diff options
Diffstat (limited to 'usb-device-audio-speaker-project')
| -rw-r--r-- | usb-device-audio-speaker-project/Makefile | 241 | ||||
| -rw-r--r-- | usb-device-audio-speaker-project/bin/.empty_dir | 0 | ||||
| -rw-r--r-- | usb-device-audio-speaker-project/main.c | 835 | ||||
| -rw-r--r-- | usb-device-audio-speaker-project/obj/.empty_dir | 0 |
4 files changed, 1076 insertions, 0 deletions
diff --git a/usb-device-audio-speaker-project/Makefile b/usb-device-audio-speaker-project/Makefile new file mode 100644 index 0000000..2baa56e --- /dev/null +++ b/usb-device-audio-speaker-project/Makefile @@ -0,0 +1,241 @@ +# ----------------------------------------------------------------------------
+# 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 += $(COMP)/codec-wm8731 +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-speaker +VPATH += $(USB)/device/core
+VPATH += $(USB)/common/core
+VPATH += $(USB)/common/audio +
+# Objects built from C source files
+C_OBJECTS += main.o
+C_OBJECTS += wm8731.o
+C_OBJECTS += USBD_UDPHS.o
+C_OBJECTS += USBDDriver.o
+C_OBJECTS += USBDCallbacks_Initialized.o
+C_OBJECTS += USBDCallbacks_Reset.o
+#C_OBJECTS += USBDCallbacks_Resumed.o
+#C_OBJECTS += USBDCallbacks_Suspended.o
+C_OBJECTS += USBDDriverCb_CfgChanged.o
+#C_OBJECTS += USBDDriverCb_IfSettingChanged.o
+C_OBJECTS += USBInterfaceRequest.o
+C_OBJECTS += USBFeatureRequest.o
+C_OBJECTS += USBGenericRequest.o
+C_OBJECTS += USBGetDescriptorRequest.o
+C_OBJECTS += USBSetAddressRequest.o
+C_OBJECTS += USBSetConfigurationRequest.o
+C_OBJECTS += USBGenericDescriptor.o
+C_OBJECTS += USBConfigurationDescriptor.o
+C_OBJECTS += USBEndpointDescriptor.o
+C_OBJECTS += dbgu.o
+C_OBJECTS += pio.o
+C_OBJECTS += pio_it.o
+C_OBJECTS += ssc.o +C_OBJECTS += twi.o
+C_OBJECTS += pmc.o
+C_OBJECTS += led.o
+C_OBJECTS += twid.o
+C_OBJECTS += string.o
+C_OBJECTS += stdio.o
+C_OBJECTS += math.o +C_OBJECTS += trace.o +C_OBJECTS += board_memories.o
+C_OBJECTS += board_lowlevel.o
+ +C_OBJECTS += AUDDSpeakerDriverDescriptors.o AUDDSpeakerDriver.o +C_OBJECTS += AUDDSpeakerChannel.o +C_OBJECTS += AUDGenericRequest.o AUDFeatureUnitRequest.o + +
+# Objects for different chips
+ifeq ($(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-speaker-project/bin/.empty_dir b/usb-device-audio-speaker-project/bin/.empty_dir new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/usb-device-audio-speaker-project/bin/.empty_dir diff --git a/usb-device-audio-speaker-project/main.c b/usb-device-audio-speaker-project/main.c new file mode 100644 index 0000000..46e651a --- /dev/null +++ b/usb-device-audio-speaker-project/main.c @@ -0,0 +1,835 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ * Copyright (c) 2011, Harald Welte <laforge@gnumonks.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:
+ *
+ * - 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//-----------------------------------------------------------------------------
+/// \dir "USB audio speaker"
+///
+/// !!!Purpose
+///
+/// The USB Audio Speaker Project will help you to get familiar with the
+/// USB Device Port(UDP) and SSC interface 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.
+///
+/// You can find following information depends on your needs:
+/// - Sample usage of USB Audio Device Class driver and SSC-I2S driver.
+/// - USB Audio Class driver development based on the AT91 USB Framework.
+/// - USB enumerate sequence, the standard and class-specific descriptors and
+/// requests handling.
+/// - The initialize sequence and usage of UDP interface.
+/// - The initialize sequence and usage of SSC interface with PDC.
