Question

I need to use 8086 assembly language to connect with Arduino in my assignment. When I run the assembly program, the buzzer will sound. I run the assembly program using DOSBox.

int buzzer = 11;
int val;

void setup() {
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  val = Serial.read();
  if(-1 != val) {
    if('H' == val) {
      unsigned char i;
      for(i = 0; i < 80; i++) {
        digitalWrite(buzzer, HIGH);
        delay(1);
        digitalWrite(buzzer, LOW);
        delay(1);
      }
      for(i = 0; i < 100; i++) {
        digitalWrite(buzzer, HIGH);
        delay(2);
        digitalWrite(buzzer, LOW);
        delay(2);
      }
    }
  }
}

Above is my Arduino code. When COM1 receives 'H', the buzzer will sound.

.MODEL SMALL
.STACK 64
.DATA
.CODE
MAIN PROC
        MOV AX,@DATA
        MOV DS,AX
        MOV AH,00
        MOV AL,11101011b
        MOV DX,00
        MOV AH,1
        MOV AL,'H'
        MOV DX,00
        INT 14H
        MOV AX,4C00H
        INT 21H
MAIN ENDP
END MAIN

Above is my assembly code. When I run the assembly code, it is supposed to send 'H' to COM1, and the buzzer will sound. However, nothing happens when I run the assembly program. What is the problem?

Answer 1

MOV AH,00
MOV AL,11101011b
MOV DX,00

此代码正在尝试设置COM1串口：

9600波特
奇数奇偶校验
1站位
8个数据位

但是这里缺少一条关键指令！您仍然需要请求BIOS实际执行它：

int 14h

MAIN PROC
    xor   dx, dx        ; Select COM1
    mov   ah, 00h       ; InitializeCommunicationsPort
    mov   al, 11101011b ; 9600, odd, 1, 8
    int   14h
    mov   ah, 01h       ; WriteCharacterToCommunicationsPort
    mov   al, 'H'
    int   14h
    test  ah, ah
    jns   OK
    ... function failed with errorcode in bits 0-6 of AH
  OK:
    mov   ax, 4C00h     ; TerminateWithReturnCode
    int   21h
MAIN ENDP
END MAIN

Communicate with Arduino using 8086 assembly language

1 个答案: