; ;********************************************************************** ; oututil.asm - Output String Utilities ;********************************************************************** ; ; created 3/11/98 -jea ; modified 4/17/98 -jea ; ; Several utilites are provided to help generate output strings: ; ; CpyTbl2Out is a macro which takes the program memory table address ; as a parameter and copies the table into the buffer pointed to by ; cmdOutPtr, using FSR0, until reaching a terminating 0. ; ; Hex2Buf and Dec2Buf are functions which convert the value in W ; from hex or decimal to ascii, storing the resulting string in the ; output buffer pointed to by cmdOutPtr. The digit string is then 0 ; terminated. ; ; ***** Variables for string utilities ***** ; cblock ; declare bank 0 variables cnvrtVal ; value to be converted to ascii cnvrtDigit ; digit currently being converted endc ; ; ***** Executable code for string utilities ***** ; ;********************************************************************* CpyTbl2Out macro TblAddr ; macro to copy constant ascii strings from program memory to a gpr ; buffer. Uses table reads from program memory and indirect ; addressing, via FSR0, into data memory. Calls Tbl2Buf function ; after initalization of input parameter via macro text substitution ;********************************************************************* movlw high(TblAddr) ; load upper byte of output string addr movwf TBLPTRH ; place it in the table pointer hi movlw low(TblAddr) ; load lower byte of output string addr movwf TBLPTRL ; place it in the table pointer lo movfp cmdOutPtr, FSR0 ; load FSR0 with output buffer addr call Tbl2Buf ; copy string into output buffer movpf FSR0, cmdOutPtr ; save current output buffer location endm ; ;********************************************************************* CpyTbl2Buf macro TblAddr, BufAddr ; macro to copy constant ascii strings from program memory to a gpr ; buffer. Uses table reads from program memory and indirect ; addressing, via FSR0, into data memory. Calls Tbl2Buf function ; after initalization of input parameter via macro text substitution ;********************************************************************* movlw high(TblAddr) ; load upper byte of output string addr movwf TBLPTRH ; place it in the table pointer hi movlw low(TblAddr) ; load lower byte of output string addr movwf TBLPTRL ; place it in the table pointer lo movlw BufAddr ; load literal buffer addr into W movfp WREG, FSR0 ; load FSR0 with buffer addr call Tbl2Buf ; copy string into output buffer movpf FSR0, WREG ; put terminating null location in W endm ; ;********************************************************************** Tbl2Buf ; Function to copy a program memory table to a ram string buffer ;********************************************************************** ; ; Copy 0 terminated string data from a program memory table to a ; ram buffer. Input consists of the TBLPTRH and L preloaded with ; the table addr and the ram buffer addr in FSR0. On return ; FSR0 contains a pointer to the terminating null. The DataByte ; flag in the cmdFlags register, declared in the Cmd function, is ; used to track whether the last table read was the hi or lo byte. ; tablrd 0, 1, WREG ; perform dummy read to init TABLAT bcf cmdFlags, DataByte ; init cmdFlags causing hi read first TblBfLp ; loop here to copy entire string btfss cmdFlags, DataByte ; if last table byte read was hi then skip tlrd 1, INDF0 ; otherwise fetch upper byte btfsc cmdFlags, DataByte ; if last table byte read was lo then skip tablrd 0, 1, INDF0 ; otherwise fetch lower byte btg cmdFlags, DataByte ; toggle bit indicating hi or lo byte read tstfsz INDF0 ; skip if new value is 0 goto $+2 ; otherwise continue copy return ; end of string, return from copy incf FSR0 ; point to next buffer location goto TblBfLp ; get next string char ; ;********************************************************************** Dec2Buf ; Function to convert a decimal number into an ascii string buffer ;********************************************************************** ; ; Interprets the input number as decimal and converts it into a ; 0 terminated ascii string. Input is comprised of the number to be ; converted in W and the addr of the string buffer in cmdOutPtr. On ; return cmdOutPtr points to the concatinated 0 termination. ; [ed: see also: ; Binary to BCD half-packed 8 