/**
* @brief Pause Audio stream
* @param None.
* @retval Audio state.
*/
AUDIO_RECORDER_ErrorTypdef AUDIO_RECORDER_PauseResume(void)
{
if(haudio.in.state == AUDIO_RECORDER_PLAYING)
{
osThreadSuspend(AudioThreadId);
BSP_AUDIO_OUT_Pause();
haudio.in.state = AUDIO_RECORDER_PLAY_PAUSE;
}
else if(haudio.in.state == AUDIO_RECORDER_RECORDING)
{
osThreadSuspend(AudioThreadId);
BSP_AUDIO_IN_Pause();
haudio.in.state = AUDIO_RECORDER_RECORD_PAUSE;
}
else if(haudio.in.state == AUDIO_RECORDER_PLAY_PAUSE)
{
osThreadResume(AudioThreadId);
BSP_AUDIO_OUT_Resume();
haudio.in.state = AUDIO_RECORDER_PLAYING;
}
else if(haudio.in.state == AUDIO_RECORDER_RECORD_PAUSE)
{
osThreadResume(AudioThreadId);
BSP_AUDIO_IN_Resume();
haudio.in.state = AUDIO_RECORDER_RECORDING;
}
return AUDIO_RECORDER_ERROR_NONE;
}
/**
* @brief Pause Audio stream
* @param None.
* @retval Audio state.
*/
AUDIOPLAYER_ErrorTypdef AUDIOPLAYER_Pause(void)
{
if(AudioThreadId != 0)
{
osThreadSuspend(AudioThreadId);
}
BSP_AUDIO_OUT_Pause();
return AUDIOPLAYER_ERROR_NONE;
}
/**
* @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 Sets audio stream position
* @param position: stream position.
* @retval Audio state.
*/
AUDIOPLAYER_ErrorTypdef AUDIOPLAYER_SetPosition(uint32_t position)
{
long file_pos;
file_pos = wav_file.fsize / AUDIO_BUFFER_SIZE / 100;
file_pos *= (position * AUDIO_BUFFER_SIZE);
BSP_AUDIO_OUT_Pause();
f_lseek(&wav_file, file_pos);
BSP_AUDIO_OUT_Resume();
return AUDIOPLAYER_ERROR_NONE;
}
/**
* @brief Play audio stream
* @param frequency: Audio frequency used to play the audio stream.
* @retval Audio state.
*/
AUDIOPLAYER_ErrorTypdef AUDIOPLAYER_Play(uint32_t frequency)
{
uint32_t numOfReadBytes;
haudio.out.state = AUDIOPLAYER_PLAY;
/* Fill whole buffer @ first time */
if(f_read(&wav_file,
&haudio.buff[0],
AUDIO_OUT_BUFFER_SIZE,
(void *)&numOfReadBytes) == FR_OK)
{
if(numOfReadBytes != 0)
{
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(frequency);
osThreadResume(AudioThreadId);
BSP_AUDIO_OUT_Play((uint16_t*)&haudio.buff[0], AUDIO_OUT_BUFFER_SIZE);
return AUDIOPLAYER_ERROR_NONE;
}
}
return AUDIOPLAYER_ERROR_IO;
}
/**
* @brief Manages Audio process.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_PLAYER_Process(void)
{
uint32_t bytesread, elapsed_time;
AUDIO_ErrorTypeDef audio_error = AUDIO_ERROR_NONE;
static uint32_t prev_elapsed_time = 0xFFFFFFFF;
uint8_t str[10];
switch(AudioState)
{
case AUDIO_STATE_PLAY:
if(BufferCtl.fptr >= WaveFormat.FileSize)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AudioState = AUDIO_STATE_NEXT;
}
if(BufferCtl.state == BUFFER_OFFSET_HALF)
{
if(f_read(&WavFile,
&BufferCtl.buff[0],
AUDIO_OUT_BUFFER_SIZE/2,
(void *)&bytesread) != FR_OK)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
return AUDIO_ERROR_IO;
}
BufferCtl.state = BUFFER_OFFSET_NONE;
BufferCtl.fptr += bytesread;
}
if(BufferCtl.state == BUFFER_OFFSET_FULL)
{
if(f_read(&WavFile,
&BufferCtl.buff[AUDIO_OUT_BUFFER_SIZE /2],
AUDIO_OUT_BUFFER_SIZE/2,
(void *)&bytesread) != FR_OK)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
return AUDIO_ERROR_IO;
}
BufferCtl.state = BUFFER_OFFSET_NONE;
BufferCtl.fptr += bytesread;
}
/* Display elapsed time */
elapsed_time = BufferCtl.fptr / WaveFormat.ByteRate;
if(prev_elapsed_time != elapsed_time)
{
prev_elapsed_time = elapsed_time;
sprintf((char *)str, "[%02d:%02d]", (int)(elapsed_time /60), (int)(elapsed_time%60));
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(263, LINE(8), str, LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
