
viswesr 0:27125e4cf941 60 */
viswesr 0:27125e4cf941 61 ~PCA9672();
viswesr 0:27125e4cf941 62
viswesr 0:27125e4cf941 63 private:
viswesr 0:27125e4cf941 64
viswesr 0:27125e4cf941 65 I2C _i2c;
viswesr 0:27125e4cf941 66
viswesr 0:27125e4cf941 67 };
viswesr 0:27125e4cf941 68
viswesr 0:27125e4cf941 69 #endif