Addition of USB files

cpu/avr/dev/usb/serial/uart_usb_lib.c

@@ -0,0 +1,197 @@
+/* This file has been prepared for Doxygen automatic documentation generation.*/
+/*! \file uart_usb_lib.c *********************************************************************
+ *
+ * \brief
+ *      This file controls the UART USB functions.
+ *
+ * \addtogroup usbstick
+ *
+ * \author
+ *      Atmel Corporation: http://www.atmel.com \n
+ *      Support email: avr@atmel.com
+ *
+ ******************************************************************************/
+/* Copyright (c) 2008  ATMEL Corporation
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   * Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+   * 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.
+   * Neither the name of the copyright holders nor the names of
+     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 AND CONTRIBUTORS "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 OWNER OR CONTRIBUTORS 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.
+*/
+
+/*_____ I N C L U D E S ____________________________________________________*/
+
+#include "config.h"
+#include "usb_drv.h"
+#include "usb_descriptors.h"
+#include "serial/cdc_task.h"
+#include "serial/uart_usb_lib.h"
+#include <stdio.h>
+
+/**
+ \addtogroup cdctask
+ @{
+ */
+
+/*_____ M A C R O S ________________________________________________________*/
+
+/*_____ D E F I N I T I O N ________________________________________________*/
+
+Uchar tx_counter;
+Uchar rx_counter;
+S_line_coding   line_coding;
+
+/*_____ D E C L A R A T I O N ______________________________________________*/
+
+
+int usb_stdout_putchar(char c, FILE *stream)
+	{
+    // send to USB port
+    // don't send anything if USB can't accept chars
+     Usb_select_endpoint(TX_EP);
+     if (!uart_usb_tx_ready())
+			return 0;
+	        
+	 // turn on LED
+	 vcptx_end_led();
+
+	uart_usb_putchar(c);
+	 
+	return 0;
+	}
+
+static FILE usb_stdout = FDEV_SETUP_STREAM(usb_stdout_putchar,
+					     NULL,
+					     _FDEV_SETUP_WRITE);
+
+/**
+  * @brief Initializes the uart_usb library
+  */
+void uart_usb_init(void)
+{
+  tx_counter = 0;
+  rx_counter = 0;
+}
+
+void uart_usb_set_stdout(void)
+{
+  stdout = &usb_stdout;
+}
+
+
+/**
+  * @brief This function checks if the USB emission buffer is ready to accept at
+  * at least 1 byte
+  *
+  * @retval TRUE if the firmware can write a new byte to transmit.
+  * @retval FALSE otherwise
+  */
+bit uart_usb_tx_ready(void)
+{
+  if (!Is_usb_write_enabled())
+  {
+    return FALSE;
+  }
+  return TRUE;
+}
+
+/**
+  * @brief This function fills the USB transmit buffer with the new data. This buffer
+  * is sent if complete. To flush this buffer before waiting full, launch
+  * the uart_usb_flush() function.
+  *
+  * @param data_to_send Data to send
+  *
+  * @return data_to_send Data that was sent
+  */
+int uart_usb_putchar(int data_to_send)
+{
+  	Usb_select_endpoint(VCP_TX_EP);
+    
+	if(!uart_usb_tx_ready()) return -1;
+	
+	Usb_write_byte(data_to_send);
+	tx_counter++;
+  	if(!Is_usb_write_enabled()) //If Endpoint full -> flush
+  	{
+   	uart_usb_flush();
+  	}
+	return data_to_send;
+}
+
+/** 
+  * @brief This function checks if a character has been received on the USB bus.
+  * 
+  * @return bit (true if a byte is ready to be read)
+  */
+bit uart_usb_test_hit(void)
+{
+  if (!rx_counter)
+  {
+    Usb_select_endpoint(VCP_RX_EP);
+    if (Is_usb_receive_out())
+    {
+      rx_counter = Usb_byte_counter();
+      if (!rx_counter)
+		{
+        Usb_ack_receive_out();
+		}
+    }
+  }
+  return (rx_counter!=0);
+}
+
+/** 
+  * @brief This function reads one byte from the USB bus
+  *
+  * If one byte is present in the USB fifo, this byte is returned. If no data
+  * is present in the USB fifo, this function waits for USB data.
+  * 
+  * @return U8 byte received
+  */
+char uart_usb_getchar(void)
+{
+  register Uchar data_rx;
+
+  Usb_select_endpoint(VCP_RX_EP);
+  if (!rx_counter) while (!uart_usb_test_hit());
+  data_rx=Usb_read_byte();
+  rx_counter--;
+  if (!rx_counter) Usb_ack_receive_out();
+  return data_rx;
+}
+
+
+/**
+  * @brief This function sends the data stored in the USB transmit buffer.
+  * This function does nothing if there is no data in the buffer.
+  */
+void uart_usb_flush (void)
+{
+   Usb_select_endpoint(VCP_TX_EP);
+   Usb_send_in();
+	tx_counter = 0;
+}
+
+/** @} */