From: Subject: Prac 3 - AVR Assembly Language Programming Date: Thu, 2 Aug 2007 11:31:26 +1000 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_005F_01C7D4F8.A96E3B20" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_005F_01C7D4F8.A96E3B20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.itee.uq.edu.au/~elec2002/pracs/prac_3/index.html Prac 3 - AVR Assembly Language Programming

ELEC2002 - Prac 3

AVR Assembly Language Programming

Updated - 24 August, 2006 Author: Len Payne, modified by Peter Sutton = and Peter Waldeck=20

Goal

See the following topics:=20

Back to = Lab=20 Experiment Index=20

Preparation

  1. Bit Reversal

    Write an assembly language program for the AVR8515 Project Board to =

    • Input 8 bits of data from the Port C pins.=20
    • Invert the data.=20
    • Output the result to Port B.

    The skeleton code for this program is provided in pra= c3-1.asm.=20 Replace the lines ";<-YOUR CODE=20 HERE->" with your code.=20

    The following IO registers will be used:=20

    DDRB=20 Port B Data Direction Register=20
    PORTB=20 Port B Data Register=20
    DDRC=20 Port C Data Direction Register=20
    PINC=20 Port C Input Pins Address

  2. Bit Recognition

    Write an assembly language program for the AVR8515 Project Board to =

    • Input 8 bits of data from the Port C pins.=20
    • Determine the position of the bit that is set to 1.=20
    • Output the result as a decimal number to Port B.

    Only a single bit should be set to 1. The decimal number output to = Port B=20 will be in the range of 0 to 7. For example, if bit 6 of the input = data is set=20 to 1, then $06 (00000110 in binary) is output to Port B. If more than = one bit=20 is set or no bits are set then output $FF (i.e. all ones) to Port B.=20

    The following flowchart illustrates an algorithm for solving this = problem.=20 This algorithm compares the value read in from port C with values = 0x80, 0x40,=20 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 (i.e. all the 8-bit patterns with = only one=20 bit set). The bitpos counter counts down from 7 to 0 and will be the = number we=20 output if we find a pattern that matches. If no pattern matches when = we reach=20 the end then we output all ones to port B.

     

    The skeleton code for this program is provided in pra= c3-2.asm.=20 Replace the lines ";<-YOUR CODE=20 HERE->" with your code.=20

    The following IO registers will be used:=20

    DDRB=20 Port B Data Direction Register=20
    PORTB=20 Port B Data Register=20
    DDRC=20 Port C Data Direction Register=20
    PINC=20 Port C Input Pins Address

  3. Bit Recognition - only when flagged

    Write an assembly language program for the AVR8515 Project Board to = carry=20 out the following steps only when a pushbutton connected to the PORTD2 = (i.e.=20 bit 2 of port D) input is set to 0.=20

    • Input 8 bits of data from the Port C pins.=20
    • Determine the position of the bit that is set to 1.=20
    • Output the result as a decimal number to Port B.

    The skeleton code for this program is provided in pra= c3-3.asm.=20 Replace the lines ";<-YOUR CODE=20 HERE->" with your code. Much of this code will be the = same as=20 for part 2 above.

    The following IO registers will be needed:=20

    DDRB=20 Port B Data Direction Register=20
    PORTB=20 Port B Data Register=20
    DDRC=20 Port C Data Direction Register=20
    PINC=20 Port C Input Pins Address=20
    DDRD=20 Port D Data Direction Register
    PIND Port D Input Pins Address

Back=20 to Contents=20

Procedure

  1. Bit Reversal

    Assemble the program that you have written and and program it into = the=20 device on the AVR8515 Project Board.=20

    With your program in the device on the project board, carry out the = following steps:=20

    1. When using the Grey-Box power supply (47-311):=20
      1. Switch off the power supply to the project board and = logic=20 workstation.
    2. Connect wires from the eight PORT B pins on the project board to = the=20 LEDs on the logic workstation.=20

    3. Connect wires from the eight PORT C pins on the project board to = the=20 toggle switches on the logic workstation.=20

    4. Connect a wire from the GND pin on the project board to a GND = pin on the=20 logic workstation.=20

    5. When using the Grey-Box power supply (47-311):=20
      1. Switch on the power supply to the project board and logic = workstation.=20
    6. Press the red reset button on the project board.=20

    7. Set various values on the switches and check that the complement = of=20 these values is indeed shown on the LEDs.
       

  2. Bit Recognition

    Assemble the program that you have written and and program it into = the=20 device on the AVR8515 Project Board.=20

    Use the same wiring connections for this program as you did for the = Bit=20 Reversal program except use the 7-segment displays instead of the = LEDs for=20 PORT B. Carry out the following steps:=20

    • Set various values on the switches and check that the values = shown on=20 the 7-segment displays are correct.
       

  3. Bit Recognition - only when flagged

    Assemble the program that you have written and and program it into = the=20 device on the AVR8515 Project Board.=20

    Use the same wiring connections for this program as you did for the = "Bit=20 Recognition" program. Carry out the following steps:=20

    1. When using the Grey-Box power supply (47-311):=20
      1. Switch off the power supply to the project board and = logic=20 workstation.

    2. Connect a wire from the Port D2 pin on the project board to a = pushbutton=20 on the logic workstation.=20

    3. When using the Grey-Box power supply (47-311):=20
      1. Switch on the power supply to the project board and logic = workstation.=20
    4. Press the red reset button on the project board.=20

    5. Repeatedly, set a value on the switches, press and release the=20 pushbutton and check that the value shown on the LEDs is correct. = The value=20 on the LEDs should only change when the pushbutton value is 0 - = never when=20 the pushbutton value is 1.=20

Back=20 to Contents=20

Equipment

Back=20 to Contents=20

References

Back=20 to Contents=20

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