有关7279键盘驱动芯片程序C语言

默认11.0592Mhz的晶振。

—————————————————————*/

#include <reg51.h>

/*--------------------------------------------

调用方式：自行I/O 口定义﹫2001/05/12

函数说明：私有函数，各接口定义

--------------------------------------------*/

sbit HD7279_CS=P1^4// HD7279_CS--P1.4

sbit HD7279_CLK=P1^5// HD7279_CLK-- P1.5

sbit HD7279_DATA=P1^6// HD7279_DATA-- P1.2

sbit HD7279_KEY =P1^7// HD7279_KEY-- P1.3

/*--------------------------------------------

调用方式： HD7279A 各指令定义﹫2001/05/12

函数说明：私有函数，接口定义

--------------------------------------------*

/#define HD7279_RESET 0xa4 //复位

#define HD7279_TEST 0xbf //测试

#define HD7279_RLC 0xa3 //循环左移

#define HD7279_RRC 0xa2 //循环右移

#define HD7279_RL 0xa1 //左移

#define HD7279_RR 0xa0 //右移

#define HD7279_DECODE0 0x80 //译码方式0

#define HD7279_DECODE1 0xc8 //译码方式1

#define HD7279_UNDECODE 0x90 //译码方式2: 不译码

#define HD7279_HIDE 0x98 //消隐

#define HD7279_FLASH 0x88 //闪烁

#define HD7279_SEGON 0xe0 //段亮

#define HD7279_SEGOFF 0xc0 //段灭

#define HD7279_READ 0x15 //读

/*--------------------------------------------

调用方式： void HD7279_LongDelay(void) 等侍函数﹫2001/05/12

函数说明 私有函数，>500ms

--------------------------------------------*/

void HD7279_LongDelay(void)

{

unsigned char i

for (i=0i<6i++)

}

/*--------------------------------------------

调用方式：void HD7279_ShortDelay(void) 等侍函数﹫2001/05/12

函数说明：私有函数，=500ms

--------------------------------------------*

/void HD7279_ShortDelay(void)

{}

/*--------------------------------------------

调用方式：void Delay10ms(unsigned char time) 等侍函数﹫2001/05/12

函数说明：私有函数， 6M晶振

--------------------------------------------*/

void Delay10ms(unsigned char time)

{

unsigned char i

unsigned int j

for(i=0i<timei++)

{

for(j=0j<931j++)

{}

}

}

/*--------------------------------------------

调用方式：void HD7279_ShortDelay(void) 函数﹫2001/05/12

函数说明：私有函数，送指令

--------------------------------------------*/

void HD7279_SendByte( unsigned char out_byte)

{

unsigned char i

HD7279_CS=0

HD7279_LongDelay()

for(i=0i<8i++)

{

if(out_byte&0x80) { HD7279_DATA=1}

else { HD7279_DATA=0}

HD7279_CLK=1

HD7279_ShortDelay()

HD7279_CLK=0

HD7279_ShortDelay()

out_byte=out_byte<<1

}

HD7279_DATA=0

}

/*--------------------------------------------

调用方式：void Write7279(unsigned char command,unsigned char dta) 函数﹫2001/05/12

函数说明：私有函数，写函数

--------------------------------------------*/

void Write7279(unsigned char command, unsigned char dta)

{

HD7279_SendByte( command )

HD7279_SendByte( dta )

}

/*--------------------------------------------

调用方式：自定义函数﹫2001/05/12

函数说明：私有函数，自行定义

--------------------------------------------*/

#define RunKey 0xXX

#define StopKey 0xXX

/*--------------------------------------------

调用方式：unsigned charHD7279_ReceiveByte(void)函数﹫2001/05/12

函数说明：私有函数，接受一个BYTE函数

--------------------------------------------*/

unsigned char HD7279_ReceiveByte(void)

{

unsigned char i, in_byte

HD7279_DATA=1

HD7279_LongDelay()

for(i=0i<8i++)

{HD7279_CLK=1<br>HD7279_ShortDelay()<br>in_byte=in_byte<<1<br>if(HD7279_DATA) { in_byte=in_byte|0x01}

HD7279_CLK=0

HD7279_ShortDelay()

}

HD7279_DATA=0

return (in_byte)

}

/*--------------------------------------------

调用方式：unsigned char HD7279_GetKey()函数﹫2001/05/12

函数说明：私有函数，读键盘函数

--------------------------------------------*/

unsigned char HD7279_GetKey()

{

unsigned char key

if(!HD7279_KEY)

{

HD7279_SendByte(HD7279_READ)

key=HD7279_ReceiveByte()

switch( key )

{case RunKey: <br>case StopKey: <br>while(!HD7279_KEY)<br>default: return(0xff)<br>}

}

return(0xff)

}

/*--------------------------------------------

调用方式：main()函数﹫2001/05/12

函数说明：私有函数，例函数

--------------------------------------------*/

main()

