28123 Parallax Inc, 28123 Datasheet - Page 301

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

LOOP UNTIL index = 5
DEBUG CR, "Password is correct;", CR,
END
Your Turn – Modifying Passwords
Modifying Password Checker for Use in a Larger Program
The goal is to make it easy to fit the PasswordChecker.bs2 program into the example
program from Activity #3. Two things will help. First, the password checking program
should be modified so that it does most of its work in a subroutine. The different parts of
the program should also be labeled with commented headings to help make it clear how
to combine the two programs.
Example Program: ReusablePasswordChecker.bs2
ReusablePasswordChecker.bs2 works the same as PasswordChecker.bs2, but it now uses
a subroutine to do the work, and it has been reorganized into labeled sections.
DEBUGIN STR userEntry \5
FOR index = 0 TO 4
NEXT
IF index <> 5 THEN
ENDIF
READ Password + index, temp
IF temp <> userEntry(index) THEN EXIT
DEBUG CR,"Password not correct.", CR
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Modify the
password.
By changing five different values in the program, you can also modify it so
that it accepts a four character password instead of a five character password.
Verify that the program still works the same as PasswordChecker.bs2.
Examine how the
"program can continue..."
Password DATA
DO…LOOP UNTIL
directive so that it uses a different five character
code block was placed into a subroutine.
' Get user input password.
' Check array against DATA
' Get next password char
' Compare to user input,
' exit if not equal.
' If exit, then index not equal
' to 5 and pass is not correct.
' Only get out of loop when
' index = 5.
' Program can move on when
' password is correct.