mirror of
https://github.com/STMicroelectronics/stm32-mw-usb-device.git
synced 2026-02-08 12:08:06 -05:00
875 lines
26 KiB
C
875 lines
26 KiB
C
/**
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******************************************************************************
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* @file usbd_audio.c
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* @author MCD Application Team
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* @brief This file provides the Audio core functions.
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*
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2015 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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* @verbatim
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*
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* ===================================================================
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* AUDIO Class Description
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* ===================================================================
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* This driver manages the Audio Class 1.0 following the "USB Device Class Definition for
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* Audio Devices V1.0 Mar 18, 98".
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* This driver implements the following aspects of the specification:
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* - Device descriptor management
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* - Configuration descriptor management
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* - Standard AC Interface Descriptor management
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* - 1 Audio Streaming Interface (with single channel, PCM, Stereo mode)
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* - 1 Audio Streaming Endpoint
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* - 1 Audio Terminal Input (1 channel)
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* - Audio Class-Specific AC Interfaces
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* - Audio Class-Specific AS Interfaces
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* - AudioControl Requests: only SET_CUR and GET_CUR requests are supported (for Mute)
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* - Audio Feature Unit (limited to Mute control)
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* - Audio Synchronization type: Asynchronous
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* - Single fixed audio sampling rate (configurable in usbd_conf.h file)
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* The current audio class version supports the following audio features:
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* - Pulse Coded Modulation (PCM) format
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* - sampling rate: 48KHz.
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* - Bit resolution: 16
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* - Number of channels: 2
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* - No volume control
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* - Mute/Unmute capability
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* - Asynchronous Endpoints
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*
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* @note In HS mode and when the DMA is used, all variables and data structures
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* dealing with the DMA during the transaction process should be 32-bit aligned.
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*
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*
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* @endverbatim
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******************************************************************************
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*/
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/* BSPDependencies
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- "stm32xxxxx_{eval}{discovery}.c"
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- "stm32xxxxx_{eval}{discovery}_io.c"
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- "stm32xxxxx_{eval}{discovery}_audio.c"
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EndBSPDependencies */
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/* Includes ------------------------------------------------------------------*/
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#include "usbd_audio.h"
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#include "usbd_ctlreq.h"
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/** @addtogroup STM32_USB_DEVICE_LIBRARY
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* @{
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*/
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/** @defgroup USBD_AUDIO
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* @brief usbd core module
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* @{
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*/
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/** @defgroup USBD_AUDIO_Private_TypesDefinitions
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* @{
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*/
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/**
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* @}
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*/
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/** @defgroup USBD_AUDIO_Private_Defines
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* @{
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*/
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/**
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* @}
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*/
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/** @defgroup USBD_AUDIO_Private_Macros
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* @{
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*/
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#define AUDIO_SAMPLE_FREQ(frq) \
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(uint8_t)(frq), (uint8_t)((frq >> 8)), (uint8_t)((frq >> 16))
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#define AUDIO_PACKET_SZE(frq) \
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(uint8_t)(((frq * 2U * 2U) / 1000U) & 0xFFU), (uint8_t)((((frq * 2U * 2U) / 1000U) >> 8) & 0xFFU)
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/**
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* @}
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*/
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/** @defgroup USBD_AUDIO_Private_FunctionPrototypes
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* @{
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*/
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static uint8_t USBD_AUDIO_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx);
