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<DIV class=tit>MAX7219驱动程序</DIV>
<DIV class=date>2007-04-27 10:21</DIV>
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<P>/*****************************************************************
<BR>* 常用符号定义
<BR>******************************************************************/
<BR>#define uchar unsigned char
<BR>/******************************************************************
<BR>* 定义MAX7219寄存器
<BR>*******************************************************************/
<BR>#define REG_NO_OP 0x00 // 定义空操作 <BR>register #define DIG_1 0x01 //
定义数码管1 <BR>register #define DIG_2 0x02 // 定义数码管2 <BR>register #define
DIG_3 0x03 // 定义数码管3 <BR>register #define DIG_4 0x04 // 定义数码管4
<BR>register #define DIG_5 0x05 // 定义数码管5 <BR>register #define DIG_6 0x06
// 定义数码管6 <BR>register #define DIG_7 0x07 // 定义数码管7 <BR>register #define
DIG_8 0x08 // 定义数码管8 <BR>register #define REG_DECODE 0x09 // 定义解码控制
<BR>register #define REG_INTENSITY 0x0a // 定义显示亮度 <BR>register #define
REG_SCAN_LIMIT 0x0b // 定义扫描限制 <BR>register #define REG_SHUTDOWN 0x0c //
定义"shutdown"模式 <BR>register #define REG_DISPLAY_TEST 0x0f // 定义"display
test"模式 <BR>register #define INTENSITY_MIN 0x00 // 定义最低显示亮度 <BR>#define
INTENSITY_MAX 0x0f // 定义最高显示亮度</P>
<P>/*********************************************************************
<BR>* 定义硬件引脚连接
<BR>*********************************************************************/</P>
<P><BR>#define DATA P2^3; //定义P3_5连接MAX7219 DATA引脚 <BR>#define CLK P2^5;
//定义P3_4连接MAX7219 CLK 引脚 <BR>#define CS P2^4; //定义P3_3连接MAX7219 CS
引脚(实际按7221设)</P>
<P><BR>/***********************************************************************
<BR>* 共阴极七段数码管显示对应段查询表（数字0-9分别对应code_table[0]-[9]）</P>
<P>***********************************************************************/</P>
<P><BR>uchar code code_table[10]=
{0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,0x7f,0x7b};</P>
<P>/*采用数组*/</P>
<P>/***********************************************************************
<BR>* MAX7219_SendByte() * * 描述: 向MAX7219传送一字节数据 <BR>* Arguments : dataout
= data to send * Returns : none</P>
<P>*************************************************************************/</P>
<P><BR>void MAX7219_SendByte (uchar dataout) <BR>{<BR>char i; <BR>for
(i=8; i>0; i--) <BR>{ uchar mask = 1 << (i - 1); // 设置掩码
<BR>CLK=0; // CLK 置低 <BR>if (dataout & mask) // 判断并输出一位
<BR> DATA=1; // 输出"1" <BR>else // 或 <BR> DATA=0;
// "0" <BR> CLK=1; // CLK 置高 <BR>}<BR>}</P>
<P><BR>/***********************************************************************
<BR>* MAX7219_Write() * <BR>* 描述: 向 MAX7219 写命令 <BR>* Arguments :
reg_number = register to write to <BR>* dataout = data to write to MAX7219
<BR>* Returns : none
<BR>*************************************************************************/</P>
<P><BR>void MAX7219_Write (uchar reg_number, uchar dataout) <BR>{ CS=0; //
CS置低选通 MAX7219 M<BR>AX7219_SendByte(reg_number); // 写 register number 到
MAX7219 <BR>MAX7219_SendByte(dataout); // 写 data 到 MAX7219 <BR>CS=1; //
利用CS上升沿锁存以上移位进输入的16位数据 <BR>}</P>
<P><BR>/**************************************************************************
<BR>* MAX7219_DisplayChar() * <BR>* 描述: 使某一位显示一个数字 <BR>* Arguments : digit
= digit number (0-7) <BR>* character = character to display (0-9, A-Z)
