101 lines
2.3 KiB
Text
101 lines
2.3 KiB
Text
//-----------------------------------------------------------
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// SCRIPT LIBRARY and SCRIPT MACRO Demo
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// Demonstrates reusable Starlark functions and macros
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//-----------------------------------------------------------
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#INCLUDE <c64start.c65>
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GOTO start
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//-----------------------------------------------------------
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// SCRIPT LIBRARY: Define reusable code generation functions
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//-----------------------------------------------------------
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SCRIPT LIBRARY
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def emit_nops(count):
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for i in range(count):
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print(" nop")
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def emit_delay(cycles):
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# 4 cycles per iteration (2x nop)
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for i in range(cycles // 4):
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print(" nop")
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print(" nop")
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remainder = cycles % 4
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if remainder >= 3:
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print(" bit $ea")
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remainder -= 3
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# 2 cycles per nop
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for i in range(remainder // 2):
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print(" nop")
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def emit_border_flash(color1, color2):
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print(" lda #%d" % color1)
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print(" sta $d020")
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print(" lda #%d" % color2)
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print(" sta $d020")
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ENDSCRIPT
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//-----------------------------------------------------------
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// SCRIPT MACRO: Named macros with parameters
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//-----------------------------------------------------------
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SCRIPT MACRO delay(cycles)
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emit_delay(cycles)
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ENDSCRIPT
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SCRIPT MACRO nops(count)
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emit_nops(count)
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ENDSCRIPT
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SCRIPT MACRO border_flash(c1, c2)
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emit_border_flash(c1, c2)
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ENDSCRIPT
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// Macro with label parameter (passed as string)
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SCRIPT MACRO set_irq(handler)
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print(" lda #<%s" % handler)
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print(" sta $fffe")
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print(" lda #>%s" % handler)
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print(" sta $ffff")
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ENDSCRIPT
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//-----------------------------------------------------------
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// Constants for testing expression evaluation
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//-----------------------------------------------------------
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BYTE CONST CYCLES_PER_LINE = 63
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BYTE CONST RED = 2
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BYTE CONST BLUE = 6
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//-----------------------------------------------------------
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// Main code demonstrating macros
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//-----------------------------------------------------------
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LABEL start
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// Macro invocation outside ASM block
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@delay(10)
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@nops(3)
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@border_flash(RED, BLUE)
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// Macro with expression argument
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@delay(CYCLES_PER_LINE-20)
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// Macro with label argument
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@set_irq(my_handler)
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// Macro invocation inside ASM block
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ASM
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lda #$00
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|@delay(8)|
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sta $d020
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|@nops(2)|
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lda #$01
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ENDASM
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SUBEND
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LABEL my_handler
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ASM
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pha
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inc $d020
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pla
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rti
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ENDASM
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