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; ;***************************************************************************** ; ; This program provides a table based command line monitor accessable to a ; user via an ascii terminal (9600,8,n,1) connected to USART1 or ; accessable via interprocessor communication over the i2c bus. ; ; All PICos source files are intended to be viewed with tabs set to 4 spaces. ; ; Input is echoed back to the USART and accumulated in a buffer one character ; at a time. Each command line of text is delivered to the command processor ; Cmd when it is terminated by a CR character. The file uart1.asm contains ; the user I/O utilities. ; ; Input is also accumulated by the i2c slave peripheral. The first byte ; received is the sending devices i2c slave address and the next byte is a ; count of the bytes to follow. Once the transmission is complete the buffer ; is submitted to Cmd just as if it had been entered by a user. ; ; Each command line is passed to a command processor which matches it against ; the commands listed in a program memory table. Each table entry contains ; a format string to match the command against, a function address to involke ; if the string matches and a string describing the command. The table begins ; at the address CmdMenu and the entry for each command is added using a block ; of directives at the beginning of the function for that command. Therefore ; the source for the function and the command table entry are all coded ; together in one source location which can even be in another file. If so ; this file must be included. If a function provides a non null output ; string this string is submitted back to the command processor at the source ; which provided the command, i.e. If the command was entered locally by a ; user via the usart then the result string is resubmitted to the local Cmd. ; If the command was received from the i2c slave then the result string is ; trasnmitted back to the sending device to be executed there. Typically ; the function executed by a result string is u1: which transmits the string ; parameter via the local usart providing output to the user including ; redrawing the command prompt. ; ; NOTE: CR terminates command input buffer ; 0 terminates string parameter overwriting CR ; LF terminating output string causes ui: to redisplay cmd line prompt ; Therefore strings output by functions must end in \n\r since \r is replaced ; with a 0 by Cmd when parsing the string parameter for u1: and the remaining ; \n causes u1: to redraw the prompt. ; ; Revision history: ; John E. Andrews Version equ 0x0104 ; machine readable version 1.04 ; Oct 17th 1998 ver 1.04 - Qualcomm Hardware Test Platform ; fix EE byte read and write, add register and bit read and write ; Mar 22nd 1998 ver 1.03 - ESC East Chicago ; I2C remote command execution and response protocol ; Mar 13th 1998 ver 1.02 - '756 workshop San Diego ; Modular CmdMenu table entry definition along with function source ; Feb 13th 1998 ver 1.01 - Disti FAE certification San Diego ; Modular peripheral isr bit test macro InstallIsr ; Feb 7th 1998 ver 1.00 ; Initial command monitor ; ; Needed Improvements: ; 1) port to MPLINK (use relocatable object modules) ; 2) elliminate buffer copy w/ string parameters in Cmd, especially for u1: ; use pointer to string in cmdPrmBuff, leave string were it is? ; 2.1) string parameters containing CR screw up the parameter copy ; 2.1.1) s param copy should be to next format string char not CR ; 2.2) Cmd buffer management is weak overall, need system strategy ; 3) make cmd line parameters compatible with C17 auto input variables ; 4) make command line of CR only reexecute last cmd entered ; 5) eeprom routines need to be converted to byte count based binary ; 6) major error (nack) detection needed in i2c, even before arbitration ; 7) add interprocess cmd ready flag like rxRdy and i2cRxRdy elim return cmd? ; 8) StartTx doesn't handle special characters. Need a subroutine called by ; UART1Tx isr and StartTx called U1TxByte. (rename UART1Tx to