ram.c

来自「8051带32Mflash的源代码」· C语言 代码 · 共 60 行

#include"RAM_H.H"

void ram_init(void)
{	AUXR=0x00;
}

void ram_cs(bit flag)
{	if(flag==0)
	{	P40=1;
		P41=1;
		P42=0;
	}
	else
	{	P40=1;
		P41=1;
		P42=1;		
	}
	
}

void ram_write_byte(uchar xdata *addr,uchar value)
{	uchar xdata *p;
	p=addr;
	ram_cs(0);
	*p=value;
	ram_cs(1);
}

void ram_write_word(uchar xdata *addr,uint value)
{	uchar xdata *p;
	p=addr;
	ram_cs(0);
	*p=(uchar)(value>>8);
	*(p+1)=(uchar)value;
	ram_cs(1);

	
}

uchar ram_read_byte(uchar xdata *addr)
{	uchar xdata *p,value;
	p=addr;
	ram_cs(0);
	value=*p;
	ram_cs(1);
	return(value);
}

uint ram_read_word(uchar xdata *addr)
{	uchar xdata *p;
	uint value=0;
	p=addr;
	ram_cs(0);
	value=((value+*p)<<8)+*(p+1);
	ram_cs(1);
	return(value);
}