Mosaic
Well-Known Member
Hi folks:
Just getting going with the Basic compiler in the latest PIC simulator and this command:
GPIO=GPIO+1 does not work in simulation (12f675, 4Mhz)
but if I use a byte dimensioned 'buffer' variable like:
buffer=buffer+1
GPIO=buffer
all is well. On using the BREAK and stepping, I can see the asm command reading from the GPIO (GPR 0x05) always reads a zero, even if the GPIO holds another value.
The strange thing is the examples given in the basic compiler manual seem to assume that GPIO=GPIO+1 will work. This has implications for Conditional logic that must read from the ports etc.
Can anyone explain what is going on?
Answer:
Ok, 12f675 needs to have it's analog comparator off to get GPIO. Also GP3 is ALWAYS an input.
These two additional cmds are necessary.
CMCON = 0x07
ANSEL = 0
Just getting going with the Basic compiler in the latest PIC simulator and this command:
GPIO=GPIO+1 does not work in simulation (12f675, 4Mhz)
but if I use a byte dimensioned 'buffer' variable like:
buffer=buffer+1
GPIO=buffer
all is well. On using the BREAK and stepping, I can see the asm command reading from the GPIO (GPR 0x05) always reads a zero, even if the GPIO holds another value.
The strange thing is the examples given in the basic compiler manual seem to assume that GPIO=GPIO+1 will work. This has implications for Conditional logic that must read from the ports etc.
Can anyone explain what is going on?
Answer:
Ok, 12f675 needs to have it's analog comparator off to get GPIO. Also GP3 is ALWAYS an input.
These two additional cmds are necessary.
CMCON = 0x07
ANSEL = 0
Last edited:
