Програмирование PIC

// PIC16F876 Configuration Bit Settings
 
// 'C' source line config statements
 
// CONFIG
#pragma config FOSC = EXTRC     // Oscillator Selection bits (RC oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config CP = OFF         // FLASH Program Memory Code Protection bits (Code protection off)
#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = ON         // Low Voltage In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming enabled)
#pragma config CPD = OFF        // Data EE Memory Code Protection (Code Protection off)
#pragma config WRT = OFF         // FLASH Program Memory Write Enable (Unprotected program memory may be written to by EECON control)
 
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
 
#include <xc.h>
#include <PIC16F876.h>
 
#include <stdio.h>
 
#include <string.h>
 
#include <stdlib.h>
 
 
 
#define BUF_SIZE 64
 
char Buffer[BUF_SIZE + 1];
 
char CurChar, CurPos, i;
 
char bExit;
 
void TranslateCommand() {
 
    if (strstr(Buffer, "help ")) {
 
        printf("Terminal system v1.0\n");
 
        printf("Type \'mpl x*y\' to multiply x and y.\n");
 
        printf("Type \'exit\' to exit from terminal.\n");
 
    } else if (strstr(Buffer, "exit")) {
 
        printf("Exit from program.\n");
 
        bExit = 1;
 
    } else if (strstr(Buffer, "mpl ")) {
 
        unsigned int a1 = 0, a2 = 0, mpl = 0;
 
        char * ptr;
 
        ptr = strtok(Buffer, " *");
 
        if (ptr != NULL) {
 
            ptr = strtok(NULL, " *");
 
            if (ptr != NULL) {
 
                a1 = atoi(ptr);
 
                ptr = strtok(NULL, " *");
 
                if (ptr != NULL) {
 
                    a2 = atoi(ptr);
 
                }
 
            }
 
        }
 
        mpl = a1 * a2;
 
        printf("Multiply = %d\n", mpl);
 
    } else {
 
        printf("Unknown command: \'%s\'\n", Buffer);
 
    }
 
}
 
void putch(unsigned char byte) {
 
    while (!TXIF);
 
    TXREG = byte;
 
}
 
unsigned char getch() {
 
    while (!RCIF);
 
    return RCREG;
 
}
 
unsigned char getche(void) {
 
    unsigned char c;
 
    putch(c = getch());
 
    return c;
 
}
 
void main() {
 
    BRGH = 1;
 
    SPBRG = 25;
 
    SPEN = 1;
 
    TXEN = 1;
 
    CREN = 1;
 
    printf("\ Program started.\n");
 
    CurPos = 0;
 
    Buffer[0] = 0;
 
    bExit = 0;
 
    while (bExit == 0) {
 
        CurChar = getche();
 
        if (CurChar == '\n') {
 
            TranslateCommand();
 
            CurPos = 0;
 
            Buffer[0] = 0;
 
        } else {
 
            Buffer[CurPos] = CurChar;
 
            CurPos++;
 
            Buffer[CurPos] = 0;
 
            if (CurPos == BUF_SIZE) {
 
                for (int i = 1; i <= BUF_SIZE; ++i) {
 
                    Buffer[i - 1] = Buffer[i];
 
                }
 
                CurPos--;
 
            }
 
        }
 
    }
 
    printf("Program finished.\n");
 
    while (1);
 
}