M68HC11
Until now all my work has been focused on the 8-bit M68HC11 and on the 32-bit 683xx microcontrollers produced by Motorola. Software development is done under Linux and sometimes MS-DOS. I'm using a variety of assemblers: Dasm by Matt Dillon (small and fast) or the as6811 by Alan Baldwin (rich macro assembler) for the 68hc11. Stephane Carrez's gcc-patch (for gcc-2.95.3 or gcc-3.0) is a very reliable and perfectly satisfying way to write code for the 68hc11 in the C programming language. Of course you can use the assembler of gcc, too, and have access to the complete toolchain of the gnu compiler collection: debugger gdb, newlib, etc...
The 68hc11 can be programmed in the
Java programming language designed by Sun Microsystems! Have a look at RTJ
Computing's SimpleRealTimeJava. It's worth it! You may want to
download a short reader concerned with the usage of Java on the 68hc11
(beware: written in German): J68HC11.pdf ! Also ready for free
download you get startup
code for simpleRTJ that has been tailored to be used with the
gcc-patch mentioned above. Just unpack besides the examples you can
download from Stephane's homepage (gnu-m68hc11.org). You need some header
files from his sample codes. The tarball also contains some examples from
me, some of which might be interesting to you: Among other things a simple
LCD-SPI interface utilizing a 595 shift register, in order to connect an
LC-display (with HD44780 controller) to a microprocessor with very few
wires. Everything has been tested thoroughly. Should you encounter any
problems: Please let me know. I'm thankful for your response. Or maybe you'll just like to
discuss something...
Moreover: a tiny EAGLE-library with among other components:
- MAX756 DC-DC converter
- M68HC11F1 microcontroller by Motorola (PLCC68 package)
- LCD with HD44780 controller (2x16 characters)
- TFDS4500 and TOIM3232 IrDA-interface from Vishay
- JStamp from Systronix with aJile's aJ-80
Farad for your bike - Farad für's Fahrrad (Standlicht)
And that's not all: Ever felt unsafe on your bike when waiting at a red stoplight in the dark? This could be over now! The permanent rear light for you bike-circuit gives you >1 minute energy to power an LED (or even several of them - not tested, yet). It can be built so small that it's possible to easily install it in the casing of your old rear light. The circuit exploits the very high capacity (1F) of a Golcap capacitor to supply a current source (consisting of the two pnp-transistors) with considerable amount of current (about 10mA) for a certain time before the intensity fades away. The Goldcap is reloaded by the generator of your bike during normal ride. The connecting polarity is not important as the bike's generator produces an AC voltage and the Zener diode protects the rest of the circuit when needed. The circuit has been in service for quite a while on my bike and I'm very happy with it. Building it yourself (takes ~1 hour) even saves you some money compared to buying a ready-to-use light from a shop.
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modified: Tue Oct 23 21:45:18 CET 2001