CH4524联共阴极LED数码管C程序

/* ***********************************************************************CH452的4线接法驱动4联共阴极LED数码管KeilC程序Author: 王虎 2008.3.11单片机：89S52 晶振：11.0592MCH45X的4线接口，本电路中未接键盘扫描，接4位数码管，DOUT悬空，不含按键中断为3个I/O引脚。****************************************************************************/#include <regx51.h>#include <ch452cmd.h> // CH452常量定义#include <intrins.h>/***********CH452与单片机接线方式************/sbit   CH452_DCLK=P1^7;                     // 串行数据时钟上升延激活sbit   CH452_DIN=P1^6;                  // 串行数据输出，接CH452的数据输入sbit   CH452_LOAD=P1^5;                     // 串行命令加载，上升延激活//sbit   CH452_DOUT=P3^3;                     // INT1，键盘中断和键值数据输入，接CH452的数据输出 /******** 4线接口的位操作,与单片机有关 *********/#define   CH452_DCLK_SET   {CH452_DCLK=1;}#define   CH452_DCLK_CLR   {CH452_DCLK=0;}#define   CH452_DIN_SET   {CH452_DIN=1;}#define   CH452_DIN_CLR   {CH452_DIN=0;}#define   CH452_LOAD_SET   {CH452_LOAD=1;}#define   CH452_LOAD_CLR   {CH452_LOAD=0;}/******* 延时1uS子程序,主要用于2线接口,与单片机速度有关 ********///#define   DELAY_1US {}          // MCS51<=10MHz#define   DELAY_1US   {_nop_();}      // MCS51<=20MHz//#define   DELAY_1US {_nop_();_nop_();} // MCS51<=30MHz/**************写12bit控制字函数*******************/void CH452_Write(unsigned short cmd){unsigned char i;CH452_LOAD_CLR;            //命令开始,LOAD=0for(i=0;i!=12;i++)    //送入12位数据，低位在前{//   if (cmd&1) {CH452_DIN_SET;}//   else {CH452_DIN_CLR;} // 输出位数据      CH452_DCLK_CLR;    CH452_DIN=cmd&1;        CH452_DCLK_SET;             //上升沿有效        cmd=cmd>>1;}CH452_LOAD_SET;         //加载数据,LOAD上升沿DELAY_1US;     //命令数据加载周期不小于6US,CH451不需要该周期DELAY_1US;DELAY_1US;}/******************主函数******************************/void main(){CH452_Write(CH452_RESET);CH452_Write(CH452_BCD + 0x40);    // 选择BCD译码方式,扫描极限为4个数码管CH452_Write(CH452_SYSON1);     // 开启显示while (1){CH452_Write(CH452_DIG3 | 1);CH452_Write(CH452_DIG2 | 2);CH452_Write(CH452_DIG1 | 3);CH452_Write(CH452_DIG0 | 4); // 4位数码管显示字符1234 // CH452_Write(CH452_RIGHTCYC);}}