+///
+/// !See
+/// - ssc: SSC interface driver
+/// - "i2s-wm8731: I2S codec wm8731 driver
+/// - usb: USB Framework, Audio Device Class driver and UDP interface driver
+/// - "AT91 USB device framework"
+/// - "USBD API"
+/// - "audio-speaker"
+///
+/// !!!Requirements
+///
+/// This package can be used with all Atmel evaluation kits that have both
+/// UDP and SSC interface.
+///
+/// The current supported board list:
+/// - at91sam3u-ek
+///
+/// !!!Description
+///
+/// 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, and eventually sent to %audio DAC connected to AC97
+/// of AT91SAM chips. At the same time, the %audio stream received is also sent
+/// back to host from EK for recording.
+///
+/// !!!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/doc6224.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 Speaker Project 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, and it
+/// can be heard from the earphone connected to the EK.
+/// -# When playing sound, you can also record through the USB Audio Device on
+/// the host.
+///
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+/// \unit
+///
+/// !Purpose
+///
+/// This file contains all the specific code for the
+/// usb-device-audio-speaker-project
+///
+/// !Contents
+///
+/// The code can be roughly broken down as follows:
+/// - Configuration functions
+/// - VBus_Configure
+/// - PIO & Clock configurations in start of main
+/// - Interrupt handlers
+/// - ISR_SSC
+/// - Callback functions
+/// - AUDDSpeakerChannel_MuteChanged
+/// - FrameReceived
+/// - The main function, which implements the program behavior
+///
+/// Please refer to the list of functions in the #Overview# tab of this unit
+/// for more detailed information.
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include <board.h>
+#include <board_memories.h>
+#include <pio/pio.h>
+#include <pio/pio_it.h>
+#include <ssc/ssc.h>
+#include <irq/irq.h>
+#include <codec-wm8731/wm8731.h>
+#include <twi/twi.h>
+#include <twi/twid.h>
+#include <aic/aic.h>
+#include <dbgu/dbgu.h>
+#include <utility/trace.h>
+#include <utility/led.h>
+#include <usb/device/core/USBD.h>
+#include <usb/device/audio-speaker/AUDDSpeakerDriver.h>
+#include <usb/device/audio-speaker/AUDDSpeakerChannel.h>
+#include <pmc/pmc.h>
+
+#include <string.h>
+#include <stdio.h>
+
+#define AUDIO_USING_DMA
+#if defined(AUDIO_USING_DMA)
+#include <dmad/dmad.h>
+#include <dma/dma.h>
+#endif
+
+//------------------------------------------------------------------------------
+// Definitions
+//------------------------------------------------------------------------------
+
+/// Master clock frequency in Hz
+#define SSC_MCK 49152000
+
+// TWI clock
+#define TWI_CLOCK 100000
+
+/// Number of available audio buffers.
+#define BUFFER_NUMBER 5
+/// Size of one buffer in bytes.
+#define BUFFER_SIZE (AUDDSpeakerDriver_BYTESPERFRAME + \
+ AUDDSpeakerDriver_BYTESPERSUBFRAME)
+
+/// Delay in ms for starting the DAC transmission after a frame has been received.
+#define DAC_DELAY 2
+
+#define SAMPLE_RATE (48000)
+#define SLOT_BY_FRAME (2)
+#define BITS_BY_SLOT (16)
+
+#define AT91C_I2S_MASTER_TX_SETTING(nb_bit_by_slot, nb_slot_by_frame)( +\
+ AT91C_SSC_CKS_DIV +\
+ AT91C_SSC_CKO_CONTINOUS +\
+ AT91C_SSC_START_FALL_RF +\
+ ((1<<16) & AT91C_SSC_STTDLY) +\
+ ((((nb_bit_by_slot*nb_slot_by_frame)/2)-1) <<24))
+
+#define AT91C_I2S_TX_FRAME_SETTING(nb_bit_by_slot, nb_slot_by_frame)( +\
+ (nb_bit_by_slot-1) +\
+ AT91C_SSC_MSBF +\
+ (((nb_slot_by_frame-1)<<8) & AT91C_SSC_DATNB) +\
+ (((nb_bit_by_slot-1)<<16) & AT91C_SSC_FSLEN) +\
+ AT91C_SSC_FSOS_NEGATIVE)
+
+// PMC define
+#define AT91C_CKGR_PLLR AT91C_CKGR_PLLAR
+#define AT91C_PMC_LOCK AT91C_PMC_LOCKA
+
+#define AT91C_CKGR_MUL_SHIFT 16
+#define AT91C_CKGR_OUT_SHIFT 14
+#define AT91C_CKGR_PLLCOUNT_SHIFT 8
+#define AT91C_CKGR_DIV_SHIFT 0
+
+/// 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 unsigned char buffers[BUFFER_NUMBER][BUFFER_SIZE];
+/// Number of bytes stored in each data buffer.
