Parallax Boe-Bot Student Manual page 166

Page 152 · Robotics with the Boe-Bot
Now the direction instructions will appear in a more familiar format shown in Figure 4-8.
Instead of ASCII codes, they appear as the actual characters you recorded using the
directive.
This program stored a total of 10 characters in EEPROM. These ten characters were
accessed by the command's
READ
as a byte, so it can access up to 256 locations, well over the 10 we needed. If the
variable is re-declared to be a word variable, you could theoretically access up
address
to 65535, far more locations than are available. Keep in mind that if your program gets
larger, the number of available EEPROM addresses for holding data gets smaller.
You can modify the existing data string to a new set of directions. You can also add
additional statements. The data is stored sequentially, so the first character in the
DATA
second data string will get stored immediately after the last character in the first data
string.
√
Try changing, adding, and deleting characters in the
running the program. Remember that the last character in the
should always be a "Q."
√
Modify the
DATA
left-right-backward sequence of movements.
√
Try adding a second
of the first
DATA
program will execute only the commands in the first
variable. The
address
directive to make your Boe-Bot perform the familiar forward-
directive. Remember to remove the "Q" from the end
DATA
directive and add it to the end of the second. Otherwise, the
Figure 4-8
Close-up of the
Detailed
EEPROM Map
after Display
ASCII Box is
Checked
variable was declared
address
directive, and re-
DATA
directive
DATA
directive.
DATA
DATA