A little HELP!!

[MikeGTN]

Hi Ed,

Seems like you are making some progress on this project. I was tempted to purchase some chips from the supplier, but now think will wait a while longer to see how your results conclude. I was a little concerned given how long these devices have been EOL about them being actually genuine. So will be an interesting story to hear how you finally progress & about any discoveries you make along the way.

Certainly aerostar has proven the code for usage on the NTSC video standard with real life testing of his original prototype boards.

Mike.

[aerostar]

The chips as far as I know were never cloned, so I would say UTsource are genuine. It is a specialised IC and were used by cctv companies and video equipment manufacturers. In the UK they are still being used in the Amateur radio fraternity. It is a long time since EOL, but they are still very useful.

If you go here http://dunstabledownsradioclub.org and choose TV Streams, GB3TZ in beacon mode (when not being used) the display is done using the STV chip, controlled by a Pic micro - (done in assembler, not by me) , the Pic also controls the repeater logic.

My involvement in these chips - way back in 2003ish was to insert time overlay in cctv systems which did not have their own OSD, and using MSF or GPS to provide accurate time.

[Ramius]

Hi All!
When I purchased the chips the fact that they were offering large quantities at a discount suggested they were still being manufactured. Okay back to the code stuff. In the beginning of the code there are "con" statements and yet there does not seem to be any reference to these statements. Why are these statements part of the code? "NTSC." appears on the screen with or without a video reference. I wish to get to the point where I can place text such as STBRPM (Starboard RPM) and PORTRPM (Port RPM with a variable of 4 digits following the text while there is a video input signal from a camera. How can this be done? Maybe I could start with something simple such as moving the "NTSC." from the right side of the screen to the left? Again my greatest thanks!

Ed

[aerostar]

Some "Con" statements left over from debug etc code that was stripped out as I said somewhere earlier, and were also used as memory jogger.

NTSC. will appear as this program always sends on screen refresh regardless of whether there is video input or not, it is down to you what you wish to be displayed with or without incoming video, it was for video repeater ident.


This is the part you need to understand about placing text on screen

HEADER:
LINECOUNTER=2 'SET START POSITION ********* line 3 from top (0-2 = 3!)
CHARCOUNTER=23 'SET CURSOR POSITION***********Character position start 23rd from left
GOSUB SETLINE
FOR CHARS2=0 TO 4
READ CHARS2, ASCCHAR
gosub GETSTVCHAR 'CONVERT ASCII TO STV
GOSUB DISPLAYCHAR
NEXT
RETURN

NOVIDEO:
LINECOUNTER=5 'SET START POSITION
CHARCOUNTER=4 'SET CURSOR POSITION
GOSUB SETLINE
FOR CHARS2=6 TO 23 ' FROM EEPROM DATA
READ CHARS2, ASCCHAR
gosub GETSTVCHAR 'CONVERT ASCII TO STV
GOSUB DISPLAYCHAR
NEXT
RETURN

with regards to getting your RPMs on screen the DIG command would probably help,

so if you had a reading of 2400 as rpm in a word byte RPM, I THINK (following is UNTESTED)

ASCCHAR = RPM DIG 1
This gives a value of 2, and as it happens the character matrix in the chip will display 2 as if you look at the table the numbers come first

then
GOSUB DISPLAYCHAR

then

ASCCHAR = RPM DIG 2
This gives a value of 4

and so on to dig 4, you could make a loop to do this.

Not quite sure what happens if the value is below 1000, but you could easily check that prior to doing DIG 4 and put a blank there instead, skipping the DIG 4.

[Ramius]

Thank you and I am feeling incredibly stupid right now, even after 4 Excedrin's! I think I understand part of this, "RPM" is the variable where the RPM reading is stored? "DIG" is the number of digits to be displayed? So RPM DIG 4 would display 4 digits? Where do you inset the "ASCCHAR = RPM DIG 4? I think this line goes after "GOSUB SETLINE"? Then how do you display "RPM" in front of the reading? Please excuse what seems to be basic, simple questions and once I stop having brain craps things should get better!

Ed

[aerostar]

Thank you and I am feeling incredibly stupid right now, even after 4 Excedrin's! I think I understand part of this, "RPM" is the variable where the RPM reading is stored? "DIG" is the number of digits to be displayed? So RPM DIG 4 would display 4 digits? Where do you inset the "ASCCHAR = RPM DIG 4? I think this line goes after "GOSUB SETLINE"? Then how do you display "RPM" in front of the reading? Please excuse what seems to be basic, simple questions and once I stop having brain craps things should get better!