U1TxIsr) ; 9) Interactive user I/O while command is running ; ;***************************************************************************** ; ; specify processor, default constant radix, spaces/tab, and width list p=17C756,r=dec,b=4,c=132 #include <p17C756.inc> ; include processor specific declarations ; specify microcontroller mode, WDT off, Brown out on, external clock __CONFIG _MC_MODE & _WDT_OFF & _BODEN_ON & _EC_OSC ; don't produce the following listed messages and warnings errorlevel -207, -302, -305 ; ; Suppressed Warnings ; 207 Found label after column 1. ; A label was found after column one, which is often due to a ; misspelled opcode. ; ; Suppressed Messages ; 302 Register in operand not in bank 0. ; Ensure that bank bits are correct. ; Register address was specified by a value that included the ; bank bits. For example, RAM locations in the PIC16CXX are ; specified with 7 bits in the instruction and one or two ; bank bits. ; 305 Using default destination of 1 (file). ; If no destination bit is specified, the default is used. ; ;***************************************************************************** ; Reset Vector ;***************************************************************************** ; org 0 ; reset vector location goto Start ; goto beginning of execution after reset ; ;***************************************************************************** ; Peripheral Interrupt Vector ;***************************************************************************** ; org 0x20 ; ***** Variable and symbol declarations for peripheral int ***** cblock 0x1A ; declare unbanked variables ALUSTA_S ; context save variables for isr BSR_S WREG_S PCLATH_S FSR0_S FSR1_S ; last unbanked location endc ; ***** Executable code for peripheral int ***** ; save context movfp ALUSTA, ALUSTA_S ; save ALUSTA movfp BSR, BSR_S ; save BSR movfp WREG, WREG_S ; save WREG movfp PCLATH, PCLATH_S ; save PCLATH movfp FSR0, FSR0_S ; save FSR0 movfp FSR1, FSR1_S ; save FSR1 ; ; All interrupt flag tests and the jumps to the associated isr ; functions are installed here via usage of the InstallISR macro. ; ; init the MPASM variable to the current assembly time PC value CurIsrTstAdr = $ ; ;********************************************************************** InstallISR macro IFRegBank, IFReg, IF ; ; IFRegBank - sfr bank containing register with interrupt flag ; IFReg - register address containing interrupt flag bit ; IF - high active interrupt flag bit ; ; This macro allows installation at assembly time of isr functions ; at any source code location. This permits source code for the isr ; and the bit testing that occurs at the processors interrupt vector, ; and determines which isr to involke, to be located with the source ; code for other associated functions, even in other files. When MPASM ; assembles the source the org statements cause the executable to be ; placed at the correct locations. ; ; This macro must be used immediately following the label at the ; beginning of the isr function and prior to any executable code. ; ; Note: This is only a macro definition, code is generated where the ; macro is used at the beginning of the isr function. ;********************************************************************** ; InlinePC = $ ; save current inline assembly PC value org CurIsrTstAdr ; set assembly PC to addr for new isr test movlb IFRegBank ; switch to the sfr bank containing the reg btfsc IFReg, IF ; skip if the int flag in its reg is clear btfss IFReg+1, IF ; IF is set, skip if IE is set in next reg goto $+3 ; jump to test next installed int flag call InlinePC ; int is active so call isr function goto ExitInt ; then goto restore context and exit int CurIsrTstAdr = $ ; set current tst addr to next entry org InlinePC ; begin isr code gen at inline address endm ; end of isr install macro ; ; InstallISR is composed of 6 instructions. This org allows room for ; 10 interrupts to have service routines installed. org $ + 60 ; ExitInt ; restore context and exit interrupt movfp FSR1_S, FSR1 ; FSR1 movfp FSR0_S, FSR0 ; FSR0 movfp PCLATH_S, PCLATH ; restore PCLATH movfp WREG_S, WREG ; restore WREG movfp BSR_S, BSR ; restore BSR movfp ALUSTA_S, ALUSTA ; restore ALUSTA retfie ; return from int ; ; **** end of peripheral interrupt processing **** ; ;***************************************************************************** ; Included code begins here after isr return ;***************************************************************************** ; ; utility and driver files included here include "oututil.asm" ; output string generation utilities include "uart1.asm" ; uart1 isr and init code CurCmdMenuAdr = CmdMenu ; starting addr for CmdMenu entries ; Note: must be before files are included ; ***** Note: Include files here to add commands to PICos **************** include "stdcmd.asm" ; standard PICos commands include "capcmd.asm" ; capture commands include "a2dcmd.asm" ; a/d commands include "pwmcmd.asm" ; pwm commands include "i2ccmd.asm" ; i2c commands include "lcd.asm" ; lcd module utilities ; ;***************************************************************************** ; Entry Point from Reset Vector ;***************************************************************************** ; Start ; start execution here after reset ; call InitLCD ; init lcd flag byte ; call InitU1 ; init USART1 ; call InitI2C ; init I2C state var ; ; init peripheral and global interrupts bcf INTSTA, PEIF ; init periph int flag bsf INTSTA, PEIE ; enable periph ints bcf CPUSTA, GLINTD ; enable global ints ; ; init portd as debug LED outputs displaying i2c slave address movlb 1 ; select SFR bank for PORTD clrf DDRD ; set to all outputs movlw DfltSlvAddr ; load default i2c slave addr into W movwf PORTD ; display on portd ; ; preload rxBuffer w/ null command to gen first prompt movlw '\r' ; load CR char movwf rxBuffer ; into uart1 Rx buffer bsf u1Flags, RxRdy ; set bit to tell wait loop to process ; ;********************************************************************** ; Main loop of command monitor ;********************************************************************** ; Wt4Cmd ; wait here for next cmd line from uart1 or i2c slave btfsc u1Flags, RxRdy ; skip if no new UART1 data buffer ready call U1Rdy ; otherwise uart1 has cmd buffer ready btfsc i2cFlags, i2cRxRdy ; skip if no new i2c data buffer ready call I2CRdy ; otherwise i2c has cmd buffer ready goto Wt4Cmd ; retest until input is ready ; U1Rdy ; a locally entered cmd line is ready from uart1 movlw rxBuffer ; load cmd buffer addr into W call Cmd ; process cmd line ; output string is returned in cmdOutBuff movlw cmdOutBuff ; load addr of output buffer into W tstfsz cmdOutBuff ; skip if output buffer is null goto $-3 ; otherwise resubmit output to Cmd ; reset USART1 Rx buffer pointers movlw rxBuffer-1 ; load prestart of Rx buffer movwf rxPtr ; into Rx buffer pointer bsf u1Flags, RstRxPtr ; tell isr to reset IntRx pointer bcf u1Flags, RxRdy ; clear data ready flag return ; return to wait for next command ; I2CRdy ; a new cmd line is ready from i2c bcf i2cFlags, i2cRxRdy ; clear flag: no new i2c data buffer ready movlw i2cRxBuffer ; load cmd buffer addr into W call Cmd ; process cmd line ; output string is returned in cmdOutBuff movlw cmdOutBuff ; load start of output buffer into W tstfsz cmdOutBuff ; skip if output buffer is null call KickI2CRpy ; otherwise start int based reply on i2c return ; return to wait for next command ; ;********************************************************************** Cmd ; Command Processor ;********************************************************************** ; ; Parse and execute received cmd based on format strings stored in ; program memory table at location CmdMenu. The received cmd buffer ; pointer is passed in as a parameter in W. The cmd format strings ; specify the text and input parameters that are matched against ; the characters in the cmd buffer. If a cmd line is identified ; by a format string then execution is redirected to the function ; address which is stored after the format string in each CmdMenu ; table entry. Input parameters