【Tiny ML微型机器学习开发板】流星显示背景效果

liliny

通过开发板所带的例程，我们能够测试LCD的显示效果
程序代码：

1. // Animates white pixels to simulate flying through a star field
   
2. 
   
3. #include <SPI.h>
   
4. #include <TFT_eSPI.h>
   
5. 
   
6. // Use hardware SPI
   
7. TFT_eSPI tft = TFT_eSPI();
   
8. 
   
9. // With 1024 stars the update rate is ~65 frames per second
   
10. #define NSTARS 1024
    
11. uint8_t sx[NSTARS] = {};
    
12. uint8_t sy[NSTARS] = {};
    
13. uint8_t sz[NSTARS] = {};
    
14. 
    
15. uint8_t za, zb, zc, zx;
    
16. 
    
17. // Fast 0-255 random number generator from http://eternityforest.com/Projects/rng.php:
    
18. uint8_t __attribute__((always_inline)) rng() {
    
19.     zx++;
    
20.     za = (za ^ zc ^ zx);
    
21.     zb = (zb + za);
    
22.     zc = (zc + (zb >> 1)^za);
    
23.     return zc;
    
24. }
    
25. 
    
26. void setup() {
    
27.     za = random(256);
    
28.     zb = random(256);
    
29.     zc = random(256);
    
30.     zx = random(256);
    
31. 
    
32.     Serial.begin(115200);
    
33.     tft.init();
    
34.     tft.setRotation(1);
    
35.     tft.fillScreen(TFT_BLACK);
    
36. 
    
37.     // fastSetup() must be used immediately before fastPixel() to prepare screen
    
38.     // It must be called after any other graphics drawing function call if fastPixel()
    
39.     // is to be called again
    
40.     //tft.fastSetup(); // Prepare plot window range for fast pixel plotting
    
41. }
    
42. 
    
43. void loop() {
    
44.     unsigned long t0 = micros();
    
45.     uint8_t spawnDepthVariation = 255;
    
46. 
    
47.     for (int i = 0; i < NSTARS; ++i) {
    
48.         if (sz[i] <= 1) {
    
49.             sx[i] = 160 - 120 + rng();
    
50.             sy[i] = rng();
    
51.             sz[i] = spawnDepthVariation--;
    
52.         } else {
    
53.             int old_screen_x = ((int)sx[i] - 160) * 256 / sz[i] + 160;
    
54.             int old_screen_y = ((int)sy[i] - 120) * 256 / sz[i] + 120;
    
55. 
    
56.             // This is a faster pixel drawing function for occassions where many single pixels must be drawn
    
57.             tft.drawPixel(old_screen_x, old_screen_y, TFT_BLACK);
    
58. 
    
59.             sz[i] -= 2;
    
60.             if (sz[i] > 1) {
    
61.                 int screen_x = ((int)sx[i] - 160) * 256 / sz[i] + 160;
    
62.                 int screen_y = ((int)sy[i] - 120) * 256 / sz[i] + 120;
    
63. 
    
64.                 if (screen_x >= 0 && screen_y >= 0 && screen_x < 320 && screen_y < 240) {
    
65.                     uint8_t r, g, b;
    
66.                     r = g = b = 255 - sz[i];
    
67.                     tft.drawPixel(screen_x, screen_y, tft.color565(r, g, b));
    
68.                 } else {
    
69.                     sz[i] = 0;    // Out of screen, die.
    
70.                 }
    
71.             }
    
72.         }
    
73.     }
    
74.     unsigned long t1 = micros();
    
75.     //static char timeMicros[8] = {};
    
76. 
    
77.     // Calcualte frames per second
    
78.     Serial.println(1.0 / ((t1 - t0) / 1000000.0));
    
79. }
    
80. 
    

复制代码

LCD显示效果：
流星效果动态显示