HD7279芯片程序.doc

/*/ /* */ /* S A G E T E C H . P R O P R I E T A R Y */ /* */ /* COPYRIGHT (c) 2005 BY SAGE TECH. CHINA. */ /* - ALL RIGHTS RESERVED - */ /* */ /* File Name: HD7279Atest.c */ /* Author: sagestar */ /* Created: 2005 */ /* Modified: no */ /* Revision: V1.0 */ /*/ /*程式作用：测试Sage Tech.研发板（MCP300）中hd7279键盘显示芯片是否能正常工作 */ /*程式功能：按下1号键显示0、1、2、3，按下2号键显示c、d、e、f，按下3号键显示4、5、6、7 */ /* 按下4号键显示8、9、a、b，按下0号键点亮4个LED灯 */ /*/ #include /*定义头文档*/ /*/ typedef unsigned char BYTE; /*自定义字节类型*/ /*/ #define Set_Bit(BIT) (BIT = 1) /*定义置1函数*/ #define Clear_Bit(BIT) (BIT = 0) /*定义清0函数*/ /*/ void Led_On(BYTE); /*定义点亮LED灯函数*/ void Led_Off(BYTE); /*定义熄灭LED灯函数*/ void Write_Hd7279(BYTE,BYTE); /*定义HD7279写函数*/ BYTE Read_Hd7279(BYTE); /*定义HD7279读函数*/ void Send_Byte(BYTE); /*定义HD7279发送字节函数*/ BYTE Receive_Byte(void); /*定义HD7279接收字节函数*/ void Short_Delay(void); /*定义短延时函数*/ void Long_Delay(void); /*定义长延时函数*/ void Mcu_Init(void); /*定义MCU初始化函数*/ void Delay_200_mS(void); /*定义200ms延时函数*/ /*/ BYTE Keyboard_Out; /*定义键值变量*/ bit Keyboard_Flag; /*定义按键标志*/ /*/ sbit Hd7279_Key=P32; /*定义HD7279中断硬件连接*/ sbit Hd7279_Clk=P21; /*定义HD7279时钟硬件连接*/ sbit Hd7279_Data=P20; /*定义HD7279数据硬件连接*/ /*/ void main(void) /*主函数*/ Mcu_Init(); /*MCU初始化*/ while(1) if(Keyboard_Flag) Clear_Bit(Keyboard_Flag); if(Keyboard_Out=0) /*0号键处理*/ Led_On(0x00); Led_On(0x01); Led_On(0x02); Led_On(0x03); else if(Keyboard_Out=1) /*1号键处理*/ /*显示0、1、2、3*/ Write_Hd7279(0xc9,0x03); Write_Hd7279(0xca,0x02); Write_Hd7279(0xcb,0x01); Write_Hd7279(0xcc,0x00); Led_Off(0x02); else if(Keyboard_Out=2) /*2号键处理*/ /*显示c、d、e、f*/ Write_Hd7279(0xc9,0x0f); Write_Hd7279(0xca,0x0e); Write_Hd7279(0xcb,0x0d); Write_Hd7279(0xcc,0x0c); Led_Off(0x02); else if(Keyboard_Out=3) /*3号键处理*/ /*显示4、5、6、7*/ Write_Hd7279(0xc9,0x07); Write_Hd7279(0xca,0x06); Write_Hd7279(0xcb,0x05); Write_Hd7279(0xcc,0x04); Led_Off(0x02); else /*4号键处理*/ /*显示8、9、a、b*/ Write_Hd7279(0xc9,0x0b); Write_Hd7279(0xca,0x0a); Write_Hd7279(0xcb,0x09); Write_Hd7279(0xcc,0x08); Led_Off(0x02); Delay_200_mS(); /*/ void Delay_200_mS(void) /*500ms延时函数*/ BYTE i,j; i=200; while (i-) j=228; while(j-); /*/ void Mcu_Init(void) /*MCU初始化函数*/ Set_Bit(EX0); /*外部中断0使能*/ Set_Bit(IT0); /*外部中断0下降沿触发*/ Set_Bit(EA); /*中断使能*/ Send_Byte(0xa4); /*HD7279复位*/ Write_Hd7279(0x98,0x1f); /*HD7279启动消隐功能，能提高灯的亮度*/ Write_Hd7279(0xc9,0x03); /*上电显示6、5、4、3*/ Write_Hd7279(0xca,0x04); Write_Hd7279(0xcb,0x05); Write_Hd7279(0xcc,0x06); /*/ void int1_Hd7279key(void) interrupt 0 /*外部中断0函数*/ Keyboard_Out=Read_Hd7279(0x15); /*读取键值*/ if(Keyboard_Out=0x04) Set_Bit(Keyboard_Flag); /*配置键标志*/ /*/ void Short_Delay(void) /*短延时函数*/ BYTE i; for(i=0;i0x08;i+); /*/ void Long_Delay(void) /*长延时函数*/ BYTE i; for(i=0;i0x30;i+); /*/ void Led_On(BYTE Led_Num) /*点亮LED灯函数*/ Write_Hd7279(0xe0,Led_Num); /*/ void Led_Off(BYTE Led_Num) /*熄灭LED灯函数*/ Write_Hd7279(0xc0,Led_Num); /*/ void Write_Hd7279(BYTE Command,BYTE Data) /*HD7279写函数*/ Send_Byte(Command); Send_Byte(Data); /*/ BYTE Read_Hd7279(BYTE Command) /*HD7279读函数*/ Send_Byte(Command); return(Receive_Byte(); /*/ void Send_Byte(BYTE Data_Out) /*HD7279发送字节函数*/ BYTE i; Long_Delay(); for(i=0;i8;i+) if(Data_Out&0x80) Set_Bit(Hd7279_Data); else Clear_Bit(Hd7279_Data); Set_Bit(Hd7279_Clk); Short_Delay(); Clear_Bit(Hd7279_Clk); Short_Delay(); Data_Out=Data_Out1; Clear_Bit(Hd7279_Data); /*/ BYTE Receive_Byte(void) /*HD7279接收字节函数*/ BYTE i,Data_In; Set_Bit(Hd7279_Data); Long_Delay(); for(i=0;i8;i+) Set_B