penguin86/pato-z80-home-computer
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WIP Monitor

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Daniele Verducci (ZenPenguin) 2020-11-25 08:53:41 +01:00
parent 4d74b03e3f
commit 3d7610e113
2 changed files with 65 additions and 14 deletions
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1
assembly/bios/main.asm
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@ -48,6 +48,7 @@ SYSINIT_GREETING:
;include 'driver_hd44780.asm' ;include 'driver_hd44780.asm'
;include 'driver_keyboard.asm' ;include 'driver_keyboard.asm'
include 'driver_arduino_terminal.asm' include 'driver_arduino_terminal.asm'
include 'monitor.asm'
; SYSTEM CALLS ; SYSTEM CALLS
; User I/O ; User I/O

76
assembly/bios/monitor.asm
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@ -2,25 +2,75 @@
; @author Daniele Verducci ; @author Daniele Verducci
; ;
; Monitor commands (CMD $arg): ; Monitor commands (CMD $arg):
; DMP $pos Dumps first 100 bytes of memory starting at $pos ; H (HELP) Shows available commands
; SET $pos $val Replaces byte at $pos with $val ; D (DUMP) $pos Dumps first 100 bytes of memory starting at $pos
; LOA $pos $val Loads all the incoming bytes in memory starting from $pos ; S (SET) $pos $val Replaces byte at $pos with $val
; RUN $pos Starts executing code from $pos ; L (LOAD) $pos $val Loads all the incoming bytes in memory starting from $pos
; R (RUN) $pos Starts executing code from $pos
; The commands are entered with a single letter and the program completes the command
; CONSTANTS ; CONSTANTS
; All monitor commands are 3 chars long. ; All monitor commands are 3 chars long.
MON_COMMAND_DMP: DB "DMP",0 ; null terminated strings MON_WELCOME: DB "PAT80 MEmory MOnitor 0.1"
MON_COMMAND_DMP: DB "SET",0 MON_COMMAND_HELP: DB "HELP",0 ; null terminated strings
MON_COMMAND_DMP: DB "LOA",0 MON_COMMAND_DUMP: DB "DUMP",0 ; null terminated strings
MON_COMMAND_DMP: DB "RUN",0 MON_COMMAND_SET: DB "SET",0
MON_COMMAND_LOAD: DB "LOAD",0
MON_COMMAND_RUN: DB "RUN",0
MON_ARG_HEX: DB "0x",0
MON_HELP: DB "Available commands: HELP, DUMP, SET, LOAD, RUN"
Monitor_main: Monitor_main:
; Read from command line ; Print welcome string
ld bc, MON_WELCOME
call Print
monitor_main_loop:
; Draw prompt char
ld a, 62 ; >
call Printc
; Read char from command line
call Readc: ; blocking: returns when a character was read and placed in A reg
; Switch case
cp (MON_COMMAND_HELP) ; check incoming char is equal to command's first char
jp z, monitor_help
cp (MON_COMMAND_DUMP)
jp z, monitor_dump
cp (MON_COMMAND_SET)
jp z, monitor_set
cp (MON_COMMAND_LOAD)
jp z, monitor_load
cp (MON_COMMAND_RUN)
jp z, monitor_run
jp monitor_main_loop
monitor_help:
ld bc, MON_COMMAND_HELP + 1 ; autocomplete command
call Print
ld bc, MON_HELP
call Print
ret ret
; Parses a command monitor_dump:
; TODO: This is not very efficient, should be implemented as a tree, but for few commands is ok... ld bc, MON_COMMAND_DUMP + 1 ; autocomplete command
; return A The interpreted command, or 0 if not found call Print
monitor_parse:
ret ret
monitor_set:
ld bc, MON_COMMAND_SET + 1 ; autocomplete command
call Print
ret
monitor_load:
ld bc, MON_COMMAND_LOAD + 1 ; autocomplete command
call Print
ret
monitor_run:
ld bc, MON_COMMAND_RUN + 1 ; autocomplete command
call Print
jp APP_VAR_SPACE ; Start executing code
ret