; Constants .equ MAX_NUMBER = 59 .equ MIN_NUMBER = 1 ; Define registers or memory locations if needed .include "m8535def.inc" .def temp = r16 .def seed = r17 ; Initialize ports and other necessary settings ; Set up the ports ldi temp, 0xFF out DDRA, temp ; Port A as output out DDRB, temp ; Port B as output ; Seed the initial value ldi seed, $56 ; Initial seed value for random number generation ; Main program main: ldi temp, 6 ; Generate six random numbers generate_numbers: call random_number ; Call subroutine to generate random number ; Display the most significant digit on Port A call display_most_significant_digit ; Show the least significant bits on Port B andi temp, $03 ; Mask the least significant 2 bits out PORTB, temp ; Wait for a short time for visualization (optional) ; Insert your delay routine here ; Decrement the counter and loop dec temp brne generate_numbers ; Infinite loop rjmp main ; Subroutine for generating random numbers using XOR and shift method random_number: ; Load the seed value mov temp, seed ; XOR bottom two bits and shift the result onto the most significant bit lsr temp ror seed bst temp, 0 bld seed, 7 eor seed, temp ; Ensure the generated number falls within the range 01 to 59 ; Mask the number to 6 bits and add 1 to ensure it's within the specified range andi seed, $3F ldi temp, 1 add seed, temp ; Return the random number in temp mov temp, seed ret ; Subroutine to display the most significant digit in binary on Port A display_most_significant_digit: ; Extract the most significant digit mov temp, seed ldi seed, 10 ; Divide by 10 to get the most significant digit div temp, seed mov temp, seed ; Store the most significant digit in temp ; Convert the digit to binary and display on Port A lsr temp ; Shift to extract the digit out PORTA, temp ; Display the most significant digit in binary on Port A ret
Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.
Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.
Every assembler may have it's own assembly language designed for a specific computers or an operating system.
Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.
Assembly language usually consists of three sections,
Data section
To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section
To declare variables
text section
_start specifies the starting of this section where the actually code is written.
There are various define directives to allocate space for variables for both initialized and uninitialized data.
variable-name define-directive initial-value
| Define Directive | Description | Allocated Space |
|---|---|---|
| DB | Define Byte | 1 byte |
| DW | Define Word | 2 bytes |
| DD | Define Doubleword | 4 bytes |
| DQ | Define Quadword | 8 bytes |
| DT | Define Ten Bytes | 10 bytes |
| Define Directive | Description |
|---|---|
| RESB | Reserve a Byte |
| RESW | Reserve a Word |
| RESD | Reserve a Doubleword |
| RESQ | Reserve a Quadword |
| REST | Reserve a Ten Bytes |
Constants can be defined using
CONSTANT_NAME EQU regular-exp or value
%assign constant_name value
%define constant_name value
Loops are used to iterate a set of statements for a specific number of times.
mov ECX,n
L1:
;<loop body>
loop L1
where n specifies the no of times loops should iterate.
Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
procedure_name:
;procedure body
ret