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static uint8_t USBD_AUDIO_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx);
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static uint8_t USBD_AUDIO_Setup(USBD_HandleTypeDef *pdev,
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USBD_SetupReqTypedef *req);
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static uint8_t *USBD_AUDIO_GetCfgDesc(uint16_t *length);
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static uint8_t *USBD_AUDIO_GetDeviceQualifierDesc(uint16_t *length);
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static uint8_t USBD_AUDIO_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum);
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static uint8_t USBD_AUDIO_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum);
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static uint8_t USBD_AUDIO_EP0_RxReady(USBD_HandleTypeDef *pdev);
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static uint8_t USBD_AUDIO_EP0_TxReady(USBD_HandleTypeDef *pdev);
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static uint8_t USBD_AUDIO_SOF(USBD_HandleTypeDef *pdev);
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static uint8_t USBD_AUDIO_IsoINIncomplete(USBD_HandleTypeDef *pdev, uint8_t epnum);
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static uint8_t USBD_AUDIO_IsoOutIncomplete(USBD_HandleTypeDef *pdev, uint8_t epnum);
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static void AUDIO_REQ_GetCurrent(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
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static void AUDIO_REQ_SetCurrent(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
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/**
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* @}
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*/
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/** @defgroup USBD_AUDIO_Private_Variables
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* @{
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*/
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USBD_ClassTypeDef USBD_AUDIO =
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{
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USBD_AUDIO_Init,
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USBD_AUDIO_DeInit,
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USBD_AUDIO_Setup,
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USBD_AUDIO_EP0_TxReady,
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USBD_AUDIO_EP0_RxReady,
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USBD_AUDIO_DataIn,
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USBD_AUDIO_DataOut,
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USBD_AUDIO_SOF,
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USBD_AUDIO_IsoINIncomplete,
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USBD_AUDIO_IsoOutIncomplete,
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USBD_AUDIO_GetCfgDesc,
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USBD_AUDIO_GetCfgDesc,
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USBD_AUDIO_GetCfgDesc,
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USBD_AUDIO_GetDeviceQualifierDesc,
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};
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/* USB AUDIO device Configuration Descriptor */
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__ALIGN_BEGIN static uint8_t USBD_AUDIO_CfgDesc[USB_AUDIO_CONFIG_DESC_SIZ] __ALIGN_END =
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{
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/* Configuration 1 */
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0x09, /* bLength */
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USB_DESC_TYPE_CONFIGURATION, /* bDescriptorType */
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LOBYTE(USB_AUDIO_CONFIG_DESC_SIZ), /* wTotalLength */
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HIBYTE(USB_AUDIO_CONFIG_DESC_SIZ),
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0x02, /* bNumInterfaces */
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0x01, /* bConfigurationValue */
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0x00, /* iConfiguration */
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#if (USBD_SELF_POWERED == 1U)
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0xC0, /* bmAttributes: Bus Powered according to user configuration */
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#else
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0x80, /* bmAttributes: Bus Powered according to user configuration */
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#endif
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USBD_MAX_POWER, /* MaxPower (mA) */
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/* 09 byte*/
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/* USB Speaker Standard interface descriptor */
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AUDIO_INTERFACE_DESC_SIZE, /* bLength */
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USB_DESC_TYPE_INTERFACE, /* bDescriptorType */
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0x00, /* bInterfaceNumber */
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0x00, /* bAlternateSetting */
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0x00, /* bNumEndpoints */
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USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */
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AUDIO_SUBCLASS_AUDIOCONTROL, /* bInterfaceSubClass */
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AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */
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0x00, /* iInterface */
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/* 09 byte*/
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/* USB Speaker Class-specific AC Interface Descriptor */
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AUDIO_INTERFACE_DESC_SIZE, /* bLength */
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AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_CONTROL_HEADER, /* bDescriptorSubtype */
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0x00, /* 1.00 */ /* bcdADC */
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0x01,
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0x27, /* wTotalLength */
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0x00,
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0x01, /* bInCollection */
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0x01, /* baInterfaceNr */
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/* 09 byte*/
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/* USB Speaker Input Terminal Descriptor */
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AUDIO_INPUT_TERMINAL_DESC_SIZE, /* bLength */
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AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_CONTROL_INPUT_TERMINAL, /* bDescriptorSubtype */
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0x01, /* bTerminalID */
