In SX Microcontrollers, SX/B Compiler and SX-Key Tool, toru173 wrote:

Thankyou for those links, Peter. The second was what motivated me to join this forum and post this problem, but your smallc interpreter is very interesting. In that discussion you made the following comment:

Other problem, the switch statement reads the address to jmp to
using iread. It looks the only way to do this jump is the use of a
secret instruction and reti

This is similar to the method I had imagined, I think. Could you please show me what you were refering to?

As to why I might need so many opcodes; I had intended to implement a subset of the JVM on the SX. I'm a big fan of the Lego RCX robotics and there has been a port of the JVM to the H8 at the centre of the robot (LeJOS - I think it stands for "Lego Java Operating System", but I believe it also means "far" in spanish) and the code availible is quite easy to understand. Even if I'm not able to squeeze the entire JVM into the memory availible (I am aiming for the stack manipulation operations and the JVM equivilent of the SX native instructions, at least), I would still have a very rich and well-documented language to program with.

What you suggested in your previous post (starting "You can have a simple test at the start:") is what I had thought necessary. I would like to avoid this method though because it limits the amount of code movement availible to me. At the very least, thankyou for verifying that method for me ^_^

I'd also like to thank you for your quick and knowledgable responses. You're helping me to learn more about this chip then the datasheet could have told me - for example, it took me a while to work out the meaning of the @ symbol in front of some of the addresses in your code, but now that I know of it I'm sure I will use it often. Thankyou!

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=125768#m125790

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)