arduino-ioexpander-fw

IO Expander Device Arduino Firmware with UART

Overview

Requirement

• Arduino Nano or Arduino Pro Mini
• Arduino IDE (Version: 1.8.5)

Usage

• Use host sample application
  • arduino-ioexpander-lib(Arduino)
  • android-ioexpander-host-sample(Android)

Description

Pin connections

Arduino Host Dev	IO expander Device	Note
TX	RX
RX	TX
GND	GND

Sequences

• Func No. is 7bit
• W = 0b0, R = 0b1
• 'Size' is 8bit
• STX : 0x20, ETX : 0x30, ACK : 0x06, NACK : 0x15

Function Maps

• Reading I2C Data: Write sequence(Write Slave Address, Read Length) -> Read Sequence
• IO_DIR : OUT = 0b1, IN = 0b0

Port Assignment

• Supports interrupts on Digital0 only.