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185 lines
6.8 KiB
Plaintext
185 lines
6.8 KiB
Plaintext
TITLE "Clock module name - (REL clock name here)"
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SUBTTL "Description of Clock Module"
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;================================================================
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; Place brief description and machine clock I/O parameters here
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; along with any version and date data
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;================================================================
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VERS EQU 01
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.Z80
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NAME CCLOK ; Change this to no more than 6-char
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; name for the REL driver module
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MACLIB CLOCK.LIB ; Some useful equates are here
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; This first section contains identification information for the driver
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; The information is not placed in the clock driver code section, but are
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; located in a different area located by the _CLKID Named Common directive.
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COMMON /_CLKID/
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DESCST: DEFW 0000 ; Add label here if a static year byte
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; is used by your clock driver. The
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; label should point to the year byte
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CLKNAM: DEFB 'Myclock ' ; Exactly 24 chars in name
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DEFB VERS/10+'0','.',VERS MOD 10 +'0',0
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DESCR: DEFB ' This description may be longer than the brief',CR,LF
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DEFB ' name string above, and must be null-terminated',0
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IF [$-DESCST] > 256
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OVER2 ; This must be less than or equal to 256 bytes
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ENDIF
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PAGE
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SUBTTL "Configurable Clock Hardware Parameters"
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;---------------------------------------------------------------------
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; This section contains any configurable parameters needed for the
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; clock driver. They must be structured in the manner shown in order
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; for the loader to properly match and set the values.
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; The values in this section are not loaded in the same code section
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; as the actual driver code, but are located in another base referenced
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; by the _PARM_ Named Common directive.
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COMMON /_PARM_/
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PARBAS: DEFW NPARAMS ; # of parameters (Set to 00 if none)
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DEFW STRS ; Pointer to STRS (Set to 00 if none)
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NP0:
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XYR EQU $+1
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DEFB BYTE ; EXAMPLE! - This shows a byte value
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DEFW 88H ; " - ..and default value in Set
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XPORT EQU $+1
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DEFB WORD ; EXAMPLE! - This shows a 16-bit value
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DEFW 0F013H ; " - ..and default value in Set
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NPARAMS EQU ($-NP0)/3
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STRS: DEFB 'Default Year',0 ; EXAMPLE! - Text prompt for XYR
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DEFB 'Default Port',0 ; EXAMPLE! - Text prompt for XPORT
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PAGE
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SUBTTL "Clock Code - SB180 HeartBeat"
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;------------------------------------------------------------------
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; This section should contain the actual Clock Driver code, and all
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; entries here are located in the CSEG, or Code Segment.
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CSEG
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; Add any needed equates here if they are not included in CLOCK.LIB
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TIMOFF EQU 36H ; EXAMPLE! - Bios offset for clock ptr
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;-----------------------------------------------------------
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; Z S D O S C L O C K H E A D E R
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;-----------------------------------------------------------
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; Enter: HL points to a 6-byte buffer to Get/Set time
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; Exit : A=1 on Success, A=FFH if error
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; HL points to last char in buffer
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; NOTE: If clock Set is not included, comment these two jumps
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; out to save a few bytes. The loader, SETUPZST, uses
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; these two jumps to recognize a full ZSDOS clock and
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; modify the interface code.
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PRGBAS: JP GETTIM ; Jump to Read Clock
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JP WRCLK ; Jump to Set Clock
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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; R e a d T h e C l o c k
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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; Clock READ code starts here.
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GETTIM: ; The work of reading the clock
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; goes here. Values needing to be set
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; during installation are referenced as:
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;YPORT1 EQU $+1
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; LD BC,0000 ; EXAMPLE! - this will set a 16-bit value
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; ; in the configuration process
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;YYR EQU $+1 ; EXAMPLE! - This will set an 8-bit value
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; LD A,00 ; in the configuration process
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; ... Place the meat of the driver in this section ...
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OKRET: LD A,01 ; Set OK status return
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RET
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ERRET: OR 0FFH ; Set Error code if needed
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RET
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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; S e t T h e C l o c k
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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; Clock Set code placed here if needed. If Clock Setting
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; is not being added, comment out this section to save a
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; byte of code.
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WRCLK:
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RET
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PAGE
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SUBTTL "Run-Time Configuration of Ports and Masks"
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;-------------------------------------------------------------
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; This code installs configurable items into the clock module
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; Enter with DE pointing to the physical base address of the
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; relocatable module. DE MUST BE USED TO SET VALUES IN
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; THE CSEG PORTION OF CODE!
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; NOTE: Code in this section is not added to the actual clock
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; driver, but placed in a different area referenced to
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; the common base _POST_.
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COMMON /_POST_/
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; Values in the _PARM_, _POST_ and _PRE_ sections may be loaded
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; and saved directly, since their addresses are constant from
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; linkage through execution. Setting or reading values in the
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; CSEG must be indirect based on the value in the DE register
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; pair. The following examples show how to access the various
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; sections.
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;
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; LD A,(XYR) ; EXAMPLE - Get byte from _PARM_ directly
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; LD HL,YYR ; " - Begin offset into CSEG indirectly
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; ADD HL,DE ; " - HL now addresses relocated loc'n
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; LD (HL),A ; " - ..so value can be stored
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;
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; Likewise, 16-bit values must be accessed indirectly, and may use
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; the BC register pair as transfer storage.
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;
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; LD BC,(XPORT) ; EXAMPLE - Get word from _PARM_ directly
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; LD HL,YPORT1 ; " - Begin offset into CSEG indirectly
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; ADD HL,DE ; " - HL now addresses relocated loc'n
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; LD (HL),C ; " - ..so value can be saved..
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; INC HL ; " - ...a byte..
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; LD (HL),B ; " - ....at a time..
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;
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; LD (YPORT2),BC ; EXAMPLE - Values can be stored directly into
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; " - other sections such as _PRE_
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RET ; This RETURN MUST be present even if no other
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; code is included in this section
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PAGE
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SUBTTL "Pre-Execution Clock Checks (Check for ticking)"
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;----------------------------------------------------------------
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; This module is executed just prior to installing the module to
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; insure that a valid clock is present
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; Enter with DE pointing to base of relocated clock code segment
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COMMON /_PRE_/
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; Optional final setup of the clock module may go here. Examples of such
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; code would be installation-dependant items such as physical RAM location
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; for the driver module. If any code is added here, the DE register pair
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; MUST be preserved to properly inter PRECLOCK code (If included).
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;YPORT2 EQU $+1 ; EXAMPLE - just to show accessing method
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; LD BC,0000 ; " - ..from _POST_ code.
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INCLUDE PRECLOCK.LIB ; This section of code merely calls the
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; clock and waits an arbitrary period of
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; time (>> 1 second) to see if the time
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; changes. It returns an error if not.
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END
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