Joystick Interface

Parts

Part numbers listed are those of the Digi Key Corporation parts database. Note - some generic parts do not have part numbers listed.

Processor

• ATTINY26-16SI-ND - U3 - Atmel AVR Microcontroller
• LED2 - Green LED for use by programs running on the microcontroller
• R3 - 470 ohm resistor in series with LED2
• R4 - 470 ohm pullup resistor for joystick DATA
• R5 - 470 ohm pullup resistor for joystick ACK

CAN Specific

• MCP2515 - U2 - Microchip CAN Controller with SPI Interface
• MCP2551 - U1 - Microchip CAN TransponderP966-ND
• R1 - 10k ohm pullup resistor for the RESET command
• R6 - 10k ohm pullup resistor for the CAN chip select

Onboard Power Control

• 296-12290-1-ND - U4 - 5V Linear Regulator
• 1N4004GICT-ND - D1 - Diode
• P966-ND - C1,C2 - 10 microfarad Capacitor
• 399-2127-ND - C3,C4,C5 - 0.1 microfarad Capacitor
• LED1 - Red LED to indicate power activity
• R2 - 470 ohm resistor in series with LED1

Oscillator

• 300-7022-1-ND - U4 - 11.0592 MHZ Clock Siqnal Oscillator

Headers

• A19423-ND - J1 - Power 2-pin header
• A19430-ND - J2 - CAN 3-pin header
• A19436-ND - J3 - 9 pin header to joystick
• A19520-ND - J4 - SPI connection to the MCU, 10 pin header

Misc.

• 377-1090-ND - Box to contain the module
• 1892K-ND - Standoffs

Electrical

Port Pin Assignments on MCU

* Port A:
* Bit	Dir	Description
* 0	I	Pad DATA
* 1	O	Pad COMMAND
* 2	O	Pad ATT
* 3	O	Pad CLOCK
* 4	I	Pad ACK
* 5		Unused
* 6		Unused
* 7	O	Status LED

* Port B:
* Bit	Dir	Description
* 0	I	SPI data input, with pull-up
* 1	O	SPI data output
* 2	O	SPI clock
* 3	O	CAN /CS
* 4	I	Clock, not usable as I/O
* 5		Unused
* 6	I	CAN INT
* 7	I	/RESET, not usable as I/O
	

Code

C Source Files

• can.c - communicates with the CAN controller, pretty much the same for all modules

• joystick.c - code that controls the joystick's inputs

• Makefile - programmer created file for configuring the compilation for gcc

• psx.c - code that interfaces with the psx controller

• spi_usi - hardware based spi