Added basic speed limiter

src/main.cpp

@@ -5,6 +5,9 @@
 // For reading FIFO
 #include <fcntl.h>
 #include <unistd.h>
+// For sleep
+#include <chrono>
+#include <thread>
 
 // Local files
 #include "utility/bitmap.hpp"
@@ -78,9 +81,19 @@ int main(int argc, char *argv[]) {
 	Dox.connect_loop();
 
 
+	// Frame rate limiter
+	std::chrono::time_point<
+		std::chrono::steady_clock,
+		std::chrono::nanoseconds
+	> t = std::chrono::steady_clock::now();
+	//t += std::chrono::milliseconds(30);
+	//this_thread::sleep_until(t);
+
+
 	while (1) {
 
 		if (Dox.is_connected()) {
+			if (std::chrono::steady_clock::now() > t + std::chrono::milliseconds(30)) {
 				if (Dox.get_animation_mode() == 0x02) {
 					buf.update();
 					fft.update(buf);
@@ -101,6 +114,9 @@ int main(int argc, char *argv[]) {
 
 				Dox.write(CMD_ANIM_DATA, hid_buf, Dox.packet_size);
 
+				t = std::chrono::steady_clock::now();
+			}
+
 			// Dox.write might detect that we've been disconnected,
 			// and Dox.read will fail if we are.
 			// This check prevents it from doing that, and instead jumps to reconnect.