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stm32-mw-usb-device/Class/AUDIO/Src/usbd_audio.c
slimih 555ce2b1f7 Release v2.11.0
2022-04-07 10:51:12 +01:00

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/**
******************************************************************************
* @file usbd_audio.c
* @author MCD Application Team
* @brief This file provides the Audio core functions.
*
*
******************************************************************************
* @attention
*
* Copyright (c) 2015 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
* @verbatim
*
* ===================================================================
* AUDIO Class Description
* ===================================================================
* This driver manages the Audio Class 1.0 following the "USB Device Class Definition for
* Audio Devices V1.0 Mar 18, 98".
* This driver implements the following aspects of the specification:
* - Device descriptor management
* - Configuration descriptor management
* - Standard AC Interface Descriptor management
* - 1 Audio Streaming Interface (with single channel, PCM, Stereo mode)
* - 1 Audio Streaming Endpoint
* - 1 Audio Terminal Input (1 channel)
* - Audio Class-Specific AC Interfaces
* - Audio Class-Specific AS Interfaces
* - AudioControl Requests: only SET_CUR and GET_CUR requests are supported (for Mute)
* - Audio Feature Unit (limited to Mute control)
* - Audio Synchronization type: Asynchronous
* - Single fixed audio sampling rate (configurable in usbd_conf.h file)
* The current audio class version supports the following audio features:
* - Pulse Coded Modulation (PCM) format
* - sampling rate: 48KHz.
* - Bit resolution: 16
* - Number of channels: 2
* - No volume control
* - Mute/Unmute capability
* - Asynchronous Endpoints
*
* @note In HS mode and when the DMA is used, all variables and data structures
* dealing with the DMA during the transaction process should be 32-bit aligned.
*
*
* @endverbatim
******************************************************************************
*/
/* BSPDependencies
- "stm32xxxxx_{eval}{discovery}.c"
- "stm32xxxxx_{eval}{discovery}_io.c"
- "stm32xxxxx_{eval}{discovery}_audio.c"
EndBSPDependencies */
/* Includes ------------------------------------------------------------------*/
#include "usbd_audio.h"
#include "usbd_ctlreq.h"
/** @addtogroup STM32_USB_DEVICE_LIBRARY
* @{
*/
/** @defgroup USBD_AUDIO
* @brief usbd core module
* @{
*/
/** @defgroup USBD_AUDIO_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @defgroup USBD_AUDIO_Private_Defines
* @{
*/
/**
* @}
*/
/** @defgroup USBD_AUDIO_Private_Macros
* @{
*/
#define AUDIO_SAMPLE_FREQ(frq) \
(uint8_t)(frq), (uint8_t)((frq >> 8)), (uint8_t)((frq >> 16))
#define AUDIO_PACKET_SZE(frq) \
(uint8_t)(((frq * 2U * 2U) / 1000U) & 0xFFU), (uint8_t)((((frq * 2U * 2U) / 1000U) >> 8) & 0xFFU)
#ifdef USE_USBD_COMPOSITE
#define AUDIO_PACKET_SZE_WORD(frq) (uint32_t)((((frq) * 2U * 2U)/1000U))
#endif /* USE_USBD_COMPOSITE */
/**
* @}
*/
/** @defgroup USBD_AUDIO_Private_FunctionPrototypes
* @{
*/
static uint8_t USBD_AUDIO_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx);
static uint8_t USBD_AUDIO_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx);
static uint8_t USBD_AUDIO_Setup(USBD_HandleTypeDef *pdev,
USBD_SetupReqTypedef *req);
#ifndef USE_USBD_COMPOSITE
