Difference between revisions of "Forth"
Line 14: | Line 14: | ||
== Adding new words == | == Adding new words == | ||
It is easy to add your own words, just add a "define GERTBOARD" to atlast.c around line 64. In my case I will add some words for controlling my Gertboard. I will leave it as a skeleton until I've done the implementation myself. | It is easy to add your own words, just add a "define GERTBOARD" to atlast.c around line 64. In my case I will add some words for controlling my Gertboard. I will leave it as a skeleton until I've done the implementation myself. | ||
+ | If you can't wait there is a detailed description on howto do this in the atlast-forth manual. | ||
<code><pre> | <code><pre> | ||
#define STRING /* String functions */ | #define STRING /* String functions */ |
Revision as of 06:09, 6 July 2013
Forth on RPi
sudo apt-get install wget
wget http://www.fourmilab.ch/atlast/download/1.2/atlast-1.2.tar.gz
tar -xzvf atlast-1.2.tar.gz
cd atlast-1.2/
make
Start the Forth interpreter with ./atlast and exit with Ctrl-D
atlast.html and atlast.pdf is included and an is an extensive atlast-forth manual. Read it online [1]
Adding new words
It is easy to add your own words, just add a "define GERTBOARD" to atlast.c around line 64. In my case I will add some words for controlling my Gertboard. I will leave it as a skeleton until I've done the implementation myself. If you can't wait there is a detailed description on howto do this in the atlast-forth manual.
#define STRING /* String functions */
#define SYSTEM /* System command function */
#define GERTBOARD /* Gertboard command function */
Then add your own word definitions at the end of the section with word definitions, around line 2700 in atlast.c
#ifdef GERTBOARD
prim P_gert_setport() // channel state ---
{ // Set a digital io port to a specified state
Sl(2); // Make sure there is at least two params on the stack
// Your code goes here
}
prim P_gert_getport() // channel ---
{ // Get the state of a digital port
Sl(1); // Make sure there is at least one param on the stack
// Your code goes here
}
#endif /* GERTBOARD */
And finally, add the actual words to the list of defined words right after #endif /* EVALUATE */ at line 3050 or so.
#ifdef EVALUATE
{"0EVALUATE", P_evaluate},
#endif /* EVALUATE */
#ifdef GERTBOARD
{"0SETIO", P_gert_setport},
{"0GETIO", P_gert_getport},
#endif /* GERTBOARD */
Now, save and run "make" again to recompile atlast.c.