bit to 3 digit ; Binary to BCD packed and ASCII, 32 bit to 10 digits ; ] movwf cnvrtVal ; store number in cnvrtVal movfp cmdOutPtr, FSR0 ; load FSR0 with output buffer addr clrf cnvrtDigit ; init current conversion digit bcf cmdFlags, Hundreds ; clear hundreds flag DecHuns ; generate hundreds digit movlw 99 ; load 99 decimal cpfsgt cnvrtVal ; skip if cnvrtVal is 3 decimal digits goto NoDcHns ; otherwise goto no hundreds conversion incf cnvrtDigit ; increment current digit movlw 100 ; load 100 decimal subwf cnvrtVal ; subtract it from cnvrtVal goto DecHuns ; continue to convert hundreds NoDcHns ; no more hundreds digits tstfsz cnvrtDigit ; skip if current digit is 0 goto $+2 ; otherwise setup hundreds digit goto DecTens ; no hundreds, convert tens bsf cmdFlags, Hundreds ; set flag indicating hundreds not 0 movlw '0' ; load ascii 0 into W addwf cnvrtDigit, W ; add cnvrtDigit to ascii 0 movwf INDF0 ; store current digit char into buffer clrf cnvrtDigit ; clear current digit incf FSR0 ; increment buffer pointer DecTens ; generate tens digit movlw 9 ; load 9 decimal cpfsgt cnvrtVal ; skip if cnvrtVal is 2 decimal digits goto NoDcTns ; otherwise goto no tens conversion incf cnvrtDigit ; increment current digit movlw 10 ; load 10 decimal subwf cnvrtVal ; subtract it from cnvrtVal goto DecTens ; continue to convert tens NoDcTns ; no more tens digits tstfsz cnvrtDigit ; skip if current digit is 0 goto $+3 ; otherwise setup tens digit btfss cmdFlags, Hundreds ; if hundreds nonzero setup anyway goto DecOnes ; otherwise no tens, convert ones movlw '0' ; load ascii 0 into W addwf cnvrtDigit, W ; add cnvrtDigit to ascii 0 movwf INDF0 ; store current digit into buffer clrf cnvrtDigit ; clear current digit incf FSR0 ; increment buffer pointer DecOnes ; generate ones digit unconditionally movlw '0' ; load ascii 0 into W addwf cnvrtVal, W ; add remaining cnvrtVal to ascii 0 movwf INDF0 ; store current digit into buffer incf FSR0 ; increment buffer pointer clrf INDF0 ; terminate converted string with 0 movpf FSR0, cmdOutPtr ; save current output buffer location return ; return from convert ; ;********************************************************************** Hex2Buf ; Function to convert a hex number into an ascii string buffer ;********************************************************************** ; ; Interprets the input number as hexidecimal and converts it into a ; 0 terminated ascii string. Input is comprised of the number to be ; converted in W and the addr of the string buffer in cmdOutPtr. On ; return cmdOutPtr points to the concatinated 0 termination. ; movwf cnvrtVal ; store number in cnvrtVal movfp cmdOutPtr, FSR0 ; load FSR0 with output buffer addr ; load upper nibble into cnvrtDigit for conversion movlw 0xF0 ; load upper nibble mask andwf cnvrtVal, W ; mask upper nibble into W movwf cnvrtDigit ; store nibble in current digit swapf cnvrtDigit ; swap value into lower nibble ; convert current digit to ascii movlw 9 ; load highest decimal digit cpfsgt cnvrtDigit ; skip if current digit is greater goto $+3 ; otherwise convert as decimal movlw 'A' - 0x0A ; load ascii A - hex A conversion constant goto $+2 ; goto store char in buffer ; decimal digit movlw '9' - 0x09 ; load ascii 9 - hex 9 conversion constant ; store converted char in buffer and test for completion addwf cnvrtDigit, W ; convert to ascci char in W movwf INDF0 ; store char in buffer incf FSR0 ; increment buffer pointer ; load lower nibble into cnvrtDigit for conversion movlw 0x0F ; load lower nibble mask andwf cnvrtVal, W ; mask lower nibble into W movwf cnvrtDigit ; store nibble in current digit ; convert current digit to ascii movlw 9 ; load highest decimal digit cpfsgt cnvrtDigit ; skip if current digit is greater goto $+3 ; otherwise convert as decimal movlw 'A' - 0x0A ; load ascii A - hex A conversion constant goto $+2 ; goto store char in buffer ; decimal digit movlw '9' - 0x09 ; load ascii 9 - hex 9 conversion constant ; store converted char in buffer and test for completion addwf cnvrtDigit, W ; convert to ascci char in W movwf INDF0 ; store char in buffer incf FSR0 ; increment buffer pointer clrf INDF0 ; terminate converted string with 0 movpf FSR0, cmdOutPtr ; save current output buffer location return ; return from convert ; end of file oututil.asm *****************************************************
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