demo-var.c

FreeRTOS 是一个源码公开的免费的嵌入式实时操作系统

// DEFINING RAM VARIABLES

#pragma chip PIC18C252

bit bt;
char ga, c8;
uns24 ug24;

uns16 table1[3];

// a structure
struct {
  char b;
  char c;
} cgt;

// a typedef
typedef struct {
  uns16 ab;
  int tab[10];
  struct {
    uns8 l1;
    uns8 l2;
  } vx;
} Txx;

Txx ax, bx[2];


// RAMBANK definition
bank1 char a;

#pragma rambank 3
char m1;
bank0 char uu1;
int24 m2;

#pragma rambank -  // unbanked RAM
char yy;

#pragma rambank 1
char pp;
shrBank int16 ir;  // unbanked RAM


const char *pro[3];  // a table in RAM of pointers to 'const' data


// variables overlaying another variable or table
bit  ov0 @ bt;  // full overlay
char ov1 @ c8;  // full overlay
int8 ov2 @ c8;  // full overlay, different type
bit  ov3 @ ug24.23;           // partial overlay
uns16 uu16 @ ug24.high16;     // partial overlay
uns24 uu24 @ table1[1].high8; // partial overlay
char table2[5] @ table1[0];   // partial overlay



void main(void)
{
    cgt.c = 0;

    ov0 = 0;
    ov1 = 0;
    ov2 = 0;
    ov3 = 0;

    ug24 = 0;
    uu16 = 0;

    uu24 = 0;
    table1[2] = 0;
    table1[0] = 0;
    table2[0] = 0;
}