add audio looprec project ported for sam3u-ek

4 files changed, 688 insertions, 0 deletions

diff --git a/usb-device-audio-looprec-project/Makefile b/usb-device-audio-looprec-project/Makefile
new file mode 100644
index 0000000..497fb8e
--- /dev/null
+++ b/usb-device-audio-looprec-project/Makefile
@@ -0,0 +1,239 @@
+# ----------------------------------------------------------------------------

+#         ATMEL Microcontroller Software Support 

+# ----------------------------------------------------------------------------

+# 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 disclaimer below.

+#

+# Atmel's name may not be used to endorse or promote products derived from

+# this software without specific prior written permission.

+#

+# DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

+# DISCLAIMED. IN NO EVENT SHALL ATMEL 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.

+# ----------------------------------------------------------------------------

+

+# 	Makefile for compiling the usb-device-core-project project

+

+#-------------------------------------------------------------------------------

+#		User-modifiable options

+#-------------------------------------------------------------------------------

+

+# Chip & board used for compilation

+# (can be overriden by adding CHIP=chip and BOARD=board to the command-line)

+CHIP  = at91sam3u4
+BOARD = at91sam3u-ek

+

+# Trace level used for compilation

+# (can be overriden by adding TRACE_LEVEL=#number to the command-line)

+# TRACE_LEVEL_DEBUG      5

+# TRACE_LEVEL_INFO       4

+# TRACE_LEVEL_WARNING    3

+# TRACE_LEVEL_ERROR      2

+# TRACE_LEVEL_FATAL      1

+# TRACE_LEVEL_NO_TRACE   0

+TRACE_LEVEL = 4

+

+# Optimization level, put in comment for debugging

+OPTIMIZATION = -Os

+

+# AT91 library directory

+AT91LIB = ../../at91lib

+

+# External library

+EXT_LIBS= ../external_libs

+

+# Output file basename

+OUTPUT = usb-device-core-project-$(BOARD)-$(CHIP)

+

+# Compile with chip specific features

+include $(AT91LIB)/boards/$(BOARD)/$(CHIP)/chip.mak

+

+# Compile for all memories available on the board (this sets $(MEMORIES))

+include $(AT91LIB)/boards/$(BOARD)/board.mak

+

+# Output directories

+BIN = bin

+OBJ = obj

+

+#-------------------------------------------------------------------------------

+#		Tools

+#-------------------------------------------------------------------------------

+

+# Tool suffix when cross-compiling

+CROSS_COMPILE = arm-none-eabi-

+

+# Compilation tools

+CC = $(CROSS_COMPILE)gcc

+SIZE = $(CROSS_COMPILE)size

+STRIP = $(CROSS_COMPILE)strip

+OBJCOPY = $(CROSS_COMPILE)objcopy

+

+# Flags

+INCLUDES += -I$(AT91LIB)/boards/$(BOARD)

+INCLUDES += -I$(AT91LIB)/peripherals

+INCLUDES += -I$(AT91LIB)/components

+INCLUDES += -I$(AT91LIB)/drivers
+INCLUDES += -I$(AT91LIB)

+INCLUDES += -I$(EXT_LIBS)

+INCLUDES += -I$(EXT_LIBS)/cmsis

+

+ifeq ($(CHIP_CORE), cortexm3)

+TARGET_OPTS = -mcpu=cortex-m3 -mthumb

+else

+TARGET_OPTS =

+endif

+

+CFLAGS += $(TARGET_OPTS)

+CFLAGS += -Wall -mlong-calls -ffunction-sections

+CFLAGS += -g $(OPTIMIZATION) $(INCLUDES) -D$(CHIP) -DTRACE_LEVEL=$(TRACE_LEVEL)

+ASFLAGS = $(TARGET_OPTS) -Wall -g $(OPTIMIZATION) $(INCLUDES) -D$(CHIP) -D__ASSEMBLY__

+LDFLAGS = -g $(OPTIMIZATION) -nostartfiles $(TARGET_OPTS) -Wl,--gc-sections

+

+#-------------------------------------------------------------------------------

+#		Files

+#-------------------------------------------------------------------------------

