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/* ----------------------------------------------------------------------------
* 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.
* ----------------------------------------------------------------------------
*/
#if defined(usb_CDCAUDIO) || defined(usb_HIDAUDIO)
//-----------------------------------------------------------------------------
// Headers
//-----------------------------------------------------------------------------
// GENERAL
#include <utility/trace.h>
#include <utility/assert.h>
#include <utility/led.h>
// USB
#include <usb/device/core/USBD.h>
// AUDIO
#include <usb/common/audio/AUDGenericRequest.h>
#include <usb/common/audio/AUDFeatureUnitRequest.h>
#include "AUDDFunctionDriver.h"
#include "AUDDFunctionDriverDescriptors.h"
//-----------------------------------------------------------------------------
// Internal variables
//-----------------------------------------------------------------------------
/// USB audio speaker driver instance.
static AUDDSpeakerChannel auddSpeakerChannels[AUDD_NUMCHANNELS+1];
/// Intermediate storage variable for the mute status of a channel.
static unsigned char muted;
//-----------------------------------------------------------------------------
// Internal functions
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/// Changes the mute status of the given channel accordingly.
/// \param channel Number of the channel whose mute status has changed.
//-----------------------------------------------------------------------------
static void AUDD_MuteReceived(unsigned char channel)
{
AUDDSpeakerChannel *pChannel = &auddSpeakerChannels[channel];
if (muted) {
if (!pChannel->muted) {
pChannel->muted = 1;
AUDDSpeakerChannel_MuteChanged(pChannel, 1);
}
}
else {
if (pChannel->muted) {
pChannel->muted = 0;
AUDDSpeakerChannel_MuteChanged(pChannel, 0);
}
}
USBD_Write(0, 0, 0, 0, 0);
}
//-----------------------------------------------------------------------------
/// Sets the current value of a particular Feature control of a channel.
/// \param channel Number of the channel whose feature will change.
/// \param control The feature control that will change.
/// \param length The feature data size.
//-----------------------------------------------------------------------------
static void AUDD_SetFeatureCurrentValue(unsigned char channel,
unsigned char control,
unsigned short length)
{
TRACE_INFO_WP("sFeature ");
TRACE_DEBUG("\b(CS%d, CN%d, L%d) ", control, channel, length);
// Check the the requested control is supported
// Mute control on master channel
if ((control == AUDFeatureUnitRequest_MUTE)
&& (channel < (AUDD_NUMCHANNELS+1))
&& (length == 1)) {
unsigned int argument = channel; // Avoids compiler warning
USBD_Read(0, // Endpoint #0
&muted,
sizeof(muted),
(TransferCallback) AUDD_MuteReceived,
(void *) argument);
}
// Control/channel combination not supported
else {
USBD_Stall(0);
}
}
//-----------------------------------------------------------------------------
/// Sends the current value of a particular channel Feature to the USB host.
/// \param channel Number of the channel whose feature will be sent.
/// \param control The feature control that will be sent.
/// \param length The feature data size.
//-----------------------------------------------------------------------------
static void AUDD_GetFeatureCurrentValue(unsigned char channel,
unsigned char control,
unsigned char length)
{
TRACE_INFO_WP("gFeature ");
TRACE_DEBUG("\b(CS%d, CN%d, L%d) ", control, channel, length);
// Check that the requested control is supported
// Master channel mute control
if ((control == AUDFeatureUnitRequest_MUTE)
&& (channel < (AUDD_NUMCHANNELS+1))
&& (length == 1)) {
muted = auddSpeakerChannels[channel].muted;
USBD_Write(0, &muted, sizeof(muted), 0, 0);
}
else {
USBD_Stall(0);
}
}
//-----------------------------------------------------------------------------
// Exported functions
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/// Initializes an USB audio speaker function driver
//-----------------------------------------------------------------------------
void AUDDFunctionDriver_Initialize()
{
auddSpeakerChannels[0].muted = 0;
auddSpeakerChannels[0].number = AUDD_MASTERCHANNEL;
auddSpeakerChannels[1].muted = 0;
auddSpeakerChannels[1].number = AUDD_LEFTCHANNEL;
auddSpeakerChannels[2].muted = 0;
auddSpeakerChannels[2].number = AUDD_RIGHTCHANNEL;
// Initialize the third LED to indicate when the audio interface is active
LED_Configure(USBD_LEDOTHER);
}
//-----------------------------------------------------------------------------
/// Handles AUDIO-specific USB requests sent by the host
/// \param request Pointer to a USBGenericRequest instance.
