ProcessorsTechnik Labor LCD-Uhr

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1 ProcessorsTechnik Labor LCD-Uhr Xu,Zhen

2 Aufgabe Beschreibung:LCD-Uhr HardWare :LCD161A. (4B.8B Dataverarbeiten ). Clock Chip:KS0066U Programmieren Sprache :Assemble LCD1602 PIN definieren :

3 Pin Funktionen 4 RS Input Register 1:Data,0:Instruktion 5 R/W Input Write.Read 1:Read,0:Write 6 E Input Funktion Signal. Signal truth table: RS R/W E Funktion 0 0 Fallenden Flanke Write Instruction Code 0 1 Hoch Read Busy und AC Code 1 0 Fallenden Flanke Write Data 1 1 Hoch Read Data Programme:.include "m8def.inc" ; LCDUHR ZEIGEN.def = r16.def 2 = r17.def temp1 = r18.def SubCount = r21.def Sekunden = r22.def Minuten = r23.def Stunden = r24 ; Define generic port names (change the 'A' to whatever you're using).equ LCD_PORT = PORTD.equ LCD_DDR = DDRD.equ LCD_PIN = PIND ; Define the pin numbers.equ LCD_E = 1.equ LCD_RW = 2.equ LCD_RS = 3.def DelayTime = r20.equ DelayCount1 = 128 ; LCDUHR ROUTINES ; Frequenz ist 4 MHz. ; LCD Zeigt so darunter ; AVR LCD ; 0 --> no connection ; 1 --> Enable on LCD ; 2 --> R/W on LCD ; 3 --> RS on LCD ; 4 --> Data4

4 ; 5 --> Data5 ; 6 --> Data6 ; 7 --> Data7 ; ; *** LCD_Init: Routine to initialize the LCD. LCD_Init: push ldi DelayTime, 255 ; Put the LCD in 8-bit mode. Even though we want the display to ; operate in 4-bit mode, the only way to guarantee that our commands ; are aligned properly is to initialize in 8-bit. ldi, 0b out LCD_PORT, rcall LCD_PulseE rcall DELAY rcall DELAY ; Now it's safe to go into 4-bit mode. ldi, 0b out LCD_PORT, rcall LCD_PulseE rcall DELAY rcall DELAY ; *** Send the 'FUNCTION SET' command ; Data: 0 = 4-bit; 1 = 8-bit ; Lines: 0 = 1; 1 = 2 ; Font: 0 = 5x8; 1 = 5x11 ldi, 0b ; *** Send the 'CURSOR/DISPLAY SHIFT' command ; S/C: 0 = cursor; 1 = display ; R/L: 0 = left; 1 = right ldi, 0b ; *** Send the 'DISPLAY ON/OFF' command ; Display: 0 = off; 1 = on ; +--- Cursor: 0 = off; 1 = on ; +-- Blink: 0 = off; 1 = on ldi, 0b ; *** Send the 'ENTRY MODE' command ; +--- Direction: 0 = left; 1 = right ; +-- Shift Dislay: 0 = off; 1 = on ldi, 0b rcall pop LCD_Clear ; *** LCD_PrintMem: Prints from memory. ; Put the starting memory location in Z (r31:r30) ; Put the number of characters to print in 2 ; After execution, Z is at the character AFTER the last to be printed

5 ; and 2 is zero. ; This function will not wrap if you the string is bigger than the LCD. LCD_PrintMem: push LCD_MemRead: ld, Z+ dec 2 brne LCD_MemRead pop ; *** LCD_PrintPM: Prints from program memory LCD_PrintPM: push r0 push LCD_PMRead: lpm mov, r0 adiw r30, 1 dec 2 brne LCD_PMRead pop pop r0 ; *** LCD_Clear: Clears the display and sends the cursor home. LCD_Clear: push ; *** Clear the display ldi, 0b ; *** Send the cursor home ldi, 0b pop ; *** LCD_SendCmd: Routine to write a command to the instruction register. ; The value to be written should be stored in. ; The value is sent 4 bits at a time. LCD_SendCmd: push push 2 rcall LCD_WaitBusy mov 2, ; Make a backup copy andi 2, 0b ; Only use the upper nibble out LCD_PORT, 2 ; Send it rcall LCD_PulseE ; Pulse the enable swap ; Swap upper/lower nibble andi, 0b ; Only use the upper nibble out LCD_PORT, ; Send it rcall LCD_PulseE ; Pulse the enable pop 2 pop