}
break;
case AUDIO_STATE_STOP:
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AudioState = AUDIO_STATE_IDLE;
audio_error = AUDIO_ERROR_IO;
break;
case AUDIO_STATE_NEXT:
if(++FilePos >= AUDIO_GetWavObjectNumber())
{
FilePos = 0;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_PLAYER_Start(FilePos);
break;
case AUDIO_STATE_PREVIOUS:
if(--FilePos < 0)
{
FilePos = AUDIO_GetWavObjectNumber() - 1;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_PLAYER_Start(FilePos);
break;
case AUDIO_STATE_PAUSE:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PAUSE]", LEFT_MODE);
BSP_AUDIO_OUT_Pause();
AudioState = AUDIO_STATE_WAIT;
break;
case AUDIO_STATE_RESUME:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PLAY ]", LEFT_MODE);
BSP_AUDIO_OUT_Resume();
AudioState = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_UP:
if( uwVolume <= 90)
{
uwVolume += 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
AudioState = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_DOWN:
if( uwVolume >= 10)
{
uwVolume -= 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
AudioState = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_WAIT:
case AUDIO_STATE_IDLE:
case AUDIO_STATE_INIT:
default:
/* Do Nothing */
break;
}
return audio_error;
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 168 MHz */
SystemClock_Config();
/* Configure LEDs, Push buttons and LCD available on EVAL board ************/
BSP_LED_Init(LED1);
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
BSP_LED_Init(LED4);
/* Configure push Buttons */
/* Key button used for Pause/Resume */
BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
/* Wakeup button used for Volume High */
BSP_PB_Init(BUTTON_WAKEUP, BUTTON_MODE_GPIO);
/* Tamper button used for Volume Low */
BSP_PB_Init(BUTTON_TAMPER, BUTTON_MODE_GPIO);
/* Initialize the LCD */
BSP_LCD_Init();
/* Display message on EVAL LCD **********************************************/
/* Clear the LCD */
BSP_LCD_Clear(LCD_COLOR_BLUE);
/* Set the LCD Back Color */
BSP_LCD_SetBackColor(LCD_COLOR_BLUE);
/* Set the LCD Text Color */
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_DisplayStringAtLine(0, (uint8_t *)MESSAGE1);
BSP_LCD_DisplayStringAtLine(1, (uint8_t *)MESSAGE2);
BSP_LCD_DisplayStringAtLine(2, (uint8_t *)MESSAGE3);
/* Turn On LEDs available on EVAL *******************************************/
BSP_LED_On(LED1);
BSP_LED_On(LED2);
BSP_LED_On(LED3);
BSP_LED_On(LED4);
/* Initialize the Audio codec and all related peripherals (I2S, I2C, IOExpander, IOs...) */
if(AUDIO_Init() == AUDIO_ERROR_NONE)
{
BSP_LCD_DisplayStringAtLine(3, (uint8_t *)"====================");
BSP_LCD_DisplayStringAtLine(4, (uint8_t *)"Key : Play/Pause ");
BSP_LCD_DisplayStringAtLine(5, (uint8_t *)"Tamper: Vol+/Headph");
BSP_LCD_DisplayStringAtLine(6, (uint8_t *)"Wakeup: Vol-/Spkr ");
BSP_LCD_DisplayStringAtLine(7, (uint8_t *)"====================");
BSP_LCD_DisplayStringAtLine(8, (uint8_t *)" AUDIO CODEC OK ");
}
else
{
BSP_LCD_DisplayStringAtLine(4, (uint8_t *)" AUDIO CODEC FAIL ");
BSP_LCD_DisplayStringAtLine(5, (uint8_t *)" Try to reset board ");
}
/*
Start playing the file from a circular buffer, once the DMA is enabled, it is
always in running state. Application has to fill the buffer with the audio data
using Transfer complete and/or half transfer complete interrupts callbacks
(EVAL_AUDIO_TransferComplete_CallBack() or EVAL_AUDIO_HalfTransfer_CallBack()...
