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/**
******************************************************************************
* @file USB_Device/AUDIO_Standalone/Src/usbd_audio_if.c
* @author MCD Application Team
* @brief USB Device Audio interface file.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "usbd_audio_if.h"
#include "stm32446e_eval_audio.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static int8_t Audio_Init(uint32_t AudioFreq, uint32_t Volume, uint32_t options);
static int8_t Audio_DeInit(uint32_t options);
static int8_t Audio_PlaybackCmd(uint8_t* pbuf, uint32_t size, uint8_t cmd);
static int8_t Audio_VolumeCtl(uint8_t vol);
static int8_t Audio_MuteCtl(uint8_t cmd);
static int8_t Audio_PeriodicTC(uint8_t *pbuf, uint32_t size, uint8_t cmd);
static int8_t Audio_GetState(void);
/* Private variables ---------------------------------------------------------*/
extern USBD_HandleTypeDef USBD_Device;
USBD_AUDIO_ItfTypeDef USBD_AUDIO_fops = {
Audio_Init,
Audio_DeInit,
Audio_PlaybackCmd,
Audio_VolumeCtl,
Audio_MuteCtl,
Audio_PeriodicTC,
Audio_GetState,
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief Initializes the AUDIO media low layer.
* @param AudioFreq: Audio frequency used to play the audio stream.
* @param Volume: Initial volume level (from 0 (Mute) to 100 (Max))
* @param options: Reserved for future use
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_Init(uint32_t AudioFreq, uint32_t Volume, uint32_t options)
{
BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_AUTO, Volume, AudioFreq);
/* Update the Audio frame slot configuration to match the PCM standard instead of TDM */
BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02);
return 0;
}
/**
* @brief De-Initializes the AUDIO media low layer.
* @param options: Reserved for future use
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_DeInit(uint32_t options)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
return 0;
}
/**
* @brief Handles AUDIO command.
* @param pbuf: Pointer to buffer of data to be sent
* @param size: Number of data to be sent (in bytes)
* @param cmd: Command opcode
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_PlaybackCmd(uint8_t *pbuf, uint32_t size, uint8_t cmd)
{
switch(cmd)
{
case AUDIO_CMD_START:
BSP_AUDIO_OUT_Play((uint16_t *)pbuf, 2*size);
break;
case AUDIO_CMD_PLAY:
BSP_AUDIO_OUT_ChangeBuffer((uint16_t *)pbuf, 2*size);
break;
}
return 0;
}
/**
* @brief Controls AUDIO Volume.
* @param vol: Volume level (0..100)
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_VolumeCtl(uint8_t vol)
{
BSP_AUDIO_OUT_SetVolume(vol);
return 0;
}
/**
* @brief Controls AUDIO Mute.
* @param cmd: Command opcode
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_MuteCtl(uint8_t cmd)
{
BSP_AUDIO_OUT_SetMute(cmd);
return 0;
}
/**
* @brief Audio_PeriodicTC
* @param cmd: Command opcode
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_PeriodicTC(uint8_t *pbuf, uint32_t size, uint8_t cmd)
{
return 0;
}
/**
* @brief Gets AUDIO State.
* @param None
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
*/
static int8_t Audio_GetState(void)
{
return 0;
}
/**
* @brief Manages the DMA full Transfer complete event.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
USBD_AUDIO_Sync(&USBD_Device, AUDIO_OFFSET_FULL);
}
/**
* @brief Manages the DMA Half Transfer complete event.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_HalfTransfer_CallBack(void)
{
USBD_AUDIO_Sync(&USBD_Device, AUDIO_OFFSET_HALF);
}