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SETUP AND OPERATION CHAPTER 2

Page 6 RPC-150

downloaded file. For example, you could have the

following in a file written on your editor:

'Check temperature

'Read the output from the RTD and

' calculate the temperature

2200 a = ain(0) :'Get temp

The first 3 comments downloaded to the RPC -150

would be ignored. Similarly, the empty lines between

comm ents are a lso ignored . Line 2200, with its

comment, is a part of the program and could be listed.

The major pena lty by wr iting a progr am this way is

increased download time.

Notice that you can write a program in lower case

characters. CAMBASIC translates them to upper case.

Some program mers put "N EW" as the first line in the

file. During debugging, it is common to insert

"temporary" lines. Adding NEW ensures that these lines

are gone. D ownloading time is incr eased when the old

program is still pre sent.

If you like to write programs in separate modules, you

can download them separately. Modules are assigned

blocks of line numbers. Start up code might be from 1

to 999. Interrupt handling (keypad, serial ports) might

be from lines 1000 to 1499. Display output might be

from 1500 to 2500. The program mer m ust determine

the number of lines required for each section.

When replacing a program or section, downloading time

is increased. Blocks of line numbers cannot be

renumbered by CAMBASIC when other par ts of the

program are installed. However , if a particular section

is the only program downloaded, then line renumbering

in that range is possible. Refer to the CAMBASIC

RENU M comm and.

CAM BASIC automatically formats a line for minimum

code space and increased readability. For example, you

could download the following line of code:

10 fora=0to5

When you listed this line, it would appear as:

10 FOR A = 0 TO 5

Spaces are initially displayed but not stored. The

following line:

10 for a = 0 to 5

would be compressed and displayed as in the second

example above. Spaces are removed.

The CAMBASIC Programming Manual has more

information about increasing program speed and editing

options.

Instead of uploading and downloading programs, you can

save them to the on card EPROM. This is useful if you

are using a terminal to write program s. Make sure the

' AUTO RUN' jumper is installed (See Chapter 3

SAVING PROGRAMS). To prevent automatic program

execution on power up, insert the STOP statement at the

beginning of the program (such as line 1). When you

power up the RP C-150, the progr am is tra nsferr ed into

RAM and executed. Delete the program line with the

STOP statement to normally start programs. When

saving programs, be sure to reenter the STOP statement

with its line number.

WHERE TO GO FROM HERE

If you want to do this: Turn to

Chapter

Save a program 3

Autorun a program 3

Know m ore abo ut serial por ts 4

Battery backing up RAM 5

Use RAM to save variables 5

Configure digital I/O lines 6

Get switch status 6

Use high current outputs 6

Connect an external opto rack 6

Installing calendar/clock module 7

Using a keypad 8

Speaker port 9

Also, refer to the table of contents for a listing of other

functions.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 25 26

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