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hd44780 display debugger

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Daniele Verducci su MatissePenguin
2020-10-18 14:47:46 +02:00
parent 63974b148c
commit c833911cad
6 changed files with 61 additions and 18 deletions
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7
assembly/README.txt Normal file
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Compilare assembly:
z80asm -i hd44780_lcd_test_procedure.asm -o rom.bin
Portare binario alla dimensione dell eeprom:
dd if=/dev/zero of=rom.bin bs=1 count=0 seek=8192
Scrivere su EEPROM:
minipro -w rom.bin -p "AT28C64B"

BIN
assembly/a.bin
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Binary file not shown.

31
assembly/hd44780_lcd_test_procedure.asm
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;hd44780 lcd test procedure
ld hl,$4000 ;address reg points to lcd instruction address
LCD_INSTR_REG: EQU %00000000
LCD_DATA_REG: EQU %00000001
;reset procedure
ld a,%00111000
ld (hl),a
out (LCD_INSTR_REG),a
ld a,%00001000
ld (hl),a
out (LCD_INSTR_REG),a
ld a,%00000001
ld (hl),a
out (LCD_INSTR_REG),a
;init procedure
ld a,%00111000
ld (hl),a
out (LCD_INSTR_REG),a
ld a,%00001110
ld (hl),a
out (LCD_INSTR_REG),a
;write characters to display
ld hl,$4001 ;address reg points to lcd data address
ld a,%01000100
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01100001
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01101110
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01101001
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01100101
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01101100
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01100101
ld (hl),a
out (LCD_DATA_REG),a
ld a,%00100001
ld (hl),a
out (LCD_DATA_REG),a
halt