X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=usb%2Fcore%2Fcore.c;h=b1d04743e5c77078dfb3b6b6a68e5d303ae3ccc9;hb=e2f68eaaefb3045cd6e3d07a326ac7feeeda7bac;hp=47e236c1d59a295433e183d69e8b36381528f8be;hpb=31c91f98447bb3e72a8d45fa594dee6bda266071;p=ppcskel.git

diff --git a/usb/core/core.c b/usb/core/core.c
index 47e236c..b1d0474 100644
--- a/usb/core/core.c
+++ b/usb/core/core.c
@@ -100,11 +100,29 @@ usb_device *usb_add_device()
 	dev->epTogl[2] = 0;
 
 	char buf[64];
+	memset(buf, 0, sizeof(buf));
 
 	/* ask first 8 bytes of device descriptor with this special 
 	 * GET Descriptor Request, when device address = 0
 	 */
-	usb_control_msg(dev, 0x80, GET_DESCRIPTOR, 1, 0, 64, buf, 8, 0);
+
+	/*
+	 * see page 253 in usb_20.pdf
+	 * 
+	 * bmRequestType = 0x80 = 10000000B
+	 * bRequest = GET_DESCRIPTOR
+	 * wValue = DEVICE (Descriptor Type)
+	 * wIndex = 0
+	 * wLength = 8 (in Bytes!?)
+	 */
+	usb_control_msg(dev, 0x80, GET_DESCRIPTOR, DEVICE, 0, 8, buf, 8, 0);
+
+	/* 
+	 * length (here =64) should be "number of byte to transfer", not 
+	 * (as here) "number of bits to transfer.
+	 * ?
+	 */
+	//usb_control_msg(dev, 0x80, GET_DESCRIPTOR, 1, 0, 64, buf, 8, 0);
 	printf("===========\nafter usb control msg:\n");
 	hexdump(buf, sizeof(buf));