/* ***********************************************************************
CH452的4線接法驅(qū)動(dòng)4聯(lián)共陰極LED數(shù)碼管KeilC程序
Author: 王虎 2008.3.11
單片機(jī)：89S52
晶振：11.0592M
CH45X的4線接口，本電路中未接鍵盤掃描，接4位數(shù)碼管，DOUT懸空，不含按鍵中斷為3個(gè)I/O引腳。
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#include <regx51.h>
#include <ch452cmd.h> // CH452常量定義
#include <intrins.h>
/***********CH452與單片機(jī)接線方式************/
sbit CH452_DCLK=P1^7; // 串行數(shù)據(jù)時(shí)鐘上升延激活
sbit CH452_DIN=P1^6; // 串行數(shù)據(jù)輸出，接CH452的數(shù)據(jù)輸入
sbit CH452_LOAD=P1^5; // 串行命令加載，上升延激活
//sbit CH452_DOUT=P3^3; // INT1，鍵盤中斷和鍵值數(shù)據(jù)輸入，接CH452的數(shù)據(jù)輸出
/******** 4線接口的位操作,與單片機(jī)有關(guān) *********/
#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;}
/******* 延時(shí)1uS子程序,主要用于2線接口,與單片機(jī)速度有關(guān) ********/
//#define DELAY_1US {} // MCS51<=10MHz
#define DELAY_1US {_nop_();} // MCS51<=20MHz
//#define DELAY_1US {_nop_();_nop_();} // MCS51<=30MHz
/**************寫12bit控制字函數(shù)*******************/
void CH452_Write(unsigned short cmd)
{
unsigned char i;
CH452_LOAD_CLR; //命令開始,LOAD=0
for(i=0;i!=12;i++) //送入12位數(shù)據(jù)，低位在前
{
// if (cmd&1) {CH452_DIN_SET;}
// else {CH452_DIN_CLR;} // 輸出位數(shù)據(jù)
CH452_DCLK_CLR;
CH452_DIN=cmd&1;
CH452_DCLK_SET; //上升沿有效
cmd=cmd>>1;
}
CH452_LOAD_SET; //加載數(shù)據(jù),LOAD上升沿
DELAY_1US; //命令數(shù)據(jù)加載周期不小于6US,CH451不需要該周期
DELAY_1US;
DELAY_1US;
}
/******************主函數(shù)******************************/
void main()
{
CH452_Write(CH452_RESET);
CH452_Write(CH452_BCD + 0x40); // 選擇BCD譯碼方式,掃描極限為4個(gè)數(shù)碼管
CH452_Write(CH452_SYSON1); // 開啟顯示
while (1)
{
CH452_Write(CH452_DIG3 | 1);
CH452_Write(CH452_DIG2 | 2);
CH452_Write(CH452_DIG1 | 3);
CH452_Write(CH452_DIG0 | 4); // 4位數(shù)碼管顯示字符1234
// CH452_Write(CH452_RIGHTCYC);
}
}
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66821730(技術(shù)支持)
