add synchronous (blocking) support for usbh control transfer

- add synchronous version of all get descriptor API
- update bare example to use sync API for string descriptor
- change order of index, language_id in tuh_descriptor_get_string() to
match similar API of libusb
- add index to tuh_descriptor_get_hid_report()

src/host/usbh.h

@@ -52,6 +52,18 @@ struct tuh_control_xfer_s
   uintptr_t user_arg;
 };
 
+//--------------------------------------------------------------------+
+// APPLICATION CALLBACK
+//--------------------------------------------------------------------+
+
+//TU_ATTR_WEAK uint8_t tuh_attach_cb (tusb_desc_device_t const *desc_device);
+
+// Invoked when device is mounted (configured)
+TU_ATTR_WEAK void tuh_mount_cb (uint8_t daddr);
+
+/// Invoked when device is unmounted (bus reset/unplugged)
+TU_ATTR_WEAK void tuh_umount_cb(uint8_t daddr);
+
 //--------------------------------------------------------------------+
 // APPLICATION API
 //--------------------------------------------------------------------+
@@ -93,65 +105,101 @@ static inline bool tuh_ready(uint8_t daddr)
 }
 
 // Carry out a control transfer
-// true on success, false if there is on-going control transfer
-// Note: function is blocking if complete callback is NULL
+// true on success, false if there is on-going control transfer or incorrect parameters
+// Blocking if complete callback is NULL, in this case 'user_arg' must contain xfer_result_t variable
 bool tuh_control_xfer (uint8_t daddr, tuh_control_xfer_t const* xfer);
 
-// Carry out a control transfer
-// true on success, false if there is on-going control transfer
-// Note: function is blocking if complete callback is NULL
-//bool tuh_control_xfer (uint8_t daddr, tusb_control_request_t const* request, void* buffer,
-//                       tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
+// Sync (blocking) version of tuh_control_xfer()
+// return transfer result
+uint8_t tuh_control_xfer_sync(uint8_t daddr, tuh_control_xfer_t const* xfer, uint32_t timeout_ms);
 
-// Set Configuration
+// Set Configuration (control transfer)
 // config_num = 0 will un-configure device. Note: config_num = config_descriptor_index + 1
+// true on success, false if there is on-going control transfer or incorrect parameters
+// Blocking if complete callback is NULL, in this case 'user_arg' must contain xfer_result_t variable
 bool tuh_configuration_set(uint8_t daddr, uint8_t config_num,
                            tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-//------------- descriptors -------------//
+//--------------------------------------------------------------------+
+// Descriptors Asynchronous (non-blocking)
+//--------------------------------------------------------------------+
 
-// Get an descriptor
+// Get an descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
 bool tuh_descriptor_get(uint8_t daddr, uint8_t type, uint8_t index, void* buffer, uint16_t len,
                         tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get device descriptor
+// Get device descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
 bool tuh_descriptor_get_device(uint8_t daddr, void* buffer, uint16_t len,
                                tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get configuration descriptor
+// Get configuration descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
 bool tuh_descriptor_get_configuration(uint8_t daddr, uint8_t index, void* buffer, uint16_t len,
                                       tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get HID report descriptor
-bool tuh_descriptor_get_hid_report(uint8_t daddr, uint8_t itf_num, uint8_t desc_type, void* buffer, uint16_t len,
+// Get HID report descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
+bool tuh_descriptor_get_hid_report(uint8_t daddr, uint8_t itf_num, uint8_t desc_type, uint8_t index, void* buffer, uint16_t len,
                                    tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get string descriptor
-bool tuh_descriptor_get_string(uint8_t daddr, uint16_t language_id, uint8_t index, void* buffer, uint16_t len,
+// Get string descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
+// Blocking if complete callback is NULL, in this case 'user_arg' must contain xfer_result_t variable
+bool tuh_descriptor_get_string(uint8_t daddr, uint8_t index, uint16_t language_id, void* buffer, uint16_t len,
                                tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get manufacturer string descriptor
+// Get manufacturer string descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
 bool tuh_descriptor_get_manufacturer_string(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len,
                                             tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get product string descriptor
+// Get product string descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
 bool tuh_descriptor_get_product_string(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len,
                                        tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
-// Get serial string descriptor
+// Get serial string descriptor (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
 bool tuh_descriptor_get_serial_string(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len,
                                       tuh_control_xfer_cb_t complete_cb, uintptr_t user_arg);
 
 //--------------------------------------------------------------------+
-// APPLICATION CALLBACK
+// Descriptors Synchronous (blocking)
 //--------------------------------------------------------------------+
-//TU_ATTR_WEAK uint8_t tuh_attach_cb (tusb_desc_device_t const *desc_device);
 
-// Invoked when device is mounted (configured)
-TU_ATTR_WEAK void tuh_mount_cb (uint8_t daddr);
+// Sync (blocking) version of tuh_descriptor_get()
+// return transfer result
+uint8_t tuh_descriptor_get_sync(uint8_t daddr, uint8_t type, uint8_t index, void* buffer, uint16_t len, uint8_t timeout_ms);
 
-/// Invoked when device is unmounted (bus reset/unplugged)
-TU_ATTR_WEAK void tuh_umount_cb(uint8_t daddr);
+// Sync (blocking) version of tuh_descriptor_get_device()
+// return transfer result
+uint8_t tuh_descriptor_get_device_sync(uint8_t daddr, void* buffer, uint16_t len, uint8_t timeout_ms);
+
+// Sync (blocking) version of tuh_descriptor_get_configuration()
+// return transfer result
+uint8_t tuh_descriptor_get_configuration_sync(uint8_t daddr, uint8_t index, void* buffer, uint16_t len, uint8_t timeout_ms);
+
+// Sync (blocking) version of tuh_descriptor_get_hid_report()
+// return transfer result
+uint8_t tuh_descriptor_get_hid_report_sync(uint8_t daddr, uint8_t itf_num, uint8_t desc_type, uint8_t index, void* buffer, uint16_t len, uint8_t timeout_ms);
+
+// Sync (blocking) version of tuh_descriptor_get_string()
+// return transfer result
+uint8_t tuh_descriptor_get_string_sync(uint8_t daddr, uint8_t index, uint16_t language_id, void* buffer, uint16_t len, uint8_t timeout_ms);
+
+// Sync (blocking) version of tuh_descriptor_get_manufacturer_string()
+// return transfer result
+uint8_t tuh_descriptor_get_manufacturer_string_sync(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len, uint8_t timeout_ms);
+
+// Sync (blocking) version of tuh_descriptor_get_product_string()
+// return transfer result
+uint8_t tuh_descriptor_get_product_string_sync(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len, uint8_t timeout_ms);
+
+// Sync (blocking) version of tuh_descriptor_get_serial_string()
+// return transfer result
+uint8_t tuh_descriptor_get_serial_string_sync(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len, uint8_t timeout_ms);
 
 #ifdef __cplusplus
  }