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/**
******************************************************************************
* @file Audio_playback_and_record/Src/waveplayer.c
* @author MCD Application Team
* @brief I2S Audio player program.
******************************************************************************
* @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 "main.h"
/** @addtogroup STM32F4-Discovery_Audio_Player_Recorder
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define AUDIO_BUFFER_SIZE 4096
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* LED State (Toggle or OFF)*/
__IO uint32_t LEDsState;
extern __IO uint32_t RepeatState, PauseResumeStatus, PressCount;
/* Audio Play Start variable.
Defined as external in main.c*/
__IO uint32_t AudioPlayStart = 0;
/* Audio wave data length to be played */
static uint32_t WaveDataLength = 0;
/* Audio wave remaining data length to be played */
static __IO uint32_t AudioRemSize = 0;
/* Ping-Pong buffer used for audio play */
uint8_t Audio_Buffer[AUDIO_BUFFER_SIZE];
/* Position in the audio play buffer */
__IO BUFFER_StateTypeDef BufferOffset = BUFFER_OFFSET_NONE;
/* Initial Volume level (from 0 (Mute) to 100 (Max)) */
static uint8_t Volume = 70;
/* Variable used to indicate audio mode (play, record or stop). */
/* Defined in main.c */
extern __IO uint32_t CmdIndex;
/* Variable used by FatFs*/
FIL FileRead;
DIR Directory;
/* Variable used to switch play from audio sample available on USB to recorded file. */
/* Defined in waverecorder.c */
extern uint32_t WaveRecStatus;
/* Variable to indicate USB state (start/idle) */
/* Defined in main.c */
extern MSC_ApplicationTypeDef AppliState;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
* @brief Plays Wave from a mass storage.
* @param AudioFreq: Audio Sampling Frequency
* @retval None
*/
void WavePlayBack(uint32_t AudioFreq)
{
UINT bytesread = 0;
/* Start playing */
AudioPlayStart = 1;
RepeatState = REPEAT_ON;
/* Initialize Wave player (Codec, DMA, I2C) */
if(WavePlayerInit(AudioFreq) != 0)
{
Error_Handler();
}
/* Get Data from USB Flash Disk */
f_lseek(&FileRead, 0);
f_read (&FileRead, &Audio_Buffer[0], AUDIO_BUFFER_SIZE, &bytesread);
AudioRemSize = WaveDataLength - bytesread;
/* Start playing Wave */
BSP_AUDIO_OUT_Play((uint16_t*)&Audio_Buffer[0], AUDIO_BUFFER_SIZE);
LEDsState = LED6_TOGGLE;
PauseResumeStatus = RESUME_STATUS;
PressCount = 0;
/* Check if the device is connected.*/
while((AudioRemSize != 0) && (AppliState != APPLICATION_IDLE))
{
/* Test on the command: Playing */
if(CmdIndex == CMD_PLAY)
{
if(PauseResumeStatus == PAUSE_STATUS)
{
/* Stop Toggling LED2 to signal Pause */
LEDsState = STOP_TOGGLE;
/* Pause playing Wave */
WavePlayerPauseResume(PauseResumeStatus);
PauseResumeStatus = IDLE_STATUS;
}
else if(PauseResumeStatus == RESUME_STATUS)
{
/* Toggling LED6 to signal Play */
LEDsState = LED6_TOGGLE;
/* Resume playing Wave */
WavePlayerPauseResume(PauseResumeStatus);
PauseResumeStatus = IDLE_STATUS;
}
bytesread = 0;
if(BufferOffset == BUFFER_OFFSET_HALF)
{
f_read(&FileRead,
&Audio_Buffer[0],
AUDIO_BUFFER_SIZE/2,
(void *)&bytesread);
BufferOffset = BUFFER_OFFSET_NONE;
}
if(BufferOffset == BUFFER_OFFSET_FULL)
{
f_read(&FileRead,
&Audio_Buffer[AUDIO_BUFFER_SIZE/2],
AUDIO_BUFFER_SIZE/2,
(void *)&bytesread);
BufferOffset = BUFFER_OFFSET_NONE;
}
if(AudioRemSize > (AUDIO_BUFFER_SIZE / 2))
{
AudioRemSize -= bytesread;
}
else
{
AudioRemSize = 0;
}
}
else
{
/* Stop playing Wave */
WavePlayerStop();
f_close(&FileRead);
AudioRemSize = 0;
RepeatState = REPEAT_ON;
break;
}
}
#ifdef PLAY_REPEAT_DISABLED
RepeatState = REPEAT_OFF;
/* Stop playing Wave */
WavePlayerStop();
f_close(&FileRead);
/* Test on the command: Playing */
if(CmdIndex == CMD_PLAY)
{
LEDsState = LED4_TOGGLE;
}
#else
LEDsState = LEDS_OFF;
RepeatState = REPEAT_ON;
AudioPlayStart = 0;
/* Stop playing Wave */
WavePlayerStop();
f_close(&FileRead);
#endif /* PLAY_REPEAT_DISABLED */
}
/**
* @brief Pauses or Resumes a played Wave.
