Single-Chip Microcomputer: the stopwatch count is implemented in C Language (Keys start, end, reset)

Single-Chip Microcomputer: the stopwatch count is implemented in C Language (Keys start, end, reset)

Implement the stopwatch counting function, using the timer and external interrupt. The 8 button indicates the start/end of the timer, and the C button indicates that the value is reset to 0. For convenience of demonstration, the upper limit is set to 15 seconds.

The Code contains detailed notes:

 

# Include
 
  
Sbit WEI = P2 ^ 7; sbit DUAN = P2 ^ 6; sbit L1 = P3 ^ 4; unsigned char code dofly_DuanMa [11] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x40}; // The field code value is 0 ~ 9 unsigned char code dofly_WeiMa [] = {0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f}; // the corresponding Digital tubes are lit, that is, the location code void delay (int t) {while (t --);} // The first parameter I represents the number of digital tubes to be controlled, and n represents the number to be displayed void Screen (int I, int n) {P0 = 0; DUAN = 1; DUAN = 0; P0 = dofly_WeiMa [I]; WEI = 1; WEI = 0; P0 = dofly_DuanMa [n]; DUAN = 1; DUAN = 0;} int sec; int num; int I; int flag; int main () {flag = 1; I = 0; num = 0; sec = 0; WEI = 0; DUAN = 0; // open interrupt EX0 = 1; IT0 = 1; EX1 = 1; IT1 = 1; // The timer initializes TMO D | = 0x01; EA = 1; ET0 = 1; TR0 = 1; L1 = 0; while (1) {if (num> = 10) Screen (3, num/10); Screen (4, num % 10); delay (10); Screen (5, 10); Screen (6, sec/10); Screen (7, sec % 10);} return 0;} void Timer_0 () interrupt 1 using 1 {TH0 = (65536-10000)/256; TL0 = (65535-10000) % 256; if (flag = 1) {I ++; sec ++; if (sec = 100) // 0.1 mssec = 0; if (I = 101) // 1 s {I = 0; num ++; if (num = 15) num = 0 ;}} void ACTION1 () interrupt 0 {flag =! Flag;} void ACTION2 () interrupt 2 {if (flag = 0) {Screen (7,0); num = 0; sec = 0 ;}}