Remote-processing RPC-2350 Uživatelský manuál stáhnout pdf (Strana 19)

SAVING AND LINKING PROGRAMS CHAPTER 3

3-4

7000 IF A = 0 THEN 7100

7100 EXIT CLEAR

7110 LOAD 1 RUN

The above example shows how to link to another

program within a subroutine. If you do not use EXIT

CLEAR, you will eventually end up with an <Out of

memory> error.

Declare variables

All variables, dimensioned arrays, and string variables

should be declared in the first program. These variables

are accessible to both programs.

Program Re-entry

There is a good chance you will have declared a

dimensioned array or made room for strings in the

autorun progr am. If you do a C LEA R again, all

variables will be cleared.

What you must do when you enter a program is to test

for a re-entry flag at the start. If it is 0, then the

program know s to go and do va riable initialization. If it

is not 0, then it skips around it. For example:

10 IF FLAG <> 0 THEN 100

20 CLEAR 500 :’Clear space

30 DIM WEIGHT(100)

40 DIM B$(20)

. More initialization code

100 FLAG = 1:’Signal initialized

110 ON ERR GOTO 10000

120 CONFIG COM$ 2,0,8,0,1

130 ON COM$ 2 GOSUB 2000

The code will not skip around the multitasking

statements when it is first Autorun. This is because, by

default, all Basic variables are reset to 0. When you link

programs, variables remain intact.

SAVING PROGRAMS VS SAVING DATA

A program number and F lash segment are related by the

following formula:

Flash segment = program number + 8

If you intend to save data to Flash, m ake sure you do not

write to a program area. Programs are always saved

starting at address 0 and continue until end of program.

You can save data above a program.

The important thing here is to remember that saving

programs to Flash and saving data to Flash are related.

COMMANDS

The following is a list of CAMBASIC commands used

for saving and loading programs.

Command Function

LOAD Transfers program from U3 to RAM

for editing or running.

LOAD n Transfers program of specified area of

U3 to RAM.

LOAD data Multi-part syntax command that

moves data from Flash to RAM or

RAM to RAM. Refer to Chapter 5 or

the CAMBASIC manual for more

information.

SAVE Saves a program from RAM to U3 for

Autorun

SAVE n Save a program from RAM to a

program area of Flash.

SAVE data Multi-part syntax command that saves

data from RAM to Flash. Refer to

Chapter 5 or the CAMBASIC manual

for more inform ation

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