; Made by Sudeep Saurabh DATA SEGMENT PORTA EQU 00H ; define PORTA connection PORTB EQU 02H ; define PORTB connection PORTC EQU 04H ; define PORTC connection PORT_CON EQU 06H ; define PORT_CON connection DATA ENDS CODE SEGMENT MOV AX, DATA MOV DS, AX ; connecting data and code segments ORG 0000H ; set origin value START: MOV DX, PORT_CON MOV AL, 10000010B ; set the control word value OUT DX, AL JMP VAL VAL: ; function for checking input values MOV DX, PORTB IN AL, DX CMP AL, 11100000B JZ S0 IN AL, DX CMP AL, 11010000B JZ S1 IN AL, DX CMP AL, 11110000B JZ S2 IN AL, DX CMP AL, 00100000B JZ S3 IN AL, DX CMP AL, 00110000B JZ S3 IN AL, DX CMP AL, 01100000B JZ S3 IN AL, DX CMP AL, 01110000B JZ S3 IN AL, DX CMP AL, 10100000B JZ S3 IN AL, DX CMP AL, 10110000B JZ S3 IN AL, DX CMP AL, 00000000B JZ S4 IN AL, DX CMP AL, 00010000B JZ S4 IN AL, DX CMP AL, 01000000B JZ S4 IN AL, DX CMP AL, 0101000B JZ S4 IN AL, DX CMP AL, 10000000B JZ S4 IN AL, DX CMP AL, 10010000B JZ S4 IN AL, DX CMP AL, 11000000B JZ S5 JMP VAL S0: ; Funcation about blue+alarm MOV AL, 10100000B MOV DX, PORTA OUT DX, AL JMP VAL S1: ; function about red+alarm MOV AL, 11000000B ; red LED and buzzer on to show seatbelt is not in MOV DX, PORTA OUT DX, AL JMP VAL S2: ; funcation about blue+red+alarm MOV AL, 11100000B ; both LEDs and buzzer off to show pressure sensor is not triggered MOV DX, PORTA OUT DX, AL JMP VAL S3: ; Funcation about blue MOV AL, 00100000B ; both LEDs and buzzer off to show pressure sensor is not triggered MOV DX, PORTA OUT DX, AL JMP VAL S4: ; Nothing MOV AL, 00000000B MOV DX, PORTA OUT DX, AL JMP VAL S5: ; Green Light - GO ahead MOV AL, 00010000B MOV DX, PORTA OUT DX, AL JMP VAL JMP START CODE ENDS END
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