+

+# Directories where source files can be found

+PERIPH = $(AT91LIB)/peripherals

+BOARDS = $(AT91LIB)/boards

+UTILITY = $(AT91LIB)/utility

+COMP = $(AT91LIB)/components
+DRIVER = $(AT91LIB)/drivers
+USB  = $(AT91LIB)/usb

+

+VPATH += $(UTILITY)
+VPATH += $(PERIPH)/dbgu

+VPATH += $(PERIPH)/pio

+VPATH += $(PERIPH)/irq

+VPATH += $(PERIPH)/ssc

+VPATH += $(PERIPH)/twi

+VPATH += $(PERIPH)/pmc

+VPATH += $(PERIPH)/cp15

+VPATH += $(BOARDS)/$(BOARD)

+VPATH += $(BOARDS)/$(BOARD)/$(CHIP)

+VPATH += $(DRIVER)/twi
+VPATH += $(PERIPH)/mci
+VPATH += $(PERIPH)/dma
+VPATH += $(DRIVER)/dmad
+VPATH += $(EXT_LIBS)/cmsis

+
+VPATH += $(USB)/device/audio-looprec
+VPATH += $(USB)/device/core

+VPATH += $(USB)/common/core

+VPATH += $(USB)/common/audio
+

+# Objects built from C source files

+C_OBJECTS += main.o

+C_OBJECTS += USBD_UDPHS.o

+C_OBJECTS += USBDDriver.o

+C_OBJECTS += USBDCallbacks_Initialized.o

+C_OBJECTS += USBDCallbacks_Reset.o

+#C_OBJECTS += USBDCallbacks_Resumed.o

+#C_OBJECTS += USBDCallbacks_Suspended.o

+C_OBJECTS += USBDDriverCb_CfgChanged.o

+#C_OBJECTS += USBDDriverCb_IfSettingChanged.o

+C_OBJECTS += USBInterfaceRequest.o

+C_OBJECTS += USBFeatureRequest.o

+C_OBJECTS += USBGenericRequest.o

+C_OBJECTS += USBGetDescriptorRequest.o

+C_OBJECTS += USBSetAddressRequest.o

+C_OBJECTS += USBSetConfigurationRequest.o

+C_OBJECTS += USBGenericDescriptor.o

+C_OBJECTS += USBConfigurationDescriptor.o

+C_OBJECTS += USBEndpointDescriptor.o

+C_OBJECTS += dbgu.o

+C_OBJECTS += pio.o

+C_OBJECTS += pio_it.o

+C_OBJECTS += ssc.o
+C_OBJECTS += twi.o

+C_OBJECTS += pmc.o

+C_OBJECTS += led.o

+C_OBJECTS += twid.o

+C_OBJECTS += string.o

+C_OBJECTS += stdio.o

+C_OBJECTS += math.o
+C_OBJECTS += trace.o
+C_OBJECTS += board_memories.o

+C_OBJECTS += board_lowlevel.o

+
+C_OBJECTS += AUDGenericRequest.o AUDFeatureUnitRequest.o
+C_OBJECTS += AUDDLoopRecChannel.o AUDDLoopRecDriver.o
+C_OBJECTS += AUDDLoopRecDriverDescriptors.o
+
+

+# Objects for different chips

+ifeq ($(CHIP_CORE), cortexm3)

+C_OBJECTS += nvic.o

+C_OBJECTS += exceptions.o

+C_OBJECTS += board_cstartup_gnu.o

+C_OBJECTS += core_cm3.o

+else

+C_OBJECTS += aic.o

+C_OBJECTS += cp15.o

+endif

+
+ifeq ($(CHIP_IP_MCI), MCI_DMA)
+C_OBJECTS += dmad.o
+C_OBJECTS += dma.o
+C_OBJECTS += mci_hs.o
+else
+C_OBJECTS += mci.o
+endif
+

+# Objects built from Assembly source files

+ifneq ($(CHIP_CORE), cortexm3)

+ASM_OBJECTS += board_cstartup.o

+ASM_OBJECTS += cp15_asm.o

+endif

+

+# Append OBJ and BIN directories to output filename

+OUTPUT := $(BIN)/$(OUTPUT)

+

+#-------------------------------------------------------------------------------

+#		Rules

+#-------------------------------------------------------------------------------

+

+all: $(BIN) $(OBJ) $(MEMORIES)

+

+$(BIN) $(OBJ):

