diff --git a/test_com.c b/test_com.c
index 21f8fe8..cd7552a 100644
--- a/test_com.c
+++ b/test_com.c
@@ -2,6 +2,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#define ID_VENDOR 0x0951
+#define ID_PRODUCT 0x01666
+
 // gcc file.c -l usb-1.0
 
 int main(){
@@ -40,12 +43,10 @@ int main(){
 
 		// detach kernel
 		for(int j=0; j<config_desc->bNumInterfaces; j++){
-			for(int k=0; k<config_desc->interface[j].num_altsetting; k++){
-				int interface = config_desc->interface[j].altsetting[k].bInterfaceNumber;
-				if(libusb_kernel_driver_active(handle, interface)){
-					status = libusb_detach_kernel_driver(handle, interface);
-					if(status != 0){ perror("libusb_detach_kernel_driver"); exit(-1); }
-				}
+			int interface = config_desc->interface[j].altsetting[0].bInterfaceNumber;
+			if(libusb_kernel_driver_active(handle, interface)){
+				status = libusb_detach_kernel_driver(handle, interface);
+				if(status != 0){ perror("libusb_detach_kernel_driver"); exit(-1); }
 			}
 		}
 		
@@ -55,23 +56,23 @@ int main(){
 		
 		// claim interfaces
 		for(int j=0; j<config_desc->bNumInterfaces; j++){
-			for(int k=0; k<config_desc->interface[j].num_altsetting; k++){
-				int interface = config_desc->interface[j].altsetting[k].bInterfaceNumber;
-				status = libusb_claim_interface(handle, interface);
-				if(status != 0){ perror("libusb_claim_interface"); exit(-1); }
-			}
-		}
-
-		/* ... some code ... */
-		// TODO endpoints
-
-		// release interfaces
-		for(int j=0; j<config_desc->bNumInterfaces; j++){
-			for(int k=0; k<config_desc->interface[j].num_altsetting; k++){
-				int interface = config_desc->interface[j].altsetting[k].bInterfaceNumber;
-				status = libusb_release_interface(handle, interface);
-				if(status != 0){ perror("libusb_release_interface"); exit(-1); }
+			libusb_interface_descriptor *interface_desc = config_desc->interface[j].altsetting[0];
+			
+			int interface = interface_desc->bInterfaceNumber;
+			status = libusb_claim_interface(handle, interface);
+			if(status != 0){ perror("libusb_claim_interface"); exit(-1); }
+			
+			// find endpoints
+			for(int k=0; k<interface_desc->bNumEndpoints; k++){
+				libusb_endpoint_descriptor *endpoint_desc = interface_desc->endpoints
+				
+				/* ... some code ... */
+				// TODO what to do next ?
 			}
+			
+			// release interfaces
+			status = libusb_release_interface(handle, interface);
+			if(status != 0){ perror("libusb_release_interface"); exit(-1); }
 		}
 		
 		// free config
diff --git a/test_list_all.c b/test_list_all.c
new file mode 100644
index 0000000..adf19e1
--- /dev/null
+++ b/test_list_all.c
@@ -0,0 +1,34 @@
+#include <libusb-1.0/libusb.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// gcc file.c -l usb-1.0
+
+int main(){
+	// init
+	libusb_context *context;
+	int status = libusb_init(&context);
+	if(status != 0){perror("libusb_init"); exit(-1);}
+
+	// devices list
+	libusb_device **devices;
+	ssize_t devices_count = libusb_get_device_list(context, &devices);
+	if(devices_count < 0){perror("libusb_get_device_list");exit(-1);}
+	for(int i=0; i<devices_count; i++){
+		libusb_device *device = devices[i];
+
+		struct libusb_device_descriptor desc;
+		int status = libusb_get_device_descriptor(device, &desc);
+		if(status != 0) continue;
+
+		uint8_t bus = libusb_get_bus_number(device);
+		uint8_t address = libusb_get_device_address(device);
+
+		printf("Device Found @ (Bus:Address) %d:%d\n", bus, address);
+		printf("Vendor ID 0x0%x\n", desc.idVendor);
+		printf("Product ID 0x0%x\n", desc.idProduct);
+	}
+	libusb_free_device_list(devices, 1);
+
+	libusb_exit(context);
+}
--
libgit2 0.21.2