http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2009-01-07T22:27:33-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Hello,I have to finish and make a report about the project below in a week.My problem is: I dont have hardware part now and i m wondering how to simulate my assembly program in any sofware. I m used to simuate in Proteus Isis. But i dont know how to build the circuit with RS232 in ISIS. Can anybody help me?Thanks in advance! an Assembly Language Program to control a DC Motor interfaced to a PC through the parallel port. The project contains the following modules:1. Motor Driving Module (Output Module):· The motor will rotate clockwise if f (forward) key is pressed and will rotate anticlockwise if r (reverse) key is pressed.· The speed of the motor will be changed by introducing different PWM signals with changing duty cycles.2. Speed Display Module (Output Module):· The speed of rotating motor will be indicated by displaying a single digit 7-segment display. There will be speeds from 0 to 9. The speed which is displayed on the 7-segment display will also be displayed on the monitor with its direction (clockwise or anticlockwise).· The positive speeds will be shown as they are (from 0 to 8) and the negative speeds will be displayed in two’s complement form.3. Up and Down Push Buttons (Input Module):· The speed of the motor will be controlled by the two external push buttons (Up and Down) connected to the PC through the parallel port. The speed will be incremented or decremented one by one by pushing to Up or Down buttons respectively. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 u can use virtual terminal in instruments section or COMPIM (in devices) to simulate serial port. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez Yeah I know this. Thanks.But i couldnt do it properly. Can you give me a link? or maybe a tutorial working properly.I m not sure with my problem. It may be because of ports http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 i dont have any tutorial or link . but if u tell what problem you are facing we can solve it http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez If it is possible, can you make a little circuit working properly, that includes rs232 is connected to 1 led and i can test it by using "out #,data" command.You may send to my emai: mpguybrush@yahoo.com or upload anywhere and everybody can see it in the future. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay There is no need of using COMPIM. Just make circuit on proteus.. with DC motor connected.. and make use of virtual terminal provided in the proteus.For driving a DC motor.. you need a H-Bridge circuit commonly available as L293D IC. But simulation of this IC is not available so make use of transistor based H-bridge.. you can take a look at the sample circuit from the DC Motor tutorial.. BJT based H-Bridge demo is given...Just make the simulation circuit... and it will work perfectly. if you feel any problem i am here.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 and tell me if u want to simulate L293D i have its simulation model http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay wow... mail me.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 try if it works in this wayL293D Spice model The content of the post is hidden!Please Login to see the hidden post.If you are new to the website Please Signup! http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay I want to put it in the download section.. so asking you if its working or not..can you give me a screenshot of it? i am not on my PC hence no softwares.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 then put this.how to use l293d on proteushttp://rapidshare.com/files/81973769/using_l293d.zip http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay you gave him the code? lol! http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay no problem.. do not remove it now.. just let him take it as a reference.. ok! anyways thank you for the model..Just wanted to ask. is it ok to host Proteus spice model file on server? http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 oho http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 i dont think that there will be any problem http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez Thanks a lot! http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay no there wont be.. he still has to do the major parts.. hope he come back and see what is going on http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay is this model a custom made? or what? http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 abbas1707 Ajay wrote ...no there wont be.. he still has to do the major parts.. hope he come back and see what is going on lol i was talking about placing proteus model on server.