mirror of https://gitlab.com/camelot/kickc.git
489 lines
11 KiB
NASM
489 lines
11 KiB
NASM
// Test the functionality of the C64 processor port ($00/$01)
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// Tests by setting the value of the processor port - and then printing out values of $00/$01/$a000/$d000/$e000
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// Commodore 64 PRG executable file
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.file [name="processor-port-test.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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/// Mask for PROCESSOR_PORT_DDR which allows only memory configuration to be written
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.const PROCPORT_DDR_MEMORY_MASK = 7
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/// RAM in all three areas 0xA000, 0xD000, 0xE000
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.const PROCPORT_RAM_ALL = 0
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/// RAM in 0xA000, 0xE000 I/O in 0xD000
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.const PROCPORT_RAM_IO = 5
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/// RAM in 0xA000, 0xE000 CHAR ROM in 0xD000
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.const PROCPORT_RAM_CHARROM = 1
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/// RAM in 0xA000, I/O in 0xD000, KERNEL in 0xE000
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.const PROCPORT_KERNEL_IO = 6
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/// BASIC in 0xA000, I/O in 0xD000, KERNEL in 0xE000
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.const PROCPORT_BASIC_KERNEL_IO = 7
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/// Processor port data direction register
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.label PROCPORT_DDR = 0
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/// Processor Port Register controlling RAM/ROM configuration and the datasette
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.label PROCPORT = 1
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.label BASIC_ROM = $a000
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.label KERNAL_ROM = $e000
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.label IO_RAM = $d000
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.label SCREEN = $400
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.label print_screen = $400
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.label print_char_cursor = 2
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.label print_line_cursor = 6
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.segment Code
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main: {
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// asm
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// Avoid interrupts
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sei
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// *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK
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// Write recognizable values into memory
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z PROCPORT_DDR
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// *PROCPORT = PROCPORT_RAM_ALL
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lda #PROCPORT_RAM_ALL
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sta.z PROCPORT
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// *BASIC_ROM = $a0
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lda #$a0
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sta BASIC_ROM
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// *KERNAL_ROM = $e0
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lda #$e0
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sta KERNAL_ROM
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// *IO_RAM = $d0
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lda #$d0
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sta IO_RAM
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// *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z PROCPORT_DDR
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// *PROCPORT = PROCPORT_BASIC_KERNEL_IO
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lda #PROCPORT_BASIC_KERNEL_IO
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sta.z PROCPORT
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// *IO_RAM = $dd
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lda #$dd
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sta IO_RAM
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// print_cls()
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jsr print_cls
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// print_str("ddr port ddr2 $00 $01 $a000 $d000 $e000")
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lda #<print_screen
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sta.z print_char_cursor
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lda #>print_screen
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sta.z print_char_cursor+1
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lda #<str
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sta.z print_str.str
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lda #>str
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sta.z print_str.str+1
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jsr print_str
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// print_ln()
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lda #<print_screen
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sta.z print_line_cursor
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lda #>print_screen
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sta.z print_line_cursor+1
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jsr print_ln
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// testProcport(PROCPORT_DDR_MEMORY_MASK, PROCPORT_RAM_ALL, PROCPORT_DDR_MEMORY_MASK)
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z testProcport.ddr2
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lda #PROCPORT_RAM_ALL
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sta.z testProcport.port
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ldx #PROCPORT_DDR_MEMORY_MASK
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jsr testProcport
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// testProcport(PROCPORT_DDR_MEMORY_MASK, PROCPORT_RAM_IO, PROCPORT_DDR_MEMORY_MASK)
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z testProcport.ddr2
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lda #PROCPORT_RAM_IO
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sta.z testProcport.port
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ldx #PROCPORT_DDR_MEMORY_MASK
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jsr testProcport
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// testProcport(PROCPORT_DDR_MEMORY_MASK, PROCPORT_RAM_CHARROM, PROCPORT_DDR_MEMORY_MASK)
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z testProcport.ddr2
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lda #PROCPORT_RAM_CHARROM
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sta.z testProcport.port
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ldx #PROCPORT_DDR_MEMORY_MASK
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jsr testProcport
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// testProcport(PROCPORT_DDR_MEMORY_MASK, PROCPORT_KERNEL_IO, PROCPORT_DDR_MEMORY_MASK)
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z testProcport.ddr2
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lda #PROCPORT_KERNEL_IO
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sta.z testProcport.port
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ldx #PROCPORT_DDR_MEMORY_MASK
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jsr testProcport
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// testProcport(PROCPORT_DDR_MEMORY_MASK, PROCPORT_BASIC_KERNEL_IO, PROCPORT_DDR_MEMORY_MASK)
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z testProcport.ddr2
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lda #PROCPORT_BASIC_KERNEL_IO
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sta.z testProcport.port
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ldx #PROCPORT_DDR_MEMORY_MASK
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jsr testProcport
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// testProcport($00, $00, $00)
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lda #0
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sta.z testProcport.ddr2
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sta.z testProcport.port
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tax
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jsr testProcport
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// testProcport($ff, $00, $00)
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lda #0
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sta.z testProcport.ddr2