static uint8_t *USBD_AUDIO_GetCfgDesc(uint16_t *length);
static uint8_t *USBD_AUDIO_GetDeviceQualifierDesc(uint16_t *length);
#endif /* USE_USBD_COMPOSITE */
static uint8_t USBD_AUDIO_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t USBD_AUDIO_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t USBD_AUDIO_EP0_RxReady(USBD_HandleTypeDef *pdev);
static uint8_t USBD_AUDIO_EP0_TxReady(USBD_HandleTypeDef *pdev);
static uint8_t USBD_AUDIO_SOF(USBD_HandleTypeDef *pdev);
static uint8_t USBD_AUDIO_IsoINIncomplete(USBD_HandleTypeDef *pdev, uint8_t epnum);
static uint8_t USBD_AUDIO_IsoOutIncomplete(USBD_HandleTypeDef *pdev, uint8_t epnum);
static void AUDIO_REQ_GetCurrent(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
static void AUDIO_REQ_SetCurrent(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
static void *USBD_AUDIO_GetAudioHeaderDesc(uint8_t *pConfDesc);
/**
* @}
*/
/** @defgroup USBD_AUDIO_Private_Variables
* @{
*/
USBD_ClassTypeDef USBD_AUDIO =
{
USBD_AUDIO_Init,
USBD_AUDIO_DeInit,
USBD_AUDIO_Setup,
USBD_AUDIO_EP0_TxReady,
USBD_AUDIO_EP0_RxReady,
USBD_AUDIO_DataIn,
USBD_AUDIO_DataOut,
USBD_AUDIO_SOF,
USBD_AUDIO_IsoINIncomplete,
USBD_AUDIO_IsoOutIncomplete,
#ifdef USE_USBD_COMPOSITE
NULL,
NULL,
NULL,
NULL,
#else
USBD_AUDIO_GetCfgDesc,
USBD_AUDIO_GetCfgDesc,
USBD_AUDIO_GetCfgDesc,
USBD_AUDIO_GetDeviceQualifierDesc,
#endif /* USE_USBD_COMPOSITE */
};
#ifndef USE_USBD_COMPOSITE
/* USB AUDIO device Configuration Descriptor */
__ALIGN_BEGIN static uint8_t USBD_AUDIO_CfgDesc[USB_AUDIO_CONFIG_DESC_SIZ] __ALIGN_END =
{
/* Configuration 1 */
0x09, /* bLength */
USB_DESC_TYPE_CONFIGURATION, /* bDescriptorType */
LOBYTE(USB_AUDIO_CONFIG_DESC_SIZ), /* wTotalLength */
HIBYTE(USB_AUDIO_CONFIG_DESC_SIZ),
0x02, /* bNumInterfaces */
0x01, /* bConfigurationValue */
0x00, /* iConfiguration */
#if (USBD_SELF_POWERED == 1U)
0xC0, /* bmAttributes: Bus Powered according to user configuration */
#else
0x80, /* bmAttributes: Bus Powered according to user configuration */
#endif /* USBD_SELF_POWERED */
USBD_MAX_POWER, /* MaxPower (mA) */
/* 09 byte*/
/* USB Speaker Standard interface descriptor */
AUDIO_INTERFACE_DESC_SIZE, /* bLength */
USB_DESC_TYPE_INTERFACE, /* bDescriptorType */
0x00, /* bInterfaceNumber */
0x00, /* bAlternateSetting */
0x00, /* bNumEndpoints */
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */
AUDIO_SUBCLASS_AUDIOCONTROL, /* bInterfaceSubClass */
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */
0x00, /* iInterface */
/* 09 byte*/
/* USB Speaker Class-specific AC Interface Descriptor */
AUDIO_INTERFACE_DESC_SIZE, /* bLength */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_CONTROL_HEADER, /* bDescriptorSubtype */
0x00, /* 1.00 */ /* bcdADC */
0x01,
0x27, /* wTotalLength */
0x00,
0x01, /* bInCollection */
0x01, /* baInterfaceNr */
/* 09 byte*/
/* USB Speaker Input Terminal Descriptor */
AUDIO_INPUT_TERMINAL_DESC_SIZE, /* bLength */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_CONTROL_INPUT_TERMINAL, /* bDescriptorSubtype */
0x01, /* bTerminalID */
0x01, /* wTerminalType AUDIO_TERMINAL_USB_STREAMING 0x0101 */
0x01,
0x00, /* bAssocTerminal */
0x01, /* bNrChannels */
0x00, /* wChannelConfig 0x0000 Mono */
0x00,
0x00, /* iChannelNames */
0x00, /* iTerminal */
/* 12 byte*/
/* USB Speaker Audio Feature Unit Descriptor */
