Difference between revisions of "Pushbutton"
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Reading the pushbuttons is very much like the DIO module. The read and write ports are described below. |
Reading the pushbuttons is very much like the DIO module. The read and write ports are described below. |
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=== Write ports === |
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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. |
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. |
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=== Read ports === |
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The pushbutton board supports several read ports: |
The pushbutton board supports several read ports: |
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Latest revision as of 11:59, 11 November 2015
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.
Possible Configurations
External resources
Datasheets
Additional software
Related projects
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.
Programming
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) |
Default operation
Future hardware enhancements
Future software enhancements
Changelog
1.0
- Initial public release