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Joshua314

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Joined: 23 Oct 2006
Posts: 15

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PostPosted: Fri Mar 07, 2008 10:43 am    Post subject: Need Help MAX7456 Reply with quote

Hello @ all,

i have a MAX7456 OSD from Maxim.
I wrote a simple Source for it.
But the source doesn't work.

Have everyone a Idee ???

Thank's Thomas


Code:
'------------------------------------------------------------------
'                           MAX7456
'                          (c) DG5MPQ  01/2008
'------------------------------------------------------------------
$regfile = "M8def.dat"
$crystal = 8000000
$baud = 38400

Const Vm0 = &H00                                            ' Video Mode 0
Const Vm1 = &H01                                            ' Video Mode 1
Const Hos = &H02                                            ' Horizontal Offset
Const Vos = &H03                                            ' Vertical Offset
Const Dmm = &H04                                            ' Display Memory Mode
Const Dmah = &H05                                           ' Display Memory Address High
Const Dmal = &H06                                           ' Display Memory Address Low
Const Dmdi = &H07                                           ' Display Memory Data In
Const Cmm = &H08                                            ' Character Memory Mode
Const Cmah = &H09                                           ' Character Memory Address High
Const Cmal = &H0A                                           ' Character Memory Address Low
Const Cmdi = &H0B                                           ' Character Memory Data In
Const Osdm = &H0C                                           ' Osd Insertion Mux
Const Rb0 = &H10                                            ' Row 0 Brightness
Const Rb1 = &H11                                            ' Row 1 Brightness
Const Rb2 = &H12                                            ' Row 2 Brightness
Const Rb3 = &H13                                            ' Row 3 Brightness
Const Rb4 = &H14                                            ' Row 4 Brightness
Const Rb5 = &H15                                            ' Row 5 Brightness
Const Rb6 = &H16                                            ' Row 6 Brightness
Const Rb7 = &H17                                            ' Row 7 Brightness
Const Rb8 = &H18                                            '  Row 8 Brightness
Const Rb9 = &H19                                            ' Row 9 Brightness
Const Rb10 = &H1A                                           ' Row 10 Brightness
Const Rb11 = &H1B                                           ' Row 11 Brightness
Const Rb12 = &H1C                                           ' Row 12 Brightness
Const Rb13 = &H1D                                           '  Row 13 Brightness
Const Rb14 = &H1E                                           ' Row 14 Brightness
Const Rb15 = &H1F                                           ' Row 15 Brightness
Const Osdbl = &H6C                                          ' Osd Black Level
Const Stat = &HA0                                           ' Status
Const Dmdo = &HB0                                           ' Display Memory Data Out
Const Cmdo = &HC0                                           'Character Memory Data Out


Mosi Alias Portc.0
Config Mosi = Output

Miso Alias Pinc.1
Config Miso = Input

Sck Alias Portc.2
Config Sck = Output

Cs Alias Portc.3
Config Cs = Output

Res Alias Portb.0
Config Res = Output

Los Alias Pinb.1
Config Los = Input



Declare Sub Max7456out(daten As Byte)                       ' Schreibt 8 bit zum OSD
Declare Sub Max7456outb(byval Daten_b As Byte)
Declare Sub Max7456cs(byval Was As Byte)
Declare Function Max7456in() As Byte
Print "{013}MAX7456 Test"

Dim Help As Byte
Dim T As Byte



'Do

Print "Reset low"
 Reset Res
 Waitms 10
 Set Res
 Waitms 200
Print "Reset hi"


Call Max7456cs(0)
 Call Max7456outb(vm0)
 'Call Max7456outb(&B01001000)                               ' 1001100
 Call Max7456outb(&H4c)                                     ' 1001100
Call Max7456cs(1)

'(
Call Max7456cs(0)
 Call Max7456outb(osdbl)
  Print Max7456in()                                         ' 00001001
Call Max7456cs(1)
')



Call Max7456cs(0)
 Call Max7456outb(osdbl)
 Call Max7456outb(&H07)                                     ' 00001001
Call Max7456cs(1)