+	mkdir $@

+

+define RULES

+C_OBJECTS_$(1) = $(addprefix $(OBJ)/$(1)_, $(C_OBJECTS))

+ASM_OBJECTS_$(1) = $(addprefix $(OBJ)/$(1)_, $(ASM_OBJECTS))

+

+$(1): $$(ASM_OBJECTS_$(1)) $$(C_OBJECTS_$(1))

+	$(CC) $(LDFLAGS) -T"$(AT91LIB)/boards/$(BOARD)/$(CHIP)/$$@.lds" -o $(OUTPUT)-$$@.elf $$^

+	$(OBJCOPY) -O binary $(OUTPUT)-$$@.elf $(OUTPUT)-$$@.bin

+	$(SIZE) $$^ $(OUTPUT)-$$@.elf

+

+$$(C_OBJECTS_$(1)): $(OBJ)/$(1)_%.o: %.c Makefile $(OBJ) $(BIN)

+	$(CC) $(CFLAGS) -D$(1) -c -o $$@ $$<

+

+$$(ASM_OBJECTS_$(1)): $(OBJ)/$(1)_%.o: %.S Makefile $(OBJ) $(BIN)

+	$(CC) $(ASFLAGS) -D$(1) -c -o $$@ $$<

+

+debug_$(1): $(1)

+	perl ../resources/gdb/debug.pl $(OUTPUT)-$(1).elf

+

+endef

+

+$(foreach MEMORY, $(MEMORIES), $(eval $(call RULES,$(MEMORY))))

+

+clean:

+	-rm -f $(OBJ)/*.o $(BIN)/*.bin $(BIN)/*.elf

+

diff --git a/usb-device-audio-looprec-project/bin/.empty_dir b/usb-device-audio-looprec-project/bin/.empty_dir
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/usb-device-audio-looprec-project/bin/.empty_dir
diff --git a/usb-device-audio-looprec-project/main.c b/usb-device-audio-looprec-project/main.c
new file mode 100644
index 0000000..6723c97
--- /dev/null
+++ b/usb-device-audio-looprec-project/main.c
@@ -0,0 +1,449 @@
+/* ----------------------------------------------------------------------------

+ *         ATMEL Microcontroller Software Support

+ * ----------------------------------------------------------------------------

+ * Copyright (c) 2009, 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 disclaimer below.

+ *

+ * Atmel's name may not be used to endorse or promote products derived from

+ * this software without specific prior written permission.

+ *

+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

+ * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.

+ * ----------------------------------------------------------------------------

+ */

+/** \cond usb_audio_looprec

+ *  \page usb_audio_looprec USB Audio Loopback-Recorder Example

+ *

+ *  \section Purpose

+ *

+ *  The USB Audio Loopback-Recorder Example will help you to get

+ *  familiar with the USB Device Port(UDP) and DACC on AT91SAM microcontrollers.

+ *  Also it can help you to be familiar with the USB Framework that is used for

+ *  rapid development of USB-compliant class drivers such as USB Audio Device

+ *  class.

+ *

+ *  \section Requirements

+ *

+ *  This package can be used with SAM9XX5 evaluation kits that have both

+ *  UDP.

+ *

+ *  \section Description

+ *

+ *  The demo simulates an USB Desktop Speaker with Microphone which actually

+ *  does not "speak out" but loop back the sound as microphone input.

+ *

+ *  When an EK running this program connected to a host (PC for example), with

+ *  USB cable, the EK appears as a desktop speaker for the host. Then the host

+ *  can play sound through host software. The audio stream from the host is

+ *  then sent to the EK. At the same time, the audio stream received is also

+ *  sent back to host from EK for recording.

+ *

+ *  \section Usage

+ *

+ *  -# Build the program and download it inside the evaluation board. Please

+ *     refer to the

+ *     <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6421.pdf">

+ *     SAM-BA User Guide</a>, the

+ *     <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6310.pdf">

+ *     GNU-Based Software Development</a> application note or to the

+ *     <a href="ftp://ftp.iar.se/WWWfiles/arm/Guides/EWARM_UserGuide.ENU.pdf">

+ *     IAR EWARM User Guide</a>, depending on your chosen solution.