*/
AUDIO_Start();
/* Display the state on the screen */
BSP_LCD_DisplayStringAtLine(8, (uint8_t *)" PLAYING ");
/* Infinite loop */
while (1)
{
/* Check on the Pause/Resume button */
if(BSP_PB_GetState(BUTTON_KEY) == RESET)
{
/* Wait to avoid rebound */
while (BSP_PB_GetState(BUTTON_KEY) == RESET);
if(uwCommand == AUDIO_PAUSE)
{
BSP_AUDIO_OUT_Pause();
/* Display the current state of the player */
BSP_LCD_DisplayStringAtLine(8, (uint8_t *)" PAUSED ");
/* Next time Resume command should be processed */
uwCommand = AUDIO_RESUME;
/* Push buttons will be used to switch between Speaker and Headphone modes */
uwSpHpSwitch = 1;
}
else
{
BSP_AUDIO_OUT_Resume();
/* Display the current state of the player */
BSP_LCD_DisplayStringAtLine(8, (uint8_t *)" PLAYING ");
/* Next time Pause command should be processed */
uwCommand = AUDIO_PAUSE;
/* Push buttons will be used to control volume level */
uwSpHpSwitch = 0;
}
}
/* Check on the Volume high button */
if (BSP_PB_GetState(BUTTON_WAKEUP) != RESET)
{
/* Check if the current state is paused (push buttons are used for volume control or for
speaker/headphone mode switching) */
if (uwSpHpSwitch)
{
/* Set output to Speaker */
BSP_AUDIO_OUT_SetOutputMode(OUTPUT_DEVICE_SPEAKER);
/* Display the current state of the player */
BSP_LCD_DisplayStringAtLine(9, (uint8_t *)" SPEAKER ");
}
else
{
/* Wait to avoid rebound */
while (BSP_PB_GetState(BUTTON_WAKEUP) != RESET);
/* Decrease volume by 5% */
if (uwVolume > 5)
uwVolume -= 5;
else
uwVolume = 0;
/* Apply the new volume to the codec */
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAtLine(9, (uint8_t *)" VOL: - ");
}
}
/* Check on the Volume high button */
if (BSP_PB_GetState(BUTTON_TAMPER) == RESET)
{
/* Check if the current state is paused (push buttons are used for volume control or for
speaker/headphone mode switching) */
if (uwSpHpSwitch)
{
/* Set output to Headphone */
BSP_AUDIO_OUT_SetOutputMode(OUTPUT_DEVICE_HEADPHONE);
/* Display the current state of the player */
BSP_LCD_DisplayStringAtLine(9, (uint8_t *)" HEADPHONE ");
}
else
{
/* Wait to avoid rebound */
while (BSP_PB_GetState(BUTTON_TAMPER) == RESET);
/* Increase volume by 5% */
if (uwVolume < 95)
uwVolume += 5;
else
uwVolume = 100;
/* Apply the new volume to the codec */
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAtLine(9, (uint8_t *)" VOL: + ");
}
}
/* Toggle LED3 */
BSP_LED_Toggle(LED3);
/* Insert 100 ms delay */
HAL_Delay(100);
/* Toggle LED2 */
BSP_LED_Toggle(LED2);
/* Insert 100 ms delay */
HAL_Delay(100);
}
}
/**
* @brief Test Audio Hardware.
* The main objective of this test is to check the hardware connection of the
* Audio peripheral.
