move iso.c to transfer.c, as it's used for all transfers.

move transfer callback to transfer.go.

usb/iso.go

@@ -23,15 +23,8 @@ import "C"
 import (
 	"log"
 	"time"
-	"unsafe"
 )
 
-//export transfer_callback
-func transfer_callback(cptr unsafe.Pointer) {
-	ch := *(*chan struct{})(cptr)
-	close(ch)
-}
-
 func isochronous_xfer(e *endpoint, buf []byte, timeout time.Duration) (int, error) {
 	t, err := e.newUSBTransfer(TRANSFER_TYPE_ISOCHRONOUS, buf)
 	if err != nil {

usb/transfer.c

@@ -18,25 +18,15 @@
 #include <string.h>
 
 void print_xfer(struct libusb_transfer *xfer);
-void transfer_callback(void *);
+void xfer_callback(void *);
 
 void callback(struct libusb_transfer *xfer) {
-	//printf("Callback!\n");
+	xfer_callback(xfer->user_data);
-	//print_xfer(xfer);
-	transfer_callback(xfer->user_data);
 }
 
 int submit(struct libusb_transfer *xfer) {
 	xfer->callback = &callback;
 	xfer->status = -1;
-	//print_xfer(xfer);
-	//printf("Transfer submitted\n");
-
-	/* fake
-	strcpy(xfer->buffer, "hello");
-	xfer->actual_length = 5;
-	callback(xfer);
-	return 0; */
 	return libusb_submit_transfer(xfer);
 }
 

usb/transfer.go

@@ -29,6 +29,12 @@ import (
 	"unsafe"
 )
 
+//export xfer_callback
+func xfer_callback(cptr unsafe.Pointer) {
+	ch := *(*chan struct{})(cptr)
+	close(ch)
+}
+
 type usbTransfer struct {
 	xfer *C.struct_libusb_transfer
 	pkts []*C.struct_libusb_packet_descriptor