+ *  -# On the computer, open and configure a terminal application

+ *     (e.g. HyperTerminal on Microsoft Windows) with these settings:

+ *    - 115200 bauds

+ *    - 8 bits of data

+ *    - No parity

+ *    - 1 stop bit

+ *    - No flow control

+ *  -# Start the application.

+ *  -# In the terminal window, the following text should appear:

+ *  \code

+ *  -- USB Device Audio LoopREC Example xxx --

+ *  -- AT91xxxxxx-xx

+ *  -- Compiled: xxx xx xxxx xx:xx:xx --

+ *  \endcode

+ *  -# When connecting USB cable to windows, the LED blinks, and the host

+ *     reports a new USB device attachment (if it's the first time you connect

+ *     an audio speaker demo board to your host). You can find new

+ *     "USB Composite Device" and "USB Audio Device" appear in the hardware

+ *     device list.

+ *  -# You can play sound in host side through the USB Audio Device.

+ *     When playing sound, you can also record through the USB Audio Device on

+ *     the host.

+ *

+ *  \section References

+ *  - usb_audio_looprec/main.c

+ *  - ssc: SSC interface driver

+ *  - usb: USB Framework, Audio Device Class driver and UDP interface driver

+ *      - \ref usbd_framework

+ *         - \ref usbd_api

+ *      - \ref usbd_audio_rec_drv

+ *

+ */

+

+/**

+ *  \file

+ *

+ *  This file contains all the specific code for the

+ *  usb_audio_looprec example.

+ */

+

+/*----------------------------------------------------------------------------

+ *         Headers

+ *----------------------------------------------------------------------------*/

+

+#include <board.h>

+

+#include <stdio.h>

+#include <stdint.h>

+#include <stdbool.h>

+#include <stdbool.h>

+

+#include <irq/irq.h>

+#include <pio/pio.h>

+#include <pio/pio_it.h>

+#include <utility/trace.h>

+#include <utility/led.h>

+

+#include <usb/device/core/USBD.h>

+#include <usb/device/audio-looprec/AUDDLoopRecDriver.h>

+#include <usb/device/audio-looprec/AUDDLoopRecChannel.h>

+/*----------------------------------------------------------------------------

+ *         Definitions

+ *----------------------------------------------------------------------------*/

+

+/**  Number of available audio buffers. */

+#define BUFFER_NUMBER       8

+/**  Size of one buffer in bytes. */

+#define BUFFER_SIZE         (AUDDLoopRecDriver_BYTESPERFRAME*2)

+

+/// Use for power management

+#define STATE_IDLE    0

+/// The USB device is in suspend state

+#define STATE_SUSPEND 4

+/// The USB device is in resume state

+#define STATE_RESUME  5

+

+//------------------------------------------------------------------------------

+//         Internal variables

+//------------------------------------------------------------------------------

+/// State of USB, for suspend and resume

+unsigned char USBState = STATE_IDLE;

+

+/**  Data buffers for receiving audio frames from the USB host. */

+static uint8_t buffers[BUFFER_NUMBER][BUFFER_SIZE];

+/**  Number of samples stored in each data buffer. */

+static uint32_t bufferSizes[BUFFER_NUMBER];

+/**  Next buffer in which USB data can be stored. */

+static uint32_t inBufferIndex = 0;

+/**  Number of buffers that can be sent to the DAC. */

+static volatile uint32_t numBuffersToSend = 0;

+

+/**  Current state of the playback stream interface. */

+static volatile uint8_t isPlyActive = 0;

+/**  Current state of the record stream interface. */

+static volatile uint8_t isRecActive = 0;

+

+/*----------------------------------------------------------------------------

+ *         VBus monitoring (optional)

+ *----------------------------------------------------------------------------*/

+

+/**  VBus pin instance. */

+static const Pin pinVbus = PIN_USB_VBUS;

+

+/**

+ *  Handles interrupts coming from PIO controllers.

+ */

+static void ISR_Vbus(const Pin *pPin)

+{

+    /* Check current level on VBus */

+    if (PIO_Get(&pinVbus))

+    {

+        TRACE_INFO("VBUS conn\n\r");

+        USBD_Connect();

+    }

+    else

+    {

+        TRACE_INFO("VBUS discon\n\r");

+        USBD_Disconnect();

+    }

+}

+

+/**

+ *  Configures the VBus pin to trigger an interrupt when the level on that pin

+ *  changes.

