Minor cleanup

src/config.h

@@ -1,5 +1,26 @@
 #pragma once
 
+// USB device params
+#define HID_VENDOR_ID 0x3297
+#define HID_PRODUCT_ID 0x4976
+#define HID_USAGE 0x61
+#define HID_USAGE_PAGE 0xFF60
+
 // USB packet size, in bytes.
 // Usually 32, but depends on keyboard.
 #define RAW_EPSIZE 32
+
+// How many milliseconds to wait between reconnect attempts
+#define RECONNECT_SLEEP_MS 500
+
+// How many keys in a column * resolution per key.
+// this MUST fit inside a uint8_t (i.e, <= 255).
+#define KB_RESOLUTION (5 * 50)
+
+// How many resolution steps to skip at the top and bottom.
+#define BOTTOM_SKIP 25
+#define TOP_SKIP 50
+
+// Spectrum visualizer range
+#define MIN_HZ 100
+#define MAX_HZ 5000

src/ergodox.cpp

@@ -220,3 +220,12 @@ bool Ergodox::read() {
 void Ergodox::test_connection() {
 	write(CMD_RUTHERE, NULL, 0);
 }
+
+// Block until a connection is established.
+void Ergodox::connect_loop() {
+	wprintf(L"Trying to connect...\n");
+	while (!connected) {
+		try_connect();
+		std::this_thread::sleep_for(std::chrono::milliseconds(RECONNECT_SLEEP_MS));
+	}
+}

src/ergodox.hpp

@@ -3,8 +3,11 @@
 #include <stdexcept>
 #include <cstdint>
 #include <wchar.h>
-#include "hidapi.h"
+// For sleep
+#include <chrono>
+#include <thread>
 
+#include "hidapi.h"
 #include "config.h"
 #include "commands.h"
 
@@ -35,6 +38,7 @@ class Ergodox {
 		bool try_connect();
 		void disconnect();
 		void test_connection();
+		void connect_loop();
 
 		bool read();
 		bool write(uint8_t cmd, const uint8_t* data, uint8_t data_len);

src/main.cpp

@@ -5,9 +5,6 @@
 // For reading FIFO
 #include <fcntl.h>
 #include <unistd.h>
-// For sleep
-#include <chrono>
-#include <thread>
 
 // Local files
 #include "utility/bitmap.hpp"
@@ -15,31 +12,36 @@
 #include "signal_processing/fft.hpp"
 #include "ergodox.hpp"
 #include "commands.h"
+#include "config.h"
 
 
 // TODO:
+//
+// FFT:
 //   stereo support (and maybe different bitrates?)
 //   Optimization: don't copy filename in buffer?
 //   understand consumption rate
 //   understand BIN2HZ
 //   understand values and sizes (DFT_TOTAL, DFT_NONZERO, etc)
 //     note that wave and spectrum have different sizes
+//   clear fft when not in use
 //
 //   MPD interface
+//
+// Keyboard interface:
+//   Frame rate limit
+//   Clean up reconnect code
+//   Better log messages
+//
+//   Get parameters from keyboard (width, height, etc)
+//
+// Later:
 //   beat detection
-
+//   waveform animation
-
-// How many keys in a column * resolution per key.
-// this MUST fit inside a uint8_t.
-const uint8_t kb_resolution = 5 * 50;
-
-// How many resolution steps to skip at the top and bottom.
-const size_t bottom_skip = 25;
-const size_t top_skip = 50;
 
 
 const size_t width = 10;
-const size_t height = bottom_skip + kb_resolution + top_skip;
+const size_t height = BOTTOM_SKIP + KB_RESOLUTION + TOP_SKIP;
 
 
 int main(int argc, char *argv[]) {
@@ -51,8 +53,7 @@ int main(int argc, char *argv[]) {
 
 	// FFT generator
 	FFT_Visualizer fft = FFT_Visualizer(
-		width, height,
+		width, height, MIN_HZ, MAX_HZ
-		100, 5000
 	);
 
 	// Audio buffer
@@ -64,20 +65,16 @@ int main(int argc, char *argv[]) {
 
 	// HID interface wrapper
 	Ergodox Dox = Ergodox::init(
-		0x3297,
+		HID_VENDOR_ID,
-		0x4976,
+		HID_PRODUCT_ID,
-		0x61,
+		HID_USAGE,
-		0xFF60
+		HID_USAGE_PAGE
 	);
 
 	// Write buffer
 	uint8_t hid_buf[Dox.packet_size];
 
-	wprintf(L"Trying to connect...\n");
+	Dox.connect_loop();
-	while (!Dox.is_connected()) {
-		Dox.try_connect();
-		std::this_thread::sleep_for(std::chrono::milliseconds(500));
-	}
 
 
 	while (1) {
@@ -90,11 +87,11 @@ int main(int argc, char *argv[]) {
 				hid_buf[0] = CMD_ANIM_DATA_fft;
 				for (size_t i = 0; i < 10; i++) {
 					// Get height from fft, apply bottom_skip
-					ssize_t h = fft.get_output()[i] - bottom_skip;
+					ssize_t h = fft.get_output()[i] - BOTTOM_SKIP;
 
 					// Enforce max and min
 					// max implicitly enforces top_skip
-					h = h>kb_resolution ? kb_resolution : h;
+					h = h>KB_RESOLUTION ? KB_RESOLUTION : h;
 					h = h<0 ? 0 : h;
 
 					hid_buf[i + 1] = h;
@@ -118,11 +115,7 @@ int main(int argc, char *argv[]) {
 				}
 			}
 		} else {
-			wprintf(L"Trying to connect...\n");
+			Dox.connect_loop();
-			while (!Dox.is_connected()) {
-				Dox.try_connect();
-				std::this_thread::sleep_for(std::chrono::milliseconds(500));
-			}
 		}
 	}