* @param None
* @retval None
*/
void AudioPlay_demo(void)
{
WAVE_FormatTypeDef *waveformat = NULL;
uint8_t Volume_string[20] = {0};
AudioPlay_SetHint();
/* Configuration of the EXTI for the joystick SEL push button for pause/resume */
/* UP/DOWN push buttons for change the volume */
BSP_PB_Init(BUTTON_SEL, BUTTON_MODE_EXTI);
BSP_PB_Init(BUTTON_UP, BUTTON_MODE_EXTI);
BSP_PB_Init(BUTTON_DOWN, BUTTON_MODE_EXTI);
/* Retrieve Wave Sample rate*/
waveformat = (WAVE_FormatTypeDef*) AUDIO_FILE_ADDRESS;
AudioPlay_DisplayInfos(waveformat);
/* Initialize Audio Device */
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_HEADPHONE, volume, waveformat->SampleRate) != 0)
{
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, 130, (uint8_t*)"Initialization problem", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 145, (uint8_t*)"Audio Codec not detected", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 160, (uint8_t*)"Verify that jumper JP4 and JP5", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 175, (uint8_t*)"are well set to I2C2 position", CENTER_MODE);
Error_Handler();
}
/* Set the total number of data to be played */
AudioTotalSize = (AUDIO_FILE_SIZE / AUDIODATA_SIZE);
/* Set the current audio pointer position */
CurrentPos = (uint16_t *)(AUDIO_FILE_ADDRESS);
/* Start the audio player */
if(BSP_AUDIO_OUT_Play(CurrentPos,DMA_MAX((AudioTotalSize))) != 0)
{
Error_Handler();
}
/* Turn ON LED green: start of Audio file play */
BSP_LED_On(LED_GREEN);
/* Update the remaining number of data to be played */
AudioRemSize = AudioTotalSize - DMA_MAX(AudioTotalSize);
/* Update the current audio pointer position */
CurrentPos += DMA_MAX(AudioTotalSize);
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, (uint8_t *)"Playback on-going", LEFT_MODE);
sprintf((char *) Volume_string, " Volume : %d%% ", volume);
BSP_LCD_DisplayStringAt((uint16_t)(-20), BSP_LCD_GetYSize()-30, Volume_string, RIGHT_MODE);
/* Infinite loop */
while(!CheckForUserInput())
{
if (PauseResumeStatus == PAUSE_STATUS)
{
/* Turn ON LED orange: Audio play in pause */
BSP_LED_On(LED_ORANGE);
/* Pause playing */
if(BSP_AUDIO_OUT_Pause() != 0)
{
Error_Handler();
}
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, (uint8_t *)"Playback paused ", LEFT_MODE);
PauseResumeStatus = IDLE_STATUS;
}
else if (PauseResumeStatus == RESUME_STATUS)
{
/* Turn OFF LED orange: Audio play running */
BSP_LED_Off(LED_ORANGE);
/* Resume playing */
if(BSP_AUDIO_OUT_Resume() != 0)
{
Error_Handler();
}
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, (uint8_t *)"Playback on-going", LEFT_MODE);
PauseResumeStatus = IDLE_STATUS;
}
if (VolumeChange != 0)
{
VolumeChange = 0;
if(BSP_AUDIO_OUT_SetVolume(volume) != 0)
{
Error_Handler();
}
sprintf((char *) Volume_string, " Volume : %d%% ", volume);
BSP_LCD_DisplayStringAt((uint16_t)(-20), BSP_LCD_GetYSize()-30, Volume_string, RIGHT_MODE);
}
}
/* Reset the EXTI configuration for Joystick SEL, UP and DOWN push buttons */
/* Configuration of the joystick in GPIO mode and no more EXTI */
BSP_PB_Init(BUTTON_SEL, BUTTON_MODE_GPIO);
BSP_PB_Init(BUTTON_UP, BUTTON_MODE_GPIO);
BSP_PB_Init(BUTTON_DOWN, BUTTON_MODE_GPIO);
/* Stop Player before close Test */
if (BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW) != AUDIO_OK)
{
/* Audio Stop error */
Error_Handler();
}
else
{
/* Turn OFF LED green: stop of Audio file play */
BSP_LED_Off(LED_GREEN);
BSP_LED_Off(LED_ORANGE);
}
}
/**
* @brief Test Audio Hardware.
* The main objective of this test is to check the hardware connection of the
* Audio peripheral.
* @param None
* @retval None
*/
void AudioPlay_Test(void)
{
/* Initial volume level (from 0 (Mute) to 100 (Max)) */
__IO uint8_t volume = 70;
/* Initialize MEMS Accelerometer mounted on STM32F4-Discovery board */
if(BSP_ACCELERO_Init() != ACCELERO_OK)
{
/* Initialization Error */
Error_Handler();
}
/* MEMS Accelerometer configure to manage PAUSE, RESUME operations */
BSP_ACCELERO_Click_ITConfig();
/* Turn ON LED6: start of Audio file play */
BSP_LED_On(LED6);
/* Retrieve Wave Sample rate*/
waveformat = (WAVE_FormatTypeDef*) AUDIO_FILE_ADDRESS;
/* Initialize Audio Device */
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_AUTO, volume, waveformat->SampleRate) != 0)
{
Error_Handler();
}
/*Set variable used to stop player before starting */
UserPressButton = 0;
AudioTest = 0;
/* Set the total number of data to be played */
AudioTotalSize = AUDIO_FILE_SIZE;
/* Set the current audio pointer position */
CurrentPos = (uint16_t *)(AUDIO_FILE_ADDRESS);
/* Start the audio player */
BSP_AUDIO_OUT_Play(CurrentPos, AudioTotalSize);
/* Update the remaining number of data to be played */
AudioRemSize = AudioTotalSize - AUDIODATA_SIZE * DMA_MAX(AudioTotalSize);
