CCS C Compiler Manual PCB / PCM / PCH

ex_usb_serial.c The CDC virtual RS232 library is demonstrated with this RS232 < - >
USB example.
ex_usb_serial2.c
Another CDC virtual RS232 library example, this time a port of the
ex_intee.c example to use USB instead of RS232.
Voltage Reference
These functions configure the votlage reference module. These are available only in the
supported chips.
Relevant Functions:
setup_vref(mode | value)
Relevant Preprocesser:
none
Enables and sets up the internal voltage reference value.
Constants are defined in the device's .h file.
Relevant Interrupts:
none
Relevant Include Files:
none, all functions built-in
Relevant getenv() parameters:
VREF
Returns 1 if the device has VREF
Example code:
for PIC12F675
#INT_COMP //comparator interrupt handler
void isr() {
safe_conditions = FALSE;
printf("WARNING!!!! Voltage level is above
3.6V. \r\n");
}
setup_comparator(A1_VR_OUT_ON_A2)//sets 2
comparators(A1 and VR and A2 as output)
{
setup_vref(VREF_HIGH | 15);//sets 3.6(vdd *
value/32 + vdd/4) if vdd is 5.0V
enable_interrupts(INT_COMP); // enable the
comparator interrupt
enable_interrupts(GLOBAL); //enable global
interrupts
}
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