Bascom Prog für TLC2543

[Heiko (Gast)]

Hallo Bascom Freunde,

ich habe auf der MCS Page folgendes Beispiel für den AD-Converter
TLC 2543 gefunden, leider ist es nur für 8051er geschrieben.

Könnt Ihr mir behilflich sein bei der der Anpassung an einen AVR
90S2333.

Gruß Heiko

'
   ' EXAMPLE PROGRAM FOR DOMO - I
   '
   ' READ ANALOG INPUTS
   '
   ' (C) 1999 IBERCOMP SA - Writen by MIGUEL ZUÑIGA
   '
   $large
   Config Lcdpin , Db4 = P2.4 , Db5 = P2.5 , Db6 = P2.6 , Db7 = P2.7 , E 
= P2.1 , Rs = P2.2
   Config Sda = P1.0
   Config Scl = P1.1

   Dim Num As Byte
   Dim State As Word
   Declare Sub Rw_tlc2543c (num As Byte)
   declare Sub Read_analog (num As Byte)
Init:
   'Assembler code is needed because BASCOM do not handle R/-W line
   'for LCD, so this must be put manually to low before initialise
   'display.
   $asm
      MOV   C, P2.0
      CLR   P2.0
      JNC   continue
      LJMP  0
   Continue:
   $end Asm
   Waitms 500                                                 'Needed to 
prevent ISP accesing (ATMEL ISP Bug)

   Cls
   Lcd "     "
   Locate 1 , 1
   Lcd " ANALOG  INPUTS "


   Do
      State = 9
      Read_analog 0
      Locate 2 , 3
      Lcd State ; "     "
      Locate 2 , 1
      Lcd " "
      Waitms 500
      Locate 2 , 1
      Lcd "*"
      Waitms 500
   Loop

Eoc Alias P3.3                                                ' End of 
Conversión
Clk Alias P3.4                                                ' 
Comunications clock
Di Alias P3.5                                                 ' Data In
Do Alias P1.2                                                 ' Data Out
Cs Alias P1.3                                                 ' Chip 
Select
   '
   ' Routine that reads an analog Input
   '
   Sub Read_analog (num As Byte)
      Num = Num * 16                                          ' Ask 
conversion on requested chanel
      Rw_tlc2543c Num
      Rw_tlc2543c 0                                           'Read 
result of conversion
   End Sub
   '
   ' Routine that access to TLC 2543C Anlog->Digital conversor
   ' (LOW LEVEL)
   Sub Rw_tlc2543c (num As Byte)
   $asm
      mov   DPL, {num}
      setb  CS       ;Initially chip is not selected
      clr   CLK      ;Clock signal is at low level
      nop            ;Wait at leat 1 us for stability
      nop
      clr   CS       ;Select conversor
      mov   B, #8    ;First write/read 8 bits
Bucle0:
      mov   A, DPL    ;Puts the most significative bit on C
      rlc   A
      mov   DPL, A
      mov   DI, C    ;Write C value to DI signal
      mov   C, DO    ;Reads DO signal in Carry
      mov   A, DPH    ;and save it with a carry rotation
      rlc   A
      mov   DPH, A
      setb  CLK      ;Pulse on CLK signal
      nop
      nop
      clr   CLK
      djnz  B, bucle0
      mov   DPL, #0
      mov   B, #4    ;Now reads 4 bits
Bucle1:
      mov   C, DO    ;Reads DO signal in Carry bit
      mov   A, DPL    ;and save it with a carry rotation
      rlc   A
      mov   DPL, A
      setb  CLK      ;Pulse on CLK signal
      nop
      nop
      clr   CLK
      djnz  B, bucle1
      ; Dpl Contents 4 Less Significant Bits
      ; Dph Contents 8 Most Significant Bits
      setb  CS
      mov   A, DPH
      Swap A
      push  ACC
      anl   A, #15
      mov   DPH, A
      pop   ACC
      anl   A, #&H0F0
      orl   A, DPL
      mov   DPL, A
Bucle2:
      jnb   EOC, bucle2 ;Wait for conversion
      mov   {state}, DPL     ;LSB
      mov   {state+1}, DPH   ;MSB
   $end Asm
   End Sub

[ThomasB (Gast)]

Hallo Heiko
Warum Externe AD-Wandler?.
Der 2333 hat doch 6 Stück an Bord ;-)
Mit BASCOM-AVR ist es doch einfacher die Internen AD-Wandler zu
programmieren,siehe Anhang
MfG ThomasB

[Heiko (Gast)]

Hi Thomas,

Nur leider sind die internen ADC´s auf 10Bit begrenzt.
und der TLC2543 hat 12Bit also 4096 nicht nur 1024, das macht schon eine 
Menge aus.

MFG
Heiko