+static volatile unsigned int bufferSizes[BUFFER_NUMBER];
+/// Next buffer in which USB data can be stored.
+static volatile unsigned int inBufferIndex = 0;
+/// Next buffer which should be sent to the DAC.
+static volatile unsigned int outBufferIndex = 0;
+/// Number of buffers that can be sent to the DAC.
+static volatile unsigned int numBuffersToSend = 0;
+
+/// Current state of the DAC transmission.
+static volatile unsigned int isDacActive = 0;
+/// Number of buffers to wait for before the DAC starts to transmit data.
+static volatile unsigned int dacDelay;
+
+/// List of pins to configure for the application.
+static const Pin pins[] = {PINS_TWI0, PINS_SSC_CODEC, PIN_PCK0};
+
+static Twid twid;
+
+//------------------------------------------------------------------------------
+// VBus monitoring (optional)
+//------------------------------------------------------------------------------
+#if defined(PIN_USB_VBUS)
+
+#define VBUS_CONFIGURE() VBus_Configure()
+
+/// 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 )
+{
+ TRACE_INFO("VBus configuration\n\r");
+
+ // 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
+ TRACE_INFO("VBUS conn\n\r");
+ USBD_Connect();
+ }
+ else {
+ TRACE_INFO("VBUS discon\n\r");
+ USBD_Disconnect();
+ }
+}
+
+#else
+ #define VBUS_CONFIGURE() USBD_Connect()
+#endif //#if defined(PIN_USB_VBUS)
+
+#if defined (CP15_PRESENT)
+//------------------------------------------------------------------------------
+/// Put the CPU in 32kHz, disable PLL, main oscillator
+/// Put voltage regulator in standby mode
+//------------------------------------------------------------------------------
+void LowPowerMode(void)
+{
+ PMC_CPUInIdleMode();
+}
+//------------------------------------------------------------------------------
+/// Put voltage regulator in normal mode
+/// Return the CPU to normal speed 48MHz, enable PLL, main oscillator
+//------------------------------------------------------------------------------
+void NormalPowerMode(void)
+{
+}
+
+#elif defined(at91sam7a3)
+//------------------------------------------------------------------------------
+/// Put the CPU in 32kHz, disable PLL, main oscillator
+//------------------------------------------------------------------------------
+void LowPowerMode(void)
+{
+ // MCK=48MHz to MCK=32kHz
+ // MCK = SLCK/2 : change source first from 48 000 000 to 18. / 2 = 9M
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=SLCK : then change prescaler
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // disable PLL
+ AT91C_BASE_PMC->PMC_PLLR = 0;
+ // Disable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = 0;
+
+ PMC_DisableProcessorClock();
+}
+//------------------------------------------------------------------------------
+/// Return the CPU to normal speed 48MHz, enable PLL, main oscillator
+//------------------------------------------------------------------------------
+void NormalPowerMode(void)
+{
+ // MCK=32kHz to MCK=48MHz
+ // enable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = (( (AT91C_CKGR_OSCOUNT & (0x06 <<8)) | AT91C_CKGR_MOSCEN ));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS ) );
+
+ // enable PLL@96MHz
+ AT91C_BASE_PMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x0E) |
+ (AT91C_CKGR_PLLCOUNT & (28<<8)) |
+ (AT91C_CKGR_MUL & (0x48<<16)));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK ) );
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
+ // MCK=SLCK/2 : change prescaler first
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=PLLCK/2 : then change source
+ AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK ;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+}
+
+#elif defined (at91sam7se)