/* Update the current audio pointer position */
CurrentPos += DMA_MAX(AudioTotalSize);
/* Infinite loop */
while(!UserPressButton)
{
if (PauseResumeStatus == PAUSE_STATUS)
{
/* Turn ON LED4: Audio play in pause */
BSP_LED_On(LED4);
/* Pause playing */
BSP_AUDIO_OUT_Pause();
PauseResumeStatus = IDLE_STATUS;
}
else if (PauseResumeStatus == RESUME_STATUS)
{
/* Turn OFF LED4: Audio play running */
BSP_LED_Off(LED4);
/* Resume playing */
BSP_AUDIO_OUT_Resume();
PauseResumeStatus = IDLE_STATUS;
}
}
/* Stop Player before close Test */
if (BSP_AUDIO_OUT_Stop(CODEC_PDWN_HW) != AUDIO_OK)
{
/* Audio Stop error */
Error_Handler();
}
}
/**
* @brief Manages Audio process.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Process(void)
{
uint32_t bytesread, elapsed_time;
static uint32_t prev_elapsed_time = 0xFFFFFFFF;
uint8_t str[10];
AUDIO_ErrorTypeDef error_state = AUDIO_ERROR_NONE;
switch(audio_state)
{
case AUDIO_STATE_PLAY:
if(buffer_ctl.fptr >= wav_info.FileSize)
{
error_state = AUDIO_ERROR_EOF;
}
if(buffer_ctl.offset == BUFFER_OFFSET_HALF)
{
if(MTP_GetData(file_pos,
buffer_ctl.fptr,
AUDIO_BUFFER_SIZE /2,
&buffer_ctl.buff[0],
&bytesread)> 0)
{
error_state = AUDIO_ERROR_IO;
}
buffer_ctl.offset = BUFFER_OFFSET_NONE;
buffer_ctl.fptr += bytesread;
}
if(buffer_ctl.offset == BUFFER_OFFSET_FULL)
{
if(MTP_GetData(file_pos,
buffer_ctl.fptr,
AUDIO_BUFFER_SIZE /2,
&buffer_ctl.buff[AUDIO_BUFFER_SIZE /2],
&bytesread)> 0)
{
error_state = AUDIO_ERROR_IO;
}
buffer_ctl.offset = BUFFER_OFFSET_NONE;
buffer_ctl.fptr += bytesread;
}
/* Display elapsed time */
elapsed_time = buffer_ctl.fptr / wav_info.ByteRate;
if(prev_elapsed_time != elapsed_time)
{
prev_elapsed_time = elapsed_time;
sprintf((char *)str, "[%02lu:%02lu]", elapsed_time /60, elapsed_time%60);
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(263, LINE(8), str, LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
}
break;
case AUDIO_STATE_STOP:
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
audio_state = AUDIO_STATE_IDLE;
error_state = AUDIO_ERROR_IO;
break;
case AUDIO_STATE_NEXT:
if(++file_pos >= MTP_GetWavObjectNumber())
{
file_pos = 0;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PREVIOUS:
if(--file_pos < 0)
{
file_pos = MTP_GetWavObjectNumber() - 1;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PAUSE:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PAUSE]", LEFT_MODE);
BSP_AUDIO_OUT_Pause();
audio_state = AUDIO_STATE_WAIT;
break;
case AUDIO_STATE_RESUME:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PLAY ]", LEFT_MODE);
BSP_AUDIO_OUT_Resume();
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_UP:
if(uwVolume <= 90)
{
uwVolume += 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_DOWN:
if(uwVolume >= 10)
{
uwVolume -= 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_WAIT:
case AUDIO_STATE_CONFIG:
case AUDIO_STATE_IDLE:
case AUDIO_STATE_INIT:
default:
/* Do Nothing */
break;
}
return error_state;
}
/**
* @brief Audio Play demo
* @param None
* @retval None
*/
void AudioPlay_demo (void)
{
uint8_t ts_status = TS_OK;
uint32_t *AudioFreq_ptr;
AudioFreq_ptr = AudioFreq+6; /*AF_48K*/
uint8_t FreqStr[256] = {0};
Point Points2[] = {{100, 140}, {160, 180}, {100, 220}};
uwPauseEnabledStatus = 1; /* 0 when audio is running, 1 when Pause is on */
uwVolume = AUDIO_DEFAULT_VOLUME;
if (TouchScreen_IsCalibrationDone() == 0)
{
ts_status = Touchscreen_Calibration();
if(ts_status == TS_OK)
{
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"Touchscreen calibration success.", CENTER_MODE);
}
else
{
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"ERROR : touchscreen not yet calibrated.", CENTER_MODE);
ts_status = TS_ERROR;
}
} /* of if (TouchScreen_IsCalibrationDone() == 0) */
AudioPlay_SetHint();
BSP_LCD_SetFont(&Font20);
/* if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_SPEAKER, uwVolume, *AudioFreq_ptr) == 0)
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_BOTH, uwVolume, *AudioFreq_ptr) == 0)*/
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_BOTH, uwVolume, *AudioFreq_ptr) == 0)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_DisplayStringAt(0, LINE(6), (uint8_t *)" AUDIO CODEC OK ", CENTER_MODE);
}
else
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, LINE(6), (uint8_t *)" AUDIO CODEC FAIL ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(7), (uint8_t *)" Try to reset board ", CENTER_MODE);
}
/*
Start playing the file from a circular buffer, once the DMA is enabled, it is
always in running state. Application has to fill the buffer with the audio data
using Transfer complete and/or half transfer complete interrupts callbacks
(DISCOVERY_AUDIO_TransferComplete_CallBack() or DISCOVERY_AUDIO_HalfTransfer_CallBack()...