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sta.z testProcport.port
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ldx #$ff
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jsr testProcport
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// testProcport($ff, $ff, $00)
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lda #0
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sta.z testProcport.ddr2
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lda #$ff
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sta.z testProcport.port
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tax
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jsr testProcport
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// testProcport($ff, $00, $ff)
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lda #$ff
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sta.z testProcport.ddr2
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lda #0
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sta.z testProcport.port
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ldx #$ff
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jsr testProcport
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// testProcport($ff, $55, $ff)
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lda #$ff
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sta.z testProcport.ddr2
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lda #$55
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sta.z testProcport.port
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ldx #$ff
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jsr testProcport
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// testProcport($ff, $aa, $ff)
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lda #$ff
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sta.z testProcport.ddr2
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lda #$aa
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sta.z testProcport.port
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ldx #$ff
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jsr testProcport
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// testProcport($ff, $ff, $ff)
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lda #$ff
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sta.z testProcport.ddr2
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sta.z testProcport.port
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tax
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jsr testProcport
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// testProcport($55, $00, $55)
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lda #$55
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sta.z testProcport.ddr2
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lda #0
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sta.z testProcport.port
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ldx #$55
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jsr testProcport
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// testProcport($55, $55, $55)
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lda #$55
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sta.z testProcport.ddr2
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sta.z testProcport.port
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tax
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jsr testProcport
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// testProcport($55, $ff, $55)
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lda #$55
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sta.z testProcport.ddr2
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lda #$ff
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sta.z testProcport.port
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ldx #$55
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jsr testProcport
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// testProcport($aa, $00, $aa)
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lda #$aa
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sta.z testProcport.ddr2
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lda #0
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sta.z testProcport.port
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ldx #$aa
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jsr testProcport
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// testProcport($aa, $ff, $aa)
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lda #$aa
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sta.z testProcport.ddr2
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lda #$ff
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sta.z testProcport.port
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ldx #$aa
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jsr testProcport
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// testProcport($aa, $aa, $aa)
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lda #$aa
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sta.z testProcport.ddr2
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sta.z testProcport.port
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tax
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jsr testProcport
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// testProcport($ff, $d0, $00)
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lda #0
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sta.z testProcport.ddr2
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lda #$d0
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sta.z testProcport.port
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ldx #$ff
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jsr testProcport
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// testProcport($ff, $55, $55)
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lda #$55
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sta.z testProcport.ddr2
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sta.z testProcport.port
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ldx #$ff
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jsr testProcport
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// testProcport($17, $15, $15)
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lda #$15
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sta.z testProcport.ddr2
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sta.z testProcport.port
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ldx #$17
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jsr testProcport
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// testProcport($17, $15, $17)
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lda #$17
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sta.z testProcport.ddr2
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lda #$15
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sta.z testProcport.port
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ldx #$17
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jsr testProcport
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// testProcport($17, $17, $17)
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lda #$17
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sta.z testProcport.ddr2
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sta.z testProcport.port
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tax
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jsr testProcport
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// asm
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// Enable interrupts
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cli
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// *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK
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// Return to normal settings
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lda #PROCPORT_DDR_MEMORY_MASK
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sta.z PROCPORT_DDR
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// *PROCPORT = PROCPORT_BASIC_KERNEL_IO
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lda #PROCPORT_BASIC_KERNEL_IO
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sta.z PROCPORT
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__b1:
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// (*(SCREEN+999))++;
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inc SCREEN+$3e7
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jmp __b1
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.segment Data
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str: .text "ddr port ddr2 $00 $01 $a000 $d000 $e000"
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.byte 0
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}
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.segment Code
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// Clear the screen. Also resets current line/char cursor.
