Sx52(48) vga - 64 colors!!!

cbmeeks · 2006-09-10 19:03

Since Bean has done such a great job with NTSC and I felt like I should just wait to see what he comes up with the next couple of weeks, I thought I would dig up my old VGA code and get it going.

First thing I have to mention is that my SECOND camera is broke! argh...dang kids keep breaking my cameras.

Anyway, below is the source in ASM that will generate a nice color orange on a VGA monitor.

If anyone needs help wiring a VGA connector let me know and I can explain how I did it. When I get a new camera I am going to take some pictures so please be patient.

Also, when I get that camera I am going to do an official tutorial on my new site (shameless plug ahead) www.codershangout.com

Enjoy!

;=======================================================================
;TITLE:         sx52_vga_01
;
;PURPOSE:       SX52 based GPU
;
;AUTHOR:        cbmeeks
;
;CONNECTIONS:
;
;        TAPE = VSYNC
;        hsync = rc.1
;        vsync = rc.0
;
;DETAILS:
;
;
;              470
;    RB.0---\/\/--|
;              1.5k  +------------- RED  (0.0 - 0.7V)
;    RB.1---\/\/--|
;
;              470
;    RB.2---\/\/--|
;              1.5k  +------------- GREEN  (0.0 - 0.7V)
;    RB.3---\/\/--|
;
;              470
;    RB.4---\/\/--|
;              1.5k  +------------- BLUE  (0.0 - 0.7V)
;    RB.5---\/\/--|
;
;
;
;    RC.0------------------------ VSYNC (5v OK)
;    RC.1------------------------ HSYNC (5v OK)
;
;
;        RB is used for the image signal.
;        You have 8 bits to do what you want.
;        I recommend using 6 bits so that you get 2 bits
;        per color (RGB) giving you 64 colors.
;
;        Make sure RB doesn't go over 1 volt!  (0.7v is the spec)
;
;
;        If you have any questions, please ask!
;
;        cbmeeks
;        cbmeeks@gmail.com
;        http://www.codershangout.com
;
;=======================================================================


;-------------------------- DEVICE DIRECTIVES --------------------------
DEVICE    SX52,CARRYX
FREQ    80_000_000

DEVICE    OSCHS3                  ; High-speed external oscillator
DEVICE    IFBD                    ; Crystal feedback disabled
DEVICE    XTLBUFD                 ; Crystal drive disabled
IRC_CAL IRC_SLOW        ; Calibrate Internal Crystal to the slowest setting

RESET    Initialize


;===============================================================================================
;    REGISTERS
;===============================================================================================


;===============================================================================================
;    VARIABLES
;===============================================================================================
org $10
bank_0
d1        ds    1    ; general counter
d2        ds    1    ; general counter
d3        ds    1    ; general counter
d4        ds    1    ; general counter
Pixel        ds    1    ; current pixel
ScanLine    ds    1    ; current scanline
PixelCount    ds    1    ; number of pixels wide

hsync        equ    rc.1
vsync        equ    rc.0

WHITE        equ    %00111111
BLACK        equ    %00000000

;------------------------ INITIALIZATION ROUTINE -----------------------
org $02        ;allow 2 for the debugger        (PAGE 0)


;===============================================================================================
;    HORIZONTAL SCANLINE        31.77µS
;===============================================================================================
HScanline
;SYNC PULSE 3.77us 
    clrb hsync            ;(1)
    mov    w, #$4B
    mov    d1, w
hsync_0:
    decsz    d1
    jmp    hsync_0            ;(300)


;BACK PORCH 1.89us
    setb hsync            ;(1)
    mov rb, #%00000000        ;(2)
    mov    w, #$25
    mov    d1, w
backporch_0:
    decsz    d1
    jmp    backporch_0


;ACTIVE VIDEO 25.17us
    mov rb, #%00001011        ;(2) ORANGE HERE


    mov    w, #$1F
    mov    d1, w
    mov    w, #$02
    mov    d2, w
active_0:
    decsz    d1
    jmp    $+2
    decsz    d2
    jmp    active_0
    nop
    nop


;FRONT PORCH 0.94us
    mov rb, #%00000000        ;(2)
    mov    w, #$10
    mov    d1, w
frontporch_0:
    decsz    d1
    jmp    frontporch_0
    jmp    $+1


    ret



BlankLine
;SYNC PULSE 3.77us 
    clrb hsync            ;(1)
    mov    w, #$4B
    mov    d1, w
bhsync_0:
    decsz    d1
    jmp    bhsync_0            ;(300)


