A couple of newbie questions

Andy_F

Sorry if these have been asked and answered before, but I couldn't find them.

I am not new to microcontrollers, but new to the propeller, so here goes:

1. On the MCU's I am familiar with, you have to set a register to enable weak pull-up resistors on inputs.
Am I right in assuming the Propeller does this automatically when you set a pin as an input? Or am
I missing something?

2. I know that I can check if an input is low by:

IF not INA[noparse][[/noparse]pin]
(do something)

But, how do you check if the pin is high? Is it:

IF INA[noparse][[/noparse]pin]
(do something)

or is it:

IF INA[noparse][[/noparse]pin] == 1
(do something)

Or am I completley out to lunch here?

Thanks for any assistance on this.

Andy

Mike Green

1) There are no weak pullups, so there's no way to enable them. You need external pullups when you require pullups

2) The IF statement uses zero for false and non-zero for true, so either 'INA[noparse][[/noparse]pin]' or 'INA[noparse][[/noparse]pin] == 1' will work

Andy_F

Mike Green said...
1) There are no weak pullups, so there's no way to enable them. You need external pullups when you require pullups

Hmm, that complicates things a little, but I can manage.


Thanks for the information Mike!