Specifications

BASIC Stamp II
Page 302 • BASIC Stamp Programming Manual 1.8 • Parallax, Inc.
Read
READ location,variable
Read EEPROM location and store value in variable.
• Location is a variable/constant (0–2047) that specifies the
EEPROM address to read from.
• Variable holds the byte value read from the EEPROM (0–255).
Explanation
The EEPROM is used for both program storage (which builds down-
ward from address 2047) and data storage (which builds upward from
address 0). The Read instruction retrieves a byte of data from any
EEPROM address. Although it’s unlikely that you would want to read
the compressed tokens that make up your PBASIC2 program, storing
and retrieving long-term data in EEPROM is a very handy capability.
Data stored in EEPROM is not lost when the power is removed.
The demo program below uses the Data directive to preload the
EEPROM with a message; see the section BS2 EEPROM Data Storage
for a complete explanation of Data. Programs may also write to the
EEPROM; see Write.
Demo Program
This program reads a string of data stored in EEPROM. The EEPROM
data is downloaded to the BS2 at compile-time (immediately after you
press ALT-R) and remains there until overwritten—even with the power
off.
' Put ASCII characters into EEPROM, followed by 0,
' which will serve as the end-of-message marker.
Message data "BS2 EEPROM Storage!",0
strAddr var word
char var byte
strAddr = Message ' Set address to start of Message.
stringOut:
READ StrAddr,char ' Get a byte from EEPROM.
if char <> 0 then cont ' Not end? Continue.
Stop 'Stop here when done.