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0x01, /* wTerminalType AUDIO_TERMINAL_USB_STREAMING 0x0101 */
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0x01,
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0x00, /* bAssocTerminal */
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0x01, /* bNrChannels */
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0x00, /* wChannelConfig 0x0000 Mono */
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0x00,
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0x00, /* iChannelNames */
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0x00, /* iTerminal */
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/* 12 byte*/
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/* USB Speaker Audio Feature Unit Descriptor */
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0x09, /* bLength */
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AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_CONTROL_FEATURE_UNIT, /* bDescriptorSubtype */
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AUDIO_OUT_STREAMING_CTRL, /* bUnitID */
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0x01, /* bSourceID */
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0x01, /* bControlSize */
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AUDIO_CONTROL_MUTE, /* bmaControls(0) */
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0, /* bmaControls(1) */
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0x00, /* iTerminal */
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/* 09 byte */
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/* USB Speaker Output Terminal Descriptor */
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0x09, /* bLength */
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AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_CONTROL_OUTPUT_TERMINAL, /* bDescriptorSubtype */
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0x03, /* bTerminalID */
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0x01, /* wTerminalType 0x0301 */
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0x03,
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0x00, /* bAssocTerminal */
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0x02, /* bSourceID */
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0x00, /* iTerminal */
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/* 09 byte */
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/* USB Speaker Standard AS Interface Descriptor - Audio Streaming Zero Bandwidth */
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/* Interface 1, Alternate Setting 0 */
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AUDIO_INTERFACE_DESC_SIZE, /* bLength */
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USB_DESC_TYPE_INTERFACE, /* bDescriptorType */
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0x01, /* bInterfaceNumber */
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0x00, /* bAlternateSetting */
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0x00, /* bNumEndpoints */
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USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */
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AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */
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AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */
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0x00, /* iInterface */
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/* 09 byte*/
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/* USB Speaker Standard AS Interface Descriptor - Audio Streaming Operational */
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/* Interface 1, Alternate Setting 1 */
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AUDIO_INTERFACE_DESC_SIZE, /* bLength */
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USB_DESC_TYPE_INTERFACE, /* bDescriptorType */
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0x01, /* bInterfaceNumber */
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0x01, /* bAlternateSetting */
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0x01, /* bNumEndpoints */
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USB_DEVICE_CLASS_AUDIO, /* bInterfaceClass */
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AUDIO_SUBCLASS_AUDIOSTREAMING, /* bInterfaceSubClass */
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AUDIO_PROTOCOL_UNDEFINED, /* bInterfaceProtocol */
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0x00, /* iInterface */
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/* 09 byte*/
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/* USB Speaker Audio Streaming Interface Descriptor */
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AUDIO_STREAMING_INTERFACE_DESC_SIZE, /* bLength */
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AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_STREAMING_GENERAL, /* bDescriptorSubtype */
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0x01, /* bTerminalLink */
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0x01, /* bDelay */
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0x01, /* wFormatTag AUDIO_FORMAT_PCM 0x0001 */
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0x00,
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/* 07 byte*/
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/* USB Speaker Audio Type III Format Interface Descriptor */
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0x0B, /* bLength */
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AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */
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AUDIO_FORMAT_TYPE_I, /* bFormatType */
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0x02, /* bNrChannels */
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0x02, /* bSubFrameSize : 2 Bytes per frame (16bits) */
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16, /* bBitResolution (16-bits per sample) */
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0x01, /* bSamFreqType only one frequency supported */
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AUDIO_SAMPLE_FREQ(USBD_AUDIO_FREQ), /* Audio sampling frequency coded on 3 bytes */
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/* 11 byte*/
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/* Endpoint 1 - Standard Descriptor */
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AUDIO_STANDARD_ENDPOINT_DESC_SIZE, /* bLength */
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USB_DESC_TYPE_ENDPOINT, /* bDescriptorType */
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AUDIO_OUT_EP, /* bEndpointAddress 1 out endpoint */
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USBD_EP_TYPE_ISOC, /* bmAttributes */
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AUDIO_PACKET_SZE(USBD_AUDIO_FREQ), /* wMaxPacketSize in Bytes (Freq(Samples)*2(Stereo)*2(HalfWord)) */
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AUDIO_FS_BINTERVAL, /* bInterval */
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0x00, /* bRefresh */
