From 4816dae943e197e24c422908cdb27220ba4d11b4 Mon Sep 17 00:00:00 2001
From: CrispyPin <crispin@tasa.se>
Date: Thu, 19 Jun 2025 01:15:48 +0200
Subject: [PATCH] align to 1 fps

---
 ch32_decoder/bad_apple.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ch32_decoder/bad_apple.c b/ch32_decoder/bad_apple.c
index ba8d861..1de0a7c 100644
--- a/ch32_decoder/bad_apple.c
+++ b/ch32_decoder/bad_apple.c
@@ -12,6 +12,9 @@
 #define HEIGHT 32
 #define X_OFFSET ((128 - WIDTH) / 2)
 
+#define FPS 1
+#define SYSTICKS_PER_FRAME ((DELAY_US_TIME * 1000000) / FPS)
+
 void decode_next_frame();
 void refresh_screen();
 void clear_screen();
@@ -33,10 +36,12 @@ int main() {
 		ssd1306_cmd(*cmd_list++);
 	clear_screen();
 
+	u32 next_frame = SysTick->CNT;
 	while (1) {
 		decode_next_frame();
+		while (SysTick->CNT < next_frame) {}
+		next_frame += SYSTICKS_PER_FRAME;
 		refresh_screen();
-		Delay_Ms(300);
 		if (reader >= sizeof(video))
 			reader = 0;
 	}