Resolved: PIC10F200 OSCCAL.FOSC4

[B D]

GCBASIC compiler has a bug for PIC10F200
OSCCAL.FOSC4 = 1 modifies CAL0 (bit 1) instead of bit 0
I checked the generated .asm file and found the bug.

[Anobium]

Thank you.

Use OSCCAL.0 = 1 as a workaround.

i will look into a method to resolve.

[Anobium]

Replace your timer.h with the attached. \gcstudio\gcbasic\include\lowlevel folder.

This isolates the CONSTTANT FOSC4 if a register.bit called FOSC4 exists.

This only impacts the 10F2xx chips. 6 microcontrollers.

[Anobium]

This now generates the correct ASM

    #chip 10F200
    #option Explicit

    OSCCAL.FOSC4 = 1
    FOSC4 = 1

    Dim AssignBotValueTOVar as Byte = FOSC4

    If OSCCAL.FOSC4 = 1 Then 
        NOP ' do code
    End If

    If FOSC4 = 1 Then 
        NOP ' do code
    End If

    InitTimer1 Timer_FOsc4, PS1_8

ASM expanded to BIT addresses to show actual register.bit address.

;'OSCCAL.FOSC4 = 1
    BSF OSCCAL,0
;'FOSC4 = 1
    BSF OSCCAL,0
;'DIM ASSIGNBOTVALUETOVAR AS BYTE = FOSC4
    CLRF    ASSIGNBOTVALUETOVAR
    BTFSC   OSCCAL,0
    INCF    ASSIGNBOTVALUETOVAR,F
;'IF OSCCAL.FOSC4 = 1 THEN
    BTFSC   OSCCAL,0
;'NOP ' DO CODE
    NOP
;'END IF
;'IF FOSC4 = 1 THEN
    BTFSC   OSCCAL,0
;'NOP ' DO CODE
    NOP
;'END IF
;'INITTIMER1 TIMER_FOSC4, PS1_8
    MOVLW   1
    MOVWF   TMRSOURCE
    MOVLW   48
    MOVWF   TMRPRES
    CALL    INITTIMER1

[Anobium]

I have also added an inspection in the CDF output file.

Using the old compiler ( same that you have ) you would see.

  DUPLICATE CONSTANT/BIT NAMES:
  --------------------------------
  AMBIGUOUS: FOSC4

With the new timer.h and the compiler updated to report ambigous bits, you will see.

          DUPLICATE CONSTANT/BIT NAMES:
          --------------------------------
          None found

I hope this helps.

[B D]

Thanks for your interest and for taking your time.