74hc595驅(qū)動串行l(wèi)ed顯示

串行驅(qū)動LED顯示

//一個74hc595位移寄存器驅(qū)動三極管驅(qū)動led位 ，

//兩個74hc595驅(qū)動led段，方式位5位x8段x2=10個數(shù)碼管

//5分頻，每次掃描時間位1.25ms

//定義特殊符號

#define nul 0xf

#define qc 0xc

#define qb 0xb

#define q_ 0xa

#define q__ 0xd

#define q___ 0xe

#define qp 0x10

#define qe 0x11

#define qj 0x12

#define qn 0x13

#define qf 0x14

#define qa 0x15

#define qr 0x16

#define qd 0x17

#define qu 0x18

#define ql 0x19

#define qh 0x1a

#define qwen 0x1b

#define qt 0x1c

#define qla 0x1d

#define qlb 0x1e

#define qlc 0x1f

#define qld 0x20

#define qle 0x21

#define qlf 0x22

#define qlg 0x23

#define qldp 0x24

//顯示段信息，不同led排列組合的段信息只需更改8個數(shù)值即可。

//因此，該定義具有通用性。

// 顯示

// -d 20

// |c 40 |e 10

// - g 80

// |b 2 |f 4

// _a1 .dp 8

#define pa 1

#define pb 2

#define pc 0x40

#define pd 0x20

#define pe 0x10

#define pf 4

#define pg 0x80

#define PDP 8

//--------------

#define l0 PDP+pg

#define l1 255-pf-pe

#define l2 PDP+pc+pf

#define l3 pdp+pc+pb

#define l4 pdp+pa+pb+pd

#define l5 pdp+pb+pe

#define l6 pdp+pe

#define l7 pdp+pc+pg+pb+pa

#define l8 pdp

#define l9 pdp+pb

#define la pdp+pa

#define lb pdp+pd+pe

#define lc pdp+pg+pe+pf

#define ld pdp+pc+pd

#define le pdp+pe+pf

#define lf pdp+pe+pf+pa

#define l_ 255-pg

#define lnul 255

#define ll pdp+pg+pd+pf+pe

#define lp pdp+pa+pf

#define lt pdp+pd+pe+pf

#define lr pdp+pe+pf+pg+pa

#define ln pdp+pg+pa

#define lh pdp+pd+pe+pa

#define ly pdp+pb+pd

#define lu pdp+pg+pd

#define l__ pdp+pg+pb+pc+pe+pf

#define l___ l__-pg

#define l_1 255-pa

#define l_2 255-pa-pg

#define lj 255-(pe+pf+pa)

#define lwen 255-(pd+pe+pg+pb)

#define lall 0

#define lla 255-pa

#define llb 255-pb

#define llc 255-pc

#define lld 255-pd

#define lle 255-pe

#define llf 255-pf

#define llg 255-pg

#define lldp 255-pdp

//串行送出的位信息，目前是10位led顯示。

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

//串行送出的短信息。

unsigned char code un_disp[]={l0,l1,l2,l3,l4,l5,l6,l7,l8,l9,l_,lb,lc,l__,l___,lnul,lp,le,lj,ln,lf,la,lr,ld,lu,

ll,lh,lwen,lt,lla,llb,llc,lld,lle,llf,llg,lldp, lnul };

sbit d_clk=P0^0; //移位時鐘

sbit d_dat=P0^1; //移位數(shù)據(jù)

sbit d_st=P0^2; //移位鎖定

unsigned char dig; //位掃描計(jì)數(shù)器

unsigned char d[10]; //顯示緩沖

//送出8位串行數(shù)據(jù)

void out_disp(unsigned char dd) {

unsigned char i;

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

if (dd&1) d_dat=1; else d_dat=0;

d_clk=0;

dd>>=1;

d_clk=1;

}

}

//控制小數(shù)點(diǎn)和閃爍，顯示數(shù)據(jù)|0x040表示有小數(shù)點(diǎn);顯示數(shù)據(jù)|0x80表示閃爍。

void out_displ(unsigned char dd) {

if (dd>=0x80) {

if (s001>flash_time) {out_disp(0xff);return;}

}

dd&=0x7f;

if (dd>=0x40) {

dd=un_disp[dd&0x3f]^pdp;

} else dd=un_disp[dd];

out_disp(dd);

}

unsigned int s001; //閃爍時間參考

void int_t0(void) interrupt 1 {

unsigned char dd;

TL0=TL0+30;TH0=0xfb; //800

time++;

if ((++s001)>=800) s001=0;

// 顯示

if ((++dig)>4) dig=0;

d_st=0;

dd=d[dig+5];

out_displ(dd);

dd=d[dig];

out_displ(dd);

out_disp(un_dig[dig]);

d_st=1;

}

void main(void) {

unsigned char i;

TMOD=0x1;

TR0=ET0=1;

EA=1;

for (i=0;i<10;i++) d[i]=i; //display test

while (1) {}

}