are converted from ascii as ; decimal or hexidecimal integers or as strings and passed to the ; cmd functions in the command parameter buffer: cmdPrmBuff. Each ; cmd function generates an output string in the buffer starting at ; address cmdOutBuff. During command parsing FSR0 is used to point ; into the command string buffer and FSR1 points into the parameter ; buffer. ; ; ***** Variable and symbol declarations for command processor ***** ; cmdPrmBuffSize equ 30 ; size of buffer for command parameters cmdOutBuffSize equ 40 ; size of buffer for command output ; cblock cmdPrmC ; cmd parameter digit count cmdPrmBuff: cmdPrmBuffSize ; cmd parameter buffer cmdTblChar ; CmdMenu table value cmdBuffPtr ; head of cmd buffer provided as input in W cmdFlags ; flags for cmd proccessor cmdOutBuff: cmdOutBuffSize+10 ; cmd function output buffer cmdOutPtr ; ptr to current location in output buff testaddr ; dummy to show address of end of used ram endc ; ; bit flag definitions for cmdFlags CmdByte equ 0 ; last cmd byte from TABLAT was hi or lo DataByte equ 1 ; last data byte from TABLAT was hi or lo Hundreds equ 2 ; number > 100 in decimal to ascii conv ; ; ***** Executable code for command processor ***** ; ; support lcd command line display here? ; call Cmd2LCD ; display new cmd line on LCD ; Parse and execute cmd line movwf FSR0 ; load cmd buffer addr into FSR0 movwf cmdBuffPtr ; save cmd buffer start in cmdBuffPtr movlw cmdPrmBuff ; load cmd parameter buffer addr movwf FSR1 ; into FSR1 movlw high(CmdMenu) ; load upper byte of menu addr movwf TBLPTRH ; place it in the table pointer movlw low(CmdMenu) ; load lower byte of menu addr movwf TBLPTRL ; place it in the table pointer tablrd 0, 1, WREG ; perform dummy read to init TABLAT bcf cmdFlags, CmdByte ; init CmdByte flag causing hi read first ; RdTbl ; FSR0 points to cmd char, read next format string char from CmdMenu btfss cmdFlags, CmdByte ; if last table byte read was hi then skip tlrd 1, cmdTblChar ; otherwise fetch upper byte btfsc cmdFlags, CmdByte ; if last table byte read was lo then skip tablrd 0, 1, cmdTblChar ; otherwise fetch lower byte btg cmdFlags, CmdByte ; toggle bit indicating hi or lo byte read ; ; analyze the format string and compare with each cmd char ; ; test for 0 termination of CmdMenu tstfsz cmdTblChar ; skip if 0 at end of CmdMenu was read goto NotCmdZ ; otherwise not at end goto UnCmd ; end of format strings with no match NotCmdZ ; if here valid format string char is available ; ; test for format string indicating cmd termination by carriage return movlw 0x0D ; load CR character cpfseq cmdTblChar ; skip if carriage return is indicated goto NotCmdC ; otherwise not a carriage return cpfseq INDF0 ; skip if cmd char is CR goto SkpCmd ; CR not found, advance past this menu cmd ; cmd has been matched with format string, execute function btfsc cmdFlags, CmdByte ; if last table byte read was lo then skip tablrd 0, 1, cmdTblChar ; otherwise update TABLAT and skip 0 pad ; init output buffer to cause u1: to display new prompt after cmd movlw cmdOutBuff ; load start of output buffer movwf FSR1 ; into FSR1 movlw 'u' ; load ascii u movwf INDF1 ; into buffer incf FSR1 ; point to next location movlw '1' ; load ascii 1 movwf INDF1 ; into buffer incf FSR1 ; point to next location movlw ':' ; load ascii : movwf INDF1 ; into buffer incf FSR1 ; point to next location movlw '\n' ; load ascii LF movwf INDF1 ; into buffer movpf FSR1, cmdOutPtr ; save current location in output pointer incf FSR1 ; point to next location movlw '\r' ; load ascii CR into last location in buff movwf INDF1 ; CR terminates cmd line when resubmited ; fetch command function address pointer from CmdMenu table and vector tlrd 1, PCLATH ; fetch upper byte of pointer into PCLATH tlrd 0, PCL ; fetch lower byte into PCL causing jump NotCmdC ; if here format string char is not a carriage return ; ; test for format string indicating string parameter movlw 's' ; load string parameter indicating char cpfseq cmdTblChar ; skip if string parameter indicated goto NotPrmS ; otherwise not a string