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91 lines
1.6 KiB
Plaintext
91 lines
1.6 KiB
Plaintext
#if not(NES)
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#warn nes_hardware module should be only used on NES/Famicom targets
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#endif
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byte ppu_ctrl @$2000
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byte ppu_mask @$2001
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byte ppu_status @$2002
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byte oam_addr @$2003
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byte oam_data @$2004
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byte ppu_scroll @$2005
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byte ppu_addr @$2006
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byte ppu_data @$2007
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byte oam_dma @$4014
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// TODO: better names
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byte apu_pulse1_ctrl @$4000
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byte apu_pulse1_sweep @$4001
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word apu_pulse1_period @$4002
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byte apu_pulse2_ctrl @$4004
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byte apu_pulse2_sweep @$4005
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word apu_pulse2_period @$4006
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byte apu_triangle_unmute @$4008
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word apu_triangle_period @$400A
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byte apu_noise_ctrl @$400C
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byte apu_noise_period @$400E
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byte apu_dmc_ctrl @$4010
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byte apu_dmc_load @$4011
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byte apu_dmc_sample_addr @$4012
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byte apu_dmc_sample_length @$4013
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byte apu_status @$4015
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byte apu_frame_counter @$4017
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byte joypad1_ctrl @$4016
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byte joypad2_ctrl @$4017
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inline asm byte strobe_joypad() {
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? LDA #1
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STA joypad1_ctrl
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LSR
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STA joypad1_ctrl
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? RTS
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}
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inline asm byte read_joypad1() {
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LDA joypad1_ctrl
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? RTS
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}
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inline asm byte read_joypad2() {
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LDA joypad2_ctrl
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? RTS
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}
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macro asm void simulate_reset() {
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JMP (reset_vector.addr)
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}
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inline asm void ppu_set_addr(word ax) {
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STX ppu_addr
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STA ppu_addr
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?RTS
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}
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inline asm byte read_ppu_status() {
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LDA ppu_status
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? RTS
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}
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inline asm void ppu_set_scroll(word a, word x) {
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STA ppu_scroll
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STX ppu_scroll
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?RTS
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}
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inline asm void ppu_write_data(byte a) {
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STA ppu_data
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?RTS
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}
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inline asm void ppu_oam_dma_write(byte a) {
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STA oam_dma
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?RTS
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}
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