10 Nov
2014
10 Nov
'14
2:41 p.m.
On Nov 10, 2014, at 4:11 PM, Jules Richardson
<jules.richardson99 at gmail.com> wrote:
No, the keyboard will always generate a CR (CTRL-M, 0x0d) when the return/enter/whatever
key is pressed. Unix/Linux line discipline translates it into an LF (if, IIRC, ICRNL is
set).
The semantics for stty change from Unix to Unix, but a CR is always decimal 13, a line
feed is always decimal 10. Check "man ascii".
On 11/10/2014 02:51 PM, Roe Peterson wrote:
You know, this entire discussion requires a user to reliably hit the
RETURN key. At least once, at the right time, and after connecting with
a modem, or whatever.
Except that the return key generates 0x0a [LF] (at least on the Linux system that I have
the board hooked up to) and the board is expecting 0x0d [CR, ctrl-M] as the first
character.
I did end up writing a quick bit of C code to set up the serial line parameters and spit
out exactly the data that I wanted, just so I could rule out other possibilities getting
in the way, but still no luck. As I said in another message, I'm not particularly
surprised, though - the board is over 30 years old, it was sitting in a junk pile, and
some of the parts could easily be bad (2114 RAM chips aren't known for their
reliability, for instance).
cheers
Jules