parameter movlw 0x0D ; load CR character into W NxtPrmS movfp INDF0, INDF1 ; move char from cmd into parameter cpfseq INDF1 ; skip if last parameter is CR goto PrmSc ; CR not found, copy next char ; CR has terminated string parameter copy clrf INDF1 ; replace CR with 0 termination incf FSR1 ; point to next parameter addr goto RdTbl ; evaluate next format string char PrmSc ; prepare to copy next char incf FSR0 ; point to next cmd char incf FSR1 ; point to next parameter addr goto NxtPrmS ; copy next char NotPrmS ; if here format string char does not indicate a string parameter ; ; test for format string indicating decimal parameter movlw 'n' ; load decimal parameter indicating char cpfseq cmdTblChar ; skip if decimal parameter indicated goto NotPrmN ; otherwise not a decimal parameter clrf cmdPrmC ; clear parameter digit count clrf INDF1 ; init current parameter GetPrmN movlw '0'-1 ; load ascii 0 - 1 cpfsgt INDF0 ; skip if cmd char is >= ascii 0 goto EndPrmN ; otherwise determine if param was read movlw '9'+1 ; load ascii 9 + 1 cpfslt INDF0 ; skip if cmd char is <= ascii 9 goto EndPrmN ; otherwise determine if param was read ; cmd char is a valid decimal digit incf cmdPrmC ; increment parameter digit count movlw 10 ; load 10 mulwf INDF1 ; multiply by current parameter value movfp PRODL, INDF1 ; update current parameter with x10 value movlw 0x0F ; load lower nibble mask andwf INDF0, W ; mask new cmd param digit into W addwf INDF1 ; add to current parameter incf FSR0 ; point to next cmd char goto GetPrmN ; see if still a parameter digit EndPrmN ; current cmd char is not a decimal digit tstfsz cmdPrmC ; if param digit count is zero then skip goto $+2 ; param was read, move to next cmd char goto SkpCmd ; nothing read, advance past this menu cmd incf FSR1 ; point to next parameter addr goto RdTbl ; evaluate next format string char NotPrmN ; if here format string char does not indicate a decimal parameter ; ; test for format string indicating hexidecimal parameter movlw 'x' ; load hexidecimal param indicating char cpfseq cmdTblChar ; skip if hexidecimal parameter indicated goto NotPrmX ; otherwise not a hexidecimal parameter clrf cmdPrmC ; clear parameter digit count clrf INDF1 ; init current parameter GetPrmX movlw '0'-1 ; load ascii 0 - 1 cpfsgt INDF0 ; skip if cmd char is >= ascii 0 goto EndPrmX ; otherwise determine if param was read movlw '9'+1 ; load ascii 9 + 1 cpfslt INDF0 ; skip if cmd char is <= ascii 9 goto PrmXA ; otherwise check for upper case alpha movlw 0x0F ; load lower nibble mask andwf INDF0, W ; mask new cmd param digit into W goto VldPrmX ; char is a valid hexidecimal digit PrmXA movlw 'A'-1 ; load ascii A - 1 cpfsgt INDF0 ; skip if cmd char is >= ascii A goto EndPrmX ; otherwise determine if param was read movlw 'F'+1 ; load ascii F + 1 cpfslt INDF0 ; skip if cmd char is <= ascii F goto PrmXa ; otherwise check for lower case alpha movlw 0x0F ; load lower nibble mask andwf INDF0, W ; mask new cmd param digit into W addlw 9 ; adjust to correct numeric value goto VldPrmX ; char is a valid hexidecimal digit PrmXa movlw 'a'-1 ; load ascii a - 1 cpfsgt INDF0 ; skip if cmd char is >= ascii a goto EndPrmX ; otherwise determine if param was read movlw 'f'+1 ; load ascii f + 1 cpfslt INDF0 ; skip if cmd char is <= ascii f goto EndPrmX ; otherwise determine if param was read movlw 0x0F ; load lower nibble mask andwf INDF0, W ; mask new cmd param digit into W addlw 9 ; adjust to correct numeric value ; fall through to valid hexidecimal digit VldPrmX ; valid hexidecimal value is in W incf cmdPrmC ; increment parameter digit count bcf INDF1, 7 ; clear upper nibble bcf INDF1, 6 bcf INDF1, 5 bcf INDF1, 4 swapf INDF1 ; multiply current parameter value by 16 addwf INDF1 ; add new value to current parameter incf FSR0 ; point to next cmd char goto GetPrmX ; see if still a parameter digit EndPrmX ; current cmd char is not a hexidecimal digit tstfsz cmdPrmC ; if param digit count is zero then skip goto $+2 ; param was read, move to next cmd char goto SkpCmd ; nothing read, advance past this menu cmd