Remote-processing RPC-210 Instrukcja Użytkownika Pobierz pdf (Strona 16)

SAVING CODE AND DATA BASIC SECTION 3

Page 3-3

Using HIDE with RTC serial number

Each real time clock (RTC) has a unique serial number

associated with it. T his serial num ber may be used in

conjunction with your program to make sure a board was

not purchased from us and your system copied.

When used with HIDE, it becomes extremely difficult to

virtually impossible for someone to simply copy a

system since the serial num ber in your pr ogram is also

hidden.

See RTC-4.BAS and READING CLOCK SERIAL

NUM BER in SECTION 7 for a little more inform ation.

SAVING AND READING DATA

Data is saved to and read from Flash EPROM using

BSAVE and BLOAD commands. Any nume ric (bytes,

words, and floating point numbers) and string data can

be saved and read back. Data may be stored in Flash as

part of a data logging program.

The Flash EPROM has a limited number of write cycles

(1000 - 10, 000) per 256 byte sector, so writing data

should be kept to a minimum. Data may be read from

Flash an unlimited number of times.

NOTE: Future R PC-210 versions will change the F lash

EPROM type. The new type will be a

traditional flash. Major difference is sector

size will be 64K bytes instead of 256 bytes.

Another difference is the flash must be erased

before over-writing existing data. Curr ent flash

type (29C040A) allow s overw riting in 256 byte

sectors. Basic BSAVE com mand will be

modified to include an er ase option (E ) that will

erase the entire flash. C ontact Rem ote

Processing for mor e information.

Remember that your program is stored in segment 1.

RPBASIC-52 is stored in segment 0. Segments 2-8 may

be used to store programs also. Make sure you do not

write over your programs. A safe method to saving data

is to start in segment 2 (assuming there is no program

there) and go up from there.

Data can not be POKE’ed directly Flash EPROM).

When accessing data from EP ROM , add 8 to the

segment specified by the comm and. Com mands used to

read from EPROM are:

PEEKB PEEKW

PEEKF PEEK$

See SAV_LOD. BAS in the BASIC52 directory for an

example of how these commands are used.

Data must be put into RAM first before it can be written

to Flash. Writing to Flash is done in 256 byte sectors.

If you want to save just 1 byte, 256 bytes ar e written to

at a time.

When specifying a write addr ess, the form at should be in

0XX00H . ‘XX’ is any valid hex address. The least

significant byte should be 00.

Keep in mind wr iting takes about 50 mS/1000 bytes.

During BSAVE, interrupts are recognized but not

serviced. If these commands must be serviced quicker,

write data in blocks of 256 bytes. It takes a little over

10 mS to write from 1 to 256 bytes of data. The 10 mS

time is a ‘burn’ time for the Flash.

Block Data Transfer

Blocks of data are transferred to and from RAM and

Flash EP ROM using BLOAD and BSAVE commands.

Block transfers are useful for loading and storing data,

look-up tables, text, etc. U p to 65,535 bytes can be

moved from RAM to EPROM or EPROM to RAM at

one time. The absolute number of bytes that can be

moved is limited by the RAM and EPROM sizes.

Transfers from EPROM to RAM , using BLOA D, take

approximately 23.5 m s/1000 bytes. T ransfers from

RAM to EPROM , using BSAVE, are even longer at 75

mS/1000 bytes.

Serial port, tick timer, and external interrupts are

enabled dur ing these transfers. However, responses to

ONT ICK or ONIT R are delayed by the time it takes to

transfer data. W hen ONTIC K or ONITR must be

serviced faster, transfer data in sm aller blocks.

Refer to BLOAD and BSAVE in Appendix A for more

information.

ASSEMBLY LANGUAGE INTERFACE

Assembly language programs are placed in the Flash

EPROM. W hen using RP BASIC -52, programs should

start at address 7000H or higher up to FFFFH.

Code development can take place in a number of

different ways. Contact Remote Processing technical

support for ways appropriate to your situation.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 59 60

Komentarze do niniejszej Instrukcji

Brak uwag

Remote-processing RPC-210 Instrukcja Użytkownika Strona 16

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Komputery Remote-processing RPC-210