Call Max7456cs(0)
 Call Max7456outb(dmah)
 Call Max7456outb(&H00)
Call Max7456cs(1)

'(
Call Max7456cs(0)
 Call Max7456outb(dmm)
 Call Max7456outb(&B01000000)
Call Max7456cs(1)
')

Call Max7456cs(0)
 Call Max7456outb(dmal)
 Call Max7456outb(&H20)
Call Max7456cs(1)

Call Max7456cs(0)
 Call Max7456outb(dmdi)
 Call Max7456outb(&H0b)
Call Max7456cs(1)

Waitms 5000


'Loop

End

Sub Max7456outb(byval Daten_b As Byte)
  Call Max7456out(daten_b)                                  ' Schreibt 8 bit zum OSD
End Sub


Function Max7456in() As Byte                                ' Schreibt 8 bit zum OSD



 For Help = 7 To 0 Step -1                                  ' Wir haben 8 Bit MSB zu LSB

  Set Sck                                                   ' Clock anmachen
   Print "^";
  Reset Sck
   Print "!";                                               ' Clock wieder ausmachen

  If Miso > 0 Then                                          ' Ist das Bit gesetzt
   Set T.help
   Print "1";
  Else
   Reset T.help
   Print "0";                                               ' oder loeschen
  End If

 Next Help                                                  ' Und weiter
 Print ":" ; T ; ":" ; Hex(t);
 Max7456in = T
End Function


Sub Max7456out(daten As Byte)                               ' Schreibt 8 bit zum OSD

 Print Daten ; ":" ; Hex(daten) ; ":";
 For Help = 7 To 0 Step -1                                  ' Wir haben 8 Bit MSB zu LSB


  If Daten.help > 0 Then                                    ' Ist das Bit gesetzt
   Set Mosi                                                 ' Dann bit high machen
   Print "1";
  Else
   Reset Mosi
   Print "0";                                               ' oder loeschen
  End If

  Set Sck                                                   ' Clock anmachen
   Print "^";
  'For T = 1 To 5 : Next T
  'Waitms 10
  Reset Sck
   Print "!";                                               ' Clock wieder ausmachen
  'For T = 1 To 5 : Next T
   'Waitms 10
 Next Help                                                  ' Und weiter
  Print " "

End Sub


Sub Max7456cs(byval Was As Byte)
 Local I As Byte                                            ' Dummy

  If Was = 0 Then
   Reset Sck                                                ' Erst mal den Clk nach unten
   Reset Cs
   Print "!."
  Else
   Set Cs
   Print "'"
  End If

End Sub

End
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yah996

Bascom Member



Joined: 24 Sep 2006
Posts: 31
Location: Bergkirchen

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PostPosted: Sat Aug 09, 2008 10:11 pm    Post subject: Reply with quote

Hi,

any update on that?

http://www.grautier.com/grautier/index.php?/archives/60-C2OSD-V1.0.html#extended


Thanks,

K.
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pseddon

Bascom Member



Joined: 20 Oct 2006
Posts: 84

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PostPosted: Sun Aug 10, 2008 4:14 pm    Post subject: Reply with quote

I don't see a config spi or spiinit statement for a start.

I would suggest you look at the examples for using SPI to see how to read from and write to the SPI port.

regards Peter
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yah996

Bascom Member



Joined: 24 Sep 2006
Posts: 31
Location: Bergkirchen

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PostPosted: Sun Aug 10, 2008 8:23 pm    Post subject: Reply with quote

Here is my first code...

I tried to keep it simple. Also i tried SHIFTOUT command. No sucess yet.

