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diff --git a/examples/obsolete/device/src/cdc_device_app.c b/examples/obsolete/device/src/cdc_device_app.c
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+/**************************************************************************/
+/*!
+ @file cdc_device_app.c
+ @author hathach (tinyusb.org)
+
+ @section LICENSE
+
+ Software License Agreement (BSD License)
+
+ Copyright (c) 2013, hathach (tinyusb.org)
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. Neither the name of the copyright holders nor the
+ names of its contributors may be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#include "cdc_device_app.h"
+
+#if CFG_TUD_CDC
+
+#include "common/tusb_fifo.h" // TODO refractor
+#include "app_os_prio.h"
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+enum { SERIAL_BUFFER_SIZE = 64 };
+
+//--------------------------------------------------------------------+
+// INTERNAL OBJECT & FUNCTION DECLARATION
+//--------------------------------------------------------------------+
+void cdc_serial_app_task(void* param);
+
+OSAL_TASK_DEF(cdc_task_def, "blinky", cdc_serial_app_task, CDC_SERIAL_APP_TASK_PRIO, 128);
+
+//--------------------------------------------------------------------+
+// tinyusb callbacks
+//--------------------------------------------------------------------+
+void cdc_serial_app_mount(uint8_t rhport)
+{
+}
+
+void cdc_serial_app_umount(uint8_t rhport)
+{
+
+}
+
+void tud_cdc_rx_cb(uint8_t itf)
+{
+
+}
+
+//--------------------------------------------------------------------+
+// APPLICATION CODE
+//--------------------------------------------------------------------+
+void cdc_serial_app_init(void)
+{
+ osal_task_create(&cdc_task_def);
+}
+
+tusb_error_t cdc_serial_subtask(void);
+
+void cdc_serial_app_task(void* param)
+{
+ (void) param;
+
+ OSAL_TASK_BEGIN
+ cdc_serial_subtask();
+ OSAL_TASK_END
+}
+
+tusb_error_t cdc_serial_subtask(void)
+{
+ OSAL_SUBTASK_BEGIN
+
+ if ( tud_mounted() && tud_cdc_available() )
+ {
+ uint8_t buf[64];
+
+ // read and echo back
+ uint32_t count = tud_cdc_read(buf, sizeof(buf));
+
+ tud_cdc_write(buf, count);
+ }
+
+ OSAL_SUBTASK_END
+}
+
+#endif