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez Hi, I came back again Thanks for explaining me how to simulate the circuit but i have to write the program. I wish i could write in C, unfortunately i have to write it in asm, even in tasm. So i dont have much time and i cant find sources. You helped me a lot but please if you can show me how to finish this, i will be very grateful.I dont know how to write those functions for key_pressed situation.And another question, should i use a pic to get the data from parallel port and from push buttons and then control the 7seg and dc motor? or should the data from parallel port control the dc motor and the 7seg ( but then how can i include push buttons )? ; cursor functioncursor macro r,c mov bh,00 mov ah,02 mov dh,r mov dl,c int 10h endm; display functiondisplay macro str mov ah,09h mov dx,offset str int 21h endm.stack 64.data l1 db ' Welcome ','$' l2 db ' Press f to rotate clockwise ','$' l3 db ' Press r to rotate counter-clockwise ','$' l4 db ' You may adjust the speed by speed adjust buttons ','$' l5 db ' You can see the motor speed on the 7-seg ','$' l6 db ' Press q to quit the program ','$' delayer dw 33147 hu dw 0 ku dw 0 7segport db ? motorport1 db ? motorport2 db ? btnUpPort db ? btnDownPort db ? .code main: mov ax,@data mov ds,ax clr cursor 2,6 display l1 cursor 4,6 display l2 cursor 6,6 display l3 cursor 8,6 display l4 cursor 10,6 display l5 cursor 12,6 display l6 cursor 16,6 key_check: mov ah,07 int 21h cmp al,'r' je r_pressed cmp al,'f' je f_pressed cmp al,'u' je up_pressed cmp al,'d' je down_pressed cmp al,'q' je quit jmp key_check r_pressed: jmp key_check f_pressed: jmp key_check down_pressed: jmp key_check up_pressed: jmp key_check q_pressed: jmp key_check quit: mov ah,4ch int 21h end main http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay I think you should give me all the explanation of what peripherals you are going to use in your project.. and possibly send a circuit diagram because without that you cannot program.for now just send me list of peripherals like motor, 7-seg etc whatever u are going to use. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez the project is as i explained in my first message.It doesnt matter what microcontroller i use but i have to show the program coded in tasm.This program should work in Dos and it should control a dc motor and a 7seg control via rs232. And it should include 2 push buttons for speed adjustion.It is really important because i m dealing with my other exams in these days.Thanks for your attention. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay so you have two push buttons, one 7-segment and one DC-Motor. Use of buttons is to change speed.. is it? and rs232 also do the same?Please explain the use of switch and rs232.. are you going to use then together or u want to use them differently like two different programs. I hope you have already gone through the PWM code.. and code you posted before is a good start..Just make a flowchart how you want your peripherals to work only then you will be able to program. decide how your final thing will work.. and make flowchart on that. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez what do you suggest for peripherals?i will not use buttons to change speed. Everything must be controlled by keyboard and the asm program. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez actually i m mixed up.should i use microcontroller? or can everything be controlled from rs232?i dont know enough information to finish this thing. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay well.. use anything you want.. will be simple to do if you use RS232.. just receive and then and do work.. if you use RS232 then there will be no need of button.just receive a character from serial port and act upon the command.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez hmm.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay you already have the code for starting and stopping a motor.. all you need is to control speed now i am sure its not difficult for you as you already have the PWM code. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez the problem is i m not familer with tasm and there is no more sources or i couldnt find any.i can do anything in C, at least i can search but in asm and electronics i m limited. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay hmm.. so why dont you do it in C? everything is same in C as you do in asm.. just small differences.. ok write start and stop of motor in C PWM i will explain.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez CODE:
;delay function