+//------------------------------------------------------------------------------
+/// Put the CPU in 32kHz, disable PLL, main oscillator
+/// Put voltage regulator in standby mode
+//------------------------------------------------------------------------------
+void LowPowerMode(void)
+{
+ // MCK=48MHz to MCK=32kHz
+ // MCK = SLCK/2 : change source first from 48 000 000 to 18. / 2 = 9M
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=SLCK : then change prescaler
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // disable PLL
+ AT91C_BASE_PMC->PMC_PLLR = 0;
+ // Disable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = 0;
+
+ // Voltage regulator in standby mode : Enable VREG Low Power Mode
+ AT91C_BASE_VREG->VREG_MR |= AT91C_VREG_PSTDBY;
+
+ PMC_DisableProcessorClock();
+}
+//------------------------------------------------------------------------------
+/// Put voltage regulator in normal mode
+/// Return the CPU to normal speed 48MHz, enable PLL, main oscillator
+//------------------------------------------------------------------------------
+void NormalPowerMode(void)
+{
+ // Voltage regulator in normal mode : Disable VREG Low Power Mode
+ AT91C_BASE_VREG->VREG_MR &= ~AT91C_VREG_PSTDBY;
+
+ // MCK=32kHz to MCK=48MHz
+ // enable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = (( (AT91C_CKGR_OSCOUNT & (0x06 <<8)) | AT91C_CKGR_MOSCEN ));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS ) );
+
+ // enable PLL@96MHz
+ AT91C_BASE_PMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x0E) |
+ (AT91C_CKGR_PLLCOUNT & (28<<8)) |
+ (AT91C_CKGR_MUL & (0x48<<16)));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK ) );
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
+ // MCK=SLCK/2 : change prescaler first
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=PLLCK/2 : then change source
+ AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK ;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+}
+
+#elif defined (at91sam7s)
+//------------------------------------------------------------------------------
+/// Put the CPU in 32kHz, disable PLL, main oscillator
+/// Put voltage regulator in standby mode
+//------------------------------------------------------------------------------
+void LowPowerMode(void)
+{
+ // MCK=48MHz to MCK=32kHz
+ // MCK = SLCK/2 : change source first from 48 000 000 to 18. / 2 = 9M
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=SLCK : then change prescaler
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // disable PLL
+ AT91C_BASE_PMC->PMC_PLLR = 0;
+ // Disable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = 0;
+
+ // Voltage regulator in standby mode : Enable VREG Low Power Mode
+ AT91C_BASE_VREG->VREG_MR |= AT91C_VREG_PSTDBY;
+
+ PMC_DisableProcessorClock();
+}
+
+//------------------------------------------------------------------------------
+/// Put voltage regulator in normal mode
+/// Return the CPU to normal speed 48MHz, enable PLL, main oscillator
+//------------------------------------------------------------------------------
+void NormalPowerMode(void)
+{
+ // Voltage regulator in normal mode : Disable VREG Low Power Mode
+ AT91C_BASE_VREG->VREG_MR &= ~AT91C_VREG_PSTDBY;
+
+ // MCK=32kHz to MCK=48MHz
+ // enable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = (( (AT91C_CKGR_OSCOUNT & (0x06 <<8)) | AT91C_CKGR_MOSCEN ));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS ) );
+
+ // enable PLL@96MHz
+ AT91C_BASE_PMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x0E) |
+ (AT91C_CKGR_PLLCOUNT & (28<<8)) |
+ (AT91C_CKGR_MUL & (0x48<<16)));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK ) );
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
+ // MCK=SLCK/2 : change prescaler first
