Keyboard to serial ASCII converter

Chet

To avoid re-inventing the wheel, I thought I would ask:

Has anyone written code to translate a PC keyboard data stream to ascii?·(KB -> serail ASCII)·I would like to have that option available instead of doing via my computer.

I have done searches without success.

Thanks

Chet

T&E Engineer

Take a look at these 2 posts:

Micro Datapad entry: http://forums.parallax.com/showthread.php?p=736766

PS/2 Keyboard entry: http://forums.parallax.com/showthread.php?p=737546


I have also used the PC with Hyperterminal and the SX chips.

Chet

Thanks a lot. I did not get any of these references on the search. I just wanted to get away from using hyper terminal and a level shifter for symple stuff. This should take care of it.

Thanks again

Chet

Chet

Forgive me for what I am about to ask....

I tried using the "keyboartest_with _ascii_output.src but could not figure out how to bypass writing to the LCD in parallel mode.· What change in the code is required to get the ascii output to go to a serial output so I can send it straight to the 4x20 parallax LCD?· I cannot figure out how to get the ascii code and use it in sxbasic to do a serial send to the LCD.



I have uploaded the file in question for reference.

Any help is highly appreciated

Chet·

PJMonty

Chet,

Is the problem that you can't figure out how to bypass writing to the LCD, or is the problem that you want to make the changes to an assembly language program using SX/B?

Thanks,
PeterM

Chet

I am trying to split out the key board routines and then hand over the ascii caracter to a SX/B program, such as serieal out "ascii caracter. Ultimately if I can get an SX28 to convert the keyboard scan results to ascii and send serial ascii out to an external device. Even if the code is such that the SX initializes the key board, gets key pressed, convert it to ascii and then sends the ascii in serial format via one of the SX28 pins. It can be a dedicated SX. Part of the objective is to have an economical serial ascii keyboard. I am working on some mobile projects and using the laptop each time for input is a pain.

Thanks for your time.


Regards


Chet

JonnyMac

I wrote a P2/2 keyboard reader in SX/B (okay, there's some assembly mixed in, but the core program is SX/B) that should be much easier to adapt for your use. The file is posted in this thread:

http://forums.parallax.com/showthread.php?p=737546

Chet

JonnyMac, I posterd my reply on the orriginal post (not paying attention...) Thanks for your help

Regards

Chet

Chet

JonnyMac said...
I wrote a P2/2 keyboard reader in SX/B (okay, there's some assembly mixed in, but the core program is SX/B) that should be much easier to adapt for your use. The file is posted in this thread:

http://forums.parallax.com/showthread.php?p=737546

I tried taking out the LCD related code, but do not know how to "handoff" the key code to SX/B.· With the "watch", I can see that the scan is working as advertised, but the handoff is not.

Modified keyboardtest_with_ascii_output as follows:



device sx28,osc4mhz,turbo,stackx,optionx
freq·4_000_000
irc_cal·irc_slow
LCD_PIN··PIN· ·RA.2 output
KEY_ASC··VAR·BYTE
LCD_OUT··SUB·1
program start
start:
goto jump_in
SUB LCD_OUT
key_asc = __param1
watch __param1, 8, uhex
watch key_asc, 8, uhex
break
serout LCD_PIN, n19200, key_asc
return
JUMP_IN:
ASM
key equ $0C
temp equ $0D
temp2 equ $0E
stat equ $0F

main2
mode $0f
mov stat,#0
call keyreset··'reset the keyboard
main
call scankey··'Gets one key
call NCS··'Sets Num, Caps, or Scroll lock in var stat
cja key,#$90,main
mov w,key
jmp @go2it
back2it
mov key,w
cje key,#0,main··'jump to main if key is 0
watch key, 8, uhex
call LCD_OUT··'Prints to LCD
jmp main

Remaining code for non-lcd remains the same.

Can I impose one more time...?

Thanks

Chet

JonnyMac

I don't get it: you've got a working routine that's already to hand-off the byte to SX/B (I'm referring to my keyboard program that encapsulates the asm code in an SX/B function_). Are you wanting someone to write the whole program for you? That would be easy enough if you'd just define to end goal.

Capt. Quirk

Why did you modify the code·Peter posted, if you didn't need the lcd?

Chet

I got it to work. Too many late nights contributed to many mess-ups. I am going through the different versions trying to understand the asm code a bit.

Thanks for you patience

Chet