Syntax
' PBASIC library,
these routines were written for
ARMexpress,
and included for general reference
#include
<PULSE.bas>
' source in /Program Files/Coridium/BASIClib
FUNCTION PULSIN ( pin, level )
Description
Measure an input pulse on pin at
level, returning the value to variable.
The IO direction of
pin will be set to input.
If pin is already at level
when the function is called it will wait to a transition to the opposite level.
The function will wait 1 second for
pin to go to level. The length of time is measured in
microseconds(us). The minimum pulse that can be measured is 1
microseconds. If pin does not go to level or remains at level
longer than 1 second variable is set to 0.
Example
#include <PULSE.bas>
'Wait for pin 7 to go high
then low.
'Print the number of microseconds pin 7 was high.
tim =
PULSIN (7, 1)
PRINT "Pin 7 pulse high for "; tim; " us"
Differences from other BASICs
- no equivalent in Visual BASIC
- Times are measured in microseconds rather than CPU dependent ticks in
PBASIC
See also