delay   macro   duration
                        local waitf
                        mov cx,duration
                        loop waitf
                        end m
                       

                       

; cursor function
cursor  macro   r,c
               
                        mov     bh,00
                        mov ah,02
                        mov     dh,r
                        mov dl,c
                        int 10h
               
                endm


; display function
display macro   str
                        mov ah,09h
                        mov dx,offset str
                        int 21h
                endm

.stack 64
.data

        ;Seven Segment Table
       
        zero            db      3fh;            -   |    -      -       | |     |-      |-      -|      |-|     |-|
        one                     db      6;                 | |  |    _| _|   -  |-  |_  -|       -       -
        two                     db      5bh;            -       |   |_  _|        |      _| |_|  |      |_|      _|
        three           db      4fh
        four            db      66h
        five            db      6dh
        six                     db      7dh
        seven           db      7
        eight           db      7fh
        nine            db      6fh
       
        speedCtr        db      ?
       
        l1                      db      '                                               Welcome                                                                 ','$'
        l2                      db  '                   Press f to rotate clockwise                                                     ','$'
        l3                      db  '           Press r to rotate counter-clockwise                                             ','$'
        l4                      db  '   You may adjust the speed by 'u' for up and 'd'for down          ','$'
        l5                      db  '     You can see the motor speed on the 7-seg                                      ','$'
        l6                      db  '                   Press q to quit the program                                                     ','$'
       
       
       
.code
               
                mov dx,378h                             ;parallel port initialization
                mov al,00h                              ;for writing data
                out dx,al
                ; D7 is for forward D6 is for backward D5 is for enabling of dc motor with L293d
               
        main:
                mov     ax,@data
                mov     ds,ax
       
                clr
       
                cursor 2,6
                display l1
                cursor 4,6
                display l2
                cursor 6,6
                display l3
                cursor 8,6
                display l4
                cursor 10,6
                display l5
                cursor 12,6
                display l6
       
                cursor 16,6
       
                mov     [speedCtr],0
                 
        key_check:
                mov ah,07
                int     21h
               
                cmp al,'r'
                je      r_pressed
                cmp al,'f'
                je f_pressed
                cmp al,'u'
                je up_pressed
                cmp al,'d'
                je down_pressed
                cmp al,'q'
                je      quit
                jmp key_check

               
        r_pressed:
                delay 2;                                        wait for 2 seconds and then start rotating in reverse direction
                mov al,01000000b;                       01100000B for reverse direction
                mov dx,378h
                out dx,al
                jmp     key_check

       
        f_pressed:
                delay 2;                                        Wait for 2 minutes and then start rotation forward direction
                mov al,10000000b;                       10000000B for forward direction
                mov dx,378h
                out dx,al
                jmp     key_check

       
        down_pressed:
                add     [speedCtr],-1
                jmp     key_check

       
        up_pressed:
                add [speedCtr],1
                jmp     key_check


               
        quit:
                mov ah,4ch
                int 21h
                end     main http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay dez please show me what you have done till now.. I will add things which are needed..! http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez first i need to define a speedcontrol macro that will increase or decrease the speed when user push 'u' or 'd'.secondly i need a 7seg function that will send the speed to 7segment which is stored in speedCtrand thats all. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay are you using x86 processor? http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez yes i m trying to write just a program in dos to control the peripherals. There is no microcontroller http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay hmm... but i don't know much about x86 processors.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez i cant believe there are many step motor examples around the netbut there is no bloody dc motor by pwm example. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay actually speed of DC motor changes when you change the voltage of motor... and in digital world this is done with the help of Pulse width modulation.So i think you should see this for learning about PWM.I have no idea whether x86 processors have timers or not.. if not then it will be difficult to generate PWM, or you have to make use of some external thing to generate PWM.Please go through this to read about PWM.www.8051projects.net/forum-t1720-post.html http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez can you write psuedo code? http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay i can help you with 8051... if you can translate that..then will be possible i guess.. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez yes please http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez please just write the pseudo code,what should i do to increase speed? http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 dez Ofcourse they have, In asm there is a subroutine named waitf and all my problem was that. In order to arrange pwms, we should use it. But i didnt know how to use it, anywayi submit my last work as written below...It may have problems:S CODE:
                       
; cursor function
cursor  macro   r,c
               
                        mov     bh,00
                        mov ah,02
                        mov     dh,r
                        mov dl,c
                        int 10h
               
                endm


; display function
display macro   str
                        mov ah,09h
                        mov dx,offset str
                        int 21h
endm

waitf   macro   ; al times
            local waitloops
            shl al,2
            waitloops:
                 dec al
                 jnz waitloops
            endm

