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https://github.com/safiire/n65.git
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Updates to the assembler's output concerning the sizes of banks, how much are used, a --quiet option was added, and a -s option to produce a symbol map.
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Safiire
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182
examples/scales.asm
Normal file
182
examples/scales.asm
Normal file
@ -0,0 +1,182 @@
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.ines {"prog": 1, "char": 0, "mapper": 0, "mirror": 0}
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.inc <nes.sym>
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.segment prog 0
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;; SRAM Variables
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.org $0000
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.scope audio
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.space timer 1
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.space next_note 1
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.space note_frequency 2
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.
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;; Interrupt vectors
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.org $FFFA
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.dw vblank
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.dw main
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.dw irq
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.org $C000
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.scope main
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sei
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cld
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;; Setup the stack
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ldx #$ff
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txs
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;; Disable rendering, reset APU
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ldx #$00
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stx nes.ppu.control
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stx nes.ppu.mask
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jsr zero_apu
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.scope
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wait_vblank:
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bit nes.ppu.status
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bpl wait_vblank
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.
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clear_ram:
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lda #$00
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sta $00, x
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sta $100, x
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sta $300, x
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sta $400, x
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sta $500, x
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sta $600, x
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sta $700, x
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lda #$ff
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sta $200, x
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inx
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bne clear_ram
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.scope
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wait_vblank:
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bit nes.ppu.status
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bpl wait_vblank
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.
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jsr initialize
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forever:
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jmp forever
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rti
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.
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;; Zero the APU
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.scope zero_apu
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lda #$00
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ldx #$00
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loop:
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sta $4000, x
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inx
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cpx $18
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bne loop
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rts
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.
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;; Initialize PPU and APU
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.scope initialize
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lda #%00000011
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sta nes.apu.channel_enable
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; Reenable interrupts, Turn Vblank back on
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lda #%10000000
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sta nes.ppu.control
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; Initialize the audio structure
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lda #$00
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sta audio.timer zp
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lda #$30
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sta audio.next_note zp
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cli
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rts
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.
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;; Keep time via 60fps vblank
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.scope vblank
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; Update the audio timer so it resets every 64 frames
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ldx audio.timer zp
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inx
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txa
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and #%00000011
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sta audio.timer zp
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bne return
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; Play the next note on reset
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lda audio.next_note zp
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cmp #$80
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bmi continue
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lda #$30
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continue:
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jsr play_note
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sta audio.next_note zp
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inc audio.next_note zp
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return:
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rti
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.
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;; Hi and lo byte tables for note frequencies
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.scope midi_notes
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.scope hi
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.bytes $35, $32, $2f, $2c, $2a, $28, $25, $23, $21, $1f, $1d, $1c, $1a, $19, $17, $16
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.bytes $15, $14, $12, $11, $10, $0f, $0e, $0e, $0d, $0c, $0b, $0b, $0a, $0a, $09, $08
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.bytes $08, $07, $07, $07, $06, $06, $05, $05, $05, $05, $04, $04, $04, $03, $03, $03
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.bytes $03, $03, $02, $02, $02, $02, $02, $02, $02, $01, $01, $01, $01, $01, $01, $01
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.bytes $01, $01, $01, $01, $01, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
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.bytes $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
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.bytes $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
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.bytes $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
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.
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.scope lo
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.bytes $71, $71, $9c, $f0, $6a, $09, $ca, $ab, $aa, $c6, $fe, $4f, $b8, $38, $ce, $78
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.bytes $35, $04, $e4, $d5, $d5, $e3, $fe, $27, $5b, $9c, $e6, $3b, $9a, $01, $72, $ea
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.bytes $6a, $f1, $7f, $13, $ad, $4d, $f3, $9d, $4c, $00, $b8, $74, $34, $f8, $bf, $89
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.bytes $56, $26, $f9, $ce, $a6, $80, $5c, $3a, $1a, $fb, $df, $c4, $ab, $93, $7c, $67
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.bytes $52, $3f, $2d, $1c, $0c, $fd, $ef, $e1, $d5, $c9, $bd, $b3, $a9, $9f, $96, $8e
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.bytes $86, $7e, $77, $70, $6a, $64, $5e, $59, $54, $4f, $4b, $46, $42, $3f, $3b, $38
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.bytes $34, $31, $2f, $2c, $29, $27, $25, $23, $21, $1f, $1d, $1b, $1a, $18, $17, $15
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.bytes $14, $13, $12, $11, $10, $0f, $0e, $0d, $0c, $0c, $0b, $0a, $0a, $09, $08, $08
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.
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.
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;; Play midi note held in A
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.scope play_note
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pha
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tax
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lda #%10011111
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sta nes.apu.pulse1.control
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; Get the low byte of the timer
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ldy midi_notes.lo, x
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sty nes.apu.pulse1.ft
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sty audio.note_frequency+1 zp
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; Get the high 3 bits of the timer
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ldy midi_notes.hi, x
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tya
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and #%00000111
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ora #%11111000
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sta nes.apu.pulse1.ct
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sta audio.note_frequency zp
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pla
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rts
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.
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;; IRQ, we are not using
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.scope irq
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rti
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.