<BR>* Returns : none
<BR>**************************************************************************/</P>
<P><BR>void MAX7219_DisplayChar (char digit, char character) <BR>{
<BR>MAX7219_Write(digit, character); <BR>}</P>
<P><BR>/**************************************************************************
<BR>* MAX7219_Clear() * * 描述: 清除所有位的显示 <BR>* Arguments : none * Returns :
none</P>
<P>***************************************************************************/
<BR>void MAX7219_Clear (void) <BR>{ <BR>uchar i; <BR>for (i=0; i < 8;
i++) <BR>MAX7219_Write(i, 0x00); // 清除所有位的显示 <BR>}</P>
<P><BR>/**************************************************************************
<BR>* MAX7219_SetBrightness() * <BR>* 描述: 设置数码管显示亮度 <BR>* Arguments :
brightness (0-15) <BR>* Returns : none</P>
<P><BR>***************************************************************************/</P>
<P><BR>void MAX7219_SetBrightness (char brightness) <BR>{ <BR>brightness
&= 0x0f; // 屏蔽高位字节 <BR>MAX7219_Write(REG_INTENSITY, brightness); //
设置数码管显示亮度
<BR>}<BR><BR>/**************************************************************************
<BR>* MAX7219_DisplayTestStart() * <BR>* 描述: 进入 test 模式 <BR>* Arguments :
none * Returns : none</P>
<P>***************************************************************************/
<BR>void MAX7219_DisplayTestStart (void) <BR>{
<BR>MAX7219_Write(REG_DISPLAY_TEST, 1); // 置 MAX7219 为 test 模式
<BR>}<BR>/**************************************************************************
<BR>* MAX7219_DisplayTestStop() * <BR>* 描述: 退出 test 模式 <BR>* Arguments :
none * Returns : none</P>
<P>***************************************************************************/
<BR>void MAX7219_DisplayTestStop (void) <BR>{
<BR>MAX7219_Write(REG_DISPLAY_TEST, 0); // 置 MAX7219 为正常显示模式
<BR>}<BR>/**************************************************************************
<BR>* MAX7219_ShutdownStart() * <BR>* 描述: 进入 shutdown 模式 <BR>* Arguments :
none <BR>* Returns :
none<BR>***************************************************************************/
<BR>void MAX7219_ShutdownStart (void) <BR>{
<BR>MAX7219_Write(REG_SHUTDOWN, 0); // 置 MAX7219 为 shutdown 模式 <BR>}
<BR>/**************************************************************************
<BR>* MAX7219_ShutdownStop() * <BR>* 描述: 退出 shutdown 模式 <BR>* Arguments :
none <BR>* Returns : none</P>
<P><BR>***************************************************************************/
<BR>void MAX7219_ShutdownStop (void) <BR>{ MAX7219_Write(REG_SHUTDOWN, 1);
// 置 MAX7219 为正常显示模式 }</P>
<P></P>
<P>/**************************************************************************
<BR>* MAX7219_Init() * <BR>* Des cription: MAX7219初始化模块;
应该先于其他MAX7219函数而被调用 <BR>* Arguments : none * Returns : none</P>
<P>***************************************************************************/
<BR>void MAX7219_Init (void) <BR>{ <BR>DATA=1; // 置DATA为1 <BR>CLK=1;
// 置CLK 为1 <BR>CS=1; // 置CS 为1
<BR>MAX7219_Write(REG_SCAN_LIMIT, 7); // 设置为全显示
<BR>MAX7219_Write(REG_DECODE, 0x00); // 所有位设置为非解码方式
<BR>MAX7219_ShutdownStop(); // 置 MAX7219 为正常显示模式
(非shutdown模式) <BR>MAX7219_DisplayTestStop(); // 置
MAX7219 为正常显示模式 (非test模式) <BR>MAX7219_Clear();
// 清除所有位的显示
<BR>MAX7219_SetBrightness(INTENSITY_MAX); // 置最大亮度 <BR>}</P>
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