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=PLLCK/2 : then change source
+ AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK ;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+
+}
+
+#elif defined (at91sam7x) || defined (at91sam7xc)
+//------------------------------------------------------------------------------
+/// Put the CPU in 32kHz, disable PLL, main oscillator
+/// Put voltage regulator in standby mode
+//------------------------------------------------------------------------------
+void LowPowerMode(void)
+{
+ // MCK=48MHz to MCK=32kHz
+ // MCK = SLCK/2 : change source first from 48 000 000 to 18. / 2 = 9M
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=SLCK : then change prescaler
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // disable PLL
+ AT91C_BASE_PMC->PMC_PLLR = 0;
+ // Disable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = 0;
+
+ // Voltage regulator in standby mode : Enable VREG Low Power Mode
+ AT91C_BASE_VREG->VREG_MR |= AT91C_VREG_PSTDBY;
+
+ PMC_DisableProcessorClock();
+}
+
+//------------------------------------------------------------------------------
+/// Put voltage regulator in normal mode
+/// Return the CPU to normal speed 48MHz, enable PLL, main oscillator
+//------------------------------------------------------------------------------
+void NormalPowerMode(void)
+{
+ // Voltage regulator in normal mode : Disable VREG Low Power Mode
+ AT91C_BASE_VREG->VREG_MR &= ~AT91C_VREG_PSTDBY;
+
+ // MCK=32kHz to MCK=48MHz
+ // enable Main Oscillator
+ AT91C_BASE_PMC->PMC_MOR = (( (AT91C_CKGR_OSCOUNT & (0x06 <<8)) | AT91C_CKGR_MOSCEN ));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS ) );
+
+ // enable PLL@96MHz
+ AT91C_BASE_PMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x0E) |
+ (AT91C_CKGR_PLLCOUNT & (28<<8)) |
+ (AT91C_CKGR_MUL & (0x48<<16)));
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK ) );
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
+ // MCK=SLCK/2 : change prescaler first
+ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+ // MCK=PLLCK/2 : then change source
+ AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK ;
+ while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+}
+#else
+//------------------------------------------------------------------------------
+/// Put the CPU in low power mode (for customer)
+//------------------------------------------------------------------------------
+static void LowPowerMode(void)
+{
+}
+
+//------------------------------------------------------------------------------
+/// Return the CPU to normal speed (for customer)
+//------------------------------------------------------------------------------
+static void NormalPowerMode(void)
+{
+}
+#endif
+
+
+//------------------------------------------------------------------------------
+// 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 channel Pointer to an AUDDSpeakerChannel instance.
+/// \param muted Indicates the new mute status of the channel.
+//------------------------------------------------------------------------------
+void AUDDSpeakerChannel_MuteChanged(
+ AUDDSpeakerChannel *channel,
+ unsigned char muted)
+{
+ // Master channel
+ if (AUDDSpeakerChannel_GetNumber(channel) == AUDDSpeakerDriver_MASTERCHANNEL) {
+
+ if (muted) {
+
+ TRACE_INFO("MuteMaster ");
+ //AT73C213_SetMuteStatus(1, 1);
+ }
+ else {
+
+ TRACE_INFO("UnmuteMaster ");
+ //AT73C213_SetMuteStatus(0, 0);
+ }
+ }
+}
+
+//------------------------------------------------------------------------------
+// Internal functions
+//------------------------------------------------------------------------------
+
+#if 0
+//------------------------------------------------------------------------------
