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https://github.com/KarolS/millfork.git
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47 lines
945 B
Plaintext
47 lines
945 B
Plaintext
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#if not(GAMEBOY)
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#warn gb_joy module should be only used on NES/Famicom targets
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#endif
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import gb_hardware
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#pragma zilog_syntax
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// standard joystick driver for Game Boy
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import joy
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alias input_a = input_btn
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byte input_b
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byte input_select
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byte input_start
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void read_joy() {
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byte tmp
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reg_joypad = $20
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asm {
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ld a,(reg_joypad)
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ld a,(reg_joypad)
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ld a,(reg_joypad)
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ld a,(reg_joypad)
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}
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tmp = reg_joypad
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input_dx = 0
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input_dy = 0
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if tmp & 1 == 0 { input_dx += 1 }
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if tmp & 2 == 0 { input_dx -= 1 }
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if tmp & 4 == 0 { input_dy -= 1 }
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if tmp & 8 == 0 { input_dy += 1 }
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reg_joypad = $10
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asm {
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ld a,(reg_joypad)
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ld a,(reg_joypad)
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ld a,(reg_joypad)
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ld a,(reg_joypad)
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}
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byte tmp
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tmp = reg_joypad ^ $ff
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input_a = (tmp & 1) >> 0
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input_b = (tmp & 2) >> 1
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input_select = (tmp & 4) >> 2
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input_start = (tmp & 8) >> 3
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}
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