PCF8574IO library for MbedCE

Library for interfacing 8bit (8 pins) PCF8574 I2C GPIO expender under MbedCE.

How to start

1. Create a new project according to MbedCE instructions
2. Add this as submodule to your project via git submodule add --depth 1 https://github.com/mbed-ce-libraries-examples/PCF8574IO PCF8574IO
3. The top level CMakeList.txt (in root of your project) should be modified according to this wiki page
4. Create your main.cpp file and copy & Paste example code below.
5. Build the project

Example code

#include "mbed.h"
#include "PCF8574IO.h"

I2C i2c(I2C_SDA,I2C_SCL);
PCF8574IO io(&i2c, 0x40);
 
int main() {
    printf("MbedCE_lib_example_PCF8574IO\r\n");
    while(1) {
        io.write(0xF); // all 8 GPIO set to 1
        thread_sleep_for(300);
        io.write(0x0); // all 8 GPIO set to 0
        thread_sleep_for(300);
    }
}

Description

This library is very simple, just write number 0-255 to change state of 8 GPIO pins.

• 0xf = 1111 1111
• 0x0 = 0000 0000
• 0x1 = 0000 0001
• and so on...

Status:

Library was not tested on real hardware but it was working with regular Mbed in the past.