Remote-processing RPC-330 Manuel d'utilisateur télécharger pdf (Page 33)

KEYPAD PORT SECTION 9

Page 9-1 RPC-330

Figure 9-1 Keypad connector

INTRODUCTION

16, 20, or 24 position keypads are plugged into keypad

port J5. Keys are arranged in a matrix for mat. A key is

recognized when a row and a colum n connect.

RPBASIC-52 scans and debounces the keypad every 50

ms. Keypad pr esses are retur ned as a num ber fr om 1 to

24 using the KE YPA D function . Ke ypad scann ing is

always active and cannot be turned off. Up to 8 key

presses are buffered.

Keypad presses are multi-tasked using ON KEYPAD.

When a key is pressed, the program branches to the

subroutine.

Keypads from Remote Processing simply plug into J5.

The keypad cable length should be limited to less than 5

feet.

PROGRAMMING EXAMPLE

The following example sets up RPBASIC to scan a 16

position keypad. T he results are echo ' ed when a key is

pressed. Press the 'D' key to enter.

10 STRING 200,20

20 $(0) = "123A456B789C*0#D"

30 P = 1

40 PF = 0

50 PRINT "Enter a number from the keypad",

REM Rest of program continues

REM Scan keypad and update display

200 GOSUB 500

210 IF PF = 0 THEN 200

220 PRINT

230 PRINT "Entered string is: ",$(2)

240 PF = 0

250 GOTO 50

500 A = KEYPAD(0)

510 IF A = 0 THEN 500

520 IF A = 12 THEN 600 : REM Process clear

530 IF A = 16 then 700 : REM process enter

540 A=ASC($(0),A)

550 PRINT CHR(A),

560 ASC($(2),P) = A

570 P = P + 1

580 ASC($(2),P) = 13

590 RETURN

600 REM Clear input string

610 $(2) = ""

620 P = 1

630 RETURN

700 REM Enter processing

710 P = 1

720 PF = 1

730 RETURN

Program explanation

Line 20 defines the keypad legend. Letters may be

redefined as necessary.

Line 30 sets the position counter used to insert characters

into the string.

Line 200 w aits for a key press. The enter ed string is

printed.

Line 500 checks the keypad. If a character is available,

it processes it.

Lines 540-590 update the input string and position. A

< CR> is inserted to mark the end of string.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 47 48

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Remote-processing RPC-330 Manuel d'utilisateur Page 33

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