Some PIC Programming Problems!!!
Supose we have declared some variables in a cblock that starts at
location x20. We hav declared variables (registers) called Count1,
Count2 and Count3
Write a PIC 16F628 code fragment that will accomplish the following:
1) If (Count1==0)
Then call is_zero
Else call is_not_zero
2) If (Count1>=Count2)
Then call Count1_bigger
Else call Count2_bigger
3) Polling a pin
Suppose pin B0 is set to be an input pin. It
is normally set to zero, but occassionally will go high to 1. When it
goes high to 1, we wish to call
a subroutine called went_high.
while( pin B0==0); <----
this is called "polling a pin" . while it is zero, keep checking, when
it turns to 1, exit loop
4) This is a two part question.
a) Pins B0,B1,B2 and B3 are set for input. We wish to check each pin in the order specified. If the value of the pin is zero, call
is_zero and if the value of the pin in one, call is_one.
b) Your answer to part a probably has much repetitive code. Rewrite and eliminate the repetive code!
for (pin=B0 ; while pin<=B3; pin ++)