fix: homework7 test3 animation bugs

homework7/src/test3.c

@@ -1,50 +1,61 @@
 /*
  * @name: test1.c
  * @author: msksbr
- * @date: 2025-05-24
+ * @date: 2025-05-25
  * @description: a test for homework7's homework tests
- * @version: 1.0
+ * @version: 1.0f: fix animation bugs
  * homework zh_CN: 点阵显示一个 I ❤ U 的向下移动动画
  * homework EN: display a animation of I ❤ U moving down on the led matrix
  */
 
 #include "homework7.h"
 
-unsigned char code char_i[] = {
-    0x00, 0x3C, 0x18, 0x18,
-    0x18, 0x18, 0x18, 0x3C};
-unsigned char code char_heart[] = {
-    0x00, 0x66, 0xFF, 0xFF,
-    0xFF, 0x7E, 0x3C, 0x18};
-unsigned char code char_u[] = {
-    0x00, 0x66, 0x66, 0x66,
-    0x66, 0x66, 0x7E, 0x3C};
+unsigned char code display[] = {
+    // it is fucking reverse
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // space
+    0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x7E, 0x3C, // U
+    0x00, 0x66, 0xFF, 0xFF, 0xFF, 0x7E, 0x3C, 0x18, // ❤
+    0x00, 0x3C, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, // I
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // space
+};
 
 void test3()
 {
-    unsigned char i;        // @var i: a counter for the loop
-    unsigned char char_pos; // @var char_pos: the position of the character to be displayed on the led matrix
-    while (1) {
-        for (char_pos = 0; char_pos < 3; char_pos++) { // @loop: switch the char
-            for (i = 8; i > 0; i--) {                  // @loop: display shape on the led matrix
-                switch_138(i);                         // switch the 74HC138's address to i
-                switch (char_pos) {                    // switch the char to be displayed on the led matrix
-                    case 0:
-                        P2 = ~char_i[i]; // display the char_i on the led matrix
-                        break;
-                    case 1:
-                        P2 = ~char_heart[i]; // display the char_heart on the led matrix
-                        break;
-                    case 2:
-                        P2 = ~char_u[i]; // display the char_u on the led matrix
-                        break;
+    EA   = 1;
+    TMOD = 0x01;
+    TH0  = 0xFC;
+    TL0  = 0x67;
+    ET0  = 1;
+    TR0  = 1;
+    while (1);
 }
-                delay_ms(1); // delay 1ms
-                P2 = 0xFF;   // turn off the led matrix
+
+void timer0ISF() interrupt 1
+{
+    static unsigned char i     = 0;
+    static unsigned char tmr   = 0;
+    static unsigned char index = 32;
+
+    TH0 = 0xFC;
+    TL0 = 0x67;
+
+    P2 = 0xFF;
+
+    switch_138(i);
+    i++;
+    P2 = ~display[index + i];
+    if (i >= 8) {
+        i = 0;
     }
-            i = 8; // @subsection reset i to 8
+
+    tmr++;
+    if (tmr >= 250) {
+        tmr = 0;
+        if (index == 0) {
+            index = 32;
+        } else {
+            index--;
         }
-        char_pos = 0; // @subsection reset char_pos to 0
     }
 }