Project Logs

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• Finished (Enough)

  Nate Bowen • 04/09/2016 at 21:07 • 0 comments

  I came to school this morning (Saturday, 4/9/16) hoping that someone might be able to let me into the Microprocessors lab at some point today. After working on some other homework near the entrance for about an hour, I spotted my TA walking in. Praise God!

  So I worked on the project for about 5 hours and I think I've got it to a good place to call finished. There are some points I'm not going to get, but the complexity of those requirements is something I'm not about to spend another 10 hours on.

  What I completed today:

  • Incorporated the Buzzer with an additional "include" file.
  • Floors numbers displaying correctly on LCD, no matter which floor they are called from.
  • LEDs are all mapped and turning on and off when they should.
  • Added a second version of the "Readkeys" subroutine that loops finitely rather than in-finitely so that a keypress can interrupt the delay routine.
  • Macro to write a blank line to the LCD.
  • "Arrive" subroutine that fills in a gap in the logical of arriving at a floor (convenient, eh?).

  Added a video to the details section! Enjoy!

• LCD Troubles, Flow, Due Date, and Todos

  Nate Bowen • 04/08/2016 at 13:12 • 0 comments

  Yesterday, Thursday 4/7/16, I was in the lab from 12:00-2:30. It was not exceedingly successful in terms of getting closer to the finished project. I spent a lot of time trying to make the LCD display the correct floor number, regardless of which floor form which the user is starting the motion. Unfortunately, I ran out of time as I was getting close - I think ;). I actually think that I have the flow of the program complete. All of the major loops and subroutines (and returns) appear to be functioning as I intend them to.

  I still don't know if this thing is supposed to be done by Tuesday, 4/12/16, but I can't imagine anyone in class is going to be finished if the lab isn't opened between now and then.

  Todos:

  • Correct floor displayed on LCD
  • Incorporate buzzer
  • Write open/close door routine
    • The skeleton and calls to these subroutines already exist.
    • I need to add a call to WRT_STRING in each
  • Turn on correct LEDs at the correct time

• Organization and Flow Improved

  Nate Bowen • 04/06/2016 at 02:45 • 0 comments

  I was in the lab today from 11:30-4:00. Made quite a bit of progress on the logical flow and organization of the project.

  One of the big milestones was learning how to use additional files as libraries. I broke the code up into 4 or 5 separate files based on functionality. This was as simple as creating a text document with the .inc suffix, right-clicking on the "Sources" directory in the project tree, and adding the text document. The code was modified as such:

  ;***************
  ;Header....
  ;
  ;***************
  ...
     INCLUDE 'newText.inc'
  ...
     Code

  I also worked out a lot of the logical flow. There is essentially a forever loop in the main function. In its ready state, it is waiting for keypad input. A series of compare instructions test which subroutine to jump to based on which key is pressed. The current draft of this loop is shown below:

  MAIN
          
      ;Waiting for Input
      JSR     READKEYS
      
      STAA    LAST_KY        
      
      CMPA    #OPEN
      BEQ     B1
      
      CMPA    #CLOSE
      BEQ     B2
         
      CMPA    #EXT_1
      BGE     B3
      
      CMPA    #INT_1
      BEQ     B4
      
      CMPA    #INT_2
      BEQ     B4
      
      CMPA    #INT_3
      BEQ     B4
      
      CMPA    #INT_4
      BEQ     B4
   
  B1 JSR     OPEN_DOOR
      BRA     MAIN
      
  B2 JSR     CLOSE_DOOR
      BRA     MAIN    
      
  B3 JSR     COME
      BRA     MAIN   
      
  B4  JSR     GOTO    
      BRA     MAIN

  This thing is supposed to be done by next Tuesday, but with only one more lab day available to us before then, I'm not sure how far we are going to get. I plan on working in the lab on Thursday, 4/7/16, 12:00-2:00.

• Writing string to LCD in ASM

  Nate Bowen • 04/02/2016 at 05:07 • 0 comments

  To write a string to the LCD on the HCS12, I wrote the following bit of assembly:

  ;main bit of program running up here
  ;               ....  ........              
  ;               ....  ........
                  LDX   #NEX_FLR        ;load X with string pointer
                  LDY   #NEX_LEN        ;load Y with string length
                  JSR   WRT_STRING      ;jump to WRT_STRING sub
                  
  
  WRT_STRING					
  DISP		  
  		LDAA  X               ;put the value at X in A
  		JSR   DATWRT4         ;sub to write the character
  		JSR   DELAY           ;required delay for LCD
  		INX                   ;next letter in the string
  		DBNE  Y, DISP         ;decrement string count and repeat
  		RTS                   ;once string is all printed, return
  
  
  NEX_LEN EQU     11                    ;string length
  NEX_FLR FCB     'Next Floor '         ;string contents

• Project creation, source notes, to-dos.

  Nate Bowen • 04/02/2016 at 04:58 • 0 comments

  I have uploaded a number of files associated with this project. We have been given source assembly code to get us going with interfacing the HCS12 with the LCD and keypad on the Dragon12 board.

  I spent some time in the lab on Thursday, 3/31/16 during Ayaz's office hours. I was able to get the LCD to display keypad digits and characters. I am working on better merging the LCD and keypad source code. I hope to work some sort of library structure into the mix to improve the organization of the project.

  My next opportunity for lab time will be Tuesday, 4/5/16, 11:30-4:00.

  To-do:

  • Define memory structure
  • Explore library organization
  • Define LED and keypad assignments
  • Create all necessary strings for LCD display

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