usbd_audio.c File Reference

This file provides the Audio core functions. More...

#include "usbd_audio.h"
#include "usbd_desc.h"
#include "usbd_ctlreq.h"
#include "AudioPlayer.h"

Go to the source code of this file.

Macros
#define	AUDIO_SAMPLE_FREQ(frq)    (uint8_t)(frq), (uint8_t)((frq >> 8)), (uint8_t)((frq >> 16))
#define	AUDIO_PACKET_SZE(frq)

Functions
void	USBD_AUDIO_Sync (USBD_HandleTypeDef *pdev, AUDIO_OffsetTypeDef offset)
	USBD_AUDIO_SOF handle SOF event. More...
uint8_t	USBD_AUDIO_RegisterInterface (USBD_HandleTypeDef *pdev, USBD_AUDIO_ItfTypeDef *fops)
	USBD_AUDIO_RegisterInterface. More...

Variables
uint32_t	EP1PktLen
USBD_ClassTypeDef	USBD_AUDIO

Detailed Description

This file provides the Audio core functions.

Author

MCD Application Team

Version

V2.4.2

Date

11-December-2015

 *      
 *          ===================================================================      
 *                                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.
 *           
 *      
 *  

Attention

© COPYRIGHT 2015 STMicroelectronics

Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); You may not use this file except in compliance with the License. You may obtain a copy of the License at:

   http://www.st.com/software_license_agreement_liberty_v2

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Definition in file usbd_audio.c.