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extern _DATA_ACCESS int _SYSMEM_SIZE;
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#pragma DATA_SECTION(_sys_memory, ".sysmem")
far PACKET _sys_memory[1] = { ((size_t)&_SYSMEM_SIZE) - sizeof(PACKET), 0 };
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//stack.h
#ifndef STACK_H
#define STACK_H
#define STACK_CAPACITY 20//maximum size of stack
typedef int stackEle;
typedef struct
{
stackEle myArray[ STACK_CAPACITY ];
int myTop;
}stack;
//construct(initialize) an empty stack
stack *stack_init(void);
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