$regfile = "M644def.dat"
$crystal = 18432000
$hwstack = 32
$swstack = 32
$framesize = 32


Declare Sub Send_spi

Open "com1:115200,8,n,1" For Binary As #1

Dim B As Byte
Dim Regaddr As Byte
Dim Regdata As Byte

' MAX7456 PIN.8 = Porta.7 ' SPI_CS
' MAX7456 PIN.9 = Porta.4 ' Dion
' MAX7456 PIN.10 = Porta.6 ' SPI_CK
' MAX7456 PIN.11 = Porta.5 ' Dout

Config Spi = Soft , Din = Porta.4 , Dout = Porta.5 , Ss = Porta.7 , Clock = Porta.6
Spiinit ' Init SPI

Print "MAX7456 DEMO"

'01001000' ; 0 , 1=PAL, 00=Auto Sync, 1=Enable OSD, 0=Enable OSD immer, 0=SW RST, 0=Enable Video Buffer
Regaddr = &H00
Regdata = &B01001000
Call Send_spi

'00010100' ; 0 = NA, 001=Background MODE Brightness 7%, 11=Blinking Time 160ms, 00=Blinking Duty Cycle BT:BT
Regaddr = &H01
Regdata = &B00010100
Call Send_spi

'00100000' ; 00=NA, 100000=No Horitzontal offset
Regaddr = &H02
Regdata = &B00100000
Call Send_spi

'00010000' ; 000=NA, 100000=No Vertical Offset
Regaddr = &H03
Regdata = &B00010000
Call Send_spi



Waitms 500

Regaddr = &H05
Regdata = &B00000000
Call Send_spi

Regaddr = &H06
Regdata = &B00000001
Call Send_spi

Regaddr = &H07
Regdata = &B00000001
Call Send_spi

Do
Loop


End


Sub Send_spi

B = Regaddr
Spiout B , 1
B = Regdata
Spiout B , 1

End Sub
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Antony(uk)

Bascom Member



Joined: 26 Jun 2006
Posts: 275
Location: Devon UK

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PostPosted: Tue Aug 12, 2008 9:18 pm    Post subject: Reply with quote

Hi
Did you get this working as I have just sent off for my samples.
This would offer a cheap and easy method of On Screen Display.
There are a lot of software samples out there all in "C".
I will wait for my samples before I start on this one.

Regards Antony(UK)
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steffus

Bascom Member



Joined: 19 Aug 2007
Posts: 30

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PostPosted: Tue Oct 21, 2008 9:33 pm    Post subject: Reply with quote

Any good news?

Reg
Steffen
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yah996

Bascom Member



Joined: 24 Sep 2006
Posts: 31
Location: Bergkirchen

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PostPosted: Wed Oct 22, 2008 1:22 pm    Post subject: Reply with quote

It pretty simple (Here is my basic code to get this working...)



$regfile = "M644def.dat"
$crystal = 18432000
$hwstack = 32
$swstack = 32
$framesize = 32

'** Configuration ****************************************
Declare Sub Send_spi
Declare Sub Read_spi
Open "com1:57600,8,n,1" For Binary As #1
$baud = 115200


Dim In_str As Byte
Dim B As Byte , X As Byte , I As Byte
Dim Regaddr As Byte
Dim Regdata As Byte

Print "MAX7456 ASM SPI-Mode"
Print "www.silicon-racing.com"
print "mail to yah996@yahoo.com to get the complete code""

Config Spi = Hard , , Master = Yes , Polarity = Low , Phase = 0 , Clockrate = 128 , Noss = 0
Spiinit


'01001000' ; 0 , 1=PAL, 00=Auto Sync, 1=Enable OSD, 0=Enable OSD immer, 0=SW RST, 0=Enable Video Buffer
Regaddr = &H00
Regdata = &B01001100
Call Send_spi

'00010100' ; 0 = NA, 001=Background MODE Brightness 7%, 11=Blinking Time 160ms, 00=Blinking Duty Cycle BT:BT
Regaddr = &H01
Regdata = &B01110100
Call Send_spi

''00100000' ; 00=NA, 100000=No Horitzontal offset
Regaddr = &H02
Regdata = &B00100000
Call Send_spi

'00010000' ; 000=NA, 100000=No Vertical Offset
Regaddr = &H03
Regdata = &B00100000
Call Send_spi


