231a-ag Lab6
Contents
Lab 6
Assembly Part on the PC
Outputting Information
LedOn
You are going to create a program called ledOn that turns on the LED connected to Pin 13.
;;; ____ _
;;; | _ \ __ _| |_ __ _
;;; | | | |/ _` | __/ _` |
;;; | |_| | (_| | || (_| |
;;; |____/ \__,_|\__\__,_|
;;;
section .data
errorMsg db "Error accessing file!",0x0a, 0
errorMsg1 db "Error opening file!",0x0a, 0
usb db "/dev/ttyUSB0",0
handle dd 0
noRead dd 0
msg db "w d 13 1", 0x0d
msgLen equ $-msg
section .bss
%assign MAXBUF 100
buffer resb MAXBUF
;;; ____ _
;;; / ___|___ __| | ___
;;; | | / _ \ / _` |/ _ \
;;; | |__| (_) | (_| | __/
;;; \____\___/ \__,_|\___|
;;;
section .text
global asm_main
asm_main:
;;; open file, write string, close file...
mov ebx, usb
call openFile
mov dword[handle], eax
mov ebx, [handle]
mov ecx, msg
mov edx, msgLen
call writeFile
mov ebx, dword[handle]
call closeFile
;;; we're done!
exit:
mov eax,EXIT
mov ebx,0
int 0x80 ; final system call
Does the LED on Pin 13 turn ON? (If your Pin 13 is damaged from previous labs, please put a resistor plus LED connected to Pin 11).
- Yes, the LED on Pin 13 turns on.
LedOff
Make a copy of ledOn.asm under the name ledOff.asm, modify it, and compile it. Use it to turn OFF the LED.
;;; ____ _
;;; | _ \ __ _| |_ __ _
;;; | | | |/ _` | __/ _` |
;;; | |_| | (_| | || (_| |
;;; |____/ \__,_|\__\__,_|
;;;
section .data
errorMsg db "Error accessing file!",0x0a, 0
errorMsg1 db "Error opening file!",0x0a, 0
usb db "/dev/ttyUSB0",0
handle dd 0
noRead dd 0
msg db "w d 13 0", 0x0d
msgLen equ $-msg
section .bss
%assign MAXBUF 100
buffer resb MAXBUF
;;; ____ _
;;; / ___|___ __| | ___
;;; | | / _ \ / _` |/ _ \
;;; | |__| (_) | (_| | __/
;;; \____\___/ \__,_|\___|
;;;
section .text
global asm_main
asm_main:
;;; open file, write string, close file...
mov ebx, usb
call openFile
mov dword[handle], eax
mov ebx, [handle]
mov ecx, msg
mov edx, msgLen
call writeFile
mov ebx, dword[handle]
call closeFile
;;; we're done!
exit:
mov eax,EXIT
mov ebx,0
int 0x80 ; final system call
LedOnOff
Same scenario, but now this time make your assembly program send an ON message, followed by an OFF message in an endless loop.
;;; ____ _
;;; | _ \ __ _| |_ __ _
;;; | | | |/ _` | __/ _` |
;;; | |_| | (_| | || (_| |
;;; |____/ \__,_|\__\__,_|
;;;
section .data
errorMsg db "Error accessing file!",0x0a, 0
errorMsg1 db "Error opening file!",0x0a, 0
usb db "/dev/ttyUSB0",0
handle dd 0
noRead dd 0
msg db "w d 13 1", 0x0d
msgLen equ $-msg
msg2 db "w d 13 0", 0x0d
msg2Len equ $-msg2
section .bss
%assign MAXBUF 100
buffer resb MAXBUF
;;; ____ _
;;; / ___|___ __| | ___
;;; | | / _ \ / _` |/ _ \
;;; | |__| (_) | (_| | __/
;;; \____\___/ \__,_|\___|
;;;
section .text
global asm_main
asm_main:
;;; open file, write string, close file...
forl33t:
mov ebx, usb
call openFile
mov dword[handle], eax
mov ebx, [handle]
mov ecx, msg
mov edx, msgLen
call writeFile
mov ebx, dword[handle]
call closeFile
call delayhappy
mov ebx, usb
call openFile
mov dword[handle], eax
mov ebx, [handle]
mov ecx, msg2
mov edx, msg2Len
call writeFile
mov ebx, dword[handle]
call closeFile
call delayhappy
jmp forl33t
delayhappy:
mov ecx,0
delayloop:
loop delayloop
ret
Measure the frequency of the LED turning ON and OFF. This will give us an idea of how fast we can activate devices attached to the Arduino.