0x09, /* bLength */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_CONTROL_FEATURE_UNIT, /* bDescriptorSubtype */
AUDIO_OUT_STREAMING_CTRL, /* bUnitID */
0x01, /* bSourceID */
0x01, /* bControlSize */
AUDIO_CONTROL_MUTE, /* bmaControls(0) */
0, /* bmaControls(1) */
0x00, /* iTerminal */
/* 09 byte */
/* USB Speaker Output Terminal Descriptor */
0x09, /* bLength */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_CONTROL_OUTPUT_TERMINAL, /* bDescriptorSubtype */
0x03, /* bTerminalID */
0x01, /* wTerminalType 0x0301 */
0x03,
0x00, /* bAssocTerminal */
0x02, /* bSourceID */
0x00, /* iTerminal */
/* 09 byte */
/* USB Speaker Standard AS Interface Descriptor - Audio Streaming Zero Bandwidth */
/* Interface 1, Alternate Setting 0 */
AUDIO_INTERFACE_DESC_SIZE, /* bLength */
USB_DESC_TYPE_INTERFACE, /* bDescriptorType */
0x01, /* bInterfaceNumber */
0x00, /* bAlternateSetting */
0x00, /* bNumEndpoints */
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */
0x00, /* iInterface */
/* 09 byte*/
/* USB Speaker Standard AS Interface Descriptor - Audio Streaming Operational */
/* Interface 1, Alternate Setting 1 */
AUDIO_INTERFACE_DESC_SIZE, /* bLength */
USB_DESC_TYPE_INTERFACE, /* bDescriptorType */
0x01, /* bInterfaceNumber */
0x01, /* bAlternateSetting */
0x01, /* bNumEndpoints */
USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */
AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */
AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */
0x00, /* iInterface */
/* 09 byte*/
/* USB Speaker Audio Streaming Interface Descriptor */
AUDIO_STREAMING_INTERFACE_DESC_SIZE, /* bLength */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */
0x01, /* bTerminalLink */
0x01, /* bDelay */
0x01, /* wFormatTag AUDIO_FORMAT_PCM 0x0001 */
0x00,
/* 07 byte*/
/* USB Speaker Audio Type III Format Interface Descriptor */
0x0B, /* bLength */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */
AUDIO_FORMAT_TYPE_I, /* bFormatType */
0x02, /* bNrChannels */
0x02, /* bSubFrameSize : 2 Bytes per frame (16bits) */
16, /* bBitResolution (16-bits per sample) */
0x01, /* bSamFreqType only one frequency supported */
AUDIO_SAMPLE_FREQ(USBD_AUDIO_FREQ), /* Audio sampling frequency coded on 3 bytes */
/* 11 byte*/
/* Endpoint 1 - Standard Descriptor */
AUDIO_STANDARD_ENDPOINT_DESC_SIZE, /* bLength */
USB_DESC_TYPE_ENDPOINT, /* bDescriptorType */
AUDIO_OUT_EP, /* bEndpointAddress 1 out endpoint */
USBD_EP_TYPE_ISOC, /* bmAttributes */
AUDIO_PACKET_SZE(USBD_AUDIO_FREQ), /* wMaxPacketSize in Bytes (Freq(Samples)*2(Stereo)*2(HalfWord)) */
AUDIO_FS_BINTERVAL, /* bInterval */
0x00, /* bRefresh */
0x00, /* bSynchAddress */
/* 09 byte*/
/* Endpoint - Audio Streaming Descriptor */
AUDIO_STREAMING_ENDPOINT_DESC_SIZE, /* bLength */
AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */
AUDIO_ENDPOINT_GENERAL, /* bDescriptor */
0x00, /* bmAttributes */
0x00, /* bLockDelayUnits */
0x00, /* wLockDelay */
0x00,
/* 07 byte*/
} ;
/* USB Standard Device Descriptor */
__ALIGN_BEGIN static uint8_t USBD_AUDIO_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_DESC] __ALIGN_END =
{
USB_LEN_DEV_QUALIFIER_DESC,
USB_DESC_TYPE_DEVICE_QUALIFIER,
0x00,
0x02,
0x00,
0x00,
0x00,
0x40,
0x01,
0x00,
};
#endif /* USE_USBD_COMPOSITE */
static uint8_t AUDIOOutEpAdd = AUDIO_OUT_EP;
/**
* @}
*/
/** @defgroup USBD_AUDIO_Private_Functions
* @{
*/
/**
* @brief USBD_AUDIO_Init
* Initialize the AUDIO interface
* @param pdev: device instance
* @param cfgidx: Configuration index
* @retval status
*/
static uint8_t USBD_AUDIO_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
{
UNUSED(cfgidx);
USBD_AUDIO_HandleTypeDef *haudio;
/* Allocate Audio structure */
haudio = (USBD_AUDIO_HandleTypeDef *)USBD_malloc(sizeof(USBD_AUDIO_HandleTypeDef));
if (haudio == NULL)
{
pdev->pClassDataCmsit[pdev->classId] = NULL;
return (uint8_t)USBD_EMEM;
}
pdev->pClassDataCmsit[pdev->classId] = (void *)haudio;
pdev->pClassData = pdev->pClassDataCmsit[pdev->classId];
#ifdef USE_USBD_COMPOSITE
/* Get the Endpoints addresses allocated for this class instance */
AUDIOOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_ISOC, (uint8_t)pdev->classId);
#endif /* USE_USBD_COMPOSITE */
if (pdev->dev_speed == USBD_SPEED_HIGH)
{
pdev->ep_out[AUDIOOutEpAdd & 0xFU].bInterval = AUDIO_HS_BINTERVAL;
}
else /* LOW and FULL-speed endpoints */
{
pdev->ep_out[AUDIOOutEpAdd & 0xFU].bInterval = AUDIO_FS_BINTERVAL;
}
/* Open EP OUT */
(void)USBD_LL_OpenEP(pdev, AUDIOOutEpAdd, USBD_EP_TYPE_ISOC, AUDIO_OUT_PACKET);
pdev->ep_out[AUDIOOutEpAdd & 0xFU].is_used = 1U;
haudio->alt_setting = 0U;
haudio->offset = AUDIO_OFFSET_UNKNOWN;
haudio->wr_ptr = 0U;
haudio->rd_ptr = 0U;
haudio->rd_enable = 0U;
/* Initialize the Audio output Hardware layer */
if (((USBD_AUDIO_ItfTypeDef *)pdev->pUserData[pdev->classId])->Init(USBD_AUDIO_FREQ,
AUDIO_DEFAULT_VOLUME,
0U) != 0U)
{
return (uint8_t)USBD_FAIL;
}
/* Prepare Out endpoint to receive 1st packet */
(void)USBD_LL_PrepareReceive(pdev, AUDIOOutEpAdd, haudio->buffer,
AUDIO_OUT_PACKET);
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_Init
* DeInitialize the AUDIO layer
* @param pdev: device instance
* @param cfgidx: Configuration index
* @retval status
*/
static uint8_t USBD_AUDIO_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
{
UNUSED(cfgidx);
#ifdef USE_USBD_COMPOSITE
/* Get the Endpoints addresses allocated for this class instance */
AUDIOOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_ISOC, (uint8_t)pdev->classId);
#endif /* USE_USBD_COMPOSITE */
/* Open EP OUT */
(void)USBD_LL_CloseEP(pdev, AUDIOOutEpAdd);
pdev->ep_out[AUDIOOutEpAdd & 0xFU].is_used = 0U;
pdev->ep_out[AUDIOOutEpAdd & 0xFU].bInterval = 0U;
/* DeInit physical Interface components */
if (pdev->pClassDataCmsit[pdev->classId] != NULL)
{
((USBD_AUDIO_ItfTypeDef *)pdev->pUserData[pdev->classId])->DeInit(0U);
(void)USBD_free(pdev->pClassDataCmsit[pdev->classId]);
pdev->pClassDataCmsit[pdev->classId] = NULL;
pdev->pClassData = NULL;
}
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_Setup
* Handle the AUDIO specific requests
* @param pdev: instance
* @param req: usb requests
* @retval status
*/
static uint8_t USBD_AUDIO_Setup(USBD_HandleTypeDef *pdev,
USBD_SetupReqTypedef *req)
{
USBD_AUDIO_HandleTypeDef *haudio;
uint16_t len;
uint8_t *pbuf;
uint16_t status_info = 0U;
USBD_StatusTypeDef ret = USBD_OK;
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
if (haudio == NULL)
{
return (uint8_t)USBD_FAIL;
}
switch (req->bmRequest & USB_REQ_TYPE_MASK)
{
case USB_REQ_TYPE_CLASS:
switch (req->bRequest)
{
case AUDIO_REQ_GET_CUR:
AUDIO_REQ_GetCurrent(pdev, req);
break;
case AUDIO_REQ_SET_CUR:
AUDIO_REQ_SetCurrent(pdev, req);
break;
default:
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
break;
}
break;