Ed

If I asked you what the 2nd digit was of 2400 (normal reading left to right) you would immediately tell me 4 - congratulations you have just done a DIG 2,

RPM is a variable name suggested where you would store the reading from whatever interface you have on the motors.


DIG X just gives you the value of the single digit starting from the left hand side.

so if as I said above your RPM was 2400

DIG 4 would return 0 ie the last digit of 2400.

DIG 2 would return 4 ie the second digit


You set the line where you want the data to be shown
set the cursor where you want the first character of your data to start



For "RPM" in front

ASCCHAR="R"
GOSUB GETSTVCHAR 'CONVERT ASCII TO STV
GOSUB DISPLAYCHAR

repeat the above 3 lines for "P", "M" and " "


now use the RPM word variable where you have stored your reading (RPM for instance)

ASCCHAR = RPM DIG 1
This gives a value of 2, and as it happens the character matrix in the chip will display 2 as if you look at the table the numbers come first

then
GOSUB DISPLAYCHAR

then

ASCCHAR = RPM DIG 2
This gives a value of 4
GOSUB DISPLAYCHAR


ASCCHAR = RPM DIG 3
This gives a value of 0
GOSUB DISPLAYCHAR

ASCCHAR = RPM DIG 4
This gives a value of 0
GOSUB DISPLAYCHAR


so on the screen at the line you have selected starting at the position you have selected, you would have RPM 2400

[Ramius]

Hi!
My code does not work!! NTSC. no longer displays which is understandable. The code complies and when I run it nothing is displayed! Must have missed something basic?

'****************************************************************
'*  Name    : NTSC-1                                            *
'*  Author  : Ed Cannady                                        *
'*  Notice  : Copyright (c) 2017                                *
'*          : All Rights Reserved                               *
'*  Date    : 06-30-17                                          *
'*  Version : 1.0                                               *
'*  Notes   : VIDEO IDENT                                       *
'*          : WITH GREAT HELP FROM AEROSTAR                     *
'****************************************************************

' WORKS USES SYNC FOR SWITCHING BETWEEN MIXED AND FULL TEXT MODE
' GOING FROM VID IN TO TEXT AND BACK TO VID IN
 
#CONFIG

    __config _HS_OSC & _WDT_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF
    
#ENDCONFIG
           
define  OSC 20
   
'---------------------------------------------------------------
'16f628a  ED definitions
 
    TVSDA        VAR PORTB.4    '0     OUTPUT to pin 11 of stv chip 
    CS0     	 VAR PORTB.6    '0     OUTPUT to pin 13 of stv chip 
    TVSCL     	 VAR PORTB.5    '0     OUTPUT to pin 12 of stv chip 
    SYNCH0       VAR PORTB.7    '1     INPUT  to pin 7  of stv chip 
'--------------------------------------------------------------- 

    ZOOMREG      CON %0000000011001100       ' 12 ZOOM REGISTER
    COLREG       CON %0000000011001101       ' 13 COLOUR REGISTER
    CONREG       CON %0000000011001110       ' 14 CONTROL REGISTER
    POSREG       CON %0000000011001111       ' 15 POSITION REGISTER 
    MODEREG      CON %0000000011010000       ' 16 MODE REGISTER

    
	ICOUNT  	 VAR BYTE
	BITCOUNTER 	 VAR BYTE
	WDATA   	 VAR WORD
	CHARCOUNTER	 VAR BYTE   
	LINECOUNTER	 VAR BYTE 


    STVCHAR      VAR BYTE
    ASCCHAR      VAR BYTE
    CHARS        VAR BYTE
    CHARS2       VAR BYTE
    TEMP         VAR BYTE 
    TEMP1        VAR BYTE
    COUNTER      VAR BYTE
    PULSES       VAR BYTE
    CURRENTMODE0 VAR BYTE
    PRPM         VAR WORD

'----------------------------------------------------------------     
'    TOPLEFT         CON 0
'    TOPMIDDLE       CON 5
'    TOPRIGHT        CON 10
'    BOTLEFT         CON 2560    '10*256
'    BOTMIDDLE       CON 2565 '(10*256)+ 5
'    BOTRIGHT        CON 2570 '(10*256)+ 10
'---------------------------------------------------------------- 

    DATA @0,"NTSC.",$FF,"NO SYNCHS RECEIVED",$FF   
 
    TRISB = %10001111

'----------------------------------------------------------------     

    PAUSE 500
    
	GOSUB Init
	
    PAUSE 500
	GOSUB Init
    
    CURRENTMODE0=255         ' FORCES TRYSYNCHS TO SET MODE FIRST TIME

	
Demo:

CHARCOUNTER = 0
	LINECOUNTER = 0
'   CURRENTMODE0 = 0     '0 = MIXED 1 = TEXT
    gosub CLS
    GOSUB TRYSYNCHS      '==================================


