more demo stuff

main.c

@@ -1,7 +1,10 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 #include "pico/stdlib.h"
 #include "hardware/gpio.h"
 #include "pico/binary_info.h"
+#include "hardware/regs/rosc.h"
 
 #include "hardware/spi.h"
 
@@ -65,9 +68,51 @@ static const fb_bitmap_t zir = {
         .data = zir_data
 };
 
+void seed_random_from_rosc()
+{
+    uint32_t random = 0x811c9dc5;
+    uint8_t next_byte = 0;
+    volatile uint32_t *rnd_reg = (uint32_t *)(ROSC_BASE + ROSC_RANDOMBIT_OFFSET);
+
+    for (int i = 0; i < 16; i++) {
+        for (int k = 0; k < 8; k++) {
+            next_byte = (next_byte << 1) | (*rnd_reg & 1);
+        }
+
+        random ^= next_byte;
+        random *= 0x01000193;
+    }
+
+    srand(random);
+}
+
+
+
+void freeline(float x1, float y1, float x2, float y2, fbcolor_t color)
+{
+    float dx = ((float) x2 - (float) x1);
+    float dy = (float) y2 - (float) y1;
+    float dxa = dx > 0 ? dx : -dx;
+    float dya = dy > 0 ? dy : -dy;
+    float maxdist = MAX(dxa, dya);
+    dx /= maxdist;
+    dy /= maxdist;
+
+    fb_px((fbpos_t) roundf(x1), (fbpos_t) roundf(y1), color);
+    //fb_px((fbpos_t) x2, (fbpos_t) y2, color);
+    for (uint d = 0; d <= (uint) maxdist; d++) {
+        x1 += dx;
+        y1 += dy;
+        fb_px((fbpos_t) roundf(x1), (fbpos_t) roundf(y1), color);
+    }
+}
+
+
 int main() {
 	stdio_init_all();
 
+    seed_random_from_rosc();
+
     gpio_init(LED_PIN);
     gpio_set_dir(LED_PIN, GPIO_OUT);
 
@@ -75,27 +120,111 @@ int main() {
 
     fb_clear();
 
-    fb_bitmap(5, 5, &zir);
-    fb_bitmap(20, 5, &zir);
-
-    fb_text(40, 35, "MEOW", FONT_DOUBLE, 1);
-    fb_text(50, 20, "meow", FONT_DOUBLE, 1);
-
-    fb_frame(0, 0, 128, 64, 2, 1);
-
     fb_blit();
 
-	while (1) {
-        oled_invert(true);
+#define NUMBALLS 50
+#define BALLW 2
+    struct ball {
+        float x;
+        float y;
+        float sx;
+        float sy;
+    };
 
-		gpio_put(LED_PIN, 0);
-		sleep_ms(1000);
+    struct ball balls[NUMBALLS];
 
-        oled_invert(false);
+    for (uint i = 0; i < NUMBALLS; i++) {
+        balls[i].x = (float) (random() % FBW);
+        balls[i].y = (float) (random() % FBH);
+        balls[i].sx = ((float) (random() % 100) - 50.0f) / 50.0f;
+        balls[i].sy = ((float) (random() % 100) - 50.0f) / 50.0f;
+    }
 