+ */

+static void VBus_Configure( void )

+{

+    /* Configure PIO */

+    PIO_Configure(&pinVbus, 1);

+    PIO_ConfigureIt(&pinVbus, ISR_Vbus);

+    PIO_EnableIt(&pinVbus);

+

+    /* Check current level on VBus */

+    if (PIO_Get(&pinVbus))

+    {

+        /* if VBUS present, force the connect */

+        USBD_Connect();

+    }

+    else

+    {

+        TRACE_INFO("discon\n\r");

+        USBD_Disconnect();

+    }

+}

+

+/*----------------------------------------------------------------------------

+ *         USB Power Control

+ *----------------------------------------------------------------------------*/

+

+#ifdef PIN_USB_POWER_ENA

+/** Power Enable A (MicroAB Socket) pin instance. */

+static const Pin pinPOnA = PIN_USB_POWER_ENA;

+#endif

+#ifdef PIN_USB_POWER_ENB

+/** Power Enable B (A Socket) pin instance. */

+static const Pin pinPOnB = PIN_USB_POWER_ENB;

+#endif

+#ifdef PIN_USB_POWER_ENC

+/** Power Enable C (A Socket) pin instance. */

+static const Pin pinPOnC = PIN_USB_POWER_ENC;

+#endif

+/**

+ * Configures the Power Enable pin to disable self power.

+ */

+static void USBPower_Configure( void )

+{

+  #ifdef PIN_USB_POWER_ENA

+    PIO_Configure(&pinPOnA, 1);

+  #endif

+  #ifdef PIN_USB_POWER_ENB

+    PIO_Configure(&pinPOnB, 1);

+  #endif

+  #ifdef PIN_USB_POWER_ENC

+    PIO_Configure(&pinPOnC, 1);

+  #endif

+}

+

+/*----------------------------------------------------------------------------

+ *         Internal functions

+ *----------------------------------------------------------------------------*/

+

+/**

+ *  Invoked when a frame has been received.

+ */

+static void FrameReceived(uint32_t unused,

+                          uint8_t status,

+                          uint32_t transferred,

+                          uint32_t remaining)

+{

+    if (status == USBD_STATUS_SUCCESS)

+    {

+        /* Loopback! add this buffer to write list */

+        if (!isRecActive)  {}

+        else

+        {

+            AUDDLoopRecDriver_Write(buffers[inBufferIndex],

+                                         AUDDLoopRecDriver_BYTESPERFRAME,

+					 NULL, 0);

+        }

+

+        /* Update input status data */

+        bufferSizes[inBufferIndex] = transferred

+                                        / AUDDLoopRecDriver_BYTESPERSAMPLE;

+        inBufferIndex = (inBufferIndex + 1) % BUFFER_NUMBER;

+        numBuffersToSend++;

+

+    }

+    else if (status == USBD_STATUS_ABORTED)

+    {

+        /* Error , ABORT, add NULL buffer */

+        bufferSizes[inBufferIndex] = 0;

+        inBufferIndex = (inBufferIndex + 1) % BUFFER_NUMBER;

+        numBuffersToSend++;

+    }

+    else

+    {

+        /* Packet is discarded */

+    }

+

+    /* Receive next packet */

+    AUDDLoopRecDriver_Read(buffers[inBufferIndex],

+                           AUDDLoopRecDriver_BYTESPERFRAME,

+                           (TransferCallback) FrameReceived,

+                           0); // No optional argument

+}

+

+/*----------------------------------------------------------------------------

+ *         Callbacks re-implementation

+ *----------------------------------------------------------------------------*/

+

+//------------------------------------------------------------------------------

+/// Invoked when the USB device leaves the Suspended state. By default,

+/// configures the LEDs.

+//------------------------------------------------------------------------------

+void USBDCallbacks_Resumed(void)

+{

+    // Initialize LEDs

+    LED_Configure(USBD_LEDPOWER);

+    LED_Set(USBD_LEDPOWER);

+    LED_Configure(USBD_LEDUSB);

+    LED_Clear(USBD_LEDUSB);

+    USBState = STATE_RESUME;

+}

+

+//------------------------------------------------------------------------------

+/// Invoked when the USB device gets suspended. By default, turns off all LEDs.

