定時器延時

 1 #include <iocc2540.h>
 2 
 3 typedef unsigned char uchar;
 4 typedef unsigned int uint;
 5 
 6 uint flag = 0;          //用於定時器計數
 7 
 8 #define LED1 P1_0
 9 #define LED2 P1_1
10 #define LED3 P1_2
11 #define LED4 P1_3
12 
13 void led_init(void)
14 {
15   P1DIR |= 0X0F;                //I/O方向設置，P1.0定義爲輸出
16   P1SEL &= ~0X0F;               //做爲普通的io口
17   LED1 = 0;
18   LED2 = 0;
19   LED3 = 0;
20   LED4 = 0;
21 }
22 
23 
24 /******************************
25 *name: T3_Init
26 *function: 定時器初始化，系統不配置工做時鐘默認是2分頻，即16MHZ
27 *******************************/
28 void T3_Init(void)
29 {
30   T3IE = 1;             //T3中斷使能
31   T3CCTL0 = 0XCA;       //捕捉上邊緣
32   T3CTL |= 0xF8;         //128分頻
33   //T1STAT = 0x21;        //選擇0通道
34   EA = 1;
35 }
36 
37 //定時器T3中斷處理函數
38 #pragma vector = T3_VECTOR
39 __interrupt void T3_ISR(void)
40 {
41   IRCON = 0X00;         //清中斷標誌
42   flag++;
43   if(flag>230)          //計數值爲245，230次中斷後LED燈取反，閃爍一輪爲1秒延時
44   {
45     flag = 0;           //clr count
46     LED2 = ~LED2;       //中斷執行的任務
47     
48   }
49 }
50 
51 void main(void)
52 {
53   //initialize hardware
54   led_init();
55   T3_Init();
56   
57   //uchar count = 0;
58   while(1)
59   {
60     /*if(IRCON>0)
61     {
62       //進入中斷
63       IRCON = 0;        //進入中斷，首先關閉中斷
64       if (count++ >=2)
65       {
66         count = 0;              //count清除
67         LED1 = ~LED1;
68       }
69     }*/
70   }
71   
72 }