AUDIO_Standalone
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Outline
Includes
#include "usbd_audio_if.h"
#include "stm324xg_eval_audio.h"
Private function prototypes
Private variables
USBD_AUDIO_fops
Audio_Init(uint32_t, uint32_t, uint32_t)
Audio_DeInit(uint32_t)
Audio_PlaybackCmd(uint8_t *, uint32_t, uint8_t)
Audio_VolumeCtl(uint8_t)
Audio_MuteCtl(uint8_t)
Audio_PeriodicTC(uint8_t *, uint32_t, uint8_t)
Audio_GetState()
BSP_AUDIO_OUT_TransferComplete_CallBack()
BSP_AUDIO_OUT_HalfTransfer_CallBack()
Files
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SourceVuSTM32 Libraries and SamplesAUDIO_StandaloneSrc/usbd_audio_if.c
 
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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 "stm324xg_eval_audio.h" Includes /* 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 function prototypes /* 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 variables /* 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); 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, size); break; case AUDIO_CMD_START: case AUDIO_CMD_PLAY: BSP_AUDIO_OUT_ChangeBuffer((uint16_t *)pbuf, size); break;case AUDIO_CMD_PLAY: }switch (cmd) { ... } 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); }{ ... }
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