Remote-processing RPC-210 Manuale Utente Scaricare il pdf (Pagina 11)

SETUP AND OPERATION SECTION 2

Page 2-5

Downloading a program requires transmitting an ASCII

file. As you type in (or download) a line, RPBASIC-52

tokenizes that line. The time to do this depends upon its

complexity and how many lines of code have been

entered.

RPBASIC-52 m ust finish compiling a line before starting

the next one. When a line is compiled, a "> " character

is sent. This should be your terminal programs pacing

character when downloading a program.

If your communications program (such as

Hyper Terminal) cannot look for a pacing pr ompt, set it

to delay transmission after each line is sent. A 100 ms

delay is usually adequate, but your program may be long

and complex and require more time. A result of a short

transmission time is missing or incomplete program

lines.

Editing programs and programming hints

Files uploaded or downloaded are simply ASCII DOS

text files. No special characters or control codes are

used. You may create and edit programs using your

favorite word processor or editor. Just be sure to save

files in DOS text form at.

A technique used to further program documentation and

reduce code space is the use of comments in a

downloaded file. For example, you could have the

following in a file written on your editor:

REM Check position

REM Read output from the pot and

REM calculate the position

2200 a = ain(0) :REM Get position

The first 3 comments downloaded to the RPC -210

are 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. RPBASIC-52 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. Putting in “NE W” ensures that these

lines are gone. Dow nloading time is increased when the

old progr am is still present. If you like to wr ite

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 programmer must determine the number

of lines required for each section.

RPBASIC-52 automatically formats a line for minimum

code space. 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 accepted but not stored. The following line:

10 for a = 0 to 5

is compr essed and disp layed as in the se cond exam ple

above. Spaces are removed. However, spaces as part

of a remark or PRINT are not removed.

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. Simply type

SAVE. To retrieve a progr am, type LOAD. Your

system has a 512K EPROM, so you can save and load

up to 7 programs using these commands. See SECTION

3 and Appendix A for more inform ation.

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Remote-processing RPC-210 Manuale Utente Pagina 11

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