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单片机定时器T0被四次调用,控制led灯9 ?1 Z d" f5 s5 Y& b6 t" h2 z
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8 ?: W0 o3 f; ^6 j% E9 ?1 R定时器T0被四次调用,控制led灯
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- ]7 T' ^: o. M" I* v8 Z#include<reg52.h> //头文件. W% I* ^6 r( r& g
#define MY_TIMER_MAX (4) //最多四个定时器
/ H: R3 U* `% I. B#define NULL (0)
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; a( ~, R B. X6 |' Z: G0 wtypedef void (*pFun)(void); //callback 函数指针类型
. D& U. B' F8 qtypedef struct myTimer
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char on; //开关( |( Q; z6 c0 r# N/ @( Y/ F# @
char is_period; //是否周期循环- \0 _( d$ w8 g; f5 V: k
unsigned short int time_out; //定时时间,单位ms
. n5 `/ T+ Q" Y, U1 g2 g unsigned short int count; //定时计数用2 n+ X7 A6 Y, L) e6 ~! o
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MY_TIMER;4 r" i$ @% q! c7 W" o; Q
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pFun callback[MY_TIMER_MAX] = {NULL}; //定时器回调函数数组0 `6 | V2 M( Q7 V' y7 D
MY_TIMER myTimerList[MY_TIMER_MAX] = {0}; //定时器结构数组
. P7 g2 @8 W, n; M0 M) Gint gMyTimerMessage[MY_TIMER_MAX] = {0}; //定时器消息数组3 r! U* E1 n+ ^
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sbit LED1=P1^0;3 ~% K* \; e Q
sbit LED2=P1^1;
7 W# H D9 K, n: f D/ N8 f- nsbit LED3=P1^2;$ s: }- w- P3 z# i% K
sbit LED4=P1^3;
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) V; R# A( K ^#define ALL_ON {LED1=0;LED2=0;LED3=0;LED4=0;} //灯全开$ g/ }* s9 b7 O8 ?
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//创建定时器,简化版本。7 a w. d9 k, k# X+ Z2 t1 R
int CreatTimer(int index,unsigned short int time_out,char is_period,pFun callbackFun)1 f0 ^$ D; O' @) S& Q4 K0 M
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if(index >= MY_TIMER_MAX) return -1;
8 W; t, v% T6 |$ h0 T! c, Y myTimerList[index].on = 1;7 q' b0 r+ J& r; L7 q* v
myTimerList[index].is_period = is_period;3 x2 S7 ^0 a1 P. N
myTimerList[index].time_out = time_out;
8 |9 L6 K3 w# _1 S7 |. {4 d myTimerList[index].count = 0;5 A* B1 v& b% Y. Z2 s6 I5 X
callback[index] = callbackFun;
; l, a w" C: J$ o' C5 C! v return index;; V% ^7 h2 S" a' z& Z/ @
}
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9 g8 L* _, I! [& d/ \* m7 v7 L//四个LED控制函数,on初始是0,第一次调用on变为1,是关灯。
- d2 r; w' L) B! w y( bvoid led_1_ctrl(void)
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static char on = 0;
6 A% [# L+ }8 G3 @ I" B7 H' a2 q on = !on;
( y( o- k$ N j5 `" B LED1 = on;! W& e3 c2 G: y* I. O5 V* C4 D
}
) W3 B; Y* P% q! Y" Ovoid led_2_ctrl(void): c* F, U2 `! \" O
{
" ]2 j: |8 p1 j5 y2 J static char on = 0;# X$ v% Y$ Z4 U# Z+ p
on = !on;2 n( p) E2 s2 x, d: P" T
LED2 = on;
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void led_3_ctrl(void) H! S% U0 b/ u1 `1 Z
{
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on = !on;
$ s6 U; g* m* {! c: P LED3 = on;
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void led_4_ctrl(void): S4 x- M) X- L8 m7 z8 ]
{
% h3 r) ?+ h) [6 X: Z9 ? static char on = 0;( c8 T' V+ o7 C9 x o' V, C
on = !on;
8 J) h8 C% E% k( Y- a; _' B3 h6 b LED4 = on;& i8 Q! X5 [) j& |0 e
}
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9 b, _# W h a9 q% r: [! {% y3 kvoid Init_Timer0(void) //初始化定时器0
f2 H, s! e5 L3 d{
" f+ e; D! K/ z! B9 \ TMOD=0x01; //定时器0,使用模式1,16位定时器
# K+ W0 a# V* ^; \! _ TH0=(65536-1000)/256; //给定初值* |3 M( c/ R2 f
TL0=(65536-1000)%256;
8 u; H, f9 }% f% {) g; h' R8 B7 Y EA=1; //打开总中断
' x3 B9 B9 z" F$ t ET0=1; //打开定时器中断1 k$ I; b- C3 Y" [; K. ?* p
TR0=1; //开定时器' F/ i. E- [' v! J: V- X
}
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void main() //主函数
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unsigned int i;2 ]; ?5 y: L0 X. o# N, F; s
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ALL_ON;
: S, `1 ? U$ R CreatTimer(0,250,1,led_1_ctrl);
5 M! x7 w+ ~5 G- k+ v) J C CreatTimer(1,500,1,led_2_ctrl);
1 P8 `4 _+ G2 B7 J/ A( c CreatTimer(2,1000,1,led_3_ctrl);0 I7 E, P9 |' h$ g- {4 o
CreatTimer(3,2000,1,led_4_ctrl);
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; v8 K8 V. E$ H0 V- a9 i. d Init_Timer0();//初始化定时器0' b& s; u9 q" ]+ y6 u, n$ H
while(1)+ O: }4 r* T+ S
{
" j3 H- P! F+ U for(i = 0; i<MY_TIMER_MAX; ++i)
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if(gMyTimerMessage) //定时器消息来到,启动。. _0 l9 H% X$ j) ?( y
{
8 t5 @- J7 q$ Z# e gMyTimerMessage = 0; //消息清除$ I: U" y2 V a; T' _" w6 J
if(callback != NULL)
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/ w8 K2 B- J S: v5 ^( m8 w- e (*callback)(); //调用回调函数# Y# K) N& k2 X
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}
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//定时器中断函数,1ms 定时。
# }' Q, O, g S7 i' r+ T0 ~' j7 i! ivoid Timer0_isr(void) interrupt 13 w+ \- Q) C7 d
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unsigned int i = 0;
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- v+ j6 s7 n: M6 W% \4 I TH0=(65536-1000)/256;//重新赋值 1ms5 ^# Q s; W# G- U- o. a
TL0=(65536-1000)%256;
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EA = 0;4 A# z7 j1 M+ Z
for(i = 0; i<MY_TIMER_MAX; ++i)
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5 P# u) T ?. u: [2 q if(myTimerList.on)2 ^, C' M" _3 i
{
( B/ k( X T1 m2 F: r ++(myTimerList.count); //计数
8 n3 Q6 N1 Y5 S7 G if(myTimerList.count >= myTimerList.time_out) //定时到5 Z2 w: z* G! w. z8 i8 W$ d
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gMyTimerMessage = 1; //发消息7 `0 W& h/ G3 i* z# c6 m1 r
if(myTimerList.is_period) //是否周期循环
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myTimerList.count = 0; //计数重置
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