Assignment #5 / Project #2: Serial IO

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Tue, 10/21/2008 - 11:07 — mpare

Due: Oct. 28, 2008

Homework #5

Write a program to take single byte input data in the range of $00…$0F and print the corresponding character on the serial port. Print only one character from 0….F. In order to accomplish this, you have to include a routine to convert the input byte into the corresponding ASCII code.

Project #2

Include that routine into the keypad scan routine such that (the ASCII code representing) the key that is pressed get’s printed on the serial port.

Information and Resources

Page 85 of DBug12Manual.pdf contains DBug 12 functions ($EE84, $EE86, $EE9C) that we can use for purposes of getting and putting characters over serial I/O.

Page 400 of 9S12DP256 Processor.pdf discusses serial interface details.

Page 406 of 9S12DP256 Processor.pdf gives the data format diagram.

RDRF is basically the indicator when data is available on the serial interface.

******************************************************************************
************************* Put Character to Serial ****************************
******************************************************************************
PChar:  BRCLR   SCI0SR1, $80, Pchar     ; loop until transmit data register
        STAB    SCI0DRL                 ; Send Character
        RTS                             ; Return from subroutine
 
******************************************************************************
************************ Get Character From Serial ***************************
******************************************************************************
GChar:  BRCLR   SCI0SR1, $20, GChar     ; Loop until receive data register
        LDAB    SCI0DRL                 ; Receive Character
        RTS                             ; Return from subroutine

Attachment	Size
ASCII DBug12.asm	2.86 KB
EE 3362 HW5 _ PROJ2.doc	23.5 KB

EE-3362

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