The basic framework of C language programming for PIC microcontroller

Introduction: The basic framework of C language programming for PIC microcontrollers

The basic method of writing PIC microcontroller programs based on the PICC compilation environment is similar to that of standard C programs. The program generally consists of the following main parts:

1. Use the #include preprocessing directive at the beginning of the program to reference the included header file, which must include a "pic.h" file provided by the compiler to declare special registers and other special symbols in the microcontroller;

2. Use the "_CONFIG" preprocessor directive to define the chip's configuration bits;

3. Declare the types of all functions called in this module. PICC will perform strict type matching checks on the called functions.

4. Define global variables or symbol replacement;

5. Implement the function (subroutine), paying special attention that the main function must be an infinite loop with no return.

The following is an example of a C program for your reference.

#include //Includes the predefined internal resources of the MCU

#include "pc68.h" //Include custom header file

//Define the configuration bits when the chip is working

__CONFIG(HS&PROTECT&PWRTEN&BOREN&WDTDIS);

//Declare the function type called in this module

voidSetSFR(void);

voidClock(void);

voidKeyScan(void);

voidMeasure(void);

voidLCD_Test(void);

voidLCD_Disp(unsignedchar);

//Define variables

unsignedcharsecond,minute,hour;

bitflag1,flag2;

// Functions and subroutines

voidmain(void)

{

SetSFR();

PORTC=0x00;

TMR1H+=TMR1H_CONST;

LED1=LED_OFF;

LCD_Test();

//Main loop of program work

while(1){

asm("clrwdt"); // clear watchdog

Clock(); //Update the clock

KeyScan(); //Scan the keyboard

Measure(); //Data measurement

SetSFR(); //Refresh special function registers

}

}