40 lines
631 B
NASM
40 lines
631 B
NASM
;hd44780 lcd test procedure
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LCD_INSTR_REG: EQU %00000000
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LCD_DATA_REG: EQU %00000001
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;reset procedure
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ld a,%00111000
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out (LCD_INSTR_REG),a
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ld a,%00001000
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out (LCD_INSTR_REG),a
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ld a,%00000001
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out (LCD_INSTR_REG),a
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;init procedure
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ld a,%00111000
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out (LCD_INSTR_REG),a
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ld a,%00001110
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out (LCD_INSTR_REG),a
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;write characters to display
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ld a,%01000100
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out (LCD_DATA_REG),a
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ld a,%01100001
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out (LCD_DATA_REG),a
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ld a,%01101110
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out (LCD_DATA_REG),a
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ld a,%01101001
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out (LCD_DATA_REG),a
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ld a,%01100101
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out (LCD_DATA_REG),a
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ld a,%01101100
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out (LCD_DATA_REG),a
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ld a,%01100101
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out (LCD_DATA_REG),a
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ld a,%00100001
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out (LCD_DATA_REG),a
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halt
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