    TEMP = 0
  
     

LOOPER:
    PRPM = 6789
    GOSUB HEADER    ' LINE 3 RIGHT HAND SIDE TEST.
    IF CURRENTMODE0=1 THEN
    GOSUB NOVIDEO   ' DISPLAYS NO VIDEO IF NO INCOMING SYNCHS
    ENDIF

    
    GOSUB TRYSYNCHS       '===========================
    

'    PAUSE 500            'I/2 SECOND DELAY
'    TOGGLE HEARTBEAT     ' LED
    GOTO LOOPER           'DO IT FOREVER
  

DISPLAYCHAR:   

WDATA = %0001010000000000 + STVCHAR

'               11 10 9 8  7654 3210
' WDATA = %0001 0  1  1 1  0000 0000 + STVCHAR

' bit 11 = character background 0 = disabled 1 = enabled       

' bit 10 = red
' bit 09 = green
' bit 08 = blue

' 000 = black
' 001 = blue
' 010 = green
' 011 = cyan
' 100 = red
' 101 = magenta
' 110 = yellow
' 111 = white
    
' bit 7 = blink 1=enable 0=disable    
    
    GOSUB SEND 
     RETURN
SETLINE:    
	WDATA = LINECOUNTER*256 + CHARCOUNTER
    GOSUB Send              'position cursor   
    RETURN



WasteTime:        ' WORKS WITH LESS NOPS

    pauseus 20    ' was 20 nops
	RETURN

StartCommunication:
	TVSCL = 1 'HIGH TVSCL 
    GOSUB WasteTime

    CS0 = 0 'LOW CS0

    GOSUB WasteTime
	TVSCL = 0 'LOW TVSCL
    GOSUB WasteTime
	RETURN

StopCommunication:
	TVSCL = 1 'HIGH TVSCL
    GOSUB WasteTime
    CS0 = 1 'HIGH CS0

    GOSUB WasteTime
	RETURN

SendOne:
	TVSDA = 1 'HIGH TVSDA
    GOSUB WasteTime
	TVSCL = 0 'LOW  TVSCL
    GOSUB WasteTime
	TVSCL = 1 'HIGH TVSCL
    GOSUB WasteTime
	RETURN

SendZero:
	TVSDA = 0 'LOW TVSDA
    GOSUB WasteTime
	TVSCL = 0 ' LOW TVSCL
    GOSUB WasteTime
	TVSCL = 1 'HIGH TVSCL
    GOSUB WasteTime
	TVSDA = 1 'HIGH TVSDA
    GOSUB WasteTime
	RETURN

OutByte:
	FOR BITCOUNTER = 1 TO 16
    IF WDATA.15 = 1 THEN
    GOSUB SendOne
    ELSE
    GOSUB SendZero
    ENDIF
    WDATA = WDATA << 1
	NEXT BITCOUNTER
	RETURN

Send:
	GOSUB StartCommunication
	GOSUB OutByte
	GOSUB StopCommunication
	RETURN

'-------------------------------------------------------------  

Init:     '    PAUSE 50 added - seems to improve reliability of init

	TVSCL = 1 'HIGH TVSCL
    TVSDA = 1 'HIGH TVSDA
    CS0 = 1 'HIGH CS0
 
	WDATA = $3000  '%110000 00000000
    GOSUB Send     ' Init STV5730
    PAUSE 50
	WDATA = $3000
    GOSUB Send
    PAUSE 50
	WDATA = $00DB  '%00000000 11011011
    GOSUB Send
    PAUSE 50
	WDATA = $1000  '%00010000 00000000
    GOSUB Send
    PAUSE 50
'-------------------------------------------------------------  
	WDATA = %0000000011001100
    GOSUB Send     ' Init registers (point to register 12)
    PAUSE 50
'-------------------------------------------------------------      
	WDATA = %0001000000000000   'NORMAL
'   WDATA = %0001000011110000   '4 PIXELS HORIZ AND VERT
    GOSUB Send ' Zoom    ADDRESS 12
    PAUSE 50
'-------------------------------------------------------------      
	WDATA = %0001001000000000

'   WDATA = %0001001000000100
    GOSUB Send ' Color    ADDRESS 13
    PAUSE 50
'--------------------------------------------------------

    WDATA=  %0001101011010100
            'CHANGE BIT 0 TO 1 FOR TEXT ONLY
    GOSUB Send ' Control    ADDRESS 14
'-------------------------------------------------------------    
	WDATA = %0001011111001111
    GOSUB Send ' Position    ADDRESS 15
'------------------------------------------------------------- 