/// \return 0 if the request is Unsupported, 1 if the request handled.
//-----------------------------------------------------------------------------
unsigned char AUDDFunctionDriver_RequestHandler(
const USBGenericRequest *request)
{
unsigned char entity;
unsigned char interface;
// Check if the request is supported
switch (USBGenericRequest_GetRequest(request)) {
case AUDGenericRequest_SETCUR:
TRACE_INFO_WP(
"sCur(0x%04X) ",
USBGenericRequest_GetIndex(request));
// Check the target interface and entity
entity = AUDGenericRequest_GetEntity(request);
interface = AUDGenericRequest_GetInterface(request);
if ((entity == AUDD_Descriptors_FEATUREUNIT)
&& (interface == AUDD_Descriptors_CONTROL)) {
AUDD_SetFeatureCurrentValue(
AUDFeatureUnitRequest_GetChannel(request),
AUDFeatureUnitRequest_GetControl(request),
USBGenericRequest_GetLength(request));
}
else {
TRACE_WARNING(
"AUDDSpeakerDriver_RequestHandler: Unsupported entity/interface combination (0x%04X)\n\r",
USBGenericRequest_GetIndex(request));
USBD_Stall(0);
}
break;
case AUDGenericRequest_GETCUR:
TRACE_INFO_WP(
"gCur(0x%04X) ",
USBGenericRequest_GetIndex(request));
// Check the target interface and entity
entity = AUDGenericRequest_GetEntity(request);
interface = AUDGenericRequest_GetInterface(request);
if ((entity == AUDD_Descriptors_FEATUREUNIT)
&& (interface == AUDD_Descriptors_CONTROL)) {
AUDD_GetFeatureCurrentValue(
AUDFeatureUnitRequest_GetChannel(request),
AUDFeatureUnitRequest_GetControl(request),
USBGenericRequest_GetLength(request));
}
else {
TRACE_WARNING(
"AUDDSpeakerDriver_RequestHandler: Unsupported entity/interface combination (0x%04X)\n\r",
USBGenericRequest_GetIndex(request));
USBD_Stall(0);
}
break;
default:
return 0;
}
return 1;
}
//-----------------------------------------------------------------------------
/// Invoked whenever the active setting of an interface is changed by the
/// host. Changes the status of the third LED accordingly.
/// \param interface Interface number.
/// \param setting Newly active setting.
//-----------------------------------------------------------------------------
void AUDDFunctionCallbacks_InterfaceSettingChanged(unsigned char interface,
unsigned char setting)
{
if ((interface == AUDD_Descriptors_STREAMING) && (setting == 0)) {
LED_Clear(USBD_LEDOTHER);
}
else {
LED_Set(USBD_LEDOTHER);
}
}
//-----------------------------------------------------------------------------
/// Reads incoming audio data sent by the USB host into the provided buffer.
/// When the transfer is complete, an optional callback function is invoked.
/// \param buffer Pointer to the data storage buffer.
/// \param length Size of the buffer in bytes.
/// \param callback Optional callback function.
/// \param argument Optional argument to the callback function.
/// \return <USBD_STATUS_SUCCESS> if the transfer is started successfully;
/// otherwise an error code.
//-----------------------------------------------------------------------------
unsigned char AUDDSpeakerDriver_Read(void *buffer,
unsigned int length,
TransferCallback callback,
void *argument)
{
return USBD_Read(AUDD_Descriptors_DATAOUT,
buffer,
length,
callback,
argument);
}
#endif // (AUDIO defined)
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