PIC16F84A help????

Question

hey guys i need to make an instructions using interrupt at Rb0...i need to make 3 types of LED patterns(7 LEDs)..everytime te button is pressed the program must goto the next pattern if not it will continue executing the previous pattern...any idea?thanks

Answer 1

set up a counter in the interrupt and increment it every time you get a interrupt. when you hit 3, reset it back to 0. then based on the counter number, output the LED pattern.

pseudocode assuming the switch is causing the interrupt:

rb0 interrupt
increment pattern byte
if pattern = 3
pattern = 0
if pattern = 0
output LED pattern 0
else if pattern = 1
output LED pattern 1
else
output LED pattern 2

end of interrupt