*/
AUDIO_Play_Start((uint32_t *)AUDIO_SRC_FILE_ADDRESS, (uint32_t)AUDIO_FILE_SIZE);
/* Display the state on the screen */
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_DisplayStringAt(0, LINE(8), (uint8_t *)" PLAYING... ", CENTER_MODE);
sprintf((char*)FreqStr, " VOL: %3lu ", uwVolume);
BSP_LCD_DisplayStringAt(0, LINE(9), (uint8_t *)FreqStr, CENTER_MODE);
sprintf((char*)FreqStr, " FREQ: %6lu ", *AudioFreq_ptr);
BSP_LCD_DisplayStringAt(0, LINE(10), (uint8_t *)FreqStr, CENTER_MODE);
BSP_LCD_SetFont(&Font16);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 40, (uint8_t *)"Hear nothing ? Have you copied the audio file with STM-LINK UTILITY ?", CENTER_MODE);
if(ts_status == TS_OK)
{
/* Set touchscreen in Interrupt mode and program EXTI accordingly on falling edge of TS_INT pin */
ts_status = BSP_TS_ITConfig();
BSP_TEST_APPLI_ASSERT(ts_status != TS_OK);
Touchscreen_DrawBackground_Circle_Buttons(16);
}
BSP_LCD_SetFont(&Font20);
/* draw play triangle */
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_FillPolygon(Points2, 3);
/* IMPORTANT:
AUDIO_Play_Process() is called by the SysTick Handler, as it should be called
within a periodic process */
/* Infinite loop */
while (1)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
/* Get the TouchScreen State */
ts_action = (TS_ActionTypeDef) TouchScreen_GetTouchPosition();
switch (ts_action)
{
case TS_ACT_VOLUME_UP:
/* Increase volume by 5% */
if (uwVolume < 95)
uwVolume += 5;
else
uwVolume = 100;
sprintf((char*)FreqStr, " VOL: %3lu ", uwVolume);
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAt(0, LINE(9), (uint8_t *)FreqStr, CENTER_MODE);
break;
case TS_ACT_VOLUME_DOWN:
/* Decrease volume by 5% */
if (uwVolume > 5)
uwVolume -= 5;
else
uwVolume = 0;
sprintf((char*)FreqStr, " VOL: %3lu ", uwVolume);
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAt(0, LINE(9), (uint8_t *)FreqStr, CENTER_MODE);
break;
case TS_ACT_FREQ_DOWN:
/*Decrease Frequency */
if (*AudioFreq_ptr != 8000)
{
AudioFreq_ptr--;
sprintf((char*)FreqStr, " FREQ: %6lu ", *AudioFreq_ptr);
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(*AudioFreq_ptr);
BSP_AUDIO_OUT_Resume();
BSP_AUDIO_OUT_SetVolume(uwVolume);
}
BSP_LCD_DisplayStringAt(0, LINE(10), (uint8_t *)FreqStr, CENTER_MODE);
break;
case TS_ACT_FREQ_UP:
/* Increase Frequency */
if (*AudioFreq_ptr != 96000)
{
AudioFreq_ptr++;
sprintf((char*)FreqStr, " FREQ: %6lu ", *AudioFreq_ptr);
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(*AudioFreq_ptr);
BSP_AUDIO_OUT_Resume();
BSP_AUDIO_OUT_SetVolume(uwVolume);
}
BSP_LCD_DisplayStringAt(0, LINE(10), (uint8_t *)FreqStr, CENTER_MODE);
break;
case TS_ACT_PAUSE:
/* Set Pause / Resume */
if (uwPauseEnabledStatus == 1)
{ /* Pause is enabled, call Resume */
BSP_AUDIO_OUT_Resume();
uwPauseEnabledStatus = 0;
BSP_LCD_DisplayStringAt(0, LINE(8), (uint8_t *)" PLAYING... ", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_FillPolygon(Points2, 3);
BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
BSP_LCD_FillRect(100, 140, 25 , 80);
BSP_LCD_FillRect(140, 140, 25 , 80);
}
else
{ /* Pause the playback */
BSP_AUDIO_OUT_Pause();
uwPauseEnabledStatus = 1;
BSP_LCD_DisplayStringAt(0, LINE(8), (uint8_t *)" PAUSE ... ", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_FillRect(100, 140, 80 , 80);
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_FillPolygon(Points2, 3);
}
HAL_Delay(200);
break;
default:
break;
}
/* Toggle LED4 */
BSP_LED_Toggle(LED4);
/* Insert 100 ms delay */
HAL_Delay(100);
if (CheckForUserInput() > 0)
{
/* Set LED4 */
BSP_LED_On(LED4);
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