case USB_REQ_TYPE_STANDARD:
switch (req->bRequest)
{
case USB_REQ_GET_STATUS:
if (pdev->dev_state == USBD_STATE_CONFIGURED)
{
(void)USBD_CtlSendData(pdev, (uint8_t *)&status_info, 2U);
}
else
{
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
}
break;
case USB_REQ_GET_DESCRIPTOR:
if ((req->wValue >> 8) == AUDIO_DESCRIPTOR_TYPE)
{
pbuf = (uint8_t *)USBD_AUDIO_GetAudioHeaderDesc(pdev->pConfDesc);
if (pbuf != NULL)
{
len = MIN(USB_AUDIO_DESC_SIZ, req->wLength);
(void)USBD_CtlSendData(pdev, pbuf, len);
}
else
{
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
}
}
break;
case USB_REQ_GET_INTERFACE:
if (pdev->dev_state == USBD_STATE_CONFIGURED)
{
(void)USBD_CtlSendData(pdev, (uint8_t *)&haudio->alt_setting, 1U);
}
else
{
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
}
break;
case USB_REQ_SET_INTERFACE:
if (pdev->dev_state == USBD_STATE_CONFIGURED)
{
if ((uint8_t)(req->wValue) <= USBD_MAX_NUM_INTERFACES)
{
haudio->alt_setting = (uint8_t)(req->wValue);
}
else
{
/* Call the error management function (command will be NAKed */
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
}
}
else
{
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
}
break;
case USB_REQ_CLEAR_FEATURE:
break;
default:
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
break;
}
break;
default:
USBD_CtlError(pdev, req);
ret = USBD_FAIL;
break;
}
return (uint8_t)ret;
}
#ifndef USE_USBD_COMPOSITE
/**
* @brief USBD_AUDIO_GetCfgDesc
* return configuration descriptor
* @param length : pointer data length
* @retval pointer to descriptor buffer
*/
static uint8_t *USBD_AUDIO_GetCfgDesc(uint16_t *length)
{
*length = (uint16_t)sizeof(USBD_AUDIO_CfgDesc);
return USBD_AUDIO_CfgDesc;
}
#endif /* USE_USBD_COMPOSITE */
/**
* @brief USBD_AUDIO_DataIn
* handle data IN Stage
* @param pdev: device instance
* @param epnum: endpoint index
* @retval status
*/
static uint8_t USBD_AUDIO_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
UNUSED(pdev);
UNUSED(epnum);
/* Only OUT data are processed */
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_EP0_RxReady
* handle EP0 Rx Ready event
* @param pdev: device instance
* @retval status
*/
static uint8_t USBD_AUDIO_EP0_RxReady(USBD_HandleTypeDef *pdev)
{
USBD_AUDIO_HandleTypeDef *haudio;
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
if (haudio == NULL)
{
return (uint8_t)USBD_FAIL;
}
if (haudio->control.cmd == AUDIO_REQ_SET_CUR)
{
/* In this driver, to simplify code, only SET_CUR request is managed */
if (haudio->control.unit == AUDIO_OUT_STREAMING_CTRL)
{
((USBD_AUDIO_ItfTypeDef *)pdev->pUserData[pdev->classId])->MuteCtl(haudio->control.data[0]);
haudio->control.cmd = 0U;
haudio->control.len = 0U;
}
}
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_EP0_TxReady
* handle EP0 TRx Ready event
* @param pdev: device instance
* @retval status
*/
static uint8_t USBD_AUDIO_EP0_TxReady(USBD_HandleTypeDef *pdev)
{
UNUSED(pdev);
/* Only OUT control data are processed */
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_SOF
* handle SOF event
* @param pdev: device instance
* @retval status
*/
static uint8_t USBD_AUDIO_SOF(USBD_HandleTypeDef *pdev)
{
UNUSED(pdev);
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_SOF
* handle SOF event
* @param pdev: device instance
* @param offset: audio offset
* @retval status
*/
void USBD_AUDIO_Sync(USBD_HandleTypeDef *pdev, AUDIO_OffsetTypeDef offset)