.model small
.stack 64
.data

        ;Seven Segment Table
       
        zero            db      01011011b;              -   |    -      -       | |     |-      |-      -|      |-|     |-|
        one                     db      00000110b;                 | |  |    _| _|   -  |-  |_  -|       -       -
        two                     db      01011011b;              -       |   |_  _|        |      _| |_|  |      |_|      _|
        three           db      01001111b;
        four            db      01100110b
        five            db      01101101b
        six                     db      01111101b
        seven           db      00000111b
        eight           db      01111111b
        nine            db      01101111b
       
        direction   db  'n'
       
        speedCtr        db      ?
        delayCtr    db  ?
       
        l1                      db      '                                               Welcome                                                                 ','$'
        l2                      db  '                   Press f to rotate clockwise                                                     ','$'
        l3                      db  '           Press r to rotate counter-clockwise                                             ','$'
        l4                      db  '   You may adjust the speed by 'u' for up and 'd'for down          ','$'
        l5                      db  '     You can see the motor speed on the 7-seg                                      ','$'
        l6                      db  '                   Press q to quit the program                                                     ','$'
       
       
       
.code
               
                mov dx,378h                             ;parallel port initialization
                mov al,00h                              ;for writing data
                out dx,al
                ; D7 is for forward D6 is for backward D5 is for enabling of dc motor with L293d
               
        main:
                mov     ax,@data
                mov     ds,ax
       
                ;clr
       
                cursor 2,6
                display l1
                cursor 4,6
                display l2
                cursor 6,6
                display l3
                cursor 8,6
                display l4
                cursor 10,6
                display l5
                cursor 12,6
                display l6
       
                cursor 16,6
       
                mov     speedCtr,0
                mov delayCtr,10
               
               
                 
        key_check:
            mov ah,01
            int 16h
            mov ah,00
            int 16h
                       
                cmp al,'r'
                je      r_pressed
               
                cmp al,'f'
                je f_pressed
               
                cmp al,'u'
                je up_pressed
               
                cmp al,'d'
                je down_pressed
               
                cmp al,'q'
                je      quit
                jmp key_check

    here:      
           
            mov dl,speedCtr
            cmp speedCtr,0
            je zerow
            cmp speedCtr,1
            je onew
            cmp speedCtr,2
            je twow
            cmp speedCtr,3
            je threew
            cmp speedCtr,4
            je fourw
            cmp speedCtr,5
            je fivew
            cmp speedCtr,6
            je sixw
            cmp speedCtr,7
            je sevenw
            cmp speedCtr,8
            je eightw
            cmp speedCtr,9
            je ninew      
            jmp endt
           
            zerow:
            mov dx,378h
            mov al,00000000b
            out dx,al
            jmp endt
           
            onew:
            mov dx,378h
            mov al,00010000b
            out dx,al
            jmp endt
           
            twow:
            mov dx,378h
            mov al,00100000b
            out dx,al
            jmp endt
           
            threew:
            mov dx,378h
            mov al,00110000b
            out dx,al            
            jmp endt
           
            fourw:
            mov dx,378h
            mov al,01000000b
            out dx,al
            jmp endt
           
            fivew:
            mov dx,378h
            mov al,01010000b
            out dx,al
            jmp endt
           
            sixw:
            mov dx,378h
            mov al,01100000b
            out dx,al
            jmp endt
           
            sevenw:
            mov dx,378h
            mov al,01110000b
            out dx,al
            jmp endt
           
            eightw:
            mov dx,378h
            mov al,10000000b
            out dx,al
            jmp endt
                       
            ninew:
            mov dx,378h
            mov al,00000000b
            out dx,al
           
            endt:
            jmp key_check

               
        r_pressed:
            cmp direction,'n'
            jne check_r
            mov direction,'r'
                ;delay 2;                                       wait for 2 seconds and then start rotating in reverse direction
                ;reverse e 1 gonderme fonksiyonu
                rgoes:
                mov al,127
                waitf
                mov al,00000001b;                       00000001B for reverse direction
                mov dx,378h
                out dx,al
                jmp here
                jmp     key_check

       
        f_pressed:
            cmp direction,'n'
            jne check_r
            mov direction,'f'