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62
lib/n65.rb
62
lib/n65.rb
@ -18,13 +18,14 @@ module N65
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####
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## Assemble from an asm file to a nes ROM
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def self.from_file(infile, outfile)
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def self.from_file(infile, options)
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fail(FileNotFound, infile) unless File.exists?(infile)
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assembler = self.new
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program = File.read(infile)
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output_file = options[:output_file]
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puts "Building #{infile}"
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puts "Building #{infile}" unless options[:quiet]
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## Process each line in the file
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program.split(/\n/).each_with_index do |line, line_number|
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begin
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@ -33,28 +34,35 @@ module N65
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STDERR.puts("\n\n#{e.class}\n#{line}\n#{e}\nOn line #{line_number}")
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exit(1)
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end
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print '.'
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print '.' unless options[:quiet]
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end
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puts
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puts unless options[:quiet]
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## Second pass to resolve any missing symbols.
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print "Second pass, resolving symbols..."
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print "Second pass, resolving symbols..." unless options[:quiet]
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assembler.fulfill_promises
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puts " Done."
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puts " Done." unless options[:quiet]
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## Let's not export the symbol table to a file anymore
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## Will add an option for this later.
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#print "Writing symbol table to #{outfile}.yaml..."
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#File.open("#{outfile}.yaml", 'w') do |fp|
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#fp.write(assembler.symbol_table.export_to_yaml)
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#end
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#puts "Done."
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if options[:write_symbol_table]
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print "Writing symbol table to #{output_file}.yaml..." unless options[:quiet]
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File.open("#{output_file}.yaml", 'w') do |fp|
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fp.write(assembler.symbol_table.export_to_yaml)
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end
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puts "Done." unless options[:quiet]
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end
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## Emit the complete binary ROM
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File.open(outfile, 'w') do |fp|
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fp.write(assembler.emit_binary_rom)
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rom = assembler.emit_binary_rom
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File.open(output_file, 'w') do |fp|
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fp.write(rom)
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end
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unless options[:quiet]
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rom_size = rom.size
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rom_size_hex = "%x" % rom_size
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assembler.print_bank_usage
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puts "Total size: $#{rom_size_hex}, #{rom_size} bytes"
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end
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puts "All Done :)"
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end
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@ -190,15 +198,11 @@ module N65
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def emit_binary_rom
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progs = @virtual_memory[:prog]
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chars = @virtual_memory[:char]
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puts "iNES Header"
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puts "+ #{progs.size} PROG ROM bank#{progs.size != 1 ? 's' : ''}"
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puts "+ #{chars.size} CHAR ROM bank#{chars.size != 1 ? 's' : ''}"
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rom_size = 0x10
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rom_size += MemorySpace::BankSizes[:prog] * progs.size
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rom_size += MemorySpace::BankSizes[:char] * chars.size
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puts "= Output ROM will be #{rom_size} bytes"
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rom = MemorySpace.new(rom_size, :rom)
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offset = 0x0
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@ -215,6 +219,24 @@ module N65
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end
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####
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## Display information about the bank sizes and total usage
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def print_bank_usage
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puts
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puts "ROM Structure {"
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puts " iNES 1.0 Header: $10 bytes"
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@virtual_memory[:prog].each_with_index do |prog_rom, bank_number|
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puts " PROG ROM bank #{bank_number}: #{prog_rom.usage_info}"
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end
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@virtual_memory[:char].each_with_index do |char_rom, bank_number|
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puts " CHAR ROM bank #{bank_number}: #{char_rom.usage_info}"
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end
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puts "}"
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end
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private
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@ -11,7 +11,7 @@ module N65
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####
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## Initialize with ARGV commandline
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def initialize(argv)
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@options = {:output_file => nil}
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@options = {output_file: nil, write_symbol_table: false, quiet: false}
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@argv = argv.dup
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end
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@ -31,7 +31,7 @@ module N65
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## Only can assemble one file at once for now
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if @argv.size != 1
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STDERR.puts "Can only assemble one input file at once :("
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STDERR.puts "Can only assemble one input file at once, but you can use .inc and .incbin directives"
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exit(1)
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end
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@ -54,7 +54,7 @@ module N65
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exit(1)
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end
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N65::Assembler.from_file(input_file, @options[:output_file])
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N65::Assembler.from_file(input_file, @options)
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end
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private
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@ -69,12 +69,19 @@ module N65
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@options[:output_file] = output_file;
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end
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opts.on('-s', '--symbols', 'Outputs a symbol map') do
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@options[:write_symbol_table] = true
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end
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opts.on('-q', '--quiet', 'No output on success') do
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@options[:quiet] = true
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end
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opts.on('-v', '--version', 'Displays Version') do
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puts "N65 Assembler Version #{N65::VERSION}"
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exit
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end
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opts.on('-h', '--help', 'Displays Help') do
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puts opts
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exit
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@ -48,6 +48,7 @@ module N65
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def initialize(size, type)
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@type = type
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@memory = Array.new(size, 0x0)
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@bytes_written = 0
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end
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@ -71,6 +72,7 @@ module N65
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bytes.each_with_index do |byte, index|
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@memory[from_normalized + index] = byte
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@bytes_written += 1
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end
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bytes.size
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end
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@ -83,6 +85,17 @@ module N65
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end
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####
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## Bank Usage information
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def usage_info
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percent_used = @bytes_written / @memory.size.to_f * 100
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percent_string = "%0.2f" % percent_used
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bytes_written_hex = "$%04x" % @bytes_written
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memory_size_hex = "$%04x" % @memory.size
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"(#{bytes_written_hex} / #{memory_size_hex}) #{percent_string}%"
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end
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private
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####
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@ -1,3 +1,3 @@
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module N65
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VERSION ||= "1.5.0"
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VERSION ||= "1.5.2"
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end
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