{
USBD_AUDIO_HandleTypeDef *haudio;
uint32_t BufferSize = AUDIO_TOTAL_BUF_SIZE / 2U;
if (pdev->pClassDataCmsit[pdev->classId] == NULL)
{
return;
}
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
haudio->offset = offset;
if (haudio->rd_enable == 1U)
{
haudio->rd_ptr += (uint16_t)BufferSize;
if (haudio->rd_ptr == AUDIO_TOTAL_BUF_SIZE)
{
/* roll back */
haudio->rd_ptr = 0U;
}
}
if (haudio->rd_ptr > haudio->wr_ptr)
{
if ((haudio->rd_ptr - haudio->wr_ptr) < AUDIO_OUT_PACKET)
{
BufferSize += 4U;
}
else
{
if ((haudio->rd_ptr - haudio->wr_ptr) > (AUDIO_TOTAL_BUF_SIZE - AUDIO_OUT_PACKET))
{
BufferSize -= 4U;
}
}
}
else
{
if ((haudio->wr_ptr - haudio->rd_ptr) < AUDIO_OUT_PACKET)
{
BufferSize -= 4U;
}
else
{
if ((haudio->wr_ptr - haudio->rd_ptr) > (AUDIO_TOTAL_BUF_SIZE - AUDIO_OUT_PACKET))
{
BufferSize += 4U;
}
}
}
if (haudio->offset == AUDIO_OFFSET_FULL)
{
((USBD_AUDIO_ItfTypeDef *)pdev->pUserData[pdev->classId])->AudioCmd(&haudio->buffer[0],
BufferSize, AUDIO_CMD_PLAY);
haudio->offset = AUDIO_OFFSET_NONE;
}
}
/**
* @brief USBD_AUDIO_IsoINIncomplete
* handle data ISO IN Incomplete event
* @param pdev: device instance
* @param epnum: endpoint index
* @retval status
*/
static uint8_t USBD_AUDIO_IsoINIncomplete(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
UNUSED(pdev);
UNUSED(epnum);
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_IsoOutIncomplete
* handle data ISO OUT Incomplete event
* @param pdev: device instance
* @param epnum: endpoint index
* @retval status
*/
static uint8_t USBD_AUDIO_IsoOutIncomplete(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
UNUSED(pdev);
UNUSED(epnum);
return (uint8_t)USBD_OK;
}
/**
* @brief USBD_AUDIO_DataOut
* handle data OUT Stage
* @param pdev: device instance
* @param epnum: endpoint index
* @retval status
*/
static uint8_t USBD_AUDIO_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum)
{
uint16_t PacketSize;
USBD_AUDIO_HandleTypeDef *haudio;
#ifdef USE_USBD_COMPOSITE
/* Get the Endpoints addresses allocated for this class instance */
AUDIOOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_ISOC, (uint8_t)pdev->classId);
#endif /* USE_USBD_COMPOSITE */
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
if (haudio == NULL)
{
return (uint8_t)USBD_FAIL;
}
if (epnum == AUDIOOutEpAdd)
{
/* Get received data packet length */
PacketSize = (uint16_t)USBD_LL_GetRxDataSize(pdev, epnum);
/* Packet received Callback */
((USBD_AUDIO_ItfTypeDef *)pdev->pUserData[pdev->classId])->PeriodicTC(&haudio->buffer[haudio->wr_ptr],
PacketSize, AUDIO_OUT_TC);
/* Increment the Buffer pointer or roll it back when all buffers are full */
haudio->wr_ptr += PacketSize;
if (haudio->wr_ptr >= AUDIO_TOTAL_BUF_SIZE)
{
/* All buffers are full: roll back */
haudio->wr_ptr = 0U;
if (haudio->offset == AUDIO_OFFSET_UNKNOWN)
{
((USBD_AUDIO_ItfTypeDef *)pdev->pUserData[pdev->classId])->AudioCmd(&haudio->buffer[0],
AUDIO_TOTAL_BUF_SIZE / 2U,
AUDIO_CMD_START);
haudio->offset = AUDIO_OFFSET_NONE;
}
}
if (haudio->rd_enable == 0U)
{
if (haudio->wr_ptr == (AUDIO_TOTAL_BUF_SIZE / 2U))
{
haudio->rd_enable = 1U;
}
}
/* Prepare Out endpoint to receive next audio packet */
(void)USBD_LL_PrepareReceive(pdev, AUDIOOutEpAdd,
&haudio->buffer[haudio->wr_ptr],
AUDIO_OUT_PACKET);
}
return (uint8_t)USBD_OK;
}
/**
* @brief AUDIO_Req_GetCurrent
* Handles the GET_CUR Audio control request.
