Added basic HID intervace

src/test.cpp

@@ -8,6 +8,9 @@
 // Math libs
 #include <math.h>
 #include <fftw3.h>
+// HIDapi
+#include <wchar.h>
+#include "hidapi.h"
 
 // Local files
 #include "utility/bitmap.hpp"
@@ -15,6 +18,12 @@
 #include "signal_processing/fft.hpp"
 
 
+#define HID_VEND 0x3297
+#define HID_PROD 0x4976
+#define HID_USAGE 0x61
+#define HID_PAGE 0xff60
+
+
 // TODO:
 // stereo support (and maybe different bitrates?)
 // Optimization: don't copy filename in buffer?
@@ -28,6 +37,34 @@
 // beat detection
 
 
+hid_device* get_keyboard() {
+	struct hid_device_info *devs, *cur_dev;
+	const char *path_to_open = NULL;
+	hid_device *handle = NULL;
+
+	devs = hid_enumerate(HID_VEND, HID_PROD);
+	cur_dev = devs;
+	while (cur_dev) {
+		if (cur_dev->vendor_id == HID_VEND &&
+			cur_dev->product_id == HID_PROD &&
+			cur_dev->usage == HID_USAGE&&
+			cur_dev->usage_page == HID_PAGE
+		) {
+			path_to_open = cur_dev->path;
+			break;
+		}
+		cur_dev = cur_dev->next;
+	}
+
+	if (path_to_open) {
+		handle = hid_open_path(path_to_open);
+	} else {
+		wprintf(L"Could not find device, exiting.\n");
+		exit(1);
+	}
+	hid_free_enumeration(devs);
+	return handle;
+}
 
 
 void draw_spectrum_bitmap(
@@ -41,12 +78,22 @@ void draw_spectrum_bitmap(
 	}
 }
 
-const size_t width = 300;
-const size_t height = 100;
+const size_t width = 12;
+const size_t height = 150;
 
 
 int main(int argc, char *argv[]) {
 
+
+	// HID connect
+	int res;
+	uint8_t hid_buf[65];
+	hid_device *handle;
+	// Initialize the hidapi library
+	hid_init();
+	// Get Ergodox
+	handle = get_keyboard();
+
 	// buffer size for waveform:
 	// (44100 / fps * 10), make 10 bigger for slower scrolling
 	//
@@ -54,7 +101,7 @@ int main(int argc, char *argv[]) {
 
 	FFT_Visualizer fft = FFT_Visualizer(
 		width, height,
-		20, 20000
+		100, 10000
 	);
 
 	std::vector<size_t> waveform;
@@ -62,6 +109,7 @@ int main(int argc, char *argv[]) {
 
 	Buffer buf = Buffer(
 		"/tmp/mpd.fifo",
+		//"/home/mark/Workbench/sospi/pulse.fifo",
 		44100 / 2, // Keep 500ms of data in buffer
 		fft.compute_buffer_output_size()
 	);
@@ -69,10 +117,27 @@ int main(int argc, char *argv[]) {
 	Bitmap b = Bitmap(width, height);
 
 	while (1) {
-		b.clear();
+		//b.clear();
 		buf.update();
 		fft.update(buf);
-		draw_spectrum_bitmap(fft.get_output(), b);
-		b.save("/tmp/o.bmp");
+		//draw_spectrum_bitmap(fft.get_output(), b);
+		//b.save("/tmp/o.bmp");
+
+		hid_buf[0] = 0x01;
+		hid_buf[1] = 0x02;
+		for (size_t i = 0; i < 10; i++) {
+			ssize_t h = fft.get_output()[i + 1] - 10;
+			h = h>100 ? 100 : h;
+			h = h<0 ? 0 : h;
+			hid_buf[i + 2] = h;
+		}
+
+		res = hid_write(handle, hid_buf, 12);
 	}
+
+	// Close the device
+	hid_close(handle);
+	// Finalize the hidapi library
+	hid_exit();
+	return 0;
 }