在對(duì)LED燈的應(yīng)用有了一定的了解之后，我開(kāi)始學(xué)習(xí)了一些關(guān)于數(shù)碼管的應(yīng)用。

在我的開(kāi)發(fā)板上，有獨(dú)立共陽(yáng)管和八位共陰管 。數(shù)碼管從高位到低位的段碼依次是h(dp),g,f,e,d,c,b,a共八位。共陰管是“1”表示亮，“0”表示滅，而共陽(yáng)管則是相反的。順便提一句，若是要檢測(cè)數(shù)碼管是否完好，可以用數(shù)碼管“8”來(lái)檢測(cè)。

若是要在數(shù)碼管上顯示0~F，則可以用一套固定的十六進(jìn)制數(shù)表示，可以放在數(shù)組中，為{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}。這一個(gè)數(shù)組是用來(lái)表示共陰管的亮的，而若是共陽(yáng)管的時(shí)候，需要在前面加上“~”。

獨(dú)立共陽(yáng)管顯示0-F

//顯示0-F

#include

unsigned char code LED[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void DelayUs2x(unsigned char t)

{

while(--t);

}

void DelayMs(unsigned char t)

{

while(t--)

{

DelayUs2x(245);

DelayUs2x(245);

}

}

void main(void)

{

unsigned char i;

while(1)

{

for(i=0; i<16; i++)

{

P1=~LED[i]; //取反

DelayMs(200); //大約延遲200ms

}

}

}

8位共陰管顯示有靜態(tài)掃描和動(dòng)態(tài)掃描兩種方式。

1、8個(gè)同時(shí)顯示0-F 靜態(tài)掃描

#include

#define DataPort P0 //數(shù)據(jù)端口

sbit Seg_latch=P2^2; //段鎖存

sbit Bit_latch=P2^3; //位鎖存 兩者必須是取反，只能有一個(gè)成立

unsigned char code Seg_code[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void DelayUs2x(unsigned char t)

{

while(--t);

}

void DelayMs(unsigned char t)

{

while(t--)

{

DelayUs2x(245);

DelayUs2x(245);

}

}

void main(void)

{

unsigned char i;

while(1)

{

for(i=0; i<16; i++)

{

DataPort=Seg_code[i]; //控制段鎖存，顯示0-F

Seg_latch=1; //開(kāi)段鎖存

Seg_latch=0; //關(guān)段鎖存 值進(jìn)來(lái)了

DataPort=0x00; //控制位鎖存（低電平有效），8個(gè)管同時(shí)亮

Bit_latch=1; //開(kāi)位鎖存

Bit_latch=0; //關(guān)位鎖存

DelayMs(200);

}

}

}

2、顯示0-F：先是顯示0-7，然后顯示8-F 位：第1-8位，第1-8位 動(dòng)態(tài)掃描

#include

#define DataPort P0

sbit Seg_latch=P2^2;

sbit Bit_latch=P2^3;

unsigned char code Seg_code[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

unsigned char code Bit_code[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};

void delay(unsigned char i)

{

while(i--)

;

}

void main(void)

{

unsigned char i;

while(1)

{

for(i=0; i<16; i++)

{

DataPort=0x00; //消除重影

Seg_latch=1;

Seg_latch=0;

DataPort=Bit_code[i]; //位碼

Bit_latch=1;

Bit_latch=0;

DataPort=Seg_code[i]; //段碼

Seg_latch=1;

Seg_latch=0;

delay(100000);

}

}

}