return;
}
}
}
/**
* @brief Audio Play demo
* @param None
* @retval None
*/
void AudioPlay_demo (void)
{
uint32_t *AudioFreq_ptr;
uint8_t FreqStr[256] = {0};
TS_StateTypeDef TS_State;
AudioFreq_ptr = AudioFreq+6; /*AF_48K*/
uwPauseEnabledStatus = 1; /* 0 when audio is running, 1 when Pause is on */
uwVolume = 70;
Audio_SetHint();
if (BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_HEADPHONE, uwVolume, *AudioFreq_ptr) == 0)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 95, (uint8_t *)" AUDIO CODEC OK ", CENTER_MODE);
}
else
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 95, (uint8_t *)" AUDIO CODEC FAIL ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 80, (uint8_t *)" Try to reset board ", CENTER_MODE);
}
if (BSP_TS_Init(BSP_LCD_GetXSize(), BSP_LCD_GetYSize()) != TS_OK)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"ERROR", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 50, (uint8_t *)"Touchscreen cannot be initialized", CENTER_MODE);
}
/*
Start playing the file from a circular buffer, once the DMA is enabled, it is
always in running state. Application has to fill the buffer with the audio data
using Transfer complete and/or half transfer complete interrupts callbacks
(DISCOVERY_AUDIO_TransferComplete_CallBack() or DISCOVERY_AUDIO_HalfTransfer_CallBack()...
*/
AUDIO_Start(AUDIO_FILE_ADDRESS, AUDIO_FILE_SIZE);
/* Display the state on the screen */
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 80, (uint8_t *)" PLAYING... ", CENTER_MODE);
sprintf((char*)FreqStr, " VOL: %3lu ", uwVolume);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)FreqStr, CENTER_MODE);
sprintf((char*)FreqStr, " FREQ: %6lu ", *AudioFreq_ptr);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 50, (uint8_t *)FreqStr, CENTER_MODE);
BSP_AUDIO_OUT_SetVolume(70);
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
/* Infinite loop */
while (1)
{
/* Check in polling mode in touch screen the touch status and coordinates */
/* if touch occurred */
BSP_TS_GetState(&TS_State);
if(TS_State.touchDetected == 1)
{
if (TS_State.touchY[0] < 30)
{
/* Increase volume by 5% */
if (uwVolume < 95)
uwVolume += 5;
else
uwVolume = 100;
sprintf((char*)FreqStr, " VOL: %3lu ", uwVolume);
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)FreqStr, CENTER_MODE);
}
else if (TS_State.touchY[0] > (BSP_LCD_GetYSize() - 30))
{
/* Decrease volume by 5% */
if (uwVolume > 5)
uwVolume -= 5;
else
uwVolume = 0;
sprintf((char*)FreqStr, " VOL: %3lu ", uwVolume);
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)FreqStr, CENTER_MODE);
}
else if (TS_State.touchX[0] < 30)
{
/*Decrease Frequency */
if (*AudioFreq_ptr != 8000)
{
AudioFreq_ptr--;
sprintf((char*)FreqStr, " FREQ: %6lu ", *AudioFreq_ptr);
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(*AudioFreq_ptr);
BSP_AUDIO_OUT_Resume();
BSP_AUDIO_OUT_SetVolume(uwVolume);
}
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 50, (uint8_t *)FreqStr, CENTER_MODE);
}
else if (TS_State.touchX[0] > (BSP_LCD_GetXSize() - 30))
{
/* Increase Frequency */
if (*AudioFreq_ptr != 96000)
{
AudioFreq_ptr++;
sprintf((char*)FreqStr, " FREQ: %6lu ", *AudioFreq_ptr);
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(*AudioFreq_ptr);
BSP_AUDIO_OUT_Resume();
BSP_AUDIO_OUT_SetVolume(uwVolume);
}
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 50, (uint8_t *)FreqStr, CENTER_MODE);
}
/* Wait for touch screen no touch detected */
do
{
BSP_TS_GetState(&TS_State);
}while(TS_State.touchDetected > 0);
}
if (TS_State.touchDetected >= 2)
{
/* Set Pause / Resume */
if (uwPauseEnabledStatus == 1)
{ /* Pause is enabled, call Resume */
