' some initial variables to play with
option explicit on
dim x0 = 10
dim x1 = 20
dim y0 = 5
dim y1 = 15


' graphing code here
do
'code to extract of modify your test data

' code to display graph
loop

'simulate code here to generate and update data for graph
settick 2000,gen_data ' every 2 seconds, generate interrupt


' Every 2 seconds, the Settick timer will interrupt and call
' this simple subroutine to check global variables x0 and y0 -
' if they are less than their maximum values, it will increment
' them by 1, if greater, it will reset them to their initial values
' - it is just sample values - they could be set to anything you want
sub gen_data
if x0 > 20 then
x0 = 10
else
x0 = x0 +1
endif
if y0 > 15 then
y0 = 5
else
y0 = y0 +1
endif
end sub