Programming Examples

The Following Information is Not In Any Particular Order

(and does not come with any guarantees!)

Valsalva Test Device (VTD)

3rd place winner in National uMedic contest

Vinculum II (VNC2) for adding USB to Propeller

Adafruit.com 16x32 RGB LED Matrix Control big LED arrays with a Prop!

YModem: Send files to your computer from the Prop over serial link

Chess: Human Vs. Propeller

Show Windows Bitmaps on TV

Code and screenshots provided in this forum thread.

Video Player for TV

Plays custom format video files with sound from SD card onto TV

Code and description in this forum thread

Unipolar Stepper Motors

I used this code to test a unipolar stepper motor (I think I got the motor from Parallax).

Code provides full, half, or micro-stepping.

You need something like a ULN2803 darlington array to buffer and protect the Prop.

There a schematic of someone else's setup here.

Basic Wavetable MIDI Player

PropEKG

RTC (Real-Time Clock) Services

From DS1307: The DS1307 is an I2C RTC. This means you can connect it to the I2C bus on pins 28&29 easily. It takes a 5V supply, but the I2C pins can directly connect to the I2C bus.

Using just the Prop

Dual ADC Object and Demo

DAC (digital-to-analog conversion) --> WAV Music Player !!

I/O Expansion Using I2C Bus

2-Bit Bitmap App

Creates 4-color bitmaps for the Prop. TV and VGA demo code also here.

6-Bit Bitmap App

Creates 64-color bitmaps for Prop for VGA display.

1-Bit Bitmap App

Creates 2-color bitmaps for Prop for VGA display.

Assembly Tutorial (by Forum username "deSilva")

This is nice since Parallax failed to provide very much in the way of instructions, other than examples.

It can be found in the Forum on this thread.

Or, download the local copy here.

There are also "Assembly Code Examples for the Beginner" in this forum thread.

SD Card Interfacing

Cameras

TV Colors

Info on colors generated by the NTSC/PAL TV driver.

VGA Colors Applet

Particularly useful for deciphering the 1024x768 VGA tile driver demo.

Decompose/Examine a Propeller hex palette value

Generate a hex palette value from RGB color picker

Interleaved Character Generating Windows App

Makes interleaved, 2-color characters just like what's in the Propeller's ROM

4-Color Character Generating Applet

Generate custom 16x16, 4-color characters

Basic Window/Form System

Notes

Notes on "Graphics_Demo.spin"

Use "=>" for "greater than or equal to" test. ">=" is an assignment operator in SPIN !!!!!!!!!!!!!!

All addresses are WORDs

Sparkfun's Nokia LCD

MP3 (work in progress [May need to wait for Prop II])

Wireless (work in progress)

PrintScreen for VGA

This code turns the VGA screen into a 24-bit Windows Bitmap file on an SD card (assuming you have an SD card connected to the Propeller).

Sample:

JuiceBox Display

Delay Generator Demo

Demonstrates control of two Delay Generator objects with XGA (VGA 1024x768) user interface.

Screenshots:

Download here.

100 MHz clock

I believe it's possible to control timing at the clock level using 4 cogs (because instructions take 4 clocks each). Cogs can be synced using the CNT.

But, 12.5-ns clock is rather inconvenient! It would be nice to have even 10-ns increments in the timing.

I've done this by replacing the onboard 5 MHz crystal with a 6.25 MHz crystal. Since the crystal simply plugs into both the proto and demo boards, this is very easy to do physically.

6.25 MHz is non-standard, but I did find some from alltronics.

I used the counter modulator to toggle PIN#7 at clock frequency and measured result with o'scope:

80-MHz clock:

100-MHz clock:

Video BlackJack Game

Download current version here. Forum member "Clemens" has created a modified button bar.

Playing Card Game Framework for TV and XGA

This is a basic framework for playing card games. I've minimized the size of the resources, so there's plenty of room for code for the actual game.

This demo just displays random cards on TV.

A basic psuedo-random number generator is included. Also, the code for a variable # of deck shoe is there.

Download TV version here.

Download VGA 1024x768 (XGA) version here.

I really like the 1024x768 (XGA) tile driver (see 3rd Party or Forum Stuff). But, wanted to be able to easily resize and move the graphics window around. So, here are the modifications that do this:

CON

....

gxt=32 '# graphics tiles in x direction (was 16) 
gyt=4 '# graphics tiles in y direction (was 8)

w_x = 15'40 'left tile# of graphics window
w_y = 3'30 'top tile# of graphics windows
w_left = w_x * 16
w_right = w_left + gxt*16 '256
w_top = (48 - w_y) * 16
w_bottom = w_top - gyt*16'128

PUB start | i, j, k

...

'start and setup graphics
gr.start
gr.setup(gxt, gyt, gxt*8, gyt*8, bitmap_base)'(16, 8, 16*8, 8*8, bitmap_base)

...

'make some graphics tiles on the screen
repeat i from 0 to (gyt-1) '7
repeat j from 0 to (gxt-1) '15
array.word[cols * (w_y + i) + j + w_x] := display_base + i*64 + j*gyt*64 + 21 'RJA

PropMonitor (debugging tool)

Visual Spin