{HD7279_SendByte(0xa4)//复位<br>Write7279(0x80,0)//显示‘0’<br>}

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给你个参考吧，T1是显示控制，消隐时间由T1初值决定一般5毫秒左右就可以了。

KEYVAL EQU 30H

DAT EQU 33H

SCANLED EQU 39H

CLK EQU 77H

SEC EQU 78H

SEC1 EQU 79H

SEC2 EQU 7AH

DOT BIT 00H

ORG 0000H

LJMP MAIN

ORG 0003H

LJMP EXTINT0

ORG 000BH

LJMP T0ISR 50ms定时

ORG 001BH

LJMP T1ISR 扫描显示

ORG 0030H

MAIN:

MOV SP,#5FH

MOV TMOD,#11H

MOV TH0,#03CH

MOV TL0,#0B0H

MOV TH1,#0ECH

MOV TL1,#078H

MOV KEYVAL,#0FFH

MOV 33H,#10H

MOV 34H,#10H

MOV 35H,#10H

MOV 36H,#10H

MOV SEC,#0

MOV SEC1,#0

MOV SEC2,#0

MOV CLK,#0

SETB IT0

SETB EX0

CLR TR0

CLR ET0

SETB TR1

SETB ET1

SETB EA

LOOP:

MOV A,KEYVAL

LOOP1:

JNZ LOOP2 启动

SETB TR0

SETB ET0

SJMP LOOP

LOOP2:

DEC A

JNZ LOOP3 暂停

CLR TR0

CLR ET0

SJMP LOOP

LOOP3:

DEC A

JNZ LOOP4 清零

MOV SEC,#0

MOV SEC1,#0

MOV SEC2,#0

LCALL DISCHG

SJMP LOOP

LOOP4:

可以在此扩展想要的功能

SJMP LOOP

------------------

十六进制转换为BCD

HBCD:

MOV B,#10

DIV AB

SWAP A

ORL A,B

RET

--------------------

DELAY:

MOV R3,#50

DELAY1:

MOV R4,#100

DJNZ R4,$

DJNZ R3,DELAY1

DJNZ R2,DELAY

RET

--------------------

EXTINT0:

PUSH ACC

INC KEYVAL

MOV A,KEYVAL

CJNE A,#3,EXT00

EXT00:

JC EXT01

MOV KEYVAL,#0

EXT01:

POP ACC

RETI

--------------------

T0ISR:

PUSH ACC

CLR TR0

MOV TH0,#3CH

MOV TL0,#0B0H

SETB TR0

INC CLK

MOV A,CLK

CJNE A,#2,T0ISRE

MOV CLK,#0

INC SEC1

MOV A,SEC1

CJNE A,#100,T0ISRE

MOV SEC1,#0

INC SEC2

MOV A,SEC2

CJNE A,#100,T0ISRE

MOV SEC,#0

MOV SEC1,#0

MOV SEC2,#0

T0ISRE:

LCALL DISCHG

POP ACC

RETI

--------------------

DISCHG:

MOV A,SEC1

LCALL HBCD

PUSH ACC

ANL A,#0FH

MOV 36H,A

POP ACC

ANL A,#0F0H

SWAP A

MOV 35H,A

MOV A,SEC2

LCALL HBCD

PUSH ACC

ANL A,#0FH

MOV 34H,A

POP ACC

ANL A,#0F0H

SWAP A

MOV 33H,A

RET

--------------------

T1ISR:

PUSH ACC

CLR TR1

MOV TH1,#0ECH

MOV TL1,#78H

SETB TR1

MOV DPTR,#LEDTAB

T100:

MOV R0,#DAT

MOV A,SCANLED

ADD A,R0

MOV R0,A

MOV A,SCANLED

JNZ T101

MOV P2,#01H

CLR DOT

SJMP T1DIS

T101:

DEC A

JNZ T102

MOV P2,#02H

CLR DOT

SJMP T1DIS

T102:

DEC A

JNZ T103

MOV P2,#04H

SETB DOT

SJMP T1DIS

T103:

DEC A

JNZ T1DIS

MOV P2,#08H

CLR DOT

T1DIS:

MOV A,@R0

MOVC A,@A+DPTR

JNB DOT,T1DIS1

ORL A,#01H

T1DIS1:

CPL A

MOV P0,A

INC SCANLED

MOV A,SCANLED

CJNE A,#4,T1END

MOV SCANLED,#0

T1END:

POP ACC

RETI

--------------------

LEDTAB: DB 0FCH "0" 00H

DB 60H "1" 01H

DB 0DAH "2" 02H

DB 0F2H "3" 03H

DB 66H "4" 04H

DB 0B6H "5" 05H

DB 0BEH "6" 06H

DB 0E0H "7" 07H

DB 0FEH "8" 08H

DB 0F6H "9" 09H

DB 0EEH "A" 0AH

DB 3EH "B" 0BH

DB 9CH "C" 0CH

DB 7AH "D" 0DH

DB 9EH "E" 0EH

DB 8EH "F" 0FH

DB 00H " " 10H

--------------------

END

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