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rlf rlf btfss movf andlw btfsc decf incf btfsc incf goto MT_Loop2
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EEDATA ^ 0x0100, w ; Start with the Odd Byte EEDATH ^ 0x0100, w MsgOffset ^ 0x0100, 0 ; Odd or Even Byte EEDATA ^ 0x0100, w ; Even Byte 0x07F ; Convert to ASCII 7 Bits STATUS, Z MsgTemp ^ 0x0100, f ; Decrement the Value Count MsgOffset ^ 0x0100, f ; Point to the Next Byte in the String STATUS, Z (MsgOffset + 1) ^ 0x0100, f MT_Loop1
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; Have Correct Offset, Now, Display the ; Message bcf STATUS, C ; Calculate Address of Next Word to rrf (MsgOffset + 1) ^ 0x0100, w ; Display addlw HIGH MsgTable movwf EEADRH ^ 0x0100 rrf (MsgOffset + 1) ^ 0x0100, w ; Setup Carry Correctly for rrf MsgOffset ^ 0x0100, w ; Increment addlw LOW MsgTable movwf EEADR ^ 0x0100 btfsc STATUS, C incf EEADRH ^ 0x0100, f ; If Carry Set, Increment to Next Page EEPReadMacro ; Now, Do the Program Memory Read rlf EEDATA ^ 0x0100, w ; Start with the Odd Byte rlf EEDATH ^ 0x0100, w btfss MsgOffset ^ 0x0100, 0 ; Odd or Even Byte movf EEDATA ^ 0x0100, w ; Even Byte andlw 0x07F ; Convert to ASCII 7 Bits btfsc STATUS, Z goto MT_End ; Zero, Yes SendCharMacro incf MsgOffset ^ 0x0100, f ; Point to the Next Byte in the String btfsc STATUS, Z incf (MsgOffset + 1) ^ 0x0100, f incf SMCount ^ 0x0100, f goto MT_Loop2 ; Finished sending out the Table Data ; Return the Number of Bytes Sent
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MT_End movf SMCount ^ 0x0100, w EmuReturn
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In this code there are three macros. The EEPReadMacro (along with the EEPWriteMacro) is used to access the Flash program memory of the PIC16F87x. SendCharMacro is used to poll the UART transmit holding register empty interrupt request ag (TXIF of PIR1) and send the byte when the holding register is open. The macro code is:
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SendCharMacro Macro bcf STATUS, RP1 ifndef Debug btfss PIR1, TXIF goto $ - 1 else goto $ + 3 nop endif movwf TXREG bcf PIR1, TXIF bsf STATUS, RP1 endm
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; Put in a Skip over the nop to save ; a Mouse Click ; ; Send the Byte Reset the Interrupt Request Flag
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and it should be noted that if the label Debug is de ned, the polling loop is ignored because in MPLAB, the USART hardware is not simulated and execution will never fall out of this loop. There are two other things to notice about this macro. The rst is in the code that executes when the Debug label is de ned. I kept two instructions to match the btfss/goto instructions of the polling loop, but I jump over the second one to save a mouse click when I m single-stepping through the application. This might seem like a petty place to save a mouse click or two, but SendCharMacro is used a lot in this application, and when single-stepping through the application, skipping over the instructions seems to reduce the number of mouse clicks signi cantly. The second point to notice about this macro is that it changes the operating bank from 2 to 0 and then back to 2. The EMU-II application has all its variables in Banks 2 and 3 of the PIC microcontroller. This allows the user to access almost all the registers (except for the USART speci c ones) in Banks 0 and 1 without affecting the operation of the EMU-II in any way. Instead of using the call and return instructions in the EMU-II, I used two macros, EmuCall and EmuReturn, which I wrote to implement a subroutine call that does not access the built-in program counter stack. The reason for writing these subroutines was to avoid the possibility that the subroutine calls in the EMU-II application code would affect the emulated application. The EmuCall and EmuReturn macros are:
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EmuCall Macro Address local ReturnAddr movwf tempw ^ 0x0100 incf FSR, f movlw LOW ReturnAddr movwf INDF incf FSR, f movlw HIGH ReturnAddr movwf INDF movlw HIGH Address movwf PCLATH ; ; ; Stackless Emulator Call Save the Call Value in w Setup the Return Address
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