;BACK PORCH 1.89us
    setb hsync            ;(1)
    mov rb, #%00000000        ;(2)
    mov    w, #$25
    mov    d1, w
bbackporch_0:
    decsz    d1
    jmp    bbackporch_0


;ACTIVE VIDEO 25.17us
    mov rb, #%00000000        ;(2)
    mov    w, #$1F
    mov    d1, w
    mov    w, #$02
    mov    d2, w
bactive_0:
    decsz    d1
    jmp    $+2
    decsz    d2
    jmp    bactive_0
    nop
    nop


;FRONT PORCH 0.94us
    mov rb, #%00000000        ;(2)
    mov    w, #$10
    mov    d1, w
bfrontporch_0:
    decsz    d1
    jmp    bfrontporch_0
    jmp    $+1




    ret



;===============================================================================================
;    SETUP
;===============================================================================================
Initialize
    ;Configure port settings
    mov    rb, #%00000000        ;Port B output zero
    mov    !rb,#%00000000        ;Port B all output
    mov    rc, #%00000000        ;Port C output zero
    mov    !rc,#%00000000        ;Port C all output

    ;other setup



;===============================================================================================
;    MAIN LOOP
;===============================================================================================
Main

;SYNC LENGTH    0.06ms
    clrb vsync
    call BlankLine
    call BlankLine

;BACK PORCH    1.02ms
    setb vsync            ;(1)
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine



;ACTIVE VIDEO 480 lines (15.25ms)
    mov ScanLine, #240
LOOP1
    call HScanline
    call HScanline
    djnz ScanLine, LOOP1



;FRONT PORCH 0.35ms
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine
    call BlankLine




;===============================================================================================
;    JUMP BACK TO MAIN        -    Total lines:  
;===============================================================================================
    jmp    Main                ;goto main

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cbmeeks · 2006-09-12 12:36

Any takers? Anyone mess with VGA?

I guess it would help if I had a working camera.

I played with it some more this weekend and got 256x192 resolution but that was pushing it. 160x192 looks pretty good. I hope to get some SRAM working with it soon.

cbmeeks

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Bean · 2006-09-12 18:33

cbmeeks,
I hope you have better luck using the SRAM than I'm having...

I used SRAM on my data logger without any problems, but I guess with the video interrupt accessing the RAM at the same time the main code is accessing it is causing me all kinds of problems. I've been working on it for days now...

Right now, it goes goofy for the first 5 seconds then it works fine ??? If I reprogram the SX without turning off the power, it goes goofy again for 5 seconds... ARRRG.

Bean.

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Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com

There are only two guaranteed ways to become weathy.
Spend less than you make.
Make more than you spend.
·

cbmeeks · 2006-09-12 18:58

maybe you should clear the SRAM when you init/boot the SX? Should only take a few µS to clear 32k.

why are you having the main code and video interrrupt access the SRAM at the same time? Or is that something you are trying to fix. I would try to build the scanline (reading from SRAM) during the HBlank and only allow the main code to access the SRAM during VBlank

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cbmeeks · 2006-09-13 14:44

So how is the SRAM coming along Bean?

Good news! I just received my brand new $3.99 webcam in the mail yesterday from eBay! hahahaha

So I will be able to take some lo-res videos of my VGA circuit and post them tonight or tomorrow.

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Bean · 2006-09-13 14:55

I got the interrupt routine to co-operate by remembering the SRAM status and returning it when it's done.
So the main code can write to SRAM anytime (much faster).
But I still have the startup problem...

Bean.

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Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com

There are only two guaranteed ways to become weathy.
Spend less than you make.
Make more than you spend.
·

cbmeeks · 2006-09-14 13:43

When you say "goofy", what do you mean? Total screen garbage? Black screen? Noise?

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Bean · 2006-09-14 13:59

If I clear the screen to let's say green. Then most of the screen is green but there are some black "patterns" in it.
Then let's say I clear the screen to red, there will be less of the black. After about 5 or 6 clears the screen is fine (no black).

I'm beginning to think it's my PCB, I can't think of anything else. Because even if I·only access SRAM duing VBlank, I still get the problem.

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com

There are only two guaranteed ways to become weathy.
Spend less than you make.
Make more than you spend.

Post Edited (Bean (Hitt Consulting)) : 9/14/2006 2:22:09 PM GMT

cbmeeks · 2006-09-14 14:04

I got the same thing!!!! I will have to dig up those pictures when I get home tonight but I remember my SRAM/VGA circuit had the same problem. It was like black pixels where being thrown in all over the place.

I chalked it up to me not clearing the SRAM correctly and it was displaying garbage.

I will see if I can find those pics

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http://www.codershangout.com

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Sx52(48) vga - 64 colors!!!

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