           
                fgoes:
            mov al,100
            waitf

                mov al,00000010b;                       00000010B for forward direction
                mov dx,378h
                out dx,al

                jmp here
                jmp     key_check
               
        check_f:
            cmp direction,'f'
            je fgoes
            waitf 1000;to delay when changing direction
            jne rgoes
         check_r:
            cmp direction,'r'
            je rgoes
            jne fgoes   
               
        stop:
            mov al,00000000b
            mov dx,378h
            out dx,al
            mov al,100
            jmp here
            jmp key_check

       
        down_pressed:
            dec speedCtr
            inc delayCtr
                cmp speedCtr,0
                je stop
                cmp direction,'f'
                je goingforward
                cmp direction,'r'
                dec speedCtr
                inc delayCtr
                je goingbackward
               
               
        goingforward:          
                mov al,00000010b;
                mov dx,0378h
                out dx,al
                mov al,speedCtr
                waitf
                mov al,00000000b;
                out dx,al
                mov al,delayCtr
                waitf
                jmp key_check
                jmp goingforward

               
                ;pwm signallerini azaltan fonksiyon
                ;7segment e speedCtr bastiran fonksiyon
                jmp here
                jmp     key_check
               
        goingbackward:
                mov al,00000001b ;PIN NUMARASI
                mov dx,0378h
                out dx,al
                mov al,speedCtr
                waitf
                mov al,00000000b;
                out dx,al
                mov al,delayCtr
                waitf
                jmp key_check
                jmp goingbackward

               
                ;pwm signallerini azaltan fonksiyon
                ;7segment e speedCtr bastiran fonksiyon
                jmp here
                jmp     key_check

       
        up_pressed:
                cmp direction,'f'
                je increase_forward
               
                cmp direction,'b'
                je increase_backward
               
                jmp key_check
               
                increase_forward:
                    inc speedCtr
                    cmp speedCtr,9
                    je key_check
                    dec delayCtr
                   
           
                    mov al,00000010b
                    mov dx,0378h
                    out dx,al
                    mov al,speedCtr
                    waitf
                    mov al,00000000b
                    out dx,al
                    mov al,delayCtr
                    waitf

                 jmp here
                 jmp key_check
                   
                increase_backward:
                    inc speedCtr
                    cmp speedCtr,9
                    je key_check
                    dec delayCtr
                   
                    mov al,00000001b
                    mov dx,0378h
                    out dx,al
                    mov al,speedCtr
                    waitf
                    mov al,00000000b
                    out dx,al
                    mov al,delayCtr
                    waitf

                jmp here
                jmp     key_check
               
               
        quit:
                mov ah,4ch
                int 21h
                end     main
               

   
               

           
           
           
           
  http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay Actually in PWM, timers should use interrupts.. wait routine will not work..i hope you have read the concept of PWM. So all we need to do is change the width of high level. if width is 255 then speed will be full and if width is 0 then speed will be low/motor stops.in the PWM code i gave you.. it works like this..R7 contains the value of high level and ranges from 0 to 255 as i explained.for pwm, i used a flag to indicate if high part of the square wave is done or not, coz the values loaded in the timer are different for both high and low level of square wave but the total value of high and low is 255.So lets say if high is 50, i.e. R7 is loaded with 50 and low will be 255-50 = 205.you can see in the code too.. during one part of PWM i am loading Timers with R7 and in other part of square wave i am loading 255-R7 in timer.so total 255 will remain constant only i am changing the value of R7 to control the width. you can possibly make your program to work as i explained. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 HiGiNS I want to convert L293D component to library and model file in proteus. But I cant make proper MDF file. Simulation part is starting but motors are not working. http://www.8051projects.net/forum-t4572.html 2009-01-07T22:27:33-08:00 Ajay to create models you need VSM SDK. All you need to do is use APIs provided... i never tried making one.. but now you have encouraged me to try it out..