Pushbutton

The pushbutton board (depicted: the SPI version)

This is the documentation page for the pushbutton boards.

Overview

This board adds 4 pushbuttons to your I2C or SPI enabled device.

Assembly instructions

None: the board comes fully assembled.

Pinout

For the SPI connector see: SPI_connector_pinout. For the I2C connector see: I2C_connector_pinout.

LEDs

The only LED is a power indicator.

Jumper settings

See solder jumpers on how to change the solder jumper.

By changing the solder jumper SJ1, you can make the connector SPI0 into an ICSP programming connector for the attiny44 on the board.

The software

Reading the pushbuttons is very much like the DIO module. The read and write ports are described below.

Write ports

Some ports just set a single value. So writing more than one byte to such a port is redundant. Other ports are logically a stream of bytes. So writing more than one byte is encouraged.

The pushbutton board defines just one port.

port	function
0xf0	change address.

Read ports

The pushbutton board supports several read ports:

port	function
0x01	identification string. (terminated with 0).
0x02	read eeprom (serial number).
0x10	read all buttons
0x20	read button 1 (1 means NOT pushed, 0 means pushed)
0x21	read button 2 (1 means NOT pushed, 0 means pushed)
0x22	read button 3 (1 means NOT pushed, 0 means pushed)
0x23	read button 4 (1 means NOT pushed, 0 means pushed)
0x30	reports which buttons have been pushed since last read of this register
0x40	read button 1 (1 means pushed, 0 means NOT pushed) (V1.1 and up)
0x41	read button 2 (1 means pushed, 0 means NOT pushed) (V1.1 and up)
0x42	read button 3 (1 means pushed, 0 means NOT pushed) (V1.1 and up)
0x43	read button 4 (1 means pushed, 0 means NOT pushed) (V1.1 and up)

Changelog

1.0

• Initial public release