Stair-Stepping¶
Does your terminal output look like this ?
ok.
ok.
ok.
ok.
reset Mecrisp-Stellaris RA 2.4.6 with M0 core for STM32F051 by Matthias Koch
ok.
ok.
ok.
ok.
ok.
ok.
ok.
If it does, then you’re sufferring from ‘stair stepping”.
This happens when a Serial Terminal refuses to return the “Carriage” (Cursor) after a “New Line” NL (also known as a Line Feed LF) is received. In the ‘picture’ above (taken from my system) all that’s happening after I hit the Carriage Return key, is a New Line.
A special plea to the author, Matthias please add a cr to your release by default ?
The Solution ?¶
Fortunately because Mecrisp-Stellaris is Open Source, there are numerous solutions to this issue. Look at it as a exercise for the new Forth user ?
Use a Terminal that is configurable for it¶
Picocom is given as a example, but other serial terminals have options regardingf CR/LF also. Some like E4thcom (linux only) deal with this by design and is FAR BETTER for a quick fix, highly recommended if you run Linux.
Picocom¶
Picocom has a command line syntax that solves the problem. It runs under all Unixes and Mac etc.
picocom -b 115200 /dev/cuaU0 --imap lfcrlf,crcrlf --omap delbs,crlf --send-cmd "ascii-xfr -s -l200"
E4thcom¶
E4thcom fixes this issue for Mecrisp-Stellaris but only under Linux.
Add this code to your program in the INIT Word¶
This “hook” tells Mecrisp Stellaris to add a CR to the LF’s.
: emit-crlf ( c -- ) dup 10 = if 13 serial-emit then serial-emit ;
' emit-crlf hook-emit !
Mecrisp-Stellaris RA 2.4.6 with M0 core for STM32F051 by Matthias Koch
ok.
ok.
ok.
: emit-crlf ( c -- ) dup 10 = if 13 serial-emit then serial-emit ; ok.
ok.
ok.
' emit-crlf hook-emit ! ok.
ok.
ok.
ok.
Modify your Mecrisp-Stellaris Kernel¶
Change a few commands in the Mecrisp-Stellaris source file “datastackandmacros.s”
Change occurances of:
"\Meldung\n"
to
"\Meldung\r\n"
And rebuild the distribution by running “release” in the root directory.
