archieve: homework5 test1

homework5/src/homework5.h

@@ -1,10 +1,15 @@
 // homework5.h
 /*
  * this header defines:
+ * variables:
  * 1. pin numbers to control the LED and the Seg.
- * 2. the function to control the LED and the Seg.
- * 3. the function to display the number on the Seg.
- * 4. the function to set the 38 transistors.
+ * 2. sdf for timer
+ * functions:
+ * 1. control the LED and the Seg.
+ * 2. to display the number on the Seg.
+ * 3. to set the 38 transistors.
+ * 4. to display the number on the Seg.
+ * 5. timer.
  */
 
 #include <REG52.H>
@@ -37,4 +42,26 @@ void set38Transistors(unsigned char number) // set the 38 transistors.
     ADDR2 = (number & 0x04) >> 2;
     ADDR1 = (number & 0x02) >> 1;
     ADDR0 = (number & 0x01);
+}
+// timer
+int timer(unsigned int ms)
+{
+    TMOD &= 0xF0; // set the timer mode to 16-bit timer mode.
+    TMOD |= 0x01; // set the timer mode to 16-bit timer mode.
+
+    // 1ms timer definition:
+    TH0 = 0XFC;
+    TL0 = 0X18;
+
+    // start the timer:
+    TR0 = 1;
+
+    while (ms--) {
+        while (!TF0) {} // wait for the timer to overflow.
+        TF0 = 0;        // clear the timer flag.
+        TH0 = 0XFC;     // reload the timer value.
+        TL0 = 0X18;     // reload the timer value.
+    }
+    TR0 = 0; // stop the timer.
+    return 0;
 }

homework5/src/test1.c

@@ -0,0 +1,63 @@
+// test1.c
+// 数码管动态显示自己学号后6位
+// display the last 6 digits of your student ID on the Seg.
+
+#include "homework5.h"
+
+unsigned char code LedChar[] = {
+    0xC0,
+    0xF9,
+    0XA4,
+    0XB0,
+    0X99,
+    0X92,
+    0X82,
+    0XF8,
+    0X80,
+    0X90,
+    0X88,
+    0X83,
+    0XC6,
+    0XA1,
+    0X86,
+    0X8E,
+};
+unsigned char LedBuff[6] = {
+    0xFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF};
+unsigned char i = 0;
+
+void test1()
+{
+    // display the number on the Seg.
+    LedBuff[5] = LedChar[1];
+    LedBuff[4] = LedChar[3];
+    LedBuff[3] = LedChar[0];
+    LedBuff[2] = LedChar[0];
+    LedBuff[1] = LedChar[7];
+    LedBuff[0] = LedChar[1];
+    while (1) {
+        /*
+         * seg id on 38 transistors:
+         * Y0: LEDS0 the latest digit.
+         * Y1: LEDS1 the second digit.
+         * Y2: LEDS2 the third digit.
+         * Y3: LEDS3 the forth digit.
+         * Y4: LEDS4 the fifth digit.
+         * Y5: LEDS5 the highest digit.
+         * Y6: 2LED to the LED lights.
+         */
+        set38Transistors(i);
+        P2 = LedBuff[i];
+        i++;
+        timer(1);
+        // reset the i to 0 when it reaches 6.
+        if (i >= 6) {
+            i = 0;
+        }
+    }
+}
+
+void main()
+{
+    test1();
+}