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0x00, /* bSynchAddress */
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/* 09 byte*/
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/* Endpoint - Audio Streaming Descriptor */
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AUDIO_STREAMING_ENDPOINT_DESC_SIZE, /* bLength */
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AUDIO_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */
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AUDIO_ENDPOINT_GENERAL, /* bDescriptor */
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0x00, /* bmAttributes */
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0x00, /* bLockDelayUnits */
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0x00, /* wLockDelay */
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0x00,
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/* 07 byte*/
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} ;
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/* USB Standard Device Descriptor */
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__ALIGN_BEGIN static uint8_t USBD_AUDIO_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_DESC] __ALIGN_END =
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{
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USB_LEN_DEV_QUALIFIER_DESC,
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USB_DESC_TYPE_DEVICE_QUALIFIER,
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0x00,
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0x02,
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0x00,
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0x00,
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0x00,
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0x40,
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0x01,
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0x00,
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};
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/**
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* @}
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*/
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/** @defgroup USBD_AUDIO_Private_Functions
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* @{
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*/
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/**
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* @brief USBD_AUDIO_Init
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* Initialize the AUDIO interface
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* @param pdev: device instance
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* @param cfgidx: Configuration index
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* @retval status
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*/
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static uint8_t USBD_AUDIO_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
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{
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UNUSED(cfgidx);
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USBD_AUDIO_HandleTypeDef *haudio;
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/* Allocate Audio structure */
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haudio = (USBD_AUDIO_HandleTypeDef *)USBD_malloc(sizeof(USBD_AUDIO_HandleTypeDef));
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if (haudio == NULL)
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{
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pdev->pClassData = NULL;
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return (uint8_t)USBD_EMEM;
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}
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pdev->pClassData = (void *)haudio;
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if (pdev->dev_speed == USBD_SPEED_HIGH)
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{
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pdev->ep_out[AUDIO_OUT_EP & 0xFU].bInterval = AUDIO_HS_BINTERVAL;
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}
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else /* LOW and FULL-speed endpoints */
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{
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pdev->ep_out[AUDIO_OUT_EP & 0xFU].bInterval = AUDIO_FS_BINTERVAL;
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}
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/* Open EP OUT */
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(void)USBD_LL_OpenEP(pdev, AUDIO_OUT_EP, USBD_EP_TYPE_ISOC, AUDIO_OUT_PACKET);
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pdev->ep_out[AUDIO_OUT_EP & 0xFU].is_used = 1U;
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haudio->alt_setting = 0U;
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haudio->offset = AUDIO_OFFSET_UNKNOWN;
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haudio->wr_ptr = 0U;
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haudio->rd_ptr = 0U;
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haudio->rd_enable = 0U;
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/* Initialize the Audio output Hardware layer */
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if (((USBD_AUDIO_ItfTypeDef *)pdev->pUserData)->Init(USBD_AUDIO_FREQ,
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AUDIO_DEFAULT_VOLUME,
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0U) != 0U)
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{
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return (uint8_t)USBD_FAIL;
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}
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/* Prepare Out endpoint to receive 1st packet */
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(void)USBD_LL_PrepareReceive(pdev, AUDIO_OUT_EP, haudio->buffer,
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AUDIO_OUT_PACKET);
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return (uint8_t)USBD_OK;
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}
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/**
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* @brief USBD_AUDIO_Init
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* DeInitialize the AUDIO layer
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* @param pdev: device instance
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* @param cfgidx: Configuration index
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* @retval status
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*/
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static uint8_t USBD_AUDIO_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
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{
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UNUSED(cfgidx);
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/* Open EP OUT */
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(void)USBD_LL_CloseEP(pdev, AUDIO_OUT_EP);
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pdev->ep_out[AUDIO_OUT_EP & 0xFU].is_used = 0U;