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print_cls: {
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// memset(print_screen, ' ', 1000)
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jsr memset
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// }
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rts
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}
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// Print a zero-terminated string
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// void print_str(__zp(4) char *str)
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print_str: {
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.label str = 4
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__b1:
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// while(*str)
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ldy #0
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lda (str),y
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cmp #0
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bne __b2
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// }
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rts
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__b2:
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// print_char(*(str++))
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ldy #0
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lda (str),y
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jsr print_char
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// print_char(*(str++));
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inc.z str
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bne !+
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inc.z str+1
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!:
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jmp __b1
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}
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// Print a newline
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print_ln: {
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__b1:
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// print_line_cursor + 0x28
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lda #$28
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clc
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adc.z print_line_cursor
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sta.z print_line_cursor
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bcc !+
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inc.z print_line_cursor+1
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!:
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// while (print_line_cursor<print_char_cursor)
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lda.z print_line_cursor+1
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cmp.z print_char_cursor+1
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bcc __b1
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bne !+
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lda.z print_line_cursor
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cmp.z print_char_cursor
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bcc __b1
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!:
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// }
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rts
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}
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// void testProcport(__register(X) char ddr, __zp(8) char port, __zp(9) char ddr2)
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testProcport: {
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.label port = 8
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.label ddr2 = 9
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// *PROCPORT_DDR = $ff
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lda #$ff
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sta.z PROCPORT_DDR
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// *PROCPORT = $00
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lda #0
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sta.z PROCPORT
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// *PROCPORT_DDR = ddr
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stx.z PROCPORT_DDR
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// *PROCPORT = port
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lda.z port
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sta.z PROCPORT
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// *PROCPORT_DDR = ddr2
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lda.z ddr2
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sta.z PROCPORT_DDR
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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// print_str(" ")
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lda #<str
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sta.z print_str.str
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lda #>str
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(ddr)
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jsr print_uchar
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// print_str(" ")
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lda #<str1
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sta.z print_str.str
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lda #>str1
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(port)
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ldx.z port
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jsr print_uchar
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// print_str(" ")
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lda #<str1
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sta.z print_str.str
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lda #>str1
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(ddr2)
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ldx.z ddr2
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jsr print_uchar
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// print_str(" ")
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lda #<str3
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sta.z print_str.str
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lda #>str3
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(*PROCPORT_DDR)
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ldx.z PROCPORT_DDR
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jsr print_uchar
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// print_str(" ")
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lda #<str3
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sta.z print_str.str
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lda #>str3
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(*PROCPORT)
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ldx.z PROCPORT
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jsr print_uchar
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// print_str(" ")
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lda #<str5
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sta.z print_str.str
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lda #>str5
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(*BASIC_ROM)
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ldx BASIC_ROM
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jsr print_uchar
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// print_str(" ")
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lda #<str5
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sta.z print_str.str
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lda #>str5
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(*IO_RAM)
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ldx IO_RAM
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jsr print_uchar
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// print_str(" ")
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lda #<str5
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sta.z print_str.str
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lda #>str5
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sta.z print_str.str+1
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jsr print_str
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// print_uchar(*KERNAL_ROM)
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ldx KERNAL_ROM
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jsr print_uchar
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// print_ln()
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jsr print_ln
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// }
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rts
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.segment Data
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str: .text " "
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.byte 0
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str1: .text " "
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.byte 0
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str3: .text " "
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.byte 0
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str5: .text " "
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.byte 0
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}
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.segment Code
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// Copies the character c (an unsigned char) to the first num characters of the object pointed to by the argument str.
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// void * memset(void *str, char c, unsigned int num)
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memset: {
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.const c = ' '
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.const num = $3e8
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.label str = print_screen
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.label end = str+num
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.label dst = 4
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lda #<str
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sta.z dst
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lda #>str
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sta.z dst+1
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__b1:
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// for(char* dst = str; dst!=end; dst++)
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lda.z dst+1
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cmp #>end
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bne __b2
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lda.z dst
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cmp #<end
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bne __b2
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// }
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rts
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__b2:
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// *dst = c
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lda #c
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ldy #0
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sta (dst),y
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// for(char* dst = str; dst!=end; dst++)
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inc.z dst
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bne !+
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inc.z dst+1
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!:
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jmp __b1
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}
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// Print a single char
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// void print_char(__register(A) char ch)
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print_char: {
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// *(print_char_cursor++) = ch
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ldy #0
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sta (print_char_cursor),y
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// *(print_char_cursor++) = ch;
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inc.z print_char_cursor
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bne !+
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inc.z print_char_cursor+1
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!:
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// }
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rts
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}
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// Print a char as HEX
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// void print_uchar(__register(X) char b)
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print_uchar: {
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// b>>4
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txa
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lsr
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lsr
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lsr
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lsr
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// print_char(print_hextab[b>>4])
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tay
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lda print_hextab,y
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// Table of hexadecimal digits
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jsr print_char
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// b&0xf
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lda #$f
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axs #0
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// print_char(print_hextab[b&0xf])
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lda print_hextab,x
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jsr print_char
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// }
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rts
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}
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.segment Data
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print_hextab: .text "0123456789abcdef"
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