Remote-processing RPC-2350 Bedienungsanleitung PDF herunterladen (Seite 51)

KEYPAD PORT CHAPTER 9

9-2

The following example sets up CAMBASIC to scan a 16

position keypad. P orts A and B are set fo r outputs

(presumably to drive the LCD display and high current

port) The results are echo' ed to the display.

10 CONFIG PIO 1,0,0,1,0,64

20 'Optionally change keypad char 'B'

30 ' to the letter 'M'

40 POKE SYS(8)+7,77

60 ON KEYPAD$ 16 GOSUB 500

70 PRINT " Enter a number";

100 'loop for this example

110 GOTO 100

500 A$ = KEYPAD$(0)

510 IF A$ = "C" THEN ..clear_beep

520 IF A$ = CHR$(13) THEN ..enter

530 PRINT A$;

540 B$ = B$+A$

560 RETURN

600 ..clear_beep

610 B$=""

630 DELAY .4

650 PRINT CHR$(12); “ ” CAR$(12);

660 RETURN

700 ..enter

710 FL = 1

730 RETURN

Program Explanation

Lines 10-80 set up the parameters for the keypad.

Lines 500 to 730 process the key press. If a "C " or "#"

is pressed, it is an exception and is handled that way.

Otherwise, the character is displayed and stored.

Lines 700 to 730 process the "enter" key. The enter

flag, FL , is set to a 1 to indicate to another part of the

program that B$ has complete data.

The KEYPAD$(0) function returns a single character

string that has been assigned to a particular key.

Characters ar e assigned usin g the SYS(8 ) statemen t.

Keypad Commands

There are several keypad commands. See the table at

the end of this chapter.

KEYPAD PORT PI N OUT - J5

The keypad port uses port C from an 82C55. Lower

port C is configured as an input. Upper port C are

outputs.

The table below lists J5' s pin out, 82C55 port and bit,

and its intended function.

Pin 82C55

Port/bit @ U19

Function

1 C/0 Row 1

2 C/6 Column 3

3 C/5 Column 2

4 C/1 Row 2

5 C/2 Row 3

6 C/4 Column 1

7 C/7 Column 4

8 C/3 Row 4

9 B/0 Column 5

10 B/1 Column 6

Ground is not used.

COMMANDS

The following is a list of CAMBASIC commands for the

keypad.

Command Function

CONFIG PIO Configures digital I/O port

INPUT KEYPAD$ Input data from a keypad

KEYPA D$(n) Returns last key from keypad

port.

ON KEYPAD $ 16

ON KEYPAD $ 24

Causes a program branch

when a key is pressed

SYS(8) Returns keypad string address

to modify characters.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 82 83

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