+/// Handles interrupts coming from the SSC. Sends remaining audio buffers
+/// or stops the DAC transmission.
+//------------------------------------------------------------------------------
+static void ISR_SSC(void)
+{
+ if ((AT91C_BASE_SSC0->SSC_SR & AT91C_SSC_TXBUFE) != 0) {
+
+ // End of transmission
+ TRACE_DEBUG("End ");
+ SSC_DisableInterrupts(AT91C_BASE_SSC0,
+ AT91C_SSC_TXBUFE
+ | AT91C_SSC_ENDTX);
+ AT91C_BASE_SSC0->SSC_PTCR = AT91C_PDC_TXTDIS;
+ isDacActive = 0;
+ }
+ else if (numBuffersToSend > 0) {
+
+ // Check the number of available buffers
+ if (numBuffersToSend > DAC_DELAY) {
+
+ // Strip one sample on all channels
+ bufferSizes[outBufferIndex] -= AUDDSpeakerDriver_NUMCHANNELS;
+ }
+ else if (numBuffersToSend < DAC_DELAY) {
+
+ // Copy the last sample on all channels
+ memcpy(&buffers[outBufferIndex][bufferSizes[outBufferIndex]],
+ &buffers[outBufferIndex][bufferSizes[outBufferIndex] - AUDDSpeakerDriver_BYTESPERSUBFRAME],
+ AUDDSpeakerDriver_BYTESPERSUBFRAME);
+ bufferSizes[outBufferIndex] += AUDDSpeakerDriver_NUMCHANNELS;
+ }
+
+ // Load next buffer
+ SSC_WriteBuffer(AT91C_BASE_SSC0
+ buffers[outBufferIndex],
+ bufferSizes[outBufferIndex]);
+ outBufferIndex = (outBufferIndex + 1) % BUFFER_NUMBER;
+ numBuffersToSend--;
+ }
+ else {
+
+ SSC_DisableInterrupts(AT91C_BASE_SSC0,
+ AT91C_SSC_ENDTX);
+ }
+}
+#endif
+
+#if defined(AUDIO_USING_DMA)
+void HDMA_IrqHandler(void)
+{
+ unsigned intFlag = 1 << (BOARD_SSC_DMA_CHANNEL + 8);
+ if (numBuffersToSend > 0) {
+ SSC_WriteBuffer(AT91C_BASE_SSC0, buffers[outBufferIndex], bufferSizes[outBufferIndex]);
+ outBufferIndex = (outBufferIndex + 1) % BUFFER_NUMBER;
+
+ DMA_EnableIt(intFlag);
+ DMA_EnableChannel(BOARD_SSC_DMA_CHANNEL);
+ numBuffersToSend--;
+ } else {
+ DMA_DisableIt(intFlag);
+ DMA_DisableChannel(BOARD_SSC_DMA_CHANNEL);
+ SSC_DisableTransmitter(AT91C_BASE_SSC0);
+ }
+}
+#endif
+
+//------------------------------------------------------------------------------
+/// Invoked when a frame has been received.
+//------------------------------------------------------------------------------
+static void FrameReceived(unsigned int unused,
+ char status,
+ unsigned int transferred,
+ unsigned int remaining)
+{
+ bufferSizes[inBufferIndex] = transferred / AUDDSpeakerDriver_BYTESPERSAMPLE;
+ inBufferIndex = (inBufferIndex + 1) % BUFFER_NUMBER;
+ numBuffersToSend++;
+
+ TRACE_DEBUG("FrameReceived ");
+
+ // Start DAc transmission if necessary
+ if (!isDacActive) {
+
+ TRACE_DEBUG("Start ");
+ dacDelay = DAC_DELAY;
+ isDacActive = 1;
+ }
+ // Wait until a few buffers have been received
+ else if (dacDelay > 0) {
+
+ dacDelay--;
+ }
+ // Start sending buffers
+ else {
+#if defined(AUDIO_USING_DMA)
+ SSC_EnableTransmitter(AT91C_BASE_SSC0);
+
+ unsigned intFlag = 1 << (BOARD_SSC_DMA_CHANNEL + 8);
+ DMA_DisableIt(intFlag);
+ DMA_DisableChannel(BOARD_SSC_DMA_CHANNEL);
+
+ SSC_WriteBuffer(AT91C_BASE_SSC0,
+ buffers[outBufferIndex],
+ bufferSizes[outBufferIndex]);
+ outBufferIndex = (outBufferIndex + 1) % BUFFER_NUMBER;
+ numBuffersToSend--;
+#if 0
+ SSC_WriteBuffer(AT91C_BASE_SSC0,
+ buffers[outBufferIndex],
+ bufferSizes[outBufferIndex]);
+ outBufferIndex = (outBufferIndex + 1) % BUFFER_NUMBER;
+ numBuffersToSend--;
+#endif
+
+ DMA_EnableIt(intFlag);
+ DMA_EnableChannel(BOARD_SSC_DMA_CHANNEL);
+#else
+#error DMA required for audio!!
+#endif
+ }
+
+ // Receive next packet
+ AUDDSpeakerDriver_Read(buffers[inBufferIndex],
+ AUDDSpeakerDriver_BYTESPERFRAME,
+ (TransferCallback) FrameReceived,
+ 0); // No optional argument
+}
+
+//------------------------------------------------------------------------------
+// Exported functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Starts the driver and waits for an audio input stream to forward to the SSC.
