max7219.h

断电不丢失秒表

#define uchar unsigned char
#define DECORD_MODE   0x09
#define INTENSITY     0x0A 
#define SCAN_LIMIT    0x0B 
#define SHUT_DOWN     0x0C 
#define DISPLAY_TEST  0x0F 
uchar code table[]={0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0x0f};
uchar code select[]={0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8};
sbit din=P2^0;
sbit load=P2^1;
sbit clk=P2^2;
void send_all(uchar adds, uchar date);
void max_ini();
void display(uchar *str,uchar length);
void send_word(uchar temp);


void send_word(uchar temp)
{
	uchar i;
	for(i=0;i<8;i++)
	{
		clk=0;
		din=temp&0x80;
		temp=temp<<1;
		clk=1;
	}
}
void send_all(uchar adds,uchar date)
{
	load=0;
	send_word(adds);
	send_word(date);
	load=1;
}
void max_ini()
{
	send_all(DECORD_MODE,0xff);
	send_all(INTENSITY,0x0f);
	send_all(SCAN_LIMIT,0x07);
	send_all(SHUT_DOWN,0x01);
	send_all(DISPLAY_TEST,0x0);

}


void display(uchar *str,uchar length)
{
	uchar t;
	for(t=0;t<8;t++)
		{
			if(t<length) 
			{
			send_all(select[t],table[str[t]]);
		
			}
			else 
			{
				send_all(select[t],0x0f);	
			}
		}
}