7219.c

是MAX7219的驱动程序

#define _7219_CLOCK_DOWN() *_7219_PORT_DATA&=(_7219_CLOCK^0xffff)
#define _7219_CLOCK_UP() *_7219_PORT_DATA|=_7219_CLOCK
#define _7219_LOAD_DOWN() *_7219_PORT_DATA&=(_7219_LOAD^0xffff)
#define _7219_LOAD_UP() *_7219_PORT_DATA|=_7219_LOAD

#define CODE_MODE 0x0900
#define INTENSITY 0x0a00
#define SCAN_LIMIT 0x0b00
#define SHUT_DOWN 0x0c00
#define TEST 0xf00
#define BLANK 0xf

unsigned int *_7219_PORT_DATA;
unsigned int *_7219_PORT_ATRRIB;
unsigned int *_7219_PORT_DIR;

unsigned int _7219_CLOCK;
unsigned int _7219_DATA;
unsigned int _7219_LOAD;

unsigned int LED_data[10]={0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,0x7f,0x7b};
unsigned long int b[6]={1,10,100,1000,10000,100000};
volatile  unsigned int  *P_WatchDog_Clear = (unsigned int*)(0x7012); 

void Reverse(unsigned int *temp,unsigned int *array,unsigned int num)
{
	unsigned int i;
	for (i=1;i<=num;i++)
	{
		temp[i-1]=array[num-i];
	}
}

void send_data(unsigned int data)
{
	unsigned int i;
	_7219_LOAD_DOWN();
	*P_WatchDog_Clear=1;
	for(i=0;i<16;i++)
	{
		_7219_CLOCK_DOWN();
		if(data&0x8000) *_7219_PORT_DATA|=_7219_DATA;
		else *_7219_PORT_DATA&=(_7219_DATA^0xffff);
		_7219_CLOCK_UP();
		data<<=1;
	}
	_7219_LOAD_UP();
}

void ini_7219(char port,unsigned int data,unsigned int load,unsigned int clock,unsigned int lightness)
{
	if(port=='B'||port=='b') 
	{
		_7219_PORT_DATA=(unsigned int*)(0x7005);
		_7219_PORT_ATRRIB=(unsigned int*)(0x7008);
		_7219_PORT_DIR=(unsigned int*)(0x7007);
	}
	else 
	{
		_7219_PORT_DATA=(unsigned int*)(0x7000);
		_7219_PORT_ATRRIB=(unsigned int*)(0x7003);
		_7219_PORT_DIR=(unsigned int*)(0x7002);
	}
	_7219_CLOCK=clock;
	_7219_DATA=data;
	_7219_LOAD=load;
	*_7219_PORT_DIR|=(_7219_CLOCK|_7219_DATA|_7219_LOAD);
	*_7219_PORT_ATRRIB|=(_7219_CLOCK|_7219_DATA|_7219_LOAD);
	*_7219_PORT_DATA&=((_7219_CLOCK|_7219_DATA|_7219_LOAD)^0xffff);
	send_data(SHUT_DOWN|1);
	send_data(INTENSITY|lightness);
	send_data(CODE_MODE|0xff);
}

void show_array(unsigned int *data,unsigned int num,unsigned int dot,unsigned int reverse)
{
	int i;
	unsigned int temp[8];
	if(num>0)
	{
		if (reverse) Reverse(temp,data,num);
		else
		{
			for (i=0;i<num;i++) temp[i]=data[i];
		}
		send_data(SHUT_DOWN|1);
		send_data(SCAN_LIMIT|(num-1));
		if (!dot)
		{
			for(i=0;i<num;i++)
				send_data(((i+1)<<8)|temp[i]);
		}
		else
		{
			for(i=0;i<num;i++)
			{
				if (i==dot)
					send_data(((i+1)<<8)|temp[i]|128);
				else 
					send_data(((i+1)<<8)|temp[i]);
			}
		}
	}
	else 	send_data(SHUT_DOWN|0);
}

void IntToArray(unsigned int a,unsigned int *array,unsigned int *num)
{
	unsigned long int j=0;
	long int temp,i=1,c[5]={0,0,0,0,0};
	if (a==0)
	{
		array[0]=0;
		*num=1;
	}
	else
	{
	 	while(1)
	 	{
	 		i=b[j];
	 		if (i>a) break;
	 		j++;
		 }
		 for (i=j-1;i>=0;i--)
		 {
		 temp=a-c[3]-c[2]-c[1]-c[0]-c[4];
	 	c[i]=b[i];
	 	array[i]=1;
		 while(1)
	 	{
	 		if ((temp-c[i])<0) 
	 		{
	 			array[i]=0;
	 			c[i]=0;
	 		}
	 		if ((temp-c[i])<b[i]) break;
	 		c[i]+=b[i];
	 		array[i]++;
		 }
	 	}
	*num=j;
	}
}

void show_number(unsigned int data,unsigned int dot)
{
	unsigned int array[8]={0,0,0,0,0,0,0,0},num,i;
	IntToArray(data,array,&num);
	if (num<=dot)
		num=dot+1;
	show_array(array,num,dot,0);
}