+//------------------------------------------------------------------------------

+void USBDCallbacks_Suspended(void)

+{

+    // Turn off LEDs

+    LED_Clear(USBD_LEDPOWER);

+    LED_Clear(USBD_LEDUSB);

+    USBState = STATE_SUSPEND;

+}

+

+

+

+/**

+ *  Invoked when an audio channel get muted or unmuted. Mutes/unmutes the

+ *  channel at the DAC level.

+ *  \param mic      Microphone/Speaker stream changed.

+ *  \param channel  Channel number that changed.

+ *  \param muted    Indicates the new mute status of the channel.

+ */

+void AUDDLoopRecChannel_MuteChanged(AUDDLoopRecChannel *channel,

+                                        uint8_t muted)

+{

+    /* Speaker Master channel */

+    if (channel == AUDDLoopRecDriver_MASTERCHANNEL)

+    {

+        if (muted)

+        {

+            TRACE_WARNING("MuteMaster ");

+        }

+        else

+        {

+            TRACE_INFO("UnmuteMaster ");

+        }

+    }

+}

+

+#if 0

+/**

+ *  Invoked when an audio streaming interface setting changed.

+ *  Audio stream is automatically reseted.

+ *  Actually control streaming rate.

+ *  \param mic         Microphone/Speaker stream changed.

+ *  \param newSetting  New stream (interface) setting.

+ */

+void AUDDLoopRecDriver_StreamSettingChanged(uint8_t mic,

+                                                 uint8_t newSetting)

+{

+    /* Speaker stream */

+    if (!mic)

+    {

+        isPlyActive = (newSetting > 0);

+    }

+    else

+    {

+        isRecActive = (newSetting > 0);

+    }

+}

+#endif

+

+/*----------------------------------------------------------------------------

+ *         Exported functions

+ *----------------------------------------------------------------------------*/

+

+extern void USBD_IrqHandler(void);

+/**

+ *  \brief usb_audio_looprec Application entry point.

+ *

+ *  Starts the driver and waits for an audio input stream to forward to the DAC.

+ */

+int main(void)

+{

+    volatile uint8_t usbConn = 0;

+    volatile uint8_t plyOn = 0, recOn = 0;

+

+    printf("-- USB Device Audio LoopREC Example %s --\n\r", SOFTPACK_VERSION);

+    printf("-- %s\n\r", BOARD_NAME);

+    printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);

+

+    /* If they are present, configure Vbus & Wake-up pins */

+    PIO_InitializeInterrupts(0);

+

+    /* Initialize all USB power (off) */

+    USBPower_Configure();

+

+    /* Audio STREAM LED */

+    LED_Configure(USBD_LEDOTHER);

+

+    /* Configure USB & DACC interrupt priority */

+    //IRQ_ConfigureIT( ID_UDPHS, 6, USBD_IrqHandler );

+

+    /* USB audio driver initialization */

+    AUDDLoopRecDriver_Initialize();

+

+    /* connect if needed */

+    VBus_Configure();

+

+    /* Infinite loop */

+    while (1)

+    {

+        if (USBD_GetState() < USBD_STATE_CONFIGURED)

+        {

+            usbConn = 0;

+            continue;

+        }

+        if (plyOn)

+        {

+            if (isPlyActive == 0)

+            {

+                printf("plyE ");

+                plyOn = 0;

+            }

+        }

+        else if (isPlyActive)

+        {

+            /* Try to Start Reading the incoming audio stream */

+            AUDDLoopRecDriver_Read(buffers[inBufferIndex],

+                                   AUDDLoopRecDriver_BYTESPERFRAME,

+                                   (TransferCallback) FrameReceived,

+                                   0); // No optional argument

+

+            printf("plyS ");

+            plyOn = 1;

+        }

+        if (recOn)

+        {

+            if (isRecActive == 0)

+            {

+                printf("recE ");

+                recOn = 0;

+            }

+        }

+        else if (isRecActive)

+        {

+            printf("recS ");

+            recOn = 1;

+        }

+    }

+}

+/** \endcond */

diff --git a/usb-device-audio-looprec-project/obj/.empty_dir b/usb-device-audio-looprec-project/obj/.empty_dir
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/usb-device-audio-looprec-project/obj/.empty_dir