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<DIV class=tit>max7219 C语言驱动程序</DIV>
<DIV class=date>2009-02-17 11:32</DIV>
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<P>max7219 C语言驱动程序 <BR></P>
<P>//max7219 led drive program<BR>//for 51 mcu<BR>//designed by
zhaoliang<BR>//2005-6-12 13:52<BR>＃i nclude<reg51.h></P>
<P>/***********************************************************************/<BR>//common
part <BR>#define HIGH 1<BR>#define
LOW 0<BR>#define
TRUE 1<BR>#define
FALSE 0<BR>#define
ZERO 0 <BR>#define
MSB 0x80<BR>#define
LSB 0x01<BR>//max7219 part<BR>#define
DECODE_MODE 0x09 <BR>#define INTENSITY
0x0A <BR>#define SCAN_LIMIT 0x0B <BR>#define
SHUT_DOWN 0x0C <BR>#define DISPLAY_TEST 0x0F</P>
<P>//pin
defined<BR>/***********************************************************************/<BR>//change
this part at different board<BR>sbit LOAD=P1^2;
//MAX7219 Load-Data Input: rising edge
pin 12 <BR>sbit DIN=P1^1; //MAX7219 Serial-Data
Input: rising edge pin 1<BR>sbit CLK=P1^0;
//MAX7219 Serial-Clock Input: maximum 10MHz pin 13</P>
<P>//function
define<BR>/***********************************************************************/<BR>void
Write_Max7219_byte(unsigned char temp);//write max7219 a byte<BR>void
Write_Max7219(unsigned char address,unsigned char dat);//write max7219
command and data<BR>void Init_Max7219(void);//Initize max7219</P>
<P>//test program display from
1~8<BR>/***********************************************************************/<BR>void
main(void)<BR>{<BR>unsigned char i; <BR>Init_Max7219();
<BR>while(TRUE)<BR>{ <BR>for(i=1;i<9;i++) <BR>{<BR>
Write_Max7219(i,i);<BR>}<BR>}
<BR>}<BR>/***********************************************************************/<BR>void
Write_Max7219_byte(unsigned char temp)<BR>{<BR>unsigned char i;<BR>for
(i=0;i<8;i++) <BR>{ <BR>
CLK=LOW;<BR>
DIN=(bit)(temp&MSB);
<BR> temp<<=1; <BR>
CLK=HIGH;<BR>
}<BR>}<BR>/***********************************************************************/<BR>void
Write_Max7219(unsigned char address,unsigned char dat)<BR>{
<BR>LOAD=LOW;<BR> Write_Max7219_byte(address);
<BR>
Write_Max7219_byte(dat);<BR>LOAD=HIGH;
<BR>}<BR>/***********************************************************************/<BR>void
Init_Max7219(void) <BR>{
<BR>Write_Max7219(SHUT_DOWN, 0x01); //Normal Operation
XXXXXXX1 Shutdown Mode
XXXXXXXX0<BR>Write_Max7219(DISPLAY_TEST, 0x00); //Normal
Operation XXXXXXX0 Display Test Mode
XXXXXXXX1<BR>Write_Max7219(DECODE_MODE, 0xff); //Decode Mode
Select D7~D0 1 B decode 0 No decode <BR>Write_Max7219(SCAN_LIMIT,
0x07); //SCAN LIMIT 0~7 0xX0~0xX7<BR>Write_Max7219(INTENSITY,
0x04); //Set Intensity
0xX0~0xXf<BR>}</P></DIV></TD></TR></TBODY></TABLE><BR>
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