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pdev->ep_out[AUDIO_OUT_EP & 0xFU].bInterval = 0U;
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/* DeInit physical Interface components */
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if (pdev->pClassData != NULL)
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{
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((USBD_AUDIO_ItfTypeDef *)pdev->pUserData)->DeInit(0U);
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(void)USBD_free(pdev->pClassData);
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pdev->pClassData = NULL;
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}
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return (uint8_t)USBD_OK;
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}
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/**
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* @brief USBD_AUDIO_Setup
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* Handle the AUDIO specific requests
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* @param pdev: instance
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* @param req: usb requests
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* @retval status
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*/
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static uint8_t USBD_AUDIO_Setup(USBD_HandleTypeDef *pdev,
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USBD_SetupReqTypedef *req)
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{
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USBD_AUDIO_HandleTypeDef *haudio;
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uint16_t len;
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uint8_t *pbuf;
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uint16_t status_info = 0U;
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USBD_StatusTypeDef ret = USBD_OK;
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haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassData;
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if (haudio == NULL)
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{
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return (uint8_t)USBD_FAIL;
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}
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switch (req->bmRequest & USB_REQ_TYPE_MASK)
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{
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case USB_REQ_TYPE_CLASS:
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switch (req->bRequest)
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{
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case AUDIO_REQ_GET_CUR:
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AUDIO_REQ_GetCurrent(pdev, req);
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break;
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case AUDIO_REQ_SET_CUR:
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AUDIO_REQ_SetCurrent(pdev, req);
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break;
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default:
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USBD_CtlError(pdev, req);
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ret = USBD_FAIL;
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break;
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}
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break;
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case USB_REQ_TYPE_STANDARD:
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switch (req->bRequest)
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{
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case USB_REQ_GET_STATUS:
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if (pdev->dev_state == USBD_STATE_CONFIGURED)
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{
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(void)USBD_CtlSendData(pdev, (uint8_t *)&status_info, 2U);
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}
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else
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{
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USBD_CtlError(pdev, req);
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ret = USBD_FAIL;
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}
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break;
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case USB_REQ_GET_DESCRIPTOR:
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if ((req->wValue >> 8) == AUDIO_DESCRIPTOR_TYPE)
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{
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pbuf = USBD_AUDIO_CfgDesc + 18;
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len = MIN(USB_AUDIO_DESC_SIZ, req->wLength);
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(void)USBD_CtlSendData(pdev, pbuf, len);
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}
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break;
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case USB_REQ_GET_INTERFACE:
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if (pdev->dev_state == USBD_STATE_CONFIGURED)
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{
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(void)USBD_CtlSendData(pdev, (uint8_t *)&haudio->alt_setting, 1U);
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}
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else
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{
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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;
|
|
}
|
|
|
|
|
|
/**
|
|
* @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;
|
|
}
|
|
|
|
/**
|
|
* @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->pClassData;
|
|
|
|
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)->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->pClassData == NULL)
|
|
{
|
|
return;
|
|
}
|
|
|
|
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassData;
|
|
|
|
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)->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;
|
|
|
|
haudio = (USBD_AUDIO_HandleTypeDef *)pdev->pClassData;
|
|
|
|
if (haudio == NULL)
|
|
{
|
|
return (uint8_t)USBD_FAIL;
|
|
}
|
|
|
|
if (epnum == AUDIO_OUT_EP)
|
|
{
|
|
/* Get received data packet length */
|
|
PacketSize = (uint16_t)USBD_LL_GetRxDataSize(pdev, epnum);
|
|
|
|
/* Packet received Callback */
|
|
((USBD_AUDIO_ItfTypeDef *)pdev->pUserData)->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)->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, AUDIO_OUT_EP,
|
|
&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->pClassData;
|
|
|
|
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->pClassData;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* @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;
|
|
}
|
|
|
|
/**
|
|
* @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 = fops;
|
|
|
|
return (uint8_t)USBD_OK;
|
|
}
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
|
|
/**
|
|
* @}
|
|
*/
|