   
	WDATA = %0001000100101110 '$183E BIT 11 CHANGED TO 0  M4 = 0
   
    GOSUB Send ' Mode    ADDRESS 16  %0001100000111110

'------------------------------------------------------------- 
 
	WDATA = $00C0   '%00000000 11000000
    GOSUB Send ' Set row attributes
     
	FOR ICOUNT = 0 TO 10
    WDATA = $10C4 '%00010000 11000100
  	' WDATA =%0001000010000111
    GOSUB Send
	NEXT ICOUNT
	RETURN
 
CLS: 
    'character=$0B       'SPACE
     TEMP1=0   ' LINECOUNTER
     TEMP =0    'CHARCOUNTER
loop2:
    
	WDATA = 0  ' LINECOUNTER*256 + CHARCOUNTER   ADDRESS
    GOSUB Send
    

LOOP3:         ' :CHARACTERS        
	WDATA = %0001011100001011  ' 1011 0BH SPACECHARACTER
    GOSUB Send
	TEMP = TEMP + 1
	IF TEMP >= 28 THEN
    TEMP = 0
    TEMP1=TEMP1 + 1
	ENDIF
	IF TEMP1 >= 11 THEN SCREENBLANK
 	
    GOTO LOOP3
    
SCREENBLANK:
	RETURN

GETSTVCHAR:        ' CONVERT ASCII TO STV
    STVCHAR =$7F   ' FORCES CLOCK PICTURE IF ERROR         
    LOOKDOWN ASCCHAR,["0123456789- ABCDEFGHIJKLMNOPQRSTUVWXYZ:./'abcdefghijklmnopqrstuvwxyz"],STVCHAR
    RETURN 

HEADER:
    LINECOUNTER=12      'SET START POSITION
    CHARCOUNTER=1       'SET CURSOR POSITION
    GOSUB SETLINE
'    FOR CHARS2=0 TO 4
'    READ CHARS2, ASCCHAR
    ASCCHAR = "P"
    gosub GETSTVCHAR    'CONVERT ASCII TO STV
    GOSUB DISPLAYCHAR    
    ASCCHAR = "R"
    gosub GETSTVCHAR    'CONVERT ASCII TO STV
    GOSUB DISPLAYCHAR    
    ASCCHAR = "P"
    gosub GETSTVCHAR    'CONVERT ASCII TO STV
    GOSUB DISPLAYCHAR    
    ASCCHAR = "M"
    gosub GETSTVCHAR    'CONVERT ASCII TO STV
    GOSUB DISPLAYCHAR    
    ASCCHAR = PRPM DIG 1
    GOSUB DISPLAYCHAR    
    ASCCHAR = PRPM DIG 2
    GOSUB DISPLAYCHAR   
    ASCCHAR = PRPM DIG 3
    GOSUB DISPLAYCHAR    
    ASCCHAR = PRPM DIG 4
    GOSUB DISPLAYCHAR  
'   gosub GETSTVCHAR    'CONVERT ASCII TO STV
'   GOSUB DISPLAYCHAR
'    NEXT
    RETURN
    
NOVIDEO:
    LINECOUNTER=5       ' SET START POSITION
    CHARCOUNTER=4       ' SET CURSOR POSITION
    GOSUB SETLINE
    FOR CHARS2=6 TO 23  ' FROM EEPROM DATA
    READ CHARS2, ASCCHAR
    gosub GETSTVCHAR    ' CONVERT ASCII TO STV
    GOSUB DISPLAYCHAR
    NEXT
    RETURN
    
TRYSYNCHS:
    
    PULSES=0

    COUNT SYNCH0,4,PULSES' 3MS SHOULD COUNT TO 2 OR 3
    IF PULSES > 0 THEN MIXED0
    
FULL0:

    IF CURRENTMODE0=1 THEN RETURN

    WDATA=  %0000000011001110'CONTROL REGISTER
    GOSUB SEND
    WDATA=  %0001101011010101
'   CHANGE BIT 0 TO 1 FOR TEXT ONLY  ORIGINAL
            
'   WDATA=  %0001101111010100
'   CHANGE BIT 0 TO 1 FOR TEXT ONLY        
    GOSUB SEND

STAYHERE02:
  
    CURRENTMODE0=1
        GOSUB CLS
GOBACK0:
    RETURN


MIXED0:
    IF CURRENTMODE0=0 THEN RETURN
    WDATA=  %0000000011001110       ' CONTROL REGISTER
    GOSUB SEND
    WDATA=  %0001101011010100
    GOSUB SEND

STAYHERE01:

    CURRENTMODE0=0
    GOSUB CLS
    RETURN