Remote-processing RPC-210 Manual de usuario descargar pdf (Pagina 26)

RAM BASIC SECTION 5

Page 5-1

Figure 5-1 RPBASIC-52 Memory Map

INTRODUCTION

RAM SECTION 5

512K of RAM is battery backed on the RPC-210. RAM

size is determined by the IC in U 5, w hich is solder ed in

at the time of production.

Battery to back up RAM life depends upon several

factors: RAM size, power consumption, ambient

temper ature, humidity, and amo unt of time the board is

operating. Generally, a battery life of about 3 to 5 years

can be expected. Operating the board at 50°C reduces

battery life by ½.

Maximum program and variable size is about 60K.

Additional RAM increases the amou nt of space available

for PEEK and POKE storage.

This sections discusses saving and retrieving variables to

RAM.

SAVING AND READING RAM DATA

The following commands are used to read from and

write to RAM.

PEEKB POKEB

PEEKW POKEW

PEEKF POKEF

PEEK$ POKE$

BLOAD BSAVE

PEEK and POKE type commands work on bytes (B

suffix, 8 bit length), words(W suffix, 2 bytes), floating

point numbers(F suffix,6 bytes ), or strings ($ suffix, set

by STRING command). A segment number,

corresponding to a 64K block, along with an addresses,

allows access to all RAM on a board. BLOAD and

BSAVE can be though of as block transfer comm ands.

BSAVE, however, writes to Flash EPRO M only.

Sample program ARRAY S.BAS show how to store and

retrieve “mixed” data types using RAM.

NOTE: Futur e version (Per haps starting in 2012) will

have an enhanded BSAVE command. The

newer BSAVE com mand will have an erase

flash sector capability. Contact R emote

Processing for mor e information.

PEEK segment limits are different on the RPC-210 than

those listed in the RPBASIC -52 manual. segment limits

are 0-15 instead of 0-7. segment 8-15 accesses EPROM.

Writing and reading memory

See mem ory m ap figure 3-2. "Data storage area" is

segment 1 to 7 in RAM , 9 to 15 in EPROM . Avoid

writing to segment 0.

PEEK and POKE type commands store and retrieve

values from memory. For example:

20 POKEB1,12,A

puts the byte value of A into segment 1, addr ess 12.

Use the PEEK statement to retrieve the variable:

50 B = PEEKB(1,12)

Saving different data types

Many times it is desirable to store an array containing a

"mixed" set of variables. Suppose you needed to save an

array m ade up of the following elements:

Bytes Type Description

1 Byte Job counter

2 Word Analog output offset

6 Floating point Correction factor

20 String Job name

Total number of byes required for each array is 30 (add

1 for a < CR> at the end of the string).

The Job counter is incremented ever y time it is

completed. Analog output offset is an output constant or

other var iable used to initialize the outputs. Job name is

used with the display to identify a job.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 59 60

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Remote-processing RPC-210 Manual de usuario Pagina 26

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