* @param pdev: device instance
* @param req: setup class request
* @retval status
*/
static void AUDIO_REQ_GetCurrent(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
USBD_AUDIO_HandleTypeDef *haudio;
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
if (haudio == NULL)
{
return;
}
(void)USBD_memset(haudio->control.data, 0, USB_MAX_EP0_SIZE);
/* Send the current mute state */
(void)USBD_CtlSendData(pdev, haudio->control.data,
MIN(req->wLength, USB_MAX_EP0_SIZE));
}
/**
* @brief AUDIO_Req_SetCurrent
* Handles the SET_CUR Audio control request.
* @param pdev: device instance
* @param req: setup class request
* @retval status
*/
static void AUDIO_REQ_SetCurrent(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
USBD_AUDIO_HandleTypeDef *haudio;
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId];
if (haudio == NULL)
{
return;
}
if (req->wLength != 0U)
{
haudio->control.cmd = AUDIO_REQ_SET_CUR; /* Set the request value */
haudio->control.len = (uint8_t)MIN(req->wLength, USB_MAX_EP0_SIZE); /* Set the request data length */
haudio->control.unit = HIBYTE(req->wIndex); /* Set the request target unit */
/* Prepare the reception of the buffer over EP0 */
(void)USBD_CtlPrepareRx(pdev, haudio->control.data, haudio->control.len);
}
}
#ifndef USE_USBD_COMPOSITE
/**
* @brief DeviceQualifierDescriptor
* return Device Qualifier descriptor
* @param length : pointer data length
* @retval pointer to descriptor buffer
*/
static uint8_t *USBD_AUDIO_GetDeviceQualifierDesc(uint16_t *length)
{
*length = (uint16_t)sizeof(USBD_AUDIO_DeviceQualifierDesc);
return USBD_AUDIO_DeviceQualifierDesc;
}
#endif /* USE_USBD_COMPOSITE */
/**
* @brief USBD_AUDIO_RegisterInterface
* @param pdev: device instance
* @param fops: Audio interface callback
* @retval status
*/
uint8_t USBD_AUDIO_RegisterInterface(USBD_HandleTypeDef *pdev,
USBD_AUDIO_ItfTypeDef *fops)
{
if (fops == NULL)
{
return (uint8_t)USBD_FAIL;
}
pdev->pUserData[pdev->classId] = fops;
return (uint8_t)USBD_OK;
}
#ifdef USE_USBD_COMPOSITE
/**
* @brief USBD_AUDIO_GetEpPcktSze
* @param pdev: device instance (reserved for future use)
* @param If: Interface number (reserved for future use)
* @param Ep: Endpoint number (reserved for future use)
* @retval status
*/
uint32_t USBD_AUDIO_GetEpPcktSze(USBD_HandleTypeDef *pdev, uint8_t If, uint8_t Ep)
{
uint32_t mps;
UNUSED(pdev);
UNUSED(If);
UNUSED(Ep);
mps = AUDIO_PACKET_SZE_WORD(USBD_AUDIO_FREQ);
/* Return the wMaxPacketSize value in Bytes (Freq(Samples)*2(Stereo)*2(HalfWord)) */
return mps;
}
#endif /* USE_USBD_COMPOSITE */
/**
* @brief USBD_AUDIO_GetAudioHeaderDesc
* This function return the Audio descriptor
* @param pdev: device instance
* @param pConfDesc: pointer to Bos descriptor
* @retval pointer to the Audio AC Header descriptor
*/
static void *USBD_AUDIO_GetAudioHeaderDesc(uint8_t *pConfDesc)
{
USBD_ConfigDescTypeDef *desc = (USBD_ConfigDescTypeDef *)(void *)pConfDesc;
USBD_DescHeaderTypeDef *pdesc = (USBD_DescHeaderTypeDef *)(void *)pConfDesc;
uint8_t *pAudioDesc = NULL;
uint16_t ptr;
if (desc->wTotalLength > desc->bLength)
{
ptr = desc->bLength;
while (ptr < desc->wTotalLength)
{
pdesc = USBD_GetNextDesc((uint8_t *)pdesc, &ptr);
if ((pdesc->bDescriptorType == AUDIO_INTERFACE_DESCRIPTOR_TYPE) &&
(pdesc->bDescriptorSubType == AUDIO_CONTROL_HEADER))
{
pAudioDesc = (uint8_t *)pdesc;
break;
}
}
}
return pAudioDesc;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
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