28029 Parallax Inc, 28029 Datasheet - Page 45

• Manufacturer Part Number: 28029
• Description: KIT PARTS SMART SENSORS W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28029

• Accessory Type: Parts Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® or Javelin Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 28029PAR

Chapter 1: Parallax Serial LCD Display · Page 33
The TestScrollingSubroutine.bs2 uses the variables shown in Figure 1-23 for the sliding
window. The
variable stores the position that the cursor is placed each
cursorStart
time before it starts printing the characters in the message. In the figure,
cursorStart
stores the value 135. The next time the text shifts to the left, it will store 134. Two
variables,
and
, store the beginning and ending addresses of the text that will
head
tail
fit in the message window. In the figure,
stores 0, and
stores 2. The
head
tail
pointer
variable will be used by the
command to get the right character, and the
READ
character
variable will store the character the
command retrieves from EEPROM.
READ
Figure 1-23: Variables from TestScrollingRoutine.bs2.
In Figure 1-23,
is pointing at character 1 in the sequence, which is "e". A
pointer
...
loop uses the
variable to read each of the characters in EEPROM,
FOR
NEXT
pointer
from
to
and then display each with the
command. Each time the text
head
tail
SEROUT
shifts to the right, the new text has to overwrite the old text with the same
to
head
tail
loop.