incf FSR1 ; point to next parameter addr goto RdTbl ; evaluate next format string char NotPrmX ; if here format string char does not indicate a decimal parameter ; ; test for alphabetic format string char, automatically capitalize cmd movlw 'A'-1 ; load ascii A - 1 cpfsgt cmdTblChar ; skip if format string char is >= A goto NotCmdA ; otherwise not an alphabetic char movlw 'Z'+1 ; load an ascii Z + 1 cpfslt cmdTblChar ; skip if format string char <= Z goto NotCmdA ; otherwise not an alphabetic char movfp INDF0, WREG ; alphabetic, load cmd char into W bcf WREG, 5 ; capitalize cmd buffer char cpfseq cmdTblChar ; skip if cmd char equals format string goto SkpCmd ; no match, advance past this menu cmd ; current cmd char matches alphabetic format string char incf FSR0 ; point to next cmd char goto RdTbl ; evaluate next format string char NotCmdA ; if here format string char is not alphabetic ; ; char is not alphabetic, parametric or CR so cmd must match exactly movfp INDF0, WREG ; load cmd char into W cpfseq cmdTblChar ; skip if cmd char equals format string goto SkpCmd ; no match, advance past this menu cmd ; current cmd char matches format string char incf FSR0 ; point to next cmd char goto RdTbl ; evaluate next format string char ; SkpCmd ; cmd line does not match, advance to next format string ; test for format string indicating cmd termination by carriage return movlw 0x0D ; load CR character call Adv2Mch ; adv thru format string until CR is found ; current format string char is CR btfsc cmdFlags, CmdByte ; if last table byte read was lo then skip tablrd 0, 1, cmdTblChar ; otherwise update TABLAT and skip 0 pad tablrd 0, 1, WREG ; flush cmd pointer from TABLAT ; cmd function pointer is flushed, TABLAT contains start of description tlrd 1, cmdTblChar ; read first byte of command description bsf cmdFlags, CmdByte ; set flag to cause lo byte read first movlw 0x0A ; load LF character call Adv2Mch ; adv thru descrip string until LF is found ; current desription string char is LF btfsc cmdFlags, CmdByte ; if last table byte read was lo then skip tablrd 0, 1, cmdTblChar ; otherwise update TABLAT and skip 0 pad bcf cmdFlags, CmdByte ; clear flag to cause hi byte read first movfp cmdBuffPtr, FSR0 ; reload cmd buffer addr into FSR0 movlw cmdPrmBuff ; reload start of parameter buffer movwf FSR1 ; into FSR1 goto RdTbl ; analyze new format string ; Adv2Mch ; advance thru table entry until char in W is found cpfseq cmdTblChar ; skip if carriage return is indicated goto $+2 ; otherwise get next table character return ; if CR then return btfss cmdFlags, CmdByte ; if last table byte read was hi then skip tlrd 1, cmdTblChar ; otherwise fetch upper byte btfsc cmdFlags, CmdByte ; if last table byte read was lo then skip tablrd 0, 1, cmdTblChar ; otherwise fetch lower byte btg cmdFlags, CmdByte ; toggle bit indicating hi or lo byte read goto Adv2Mch ; check new format string char for match ; UnCmd ; end of format string entries was reached without matching the cmd movlw cmdOutBuff ; load start of output buffer movwf cmdOutPtr ; into output pointer ; copy result string into output buffer using FSR0 CpyTbl2Out UnCmdD ; copy in unknown command string return ; return from Cmd ; This is the end of the functions executable code ; ; These data statements store constant ascii output strings in program ; memory. They're accessed using the CpyTbl2Out macro. UnCmdD ; constant string for unknown command data "u1:\nUnknown Command\n\r",0 ; ;********************************************************************** ; Location of lookup table defining all commands available to Cmd org 0x1000 ; hardcode table start address to 1000 hex ;********************************************************************** CmdMenu ; Cmd line menu ;********************************************************************** ; ; All cmd format strings, descriptions and the jumps to the associated ; functions are installed here via directives at the beginning of each ; command functions source file. The following directives are used: ; ; CmdPC = $ ; save current