55 lines
2.3 KiB
C
55 lines
2.3 KiB
C
// test4.c
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// 利用定时器T0定时10秒，并通过数码管显示秒表，到10秒后让led流水灯从左往右移动
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// use timer T0 to count 10 seconds and display the stopwatch on the 7-segment display, and let the led light move from left to right after 10 seconds.
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#include "homework6.h"
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unsigned char digits[2] = {0, 0};
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unsigned char displayPos = 0;
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void test4()
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{
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digits[0] = 1; // set the first digit to 0.
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digits[1] = 0; // set the second digit to 1.
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TMOD = 0x01; // set the timer 0 to mode 1.
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TH0 = 0xFC; // set the timer 0 to 1s.
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TL0 = 0x18; // set the timer 0 to 1s.
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TR0 = 1; // start the timer 0.
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ET0 = 1; // enable the timer 0 interrupt.
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EA = 1; // enable the interrupt.
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while (1) {}
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}
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void Timer0_ISR() interrupt 1
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{
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static unsigned char led = 0xFE; // store the led light.
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static unsigned int counter = 0; // counter to count the number of interrupts.
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TH0 = 0xFC; // reset the timer 0.
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TL0 = 0x18; // reset the timer 0.
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if (digits[0] == 0 && digits[1] == 0) { // if the stopwatch is 00, let the led light move from left to right.
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set38(TO_LED); // set the 38 transistors to the address.
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if (++counter >= 1000) {
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counter = 0; // reset the counter.
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led = (led << 1) | 0x01; // shift the led light to the left.
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if (led == 0xFF) led = 0xFE; // if the led light is 0xFF, reset the led light to 0xFE.
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P2 = led; // set the led light.
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}
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} else {
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set38(displayPos); // set the 38 transistors to the address.
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P2 = LedChar[digits[1 - displayPos]]; // display the digit.
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displayPos++; // switch to the next digit.
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if (displayPos >= 2) displayPos = 0; // if the display position is 2, reset the display position to 0.
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if (++counter >= 1000) { // if the counter is 1000, count 1 second.
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counter = 0; // reset the counter.
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if (digits[1]-- == 0) {
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digits[1] = 9;
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if (digits[0] > 0) {
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digits[0]--;
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}
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}
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}
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}
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}
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void main()
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{
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test4();
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} |