ECTE333汇编代码合集

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Lab1-b
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;
; Lab1-b assembler program
;
.include "m8515def.inc"  ; include the ATMEGA8515(L) definitions file
.org $000
rjmp RESET
.org $007  ; set start address to Timer 0 overflow 
rjmp ISRTIME  ; jump if timer0 overflows
.def outval = r16  ; labelling regisers
.def temp = r17  ;
.def counter = r18  ;
RESET:
; Initialise the stack pointer (standard method)
ldi temp,low(RAMEND)  ; lower half
out SPL,temp 
ldi temp,high(RAMEND)  ; upper half
out SPH,temp
; set up portb
ser temp
out DDRB, temp  ; set all pins of PORTB as outputs
ldi outval, 0xAA  ; set to zero
out PORTB, outval  ; output to port B
; initialize timer 0
ldi temp, 0x05 
out TCCR0, temp  ; set timer 0 prescaling to lowest /1024
clr temp  ; clear all bits
out TCNT0, temp  ; clear the timer
; setup timer 0's overflow interrupt
in temp, TIMSK  ; load Timer Interrupt Mask Register
sbr temp, 1<<TOIE0  ; set the timer 0 overflow interrupt enable bit
out TIMSK, temp  ; save Timer Interrupt Mask Register
ldi counter, 0x04
sei  ; enable interrupts
LOOP:
; do nothing, just loop forever(waiting for timer0 overflow)
rjmp LOOP
ISRTIME:
; interrupt service routine
; is executed every 2^16 pre-scaled cycles
dec counter
cpi counter, 0x00
brne BACK
com outval ; Toggle ODD and EVEN Pins
out PORTB, outval  ; output to port B
ldi  counter, 0x04
BACK:
reti  ; return from interrupt (different to normal return)
andi
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;
;  assembler program
;
.include "m8515def.inc"  ; include the ATMEGA8515(L) definitions file
; Some register definitions, using meaningful names
.def BCD1 = r16  ; define register to store the first BCD value
.def BCD2 = r17  ; define register to store the second BCD value
.def temp = r18  ; use this register to store temporary values
; Define a label "reset". Jump here if you want to reset the program
RESET:
; Setup PORTA as an input and PORTB and PORTC as outputs.
ldi temp, 0b11111111
out DDRB, temp ; set all pins of PORTB as outputs
out DDRC, temp ; set all pins of PORTC as outputs
ldi temp, 0b00000000
out DDRA, temp ; set all pins of PORTA as inputs
LOOP:
; Now we continuously run the program in a loop
in temp, PINA ; Read the pin values of PORTA into register
; Extract BCD1 value (bits 0-3)
com temp  ; Invert the bits for use on hardware
mov BCD1, temp ; Copy the value of temp into BCD1
andi BCD1, 0b00001111 ; Mask off the least-significant 4 bits
; Extract BCD2 value (bits 4-7)
mov BCD2, temp ; Copy the value of temp into BCD2
andi BCD2, 0b11110000 ; Mask off the most-significant 4 bits
swap BCD2  ; Swap the nibbles so that the 4 bits
; are in the correct position
; Add values and output to PORTB
mov temp, BCD1 ; temp = BCD1
add temp, BCD2 ; temp = temp + BCD2
com temp  ; Invert the bits for use on hardware
out PORTB, temp  ; Write the result of addition to PORTB
; Multiply values and output to PORTC
mov temp, BCD1 ; temp = BCD1
mul temp, BCD2 ; r1,r0 = temp * BCD2
mov temp, r0  ; r0 lower byte (small numbers)
com temp  ; Invert the bits for use on hardware
out PORTC, temp  ; Write the result of the multiply to PORTC
rjmp LOOP  ; Jump back to start
; END of code
不改变register 写入mem[]
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;
; 基本操作
;
.include "m8515def.inc" ; include the 8515 definition file
.def 	temp = r16 ; define temporary registers
.def 	temp2= r17
.def 	temp3= r18
.def 	temp4= r19
.def 	temp5= r20
.def 	temp6= r21
.def 	temp7= r22
ldi 	temp, 0b00000100 ;赋初始值
ldi 	temp2, 0b00001001  
ldi     temp3, 0b00000000
ldi     temp4, 0b00000000
ldi     temp5, 0b00000001
ldi     temp6, 0b11111111
ldi     temp7, 0b00000000

sts		0x0060, temp    ;Mem[0x0060]
sts 	0x0061, temp2   ;Mem[0x0061]

; additional operations
add     temp3, temp     ;连加处理add指令
add     temp3, temp2    ;add    no carry
sts     0x0062, temp3   ;adc    carry

add     temp4, temp     ;unsigned and overflow
sub     temp4, temp2
sts     0x0063, temp4


mul     temp5, temp    ;
mul     temp5, temp2
sts     0x0064, temp5

and     temp6, temp    ;logic and
and     temp6, temp2
sts     0x0065, temp6

or      temp7, temp    ;logic or
or      temp7,temp2
sts     0x0066, temp7

Q:What values do you expect to be stored in each of registers r18 through r22 for the first program?
• Did you obtain your expected values?
• Why were the registers used, starting from r16?
• Which instructions limit the use of the destination register?
• Was there any Carry, Negative or Overflow issues observed in the operations?
• Where were these reflected?
• In Task 3, what instructions were used to skip over the unneeded branches of the code?

read in from pins store to memory
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;
; Lecture 3 example assembler program
;
.include "m8515def.inc" ; include the 8515 definition file
.def temp = r16  ; define temporary registers
.def temp2 = r17
;
; this is an example code for lecture 3
;
RESET:
; Set the Data Direction Register (DDRA)
; (0's = inputs, 1's = outputs)
ldi  temp, 0x00
out  DDRA, temp
; read in from PortA pins store to memory location 0x0200
in  temp, PINA
sts  0x0200, temp
; read in from PortA pins store to memory location 0x0201
in  temp2, PINA
sts  0x0201, temp
; add values together and store to location 0x0202
add  temp, temp2
sts  0x0202, temp
; load an immediate value and store to location 0x0203
ldi  temp, 0x54
sts  0x0203, temp
; load another immediate value and store to location 0x0204
ldi  temp, 0xF0
sts  0x0204, temp
; subtract an immediate value and store to location 0x0205
subi  temp, 0x31
sts  0x0205, temp
LOOP:
; Continually loop doing nothing
rjmp  LOOP  ; jump back to LOOP
if
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.include "m8515def.inc" ; include the 8515 definition file
.def temp = r16  ; define temporary registers
.def temp2 = r17
;
ldi temp, 0x00    ;PINA input , PINB output
out DDRA, temp
ldi temp, 0xFF
out DDRB, temp
;                  
int main(void) {  ;不知道正确性
for(::)
{
in temp, PINA 
if( r16==1 )
ldi temp2, 0b00000101
else if(r16==2)
ldi temp2, 0b00000110
else if(r16==3)
ldi temp2, 0b00000111
else 
ldi temp2, 0b00001000
out temp2,PINB
}
}