CCS C Compiler Manual PCB / PCM / PCH

}
}
}
output_toggle(PIN_B0);
previous_tick = current_tick;
Example
Files:
Also See:
None
get_ticks(), set_ticks()
#use touchpad
Syntax:
Elements:
#USE TOUCHPAD (options)
RANGE=x
Sets the oscillator charge/discharge current range. If x is L, current is nominally
0.1 microamps. If x is M, current is nominally 1.2 microamps. If x is H, current is
nominally 18 microamps. Default value is H (18 microamps).
THRESHOLD=x
x is a number between 1-100 and represents the percent reduction in the nominal
frequency that will generate a valid key press in software. Default value is 6%.
SCANTIME=xxMS
xx is the number of milliseconds used by the microprocessor to scan for one key
press. If utilizing multiple touch pads, each pad will use xx milliseconds to scan for
one key press. Default is 32ms.
PIN=char
If a valid key press is determined on “PIN”, the software will return the character
“char” in the function touchpad_getc(). (Example: PIN_B0='A')
SOURCETIME=xxus (CTMU only)
xx is thenumber of microseconds each pin is sampled for by ADC during each
scan time period. Default is 10us.
Purpose:
This directive will tell the compiler to initialize and activate the Capacitive Sensing
Module (CSM)or Charge Time Measurement Unit (CTMU) on the microcontroller.
The compiler requires use of the TIMER0 and TIMER1 modules for CSM and
Timer1 ADC modules for CTMU, and global interrupts must still be activated in
the main program in order for the CSM or CTMU to begin normal operation. For
most applications, a higher RANGE, lower THRESHOLD, and higher SCANTIME
will result better key press detection. Multiple PIN's may be declared in “options”,
but they must be valid pins used by the CSM or CTMU. The user may also
generate a TIMER0 ISR with TIMER0's interrupt occuring every SCANTIME
milliseconds. In this case, the CSM's or CTMU's ISR will be executed first.
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