For I = 1 To 100

Regaddr = &H05
Regdata = &H00
Call Send_spi

Regaddr = &H06
Regdata = I
Call Send_spi

Regaddr = &H07
Regdata = I
Call Send_spi

Next I



Do

Loop ' never reached


End


Sub Send_spi

$asm
lds r17,{Regaddr}
Out Spdr , R17
Waitspi_1:
sbis spsr,7
rjmp WaitSPI_1

lds r17,{Regdata}
Out Spdr , R17
Waitspi_2:
sbis spsr,7
rjmp WaitSPI_2
$end Asm

End Sub


Sub Read_spi
End Sub
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tolisn

Bascom Member



Joined: 02 Jul 2005
Posts: 123
Location: Greece

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PostPosted: Wed Oct 22, 2008 5:20 pm    Post subject: Reply with quote

I'm trying to overlay a scale for comparison on a parking camera that I just installed in my car.
I would like it to look something like the photo.
Do you think that it can be done with this chip and Bascom using a ATmega8?
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yah996

Bascom Member



Joined: 24 Sep 2006
Posts: 31
Location: Bergkirchen

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PostPosted: Wed Oct 22, 2008 6:08 pm    Post subject: Reply with quote

Yes!

Your Mega needs to have a Hardware SPI and some bytes of RAM.
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tolisn

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Joined: 02 Jul 2005
Posts: 123
Location: Greece

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PostPosted: Wed Oct 22, 2008 6:50 pm    Post subject: Reply with quote

Thanks for the reply.
1. Looking at your code above, is the "For I... loop responsible for putting the characters on the screen?
2. Can you put the characters into a desired location on the screen and how ?

While I'm waiting for the sample I though I should do a little homework Very Happy
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mextal

Bascom Member



Joined: 11 May 2006
Posts: 47
Location: The Netherlands

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PostPosted: Mon Dec 15, 2008 4:34 pm    Post subject: Reply with quote

Hello,

I have a project with the max7456 and i have text on screen but if i use de default offset for collum/row the not all charators are visable ??

Has some one a solution for this?

Tiny
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yah996

Bascom Member



Joined: 24 Sep 2006
Posts: 31
Location: Bergkirchen

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PostPosted: Mon Dec 15, 2008 7:54 pm    Post subject: Reply with quote

mextal wrote:
Hello,

I have a project with the max7456 and i have text on screen but if i use de default offset for collum/row the not all charators are visable ??

Has some one a solution for this?

Tiny


Hello,

do you have a picture? What kind of monitor are you using? Real television monitor?

I had some troubles with an PC tv-card...

Greets,
K.
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Evert :-)

Bascom Expert



Joined: 18 Feb 2005
Posts: 2107

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PostPosted: Mon Feb 23, 2009 2:04 pm    Post subject: Reply with quote

For everybody how is interested i have made some routines for the MAX7456 video overlay in Bascom.
Also included a tool to make your own characters.
Read more HERE.


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Antony(uk)

Bascom Member



Joined: 26 Jun 2006
Posts: 275
Location: Devon UK

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PostPosted: Mon Feb 23, 2009 3:01 pm    Post subject: Reply with quote

Hi Evert
Thatís so nice...I have been playing with this for sooooo long.
I know I am a pain in the neck...But could you please do a connection drawing or point me in the right direction..

I have been using the BOB4 system But its bulky.

Regards Antony(UK)

B.T.W. is it possible to display a variable directly :- Videotext variable, y , x
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Evert :-)

Bascom Expert



Joined: 18 Feb 2005
Posts: 2107

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PostPosted: Mon Feb 23, 2009 4:13 pm    Post subject: Reply with quote

Hi Anton,

Schematic is really simple, is the same as in the datasheet. Schematic that i used is attached (login to see)
Connected it with hardware SPI to an M128, so it should work with every AVR with a spi bus. Didn't tested it with software SPI bus.
Of course you can work with variable, variable and text string together must be done in 2 steps. You know that Bascom only want to do 1 think at each line.

Code:

A= 123
Temptextstring = "Hello world " + A + " greetings"  
Videotext Temptextstring , 2 , 3
 

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