* @param state: Player state: Pause, Resume or Idle
* @retval None
*/
void WavePlayerPauseResume(uint32_t wState)
{
if(wState == PAUSE_STATUS)
{
BSP_AUDIO_OUT_Pause();
}
else
{
BSP_AUDIO_OUT_Resume();
}
}
/**
* @brief Stops playing Wave.
* @param None
* @retval None
*/
void WavePlayerStop(void)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_HW);
}
/**
* @brief Initializes the Wave player.
* @param AudioFreq: Audio sampling frequency
* @retval None
*/
int WavePlayerInit(uint32_t AudioFreq)
{
/* MEMS Accelerometer configure to manage PAUSE, RESUME operations */
BSP_ACCELERO_Click_ITConfig();
/* Initialize the Audio codec and all related peripherals (I2S, I2C, IOExpander, IOs...) */
return(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_AUTO, Volume, AudioFreq));
}
/*--------------------------------
Callbacks implementation:
The callbacks prototypes are defined in the stm32f4_discovery_audio_codec.h file
and their implementation should be done in the user code if they are needed.
Below some examples of callback implementations.
--------------------------------------------------------*/
/**
* @brief Manages the DMA Half Transfer complete interrupt.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_HalfTransfer_CallBack(void)
{
BufferOffset = BUFFER_OFFSET_HALF;
}
/**
* @brief Calculates the remaining file size and new position of the pointer.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
BufferOffset = BUFFER_OFFSET_FULL;
BSP_AUDIO_OUT_ChangeBuffer((uint16_t*)&Audio_Buffer[0], AUDIO_BUFFER_SIZE /2);
}
/**
* @brief Manages the DMA FIFO error interrupt.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_Error_CallBack(void)
{
/* Stop the program with an infinite loop */
while (1)
{}
/* Could also generate a system reset to recover from the error */
/* .... */
}
/**
* @brief Starts Wave player.
* @param None
* @retval None
*/
void WavePlayerStart(void)
{
UINT bytesread = 0;
char path[] = "0:/";
char* wavefilename = NULL;
WAVE_FormatTypeDef waveformat;
/* Get the read out protection status */
if(f_opendir(&Directory, path) == FR_OK)
{
if(WaveRecStatus == 1)
{
wavefilename = REC_WAVE_NAME;
}
else
{
wavefilename = WAVE_NAME;
}
/* Open the Wave file to be played */
if(f_open(&FileRead, wavefilename , FA_READ) != FR_OK)
{
BSP_LED_On(LED5);
CmdIndex = CMD_RECORD;
}
else
{
/* Read sizeof(WaveFormat) from the selected file */
f_read (&FileRead, &waveformat, sizeof(waveformat), &bytesread);
/* Set WaveDataLenght to the Speech Wave length */
WaveDataLength = waveformat.FileSize;
/* Play the Wave */
WavePlayBack(waveformat.SampleRate);
}
}
}
/**
* @brief Resets the Wave player.
* @param None
* @retval None
*/
void WavePlayer_CallBack(void)
{
if(AppliState != APPLICATION_IDLE)
{
/* Reset the Wave player variables */
RepeatState = REPEAT_ON;
AudioPlayStart = 0;
LEDsState = LEDS_OFF;
PauseResumeStatus = RESUME_STATUS;
WaveDataLength =0;
PressCount = 0;
/* Stop the Codec */
if(BSP_AUDIO_OUT_Stop(CODEC_PDWN_HW) != AUDIO_OK)
{
while(1){};
}
/* Turn OFF LED3, LED4 and LED6 */
BSP_LED_Off(LED3);
BSP_LED_Off(LED4);
BSP_LED_Off(LED6);
}
}
/**
* @}
*/