Datasheet

ManualsBrandsDigilent ManualsDevelopment Boards & KitsPmod JSTK2, Module SPI

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodJSTK2™ Reference Manual

Revised July 19, 2016

This manual applies to the PmodJSTK2 rev. C

DOC#: 502-330

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 9

Overview

The Digilent PmodJSTK2 (Revision C) is a versatile user input device that can be easily incorporated into a wide

variety of projects. With a two-axis joystick on a center button, a trigger button, and a programmable

RGB LED capable of 24-bit color.

1 Functional Descriptions

The PmodJSTK2 utilizes two potentiometers oriented orthogonally to one another and are manipulated by moving

the joystick in the X and Y directions. As the joystick moves, the voltage output at the sweep pin of each

potentiometer changes and is measured by the 10-bit ADC present on the embedded PIC16F1618 microcontroller.

The raw measured data is stored at a rate of 100 Hz as a 16-bit right-justified variable in RAM with the upper 6 bits

masked with zeros.

Additionally, each successive measurement also produces two 8-bit values representative of the joysticks physical

location with respect to each axis. Note that if inversion of either of the 8-bit position axis are set, the values will

not change until the data has been re-collected by the PIC16 at the 100 Hz rate.

The PmodJSTK2.

 Factory Calibrated Two Axis Resistive

Joystick

 Center Joystick Button

 Trigger Style Push Button

 24-bit RGB LED

 6-pin Pmod connector with SPI interface

 Library and example code available in

resource center

Features include:

Summary of content (9 pages)

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodJSTK2™ Reference Manual Revised July 19, 2016 This manual applies to the PmodJSTK2 rev. C Overview The Digilent PmodJSTK2 (Revision C) is a versatile user input device that can be easily incorporated into a wide variety of projects. With a two-axis joystick on a center button, a trigger button, and a programmable RGB LED capable of 24-bit color.
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PmodJSTK2™ Reference Manual 2 Specifications Parameter Min Typical1 Max Recommended Operating Voltage 3.1 3.3 3.5 Maximum Supply Voltage 5.5 Power Supply Current2 4.85 3 Power Supply Current 17.6 Parameter Value Maximum Joystick Angle 25 Communication Protocol SPI Note¹: Data in the Typical Column uses VCC at 3.
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PmodJSTK2™ Reference Manual 3.1 SPI Timing Requirements The embedded PIC16F1618 requires certain SPI timing requirements in order for successful communication to occur. When the Chip Select line is brought low, users must wait at least 15 μS before sending the first byte of data. An interbyte delay of at least 10 μS is required when transferring multiple bytes.
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PmodJSTK2™ Reference Manual 3.3 Using the High-endurance Flash The PmodJSTK2 has a set of factory loaded calibration values that are used to calculate the 8-bit position values for each axis. Users may enter calibration mode to recalculate all of those values by rotating the joystick around so the embedded PIC16 can record all of the maximum and minimum samples for the two axes. The on-board blue LED will be flashing to indicate that the calibration sequence is taking place.
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PmodJSTK2™ Reference Manual 3.4 Command Summary 3.4.1 Get Commands Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
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PmodJSTK2™ Reference Manual 4 Pinout Description Table A pinout table of the PmodJSTK2 is provided below. Pin 1 2 3 4 5 6 Signal CS MOSI MISO SCK GND VCC Description Chip Select Master-Out-Slave-In Master-In-Slave-Out Serial Clock Power Supply Ground Power Supply (3.