+//------------------------------------------------------------------------------
+int main(void)
+{
+ TRACE_CONFIGURE(DBGU_STANDARD, 115200, BOARD_MCK);
+ printf("-- USB Device Audio Speaker Project %s --\n\r", SOFTPACK_VERSION);
+ printf("-- %s\n\r", BOARD_NAME);
+ printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
+
+ // Initialize all PIOs
+ PIO_Configure(pins, PIO_LISTSIZE(pins));
+
+ // Initialize PSRAM
+ BOARD_ConfigurePsram();
+
+ // Switch to Main clock
+ AT91C_BASE_PMC->PMC_MCKR = (AT91C_BASE_PMC->PMC_MCKR & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_MAIN_CLK;
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) == 0);
+
+ // Configure PLL to 98.285MHz
+ *AT91C_CKGR_PLLR = ((1 << 29) | (171 << AT91C_CKGR_MUL_SHIFT) \
+ | (0x0 << AT91C_CKGR_OUT_SHIFT) |(0x3f << AT91C_CKGR_PLLCOUNT_SHIFT) \
+ | (21 << AT91C_CKGR_DIV_SHIFT));
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK) == 0);
+
+ // Configure master clock in two operations
+ AT91C_BASE_PMC->PMC_MCKR = (( AT91C_PMC_PRES_CLK_2 | AT91C_PMC_CSS_PLLA_CLK) & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_MAIN_CLK;
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) == 0);
+ AT91C_BASE_PMC->PMC_MCKR = ( AT91C_PMC_PRES_CLK_2 | AT91C_PMC_CSS_PLLA_CLK);
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) == 0);
+
+ // DBGU reconfiguration
+ DBGU_Configure(DBGU_STANDARD, 115200, SSC_MCK);
+
+ // Configure and enable the TWI (required for accessing the DAC)
+ *AT91C_PMC_PCER = (1<< AT91C_ID_TWI0);
+ TWI_ConfigureMaster(AT91C_BASE_TWI0, TWI_CLOCK, SSC_MCK);
+ TWID_Initialize(&twid, AT91C_BASE_TWI0);
+
+ // Enable the DAC master clock
+ AT91C_BASE_PMC->PMC_PCKR[0] = AT91C_PMC_CSS_PLLA_CLK | AT91C_PMC_PRES_CLK_8;
+ AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_PCK0;
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_PCKRDY0) == 0);
+
+ // Initialize the audio DAC
+ WM8731_DAC_Init(&twid, WM8731_SLAVE_ADDRESS);
+
+ // Configure SSC
+ SSC_Configure(AT91C_BASE_SSC0,
+ AT91C_ID_SSC0,
+ SAMPLE_RATE * BITS_BY_SLOT * 2,
+ SSC_MCK);
+ SSC_ConfigureReceiver(AT91C_BASE_SSC0, 0, 0);
+ SSC_ConfigureTransmitter(AT91C_BASE_SSC0,
+ AT91C_I2S_MASTER_TX_SETTING(BITS_BY_SLOT, SLOT_BY_FRAME),
+ AT91C_I2S_TX_FRAME_SETTING( BITS_BY_SLOT, SLOT_BY_FRAME));
+ SSC_DisableTransmitter(AT91C_BASE_SSC0);
+
+#if defined(AUDIO_USING_DMA)
+ // Initialize DMA controller.
+ DMAD_Initialize(BOARD_SSC_DMA_CHANNEL, 0);
+ // Configure and enable the SSC interrupt
+ IRQ_ConfigureIT(AT91C_ID_HDMA, 0, HDMA_IrqHandler);
+ IRQ_EnableIT(AT91C_ID_HDMA);
+#endif
+
+ // USB audio driver initialization
+ AUDDSpeakerDriver_Initialize();
+
+ // connect if needed
+ VBUS_CONFIGURE();
+ while (USBD_GetState() < USBD_STATE_CONFIGURED);
+
+ // Infinite loop
+ while (1) {
+
+ if( USBState == STATE_SUSPEND ) {
+ TRACE_DEBUG("suspend !\n\r");
+ LowPowerMode();
+ USBState = STATE_IDLE;
+ }
+ if( USBState == STATE_RESUME ) {
+ // Return in normal MODE
+ TRACE_DEBUG("resume !\n\r");
+ NormalPowerMode();
+ USBState = STATE_IDLE;
+ }
+ // Read the incoming audio stream
+ AUDDSpeakerDriver_Read(buffers[inBufferIndex],
+ AUDDSpeakerDriver_BYTESPERFRAME,
+ (TransferCallback) FrameReceived,
+ 0); // No optional argument
+ }
+
+ return 0;
+}
+
diff --git a/usb-device-audio-speaker-project/obj/.empty_dir b/usb-device-audio-speaker-project/obj/.empty_dir new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/usb-device-audio-speaker-project/obj/.empty_dir |