Am Samstag, den 28.01.2017, 10:46 +0000 schrieb Tristan Williams: > I have successfully written a couple of forth words keypad? and > keypad > that use i2c (PCF8574A) and an interrupt to tell me if/what key has > been pressed on my keypad. This is currently completely independent > of > the keyboard buffer. What I would like to do is to take the value > that > would placed on the data stack by keypad and instead insert it into > the > keyboard buffer.
The trunk revision has a word called >rx-buf that appends a character from the data stack to the command input buffer. It is used in the usart interrupt word as follows : isr-rx usart-data-port c@ dup 3 = if cold then >rxbuf ; (the code 3 = is the check for ctrl-C that resets the system). IIRC Erich uses this word to communicate via an RS485 network. > I hope then to take advantage of a recogniser to view (say) 350*700 > as > an xy coordinate and finally free my cnc (assisted) xy table from its > umbilical connection to my computer. I am sure it can be done without > this, but to do so seems like going in the wrong direction. > > The internals of the keyboard buffer and recognisers are new areas > for > me so I would grateful for any hints as to where to start. The >rx-buf is new, as described above. The recognizer stuff is currently in a discussion with the Forth language gurus, and got 4 revisions so far (the 4th beeing worked on currently). A good starting point (because I made it ;) ) is http://amforth.sourceforge.net/Recognizers.html Despite it's name the RFD text itself is (should be) readable for starters too. It has a lot of discussion topics and examples after the formal standard section, just scroll down a few pages. A lot of (working) examples are at http://theforth.net/tag/recognizer Matthias ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
