fix(hcd) hcd_edpt_open() return true if endpoint is already opened.

examples/host/device_info/src/main.c

@@ -124,13 +124,18 @@ void tuh_mount_cb(uint8_t daddr) {
   }
 
   printf("Device %u: ID %04x:%04x SN ", daddr, desc.device.idVendor, desc.device.idProduct);
+
+  xfer_result = XFER_RESULT_FAILED;
+  if (desc.device.iSerialNumber != 0) {
     xfer_result = tuh_descriptor_get_serial_string_sync(daddr, LANGUAGE_ID, desc.serial, sizeof(desc.serial));
+  }
   if (XFER_RESULT_SUCCESS != xfer_result) {
     uint16_t* serial = (uint16_t*)(uintptr_t) desc.serial;
-    serial[0] = 'n';
-    serial[1] = '/';
-    serial[2] = 'a';
-    serial[3] = 0;
+    serial[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * 3 + 2));
+    serial[1] = 'n';
+    serial[2] = '/';
+    serial[3] = 'a';
+    serial[4] = 0;
   }
   print_utf16((uint16_t*)(uintptr_t) desc.serial, sizeof(desc.serial)/2);
   printf("\r\n");
@@ -150,17 +155,21 @@ void tuh_mount_cb(uint8_t daddr) {
   // Get String descriptor using Sync API
 
   printf("  iManufacturer       %u     ", desc.device.iManufacturer);
+  if (desc.device.iManufacturer != 0) {
     xfer_result = tuh_descriptor_get_manufacturer_string_sync(daddr, LANGUAGE_ID, desc.buf, sizeof(desc.buf));
     if (XFER_RESULT_SUCCESS == xfer_result) {
       print_utf16((uint16_t*)(uintptr_t) desc.buf, sizeof(desc.buf)/2);
     }
+  }
   printf("\r\n");
 
   printf("  iProduct            %u     ", desc.device.iProduct);
+  if (desc.device.iProduct != 0) {
     xfer_result = tuh_descriptor_get_product_string_sync(daddr, LANGUAGE_ID, desc.buf, sizeof(desc.buf));
     if (XFER_RESULT_SUCCESS == xfer_result) {
       print_utf16((uint16_t*)(uintptr_t) desc.buf, sizeof(desc.buf)/2);
     }
+  }
   printf("\r\n");
 
   printf("  iSerialNumber       %u     ", desc.device.iSerialNumber);

src/host/hcd.h

@@ -163,6 +163,7 @@ void hcd_device_close(uint8_t rhport, uint8_t dev_addr);
 //--------------------------------------------------------------------+
 
 // Open an endpoint
+// return true if successfully opened or endpoint is currently opened
 bool hcd_edpt_open(uint8_t rhport, uint8_t daddr, tusb_desc_endpoint_t const * ep_desc);
 
 // Close an endpoint

src/portable/analog/max3421/hcd_max3421.c

@@ -611,7 +611,7 @@ bool hcd_edpt_open(uint8_t rhport, uint8_t daddr, tusb_desc_endpoint_t const * e
     ep = &_hcd_data.ep[0];
   }else {
     if (NULL != find_ep_not_addr0(daddr, ep_num, ep_dir)) {
-      return false; // endpoint already opened
+      return true; // already opened
     }
     ep = allocate_ep();
     TU_ASSERT(ep);

src/portable/ehci/ehci.c

@@ -381,7 +381,9 @@ bool hcd_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const
   if (ep_desc->bEndpointAddress == 0) {
     p_qhd = qhd_control(dev_addr);
   } else {
-    TU_VERIFY(NULL == qhd_get_from_addr(dev_addr, ep_desc->bEndpointAddress)); // ep not opened yet
+    if (NULL != qhd_get_from_addr(dev_addr, ep_desc->bEndpointAddress)) {
+      return true; // already opened
+    }
     p_qhd = qhd_find_free();
   }
   TU_ASSERT(p_qhd);