-		gpio_put(LED_PIN, 1);
+    float fi = 0;
+
+	while (1) {
+        //gpio_put(LED_PIN, 0);
+        //oled_invert(true);
+
+        fi += M_PI / 180.0f;
+
+        for (uint i = 0; i < NUMBALLS; i++) {
+            struct ball *ball = &balls[i];
+            ball->x += ball->sx;
+            ball->y += ball->sy;
+
+            if (ball->sx < 0 && ball->x <= 0) {
+                ball->sx *= -1;
+                ball->x = 0;
+            }
+            if (ball->sx > 0 && ball->x >= FBW - BALLW) {
+                ball->sx *= -1;
+                ball->x = FBW - BALLW;
+            }
+            if (ball->sy < 0 && ball->y <= 0) {
+                ball->sy *= -1;
+                ball->y = 0;
+            }
+            if (ball->sy > 0 && ball->y >= FBH - BALLW) {
+                ball->sy *= -1;
+                ball->y = FBH - BALLW;
+            }
+        }
+
+        // rotating hexagon
+        const float CW = 15;
+        const float AA = M_PI / 3.0f;
+        const float HEXX = 30;
+        const float HEXY = 32;
+
+        float ar[] = {
+                sinf(0 + fi) * CW,
+                cosf(0 + fi) * CW,
+
+                sinf(AA + fi) * CW,
+                cosf(AA + fi) * CW,
+
+                sinf(AA*2 + fi) * CW,
+                cosf(AA*2 + fi) * CW,
+
+                sinf(AA*3 + fi) * CW,
+                cosf(AA*3 + fi) * CW,
+
+                sinf(AA*4 + fi) * CW,
+                cosf(AA*4 + fi) * CW,
+
+                sinf(AA*5 + fi) * CW,
+                cosf(AA*5 + fi) * CW,
+
+                sinf(AA*6 + fi) * CW,
+                cosf(AA*6 + fi) * CW,
+        };
+
+        fb_clear();
+        fb_text(70, 30, "MEOW", FONT_DOUBLE, 1);
+        fb_text(80, 15, "meow", FONT_DOUBLE, 1);
+
+        for (uint i = 3; i <= 13; i += 2) {
+            freeline(HEXX + ar[i-3], HEXY + ar[i-2], HEXX + ar[i-1], HEXY + ar[i], 1);
+            if (i == 3 || i == 7 || i == 11) {
+                fb_text(HEXX + ar[i-3] -5, HEXY + ar[i-2] - 3, "Miau!", FONT_5X7, 1);
+            }
+        }
+
+        for (uint i = 0; i < NUMBALLS; i++) {
+            struct ball *ball = &balls[i];
+            fb_rect((fbpos_t) roundf(ball->x), (fbpos_t) roundf(ball->y), BALLW, BALLW, 1);
+        }
+
+        fb_blit();
+
+        sleep_ms(10);
+
+        //oled_invert(false);
+
+		//gpio_put(LED_PIN, 1);
 
 		//puts("Hello World\n");
-		sleep_ms(1000);
+		//sleep_ms(1000);
 	}
 }

ufb/framebuffer.c

@@ -48,7 +48,7 @@ void fb_invert()
 
 void fb_px(fbpos_t x, fbpos_t y, fbcolor_t color)
 {
-    if (x >= FBW || y >= FBH) { return; }
+    if (x >= FBW || y >= FBH || x < 0 || y < 0) { return; }
     const fbpos_t row = y / 8;
     const fbpos_t rowrem = y % 8;
     const fbsize_t cell = (fbsize_t) x + (fbsize_t) row * FBW;

ufb/framebuffer.h

@@ -16,9 +16,9 @@
 /// Width/height type
 typedef uint16_t fbsize_t;
 /// Position type (X/Y)
-typedef uint8_t  fbpos_t;
+typedef int16_t fbpos_t;
 /// Color type
-typedef uint8_t  fbcolor_t;
+typedef uint8_t fbcolor_t;
 
 /// Bitmap struct
 typedef struct {
@@ -88,12 +88,12 @@ void fb_frame(fbpos_t x, fbpos_t y, fbpos_t w, fbpos_t h, fbpos_t thickness, fbc
 
 /// Draw a bitmap using the bitmap struct
 #if IS_AVR
-    static inline void fb_bitmap_P(fbpos_t x, fbpos_t y, const fb_bitmap_t *bitmap) {
-        fb_bitmap_ex_P(x, y, bitmap->width, bitmap->height, bitmap->data, 1);
+    static inline void fb_bitmap_P(fbpos_t x, fbpos_t y, const fb_bitmap_t *bitmap, fbcolor_t color) {
+        fb_bitmap_ex_P(x, y, bitmap->width, bitmap->height, bitmap->data, color);
     }
 #else
-    static inline void fb_bitmap(fbpos_t x, fbpos_t y, const fb_bitmap_t *bitmap) {
-        fb_bitmap_ex(x, y, bitmap->width, bitmap->height, bitmap->data, 1);
+    static inline void fb_bitmap(fbpos_t x, fbpos_t y, const fb_bitmap_t *bitmap, fbcolor_t color) {
+        fb_bitmap_ex(x, y, bitmap->width, bitmap->height, bitmap->data, color);
     }
 #endif