inline assembly PC value ; org CurCmdMenuAdr ; set assembly PC to addr for new entry ; data "CmdFormatString", CmdPC, "CmdDescription" ; CmdMenu table entry ; CurCmdMenuAdr = $ ; set current CmdMenu addr for next entry ; org CmdPC ; begin function code gen at inline address ; ; CmdFormatString - format string defining syntax of command ; CmdDescription - string with < 40 char description of command ; ; CurCmdMenuAdr, the current entry address as each entry is added to ; the table, is initialized to CmdMenu, the beginning of the table, ; early in this file before the command source files are included. ; ; When MPASM assembles the source the first org statement causes the ; strings and function pointer to be placed in the CmdMenu lookup ; table after any previously installed commands, The second org ; returns to the previous program memory address for generation of ; command functions executable code. ; The data statement that defines each entry includes a cmd format ; string, a cmd function pointer and a command description string. ; These three items together comprise one entry in the cmd menu table ; which defines all of the commands available to the cmd processor. ; The table is terminated by a 0 were a format string should start. ; This 0 is added by a data staement following these comments. ; Each format string is comprised of the characters of the cmd, all ; in upper case, and the input parameters of the function indicated ; by the lower case n, x, and s characters. An n indicates a decimal ; integer 0-255, x indicates a hexidecimal integer from 0-FF, and s ; indicates a string parameter comprised of all the remaininng ; characters from the cmd line and a 0 termination. ; The decimal and hex input parameters are converted by Cmd from ascii ; text in the cmd line input buffer into numerical values in the ; parameter buffer were they are available to the command function. ; The format string in each CmdMenu table entry is terminated by a \r ; carriage return character and is automatically padded by MPASM to ; fill whole words. Care must be taken in the ordering of entries ; since some input parameters are supersets of others. ; ; These directives must be used immediately following the label at ; the beginning of the cmd function and prior to any executable code. ; They allow installation at assembly time of an entry into the ; CmdMenu lookup table from any source code location. This permits ; source code for the function, which is executed when the command is ; matched; the format string that the command processor matches the ; command against; and a string describing the command, to all be ; in one source location. Therfore addition of commands to the ; command processor is modular with all necessary source located in ; one file together. Therefore no changes are required to the central ; command processor source code other than including the command file. ; ; Examples of the use of these directives and of receiving input ; parameters from the cmdPrmBuff and generating output strings into ; the cmdOutBuff are given in "stdcmd.asm" the command definition file ; for standard PICos commands. ; ; Add terminating 0 to end of entire command list org CurCmdMenuAdr ; set assembly PC to addr for new entry data 0 ; add table terminating zero ; ;********************************************************************** ; Note: this macro doesn't work since no space or \ are allowed in text ; substitution and are required as part of the format string. ;********************************************************************** InstallCmd macro CmdFormatString, CmdDescription CmdPC = $ ; save current inline assembly PC value org CurCmdMenuAdr ; set assembly PC to addr for new entry data "CmdFormatString", CmdPC, "CmdDescription" ; CmdMenu table entry CurCmdMenuAdr = $ ; set current CmdMenu addr for next entry data 0 ; add table terminating zero org CmdPC ; begin cmd code gen at inline address endm ; end of cmd install macro end ; MPASM stops assembling here

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