前不久用c語(yǔ)言寫(xiě)了一個(gè)數(shù)碼管動(dòng)態(tài)顯示倒計(jì)時(shí)程序,。倒計(jì)時(shí)倒是沒(méi)問(wèn)題,,可無(wú)論我怎么調(diào)延時(shí)時(shí)間,,他都閃爍的厲害,,請(qǐng)問(wèn)高手怎么處理,。是掃描頻率太低,,還是點(diǎn)亮后延時(shí)不夠。如果是以上的原因,,那么掃描頻率和動(dòng)態(tài)延時(shí)各要多少才能看起來(lái)不閃,。: R4 |" ?! d* b8 b( c+ f7 i0 D
程序如下:' w* u- Y0 Z# X& {4 `, g b; p
#include <AT89X51.H>
( R4 Z# L* a0 ?3 W. Runsigned char code led[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};4 k5 ?3 [ s0 |: I
int i=0,j=0,k=1,a=0;# G, Y" a" `9 H& M- V
sbit beep=P2^1;
9 `; y: Q7 y" qsbit P35=P3^5;
/ f. O7 W& e/ b& F1 qsbit P36=P3^6;+ P0 x$ w4 B/ T- L4 {
sbit P37=P3^7;
! `( @7 \/ W m" a7 L2 j8 c! rvoid delay(unsigned int aa)
$ `$ u" a& H; t$ w0 @{unsigned int jj;! s$ F4 l! v7 ]0 x# o
for(;aa>0;aa--)+ ?2 ]6 F% a w" e6 @
for(jj=0;jj<60;jj++); Q! s" `4 u6 z6 I. y
{;}}3 m! s% ]$ |/ B
void main(void)
& }' Q$ k; L# N/ ^{
$ x" V3 t0 U j8 \) ?EA=1;
: V) m2 m- j E5 a6 \3 A7 {ET0=1;
6 e9 K9 J& [$ E; y& o3 b/ T4 KTMOD=0x01;2 B9 A( P1 X6 n
TH0=0xff;
# ?" Q' h! H: w' Y6 OTL0=0xff;
" y, ?3 C. n* @( z$ J+ @) BTR0=1;
. {7 j8 g' }2 ~ K. e5 qwhile(1)
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} }
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. Z! Z3 i) A: C A$ c, i; pvoid timer0() interrupt 1% J5 m, x9 d! Z; x, z3 O0 O6 m) K7 I2 @
{if(i<1&&j<1&&k<1)( N7 }. O v* x0 W. h2 o
{P37=0;
4 k8 ]7 d5 E+ E$ zP0=led[0];; O: r% ^5 u8 \4 h# f7 z! d
beep=0;
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$ z2 P8 w1 w/ T+ P, d6 t( z" z# Delse 0 F9 E9 d& z- ?5 X/ F
{
4 ^3 o$ ]6 R3 Q' w7 u! qP37=0;& D/ U- u' k& R/ d
P0=led;
7 l' w4 T8 `; cdelay(5); ( R6 @: h6 q1 D2 A* P
P37=1;6 l8 p* {6 c- w
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if(j<1&&k<1)
5 o7 Z) M) b4 Z2 u( pP36=1;& Z1 q! B# U5 j8 y
else) \3 s0 i7 W, F8 I. b
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P36=0;) }( C- V) [5 @" Z
P0=led[j];# a* b, R. K( ~7 Y% n
delay(5); 6 P! }6 c5 O5 X2 E# ~
P36=1; 0 a' U% \$ F. O9 U# l, l
}* |% ~( `1 |) j3 e5 \# g( E5 i
if(k<1)4 r# Y" p, l& ~7 o
P35=1;
! R: w! r% g$ T; ^: B/ k/ Qelse
, u' N7 ~1 p0 t$ y$ |$ n m{P35=0;4 ~: _, ?3 D2 P" c: M! S. g
P0=led[k];
. p: Y6 \, s: U! n. odelay(5);
D: r: L4 {0 _* [% W- j qP35=1;$ M8 Z& T5 _: e$ A8 p) P
}a++;
, Y D/ q5 Y& z0 Q8 P* Dif(a%20==0)7 a, C+ F6 L; w" e" O
{
* J# W+ s9 m( Ki--;
4 W% ?# n; y0 ?/ Kif(i<0)
9 ]' C( q7 D% g: M2 g: c5 M{i=9;7 ~8 i) {. Q, l
j--;}$ A; p& w! G# b8 s; M, X/ k; x
if(j<0)
' l* X9 y1 H5 q- I8 N{j=9;
5 c* i' j _4 T) L" yk--;}
; [. m/ x; J' y/ b6 c! J$ K0 u4 NTH0=0xB1;
0 t3 v A/ w: W: o2 n. s2 ATL0=0xE0;8 I( \5 M6 j( n2 F x
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