Something happens if you start explore right after plugging in 4set

Makefile

@@ -2,12 +2,15 @@ CFLAGS += -Wall
 CFLAGS += -Werror
 CFLAGS += -g
 
-all: hdjd aac123
+all: hdjd aac123 explore
 
 hdjd: LDFLAGS += $(shell pkg-config --libs libusb-1.0)
 hdjd: LDFLAGS += $(shell pkg-config --libs alsa)
 hdjd: hdjd.o usb.o alsa.o
 
+explore: LDFLAGS += $(shell pkg-config --libs libusb-1.0)
+explore.o: CFLAGS += $(shell pkg-config --cflags libusb-1.0)
+
 alsa.o: CFLAGS += $(shell pkg-config --cflags alsa)
 usb.o: CFLAGS += $(shell pkg-config --cflags libusb-1.0)
 

explore.c

@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <libusb.h>
+#include <string.h>
+
+/*
+ * Some things I use for debugging 
+ */
+#ifdef NODUMP
+#define DUMPf(fmt, args...)
+#else
+#define DUMPf(fmt, args...) fprintf(stderr, "%s:%s:%d " fmt "\n", __FILE__, __FUNCTION__, __LINE__, ##args)
+#endif
+#define DUMP() DUMPf("")
+#define DUMP_d(v) DUMPf("%s = %d", #v, v)
+#define DUMP_x(v) DUMPf("%s = 0x%x", #v, v)
+#define DUMP_s(v) DUMPf("%s = %s", #v, v)
+#define DUMP_c(v) DUMPf("%s = '%c' (0x%02x)", #v, v, v)
+#define DUMP_p(v) DUMPf("%s = %p", #v, v)
+
+struct device {
+	uint16_t product_id;
+	uint8_t ep_in;
+	uint8_t ep_out;
+};
+
+const struct device devices[] = {
+	{0xb102, 0x83, 0x04},
+	{0xb105, 0x82, 0x03},
+	{0xb10c, 0x84, 0x02},
+	{0, 0, 0}
+};
+
+
+int
+main(int argc, char **argv)
+{
+	struct libusb_device_handle *dev;
+	struct libusb_device_descriptor ddesc;
+	unsigned char name[100];
+	const struct device *d;
+	int ret;
+
+	if (libusb_init(NULL) < 0) {
+		return 69;
+	}
+
+	for (d = devices; d->product_id; d += 1) {
+		dev = libusb_open_device_with_vid_pid(NULL, 0x6f8, d->product_id);
+		if (dev) {
+			break;
+		}
+	}
+	if (!dev) {
+		printf("Couldn't find a controller\n");
+		return 69;
+	}
+	// Figure out what this thing is called
+	libusb_get_device_descriptor(libusb_get_device(dev), &ddesc);
+	{
+		unsigned char *p = name;
+
+		ret = libusb_get_string_descriptor_ascii(dev, ddesc.iManufacturer, name, sizeof(name));
+		if (ret > 0) {
+			p = name + ret;
+			*p = ' ';
+			p += 1;
+			ret = libusb_get_string_descriptor_ascii(dev, ddesc.iProduct, p, sizeof(name) - ret - 1);
+		}
+
+		if (ret < 0) {
+			printf("Can't figure out what to call this thing.\n");
+			return 69;
+		}
+	}
+	printf("Opened a %s\n", name);
+
+
+	while (1) {
+		uint8_t data[8];
+		int transferred;
+		int i;
+
+		if ((ret = libusb_bulk_transfer(dev, d->ep_in, data, sizeof data, &transferred, 0))) {
+			break;
+		}
+
+		for (i = 0; i < transferred; i += 1) {
+			printf("%02x ", data[i]);
+		}
+		printf("\n");
+
+		//memset(data, 0xff, sizeof data);
+		libusb_bulk_transfer(dev, d->ep_out, data, sizeof data, &transferred, 0);
+
+	}
+
+	if (ret < 0) {
+		printf("ERROR: %s\n", libusb_error_name(ret));
+	}
+
+	libusb_exit(NULL);
+
+	return 0;
+}