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PCD
Multiple Compilation Units
Traditionally, the CCS C compiler used only one compilation unit and multiple files
were implemented with #include files. When using multiple compilation units, care
must be given that pre-processor commands that control the compilation are
compatible across all units. It is recommended that directives such as #FUSES,
#USE and the device header file all put in an include file included by all units. When
a unit is compiled it will output a relocatable object file (*.o) and symbol file (*.osym).
There are several ways to accomplish this with the CCS C Compiler. All of these
methods and example projects are included in the MCU.zip in the examples
directory of the compiler.
Example
Here is a sample program with explanation using CCS C to read adc samples over rs232:
///////////////////////////////////////////////////////
///
///
///
This program displays the min and max of 30,
comments that explains what the program does,
and A/D samples over the RS-232 interface.
///
///
///
///////////////////////////////////////////////////////
#include <16F887.h>
PIC16F887
#fuses NOPROTECT
#use delay(crystal=20mhz)
// preprocessor directive that selects the chip
// Code protection turned off
// preprocessor directive that specifies the clock
type and speed
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // preprocessor directive that
includes the
// rs232 libraries
void main() {
int i, value, min, max;
printf("Sampling:");
the RS232 library
setup_port_a( ALL_ANALOG );
in
setup_adc( ADC_CLOCK_INTERNAL );
set_adc_channel( 0 );
do {
min=255;
max=0;
for(i=0; i<=30; ++i) {
delay_ms(100);
second
value = Read_ADC();
in
if(value<min)
min=value;
if(value>max)
max=value;
}
// main function
// local variable declaration
// printf function included in
// A/D setup functions- built-
// Internal clock always works
// Set channel to AN0
// do forever statement
// Take 30 samples
// Wait for a tenth of a
// A/D read functions- built-
// Find smallest sample
// Find largest sample
}
12
printf("\n\rMin: %2X
} while (TRUE);
Max: %2X\n\r",min,max);
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