6 ; *** LCD_SendChar: Routine to write a character to the data register. ; The value to be written should be stored in. ; The value is sent 4 bits at a time. LCD_SendChar: push push 2 mov 2, ; Make a backup copy rcall LCD_WaitBusy mov, 2 ; Make a backup copy andi 2, 0b ; Only use the upper nibble ori 2, 0b out LCD_PORT, 2 ; Send it rcall LCD_PulseE ; Pulse the enable swap ; Swap upper/lower nibble andi, 0b ; Only use the upper nibble ori, 0b out LCD_PORT, ; Send it rcall LCD_PulseE ; Pulse the enable pop pop 2 ; *** LCD_WaitBusy: Wait for the busy flag to go low. ; Waits for the busy flag to go low. Since we're in 4-bit mode, ; the register has to be read twice (for a total of 8 bits). The ; second read is never used. ; If you need more code space, this function could be replaced with ; a simple delay. LCD_WaitBusy: push ldi, 0b ; Disable data bit outputs out LCD_DDR, ldi, 0x00 ; Clear all outputs out LCD_PORT, LCDWaitLoop: ldi, 0b ; Enable only read bit out LCD_PORT, sbi LCD_PORT, LCD_E ; Raise the Enable signal. nop nop in, LCD_PIN ; Read the current values cbi LCD_PORT, LCD_E ; Disable the enable signal. rcall LCD_PulseE ; Pulse the enable (the second nibble is discarded) sbrc, 7 ; Check busy flag rjmp LCDWaitLoop ldi, 0b ; Enable all outputs out LCD_DDR, pop LCD_PulseE: sbi LCD_PORT, LCD_E nop nop cbi LCD_PORT, LCD_E

7 ; *** Provide millisecond delay (DelayTicks specifies number of ms) DELAY: push DelayTime push r25 ldi r25, DelayCount1 DELAY1: dec r25 brne DELAY1 dec DelayTime brne DELAY1 pop r25 pop DelayTime rjmp RESET pause: sbiw ZL,1 brne pause ;Den Registern ZL:ZH r17 abziehen.. ZL ist gross ;ZL bei 0? nein? dann zu Pause... RESET: ldi, low(ramend) out SPL, ldi, high(ramend) out SPH, temp ; Initialize Stackpointer ldi, 0x00 out LCD_PORT, ; Clear the outputs ldi, 0xFF out LCD_DDR, ; Set the direction to output ldi DelayTime, 255 ; Set the default delay length ; (see my delay.asm) rcall rcall LCD_Init DELAY ldi, 'T' rcall pause rcall pause rcall LCD_Clear ;//////////////////////////////////////////////////// ; Haupt programm ;//////////////////////////////////////////////////// main: ldi temp1, 0b ; Teiler 1024 out TCCR0, temp1 ldi temp1, 0b ; TOIE0: Interrupt bei Timer Overflow out TIMSK, temp1 clr Minuten ; Die Uhr auf 0 setzen clr Sekunden

8 clr Stunden clr SubCount sei loop: rjmp loop timer0_overflow: ; Timer 0 Overflow Handler inc SubCount ; Wenn dies nicht der 15. Interrupt cpi SubCount, 15 ; ist, dann passiert gar nichts brne end_isr clr SubCount inc Sekunden ; 1 Sekunde registrieren cpi Sekunden, 60 ; sind 60 Sekunden vergangen? brne Ausgabe ; wenn nicht kann die Ausgabe schon ; gemacht werden clr Sekunden ; Sekunden wieder auf 0 und dafür inc Minuten ; 1 Minute registrieren cpi Minuten, 60 ; sind 60 Minuten vergangen? brne Ausgabe ; wenn nicht, -> Ausgabe clr Minuten ; Minuten zurücksetzen und dafür inc Stunden ; 1 Stunde registrieren cpi Stunden, 24 ; nach 24 Stunden, die Stundenanzeige brne Ausgabe ; wieder zurücksetzen clr Stunden Ausgabe: rcall LCD_Clear ; das LCD löschen mov temp1, Stunden ; und die Stunden ausgeben ldi temp1, ':' ; zwischen Stunden und Minuten einen ':' mov temp1, Minuten ; dann die Minuten ausgeben ldi temp1, ':' ; und noch ein ':' mov temp1, Sekunden ; und die Sekunden end_isr: i ; das wars. Interrupt ist fertig