DOSonChip Problem

Areal Person

Hi,

I'm trying to get my DOSonChip working.
I'm using the info in this thread, but I'm having no luck.
http://forums.parallax.com/showthread.php?p=616115

I'm trying to use the VGA_Text object

This code fragment is using the TV, there is· outa[noparse][[/noparse]16] := 1 &· outa[noparse][[/noparse]17] := 1
How would I convert this to VGA ? I know I've got to use ... term.start(16) but... is that all ?
The screen goes blank like this
************
· dira[noparse][[/noparse]5] := 1
· outa[noparse][[/noparse]5] := 1
· dira[noparse][[/noparse]16..23] := $FF····················
· 'start the tv terminal
· term.start(16)
· term.str(string("Press Enter twice to begin.",13))
· 'start the keyboard
· kb.start(26, 27)
· ' start the serial cog
· doc.start(7, 6, %00, 9600)
·
· repeat
··· c := doc.rxcheck
··· if c <> -1
····· term.out(c)
····· outa[noparse][[/noparse]16] := 1
··· c := kb.key
··· if c <> 0 and c <> $DF
····· doc.tx(c)
····· outa[noparse][[/noparse]17] := 1

*************

Thanks for the help,
-Areal




▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I have a tree growing out of my head, but

what do you expect ? I'm a programmer.

Mike Green

Do not use pins 16-23 in your program. It interferes with the use of the VGA display by term.

Along those lines, what are you trying to do with the out[noparse][[/noparse] 17 ] := 1 and the outa[noparse][[/noparse] 16 ] := 1?

Areal Person

I'm just trying to convert that code to use VGA, it's susposed to get the directory listing from the SD card
and dump it to the screen.

Thats all.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I have a tree growing out of my head, but

what do you expect ? I'm a programmer.

Mike Green

By using VGA_text (as term) and calling term.start(16), you're initializing a display module that outputs to VGA using pins 16-23. It should work pretty much the same as the TV version from that point onwards. I don't have a copy handy, but look at the demo program program for VGA_text.

Take out the out[noparse][[/noparse] 16 ] and out[noparse][[/noparse] 17 ] as well as the dira[noparse][[/noparse] 16..23 ] and see what happens.

Areal Person

I did as you said, I can't get it to do anything with the DOSonChip, the VGA is working
ok.

It's the DOSonChip that I can't get to do anything.

[noparse]:([/noparse]

Here's my code now. I wired the DOSonChip like this

- UART_TX (pin 3) to P7
- UART_RX (pin 4) to P6
- RESET# (pin 5) to P5
- CTS (pin 13) to VSS
- DoC's VCC to Demo Board's VDD
- DoC's VSS to Demo Board's VSS

***********

OBJ
······· vga··· : "vga_text"
······· kb····· : "keyboard"
······· doc···· : "FullDuplexSerial"


PUB start | i, c
· dira[noparse][[/noparse]5] := 1
· outa[noparse][[/noparse]5] := 1
················
· 'start the vga
· vga.start(16)
· vga.str(string("Press Enter twice to begin.",13))

·'start the keyboard
· kb.start(26, 27)
· ' start the serial cog
· doc.start(7, 6, %00, 9600)

· repeat
··· c := doc.rxcheck
·· if c <> -1
···· vga.out(c)
··· c := kb.key
··· if c <> 0 and c <> $DF
····· doc.tx(c)·


***********

Has anyone got this to work ??

I can figure anything out if I have the simple first step working
but I don't have the experience to get it going, because I a newbe.

Thanks,
-Areal

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I have a tree growing out of my head, but

what do you expect ? I'm a programmer.

Post Edited (Areal Person) : 11/9/2007 1:28:41 AM GMT

Oldbitcollector (Jeff)

Areal,

While this doesn't help with your problem, I'm simply curious why you chose to use DOSonaCHIP instead
of simply using the Prop directly with the SD routines (ie: PropDOS) With the exception of being able
to make directories, the prop seems to do everything that does.

Not trying to flame, just curious if this is something I should add to my goodies. [noparse]:)[/noparse]

Oldbitcollector

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Buttons . . . check. Dials . . . check. Switches . . . check. Little colored lights . . . check.

— Calvin, of 'Calvin and Hobbes.

Areal Person

@Oldbitcollector

You may be very correct. I think I should maybe try that. I have previously bought this
because I hoped it would be simple.

I need simple things to start with, so I can learn, as much is always new to me.

I'm doing well learning, it's just that I seem to always be learning everything all the time...

Thank you, I'll try that as soon as I can.

I think this DOSonChip may not be good, but I really don't know anything about it.
so I really can't say if its good or not.

Thanks,
-Areal

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I have a tree growing out of my head, but

what do you expect ? I'm a programmer.

Mike Green

Areal Person,
I notice that you're not really resetting the DOSonChip. Make sure you do an OUTA[noparse][[/noparse] 5 ] := 0, then pause for a few milliseconds like with WAITCNT(CLKFREQ/500+CNT), then do an OUTA[noparse][[/noparse] 5 ] := 1.

Another thing is to check the signals from the DOSonChip. Sometimes they label a pin as TX when it's actually meant to be the transmit line from the microprocessor and, similarly, they label a pin as RX when it's actually meant to be the receive line from the microprocessor. I don't have any DOSonChip documentation handy to look at.

I did look at the thread you mentioned and your setup seems to be correct.· Try the reset pulse.


Post Edited (Mike Green) : 11/9/2007 2:09:44 AM GMT

Areal Person

Thanks Mike, I tried with no luck.

I'll continue to work on it. I followed the directions in the thread, but I don't know whats wrong
I can't get it to do anything with the DOSonChip.

Thank you for your help.
-Areal

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I have a tree growing out of my head, but

what do you expect ? I'm a programmer.