CCS C Compiler Manual PCB / PCM / PCH

Built-in Functions
Note: If the state is set to 1 while a key is being pressed, the touchpad
will not calibrate properly.
Availability:
Requires:
Examples:
Example Files:
All PIC's with a CSM Module
#USE TOUCHPAD (options)
#USE TOUCHPAD (THRESHOLD=5, PIN_D5='5', PIN_B0='C')
void main(void){
char c;
TOUCHPAD_STATE(1); //calibrates, then enters normal state
enable_interrupts(GLOBAL);
while(1){
c = TOUCHPAD_GETC();
//will wait until one of declared pins is detected
}
//if PIN_B0 is pressed, c will get value 'C'
} //if PIN_D5 is pressed, c will get value '5'
None
Also See: #USE TOUCHPAD, touchpad_getc( ), touchpad_hit( )
tolower( ) toupper( )
Syntax:
Parameters:
Returns:
Function:
result = tolower (cvalue)
result = toupper (cvalue)
cvalue is a character
An 8 bit character
These functions change the case of letters in the alphabet.
TOLOWER(X) will return 'a'..'z' for X in 'A'..'Z' and all other characters are
unchanged. TOUPPER(X) will return 'A'..'Z' for X in 'a'..'z' and all other
characters are unchanged.
Availability:
Requires:
All devices.
Nothing
Examples:
switch( toupper(getc()) ) {
case 'R' : read_cmd(); break;
case 'W' : write_cmd(); break;
case 'Q' : done=TRUE; break;
}
Example Files:
ex_str.c
327