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228 lines
4.0 KiB
228 lines
4.0 KiB
; Zapojeni (Připojen DMC-50399 v 4-bitovem modu):
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; +------u------+
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; Vcc -> reset --+ /RST Vcc +-- napajeni +5V
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; --+ PD0 PB7 +-- RS (0=instr W, BF+addr R; 1=data W/R)
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; --+ PD1 PB6 +-- R/W (1=read,0=write)
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; --+ PA1 PB5 +-- E (strobe)
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; --+ PA0 PB4 +--
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; --+ PD2 PB3 +-- DATA 7
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; --+ PD3 PB2 +-- DATA 6
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; --+ PD4 PB1 +-- DATA 5
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; --+ PD5 PB0 +-- DATA 4
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; GND --+ GND PD6 +--
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; +-------------+
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;DMC-50399:
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; 1 - GND
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; 2 - +5V
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; 3 - 0V (lcd driver)
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; 4 - RS
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; 5 - R/W
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; 6 - E
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; 7 - DATA 0
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; 8 - DATA 1
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;...
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;14 - DATA 7
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.device attiny2313
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;běží na 4MHz, ckdiv8=1 (vypnuto)
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;250x16=1ms=1000us
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;LFUSE: 0xE2
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;HFUSE: 0xDF
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;K O N S T A N T Y + P R E Z D I V K Y P O U R T U A P I N U
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;PORTB
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.equ LCDPORT = PORTB
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.equ LCDPIN = PINB
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.equ LCDDDR = DDRB
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.equ RS = 7
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.equ RW = 6
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.equ E = 5
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.equ LCD_CLEAR = 0b00000001
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.equ LCD_HOME = 0b00000010
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.equ LCD_MODE_INC_NOSH = 0b00000110
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.equ LCD_MODE_INC_SH = 0b00000111
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.equ LCD_MODE_DEC_NOSH = 0b00000100
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.equ LCD_MODE_DEC_SH = 0b00000101
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.equ LCD_DISPLAY_DISABLED = 0b00001000
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.equ LCD_DISPLAY_NOCURSOR = 0b00001100
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.equ LCD_DISPLAY_CURSOR = 0b00001110
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.equ LCD_DISPLAY_BLINK = 0b00001101
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.equ LCD_DISPLAY_ALTER = 0b00001111
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;4bit,5x7,2line
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.equ LCD_MODE_4BIT = 0b00101000
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.equ LCD_MODE_8BIT = 0b00111000
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.equ ROW1_ADDR = 0x00
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.equ ROW2_ADDR = 0x40
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;aliasy pointerů
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.def ZH = r31
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.def ZL = r30
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.def YH = r29
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.def YL = r28
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.def XH = r27
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.def XL = r26
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; Z A C A T E K P R O G R A M U
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;vektory preruseni
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.org 0x0000 ;RESET
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rjmp RESET ;skok na start po resetu
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.org 0x0013
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;nastaveni po resetu
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.DB "DMC-50399 TEST" ;(nazev programu)
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RESET:
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ldi r16,low(RAMEND) ;nastavi stack pointer
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out SPL,r16
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cli ;zakazat vsechna preruseni
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; Nastaveni portu
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;PORTB = LCDPORT
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ldi r16,0b11111111 ;smer portu B
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out LCDDDR,r16
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ldi r16,0b00000000 ;vypnout B
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out LCDPORT,r16
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sei ;Global Interrupt Enable
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rcall LCD_INIT
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ldi r17,LCD_DISPLAY_DISABLED
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rcall TX_INSTR
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ldi r17,ROW1_ADDR
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rcall DDRAM_SET_ADDR
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ldi ZH,high(ROW1*2)
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ldi ZL,low(ROW1*2)
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read1: lpm r17,Z+
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cpi r17,0
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breq text2
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rcall TX_DATA
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rjmp read1
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text2:
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ldi r17,ROW2_ADDR
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rcall DDRAM_SET_ADDR
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ldi ZH,high(ROW2*2)
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ldi ZL,low(ROW2*2)
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read2: lpm r17,Z+
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cpi r17,0
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breq loop
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rcall TX_DATA
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rjmp read2
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ldi r17,LCD_DISPLAY_CURSOR
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rcall TX_INSTR
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loop: rjmp loop
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;r16=počet ms (cca)
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delay:
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push r17 ;2
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push r18 ;2
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d1:
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ldi r17,250 ;1
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d2:
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ldi r18,14 ;1
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d3:
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dec r18 ;1
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nop
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brne d3 ;2 (1
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dec r17 ; +1)
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brne d2 ;2 (1
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dec r16 ; +1)
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brne d1 ;2 (1)
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pop r18 ;2
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pop r17 ;2
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ret
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LCD_INIT:
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ldi r16,16
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rcall delay
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ldi r16,0b00000010 ;4bit
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out PORTB,r16
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rcall LCD_CLK
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ldi r16,5
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rcall delay
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ldi r17,LCD_MODE_4BIT
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rcall TX_INSTR
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ldi r17,LCD_MODE_INC_NOSH
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rcall TX_INSTR
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ret
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;r17
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TX_INSTR:
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swap r17
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mov r16,r17
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andi r16,0b00001111
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out LCDPORT,r16
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rcall LCD_CLK
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swap r17
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mov r16,r17
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andi r16,0b00001111
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out LCDPORT,r16
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rcall LCD_CLK
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ret
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;r17
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TX_DATA:
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swap r17
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mov r16,r17
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andi r16,0b00001111
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sbr r16,0b10000000
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out LCDPORT,r16
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rcall LCD_CLK
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swap r17
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mov r16,r17
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andi r16,0b00001111
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sbr r16,0b10000000
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out LCDPORT,r16
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rcall LCD_CLK
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ret
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LCD_CLK:
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sbi LCDPORT,E
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nop
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nop
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nop
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cbi LCDPORT,E
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ldi r16,100 ;100 funguje na 4MHZ
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clkw1:
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dec r16
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brne clkw1
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; ldi r16,1
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; rcall delay
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ret
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;7 bitu (1.radek zacina 00,druhej 40)
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DDRAM_SET_ADDR:
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clr r16
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sbr r16,0b10000000
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or r17,r16
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rcall TX_INSTR
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ret
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;6 bitu (5,4,3 = znak, 2,1,0 = radek - shora)
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CGRAM_SET_ADDR:
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clr r16
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sbr r16,0b01000000
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or r17,r16
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rcall TX_INSTR
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ret
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ROW1:
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.DB "ATTINY2313 & HD44780",0
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ROW2:
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.DB "* www.ondrovo.com *",0
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