BSP_AUDIO_OUT_Resume();
uwPauseEnabledStatus = 0;
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 80, (uint8_t *)" PLAYING... ", CENTER_MODE);
}
else
{ /* Pause the playback */
BSP_AUDIO_OUT_Pause();
uwPauseEnabledStatus = 1;
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 80, (uint8_t *)" PAUSE ... ", CENTER_MODE);
}
/* Wait for touch screen no touch detected */
do
{
BSP_TS_GetState(&TS_State);
}while(TS_State.touchDetected > 0);
}
if (CheckForUserInput() > 0)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
BSP_AUDIO_OUT_DeInit();
return;
}
}
}
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
WAVE_FormatTypeDef *waveformat = NULL;
/* STM32F3xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Initialize the LEDs */
BSP_LED_Init(LED1);
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
BSP_LED_Init(LED4);
/* Configure the system clock to 72 MHz */
SystemClock_Config();
/*##-1- Initialize the Keys Push buttons and LCD #####################*/
/* Initialize the Push buttons */
/* Key push button used for Pause/Resume */
BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
/* Joystick UP push button used for Volume High */
BSP_PB_Init(BUTTON_DOWN, BUTTON_MODE_GPIO);
/* Joystick DOWN push button used for Volume Low */
BSP_PB_Init(BUTTON_UP, BUTTON_MODE_GPIO);
/* Initialize the LCD */
BSP_LCD_Init();
/*##-2- Display welcome messages on LCD ####################################*/
Display_ExampleDescription();
/* Wait for Key push-button press before starting the Example */
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
{
}
/* Wait for Key push-button release before starting the Example */
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_SET)
{
}
/*##-3- Display Example Template ###########################################*/
AudioPlay_SetHint();
/*##-4- Turn on LEDs available on STM32303E-EVAL RevC Eval board ###################*/
BSP_LED_On(LED1);
BSP_LED_On(LED2);
BSP_LED_On(LED3);
BSP_LED_On(LED4);
/* Initialize the Audio codec and all related peripherals (I2S, I2C, IOs...) */
if (BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_AUTO, uwVolume, I2S_AUDIOFREQ_8K) != AUDIO_OK)
{
/* Initialization Error */
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, 115, (uint8_t*)"Initialization problem", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 130, (uint8_t*)"Verify that jumper JP5 and JP6", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 145, (uint8_t*)"are well set to I2C2 position", CENTER_MODE);
Error_Handler();
}
else
{
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_SetFont(&Font12);
BSP_LCD_DisplayStringAt(20, 100, (uint8_t *)"Audio Codec Ready", LEFT_MODE);
}
/*##-5- Display information related to control and Playback state #*/
/* Retrieve Wave Sample rate*/
waveformat = (WAVE_FormatTypeDef*)AUDIO_FILE_ADDRESS;
AudioPlay_DisplayInfos(waveformat);
/*##-6- Start AUDIO playback #####################################*/
/*
Normal mode description:
Start playing the audio file (using DMA).
Using this mode, the application can run other tasks in parallel since
the DMA is handling the Audio Transfer instead of the CPU.
The only task remaining for the CPU will be the management of the DMA
Transfer Complete interrupt or the Half Transfer Complete interrupt in
order to load again the buffer and to calculate the remaining data.
Circular mode description:
Start playing the file from a circular buffer, once the DMA is enabled it
always run. User has to fill periodically the buffer with the audio data
using Transfer complete and/or half transfer complete interrupts callbacks
(EVAL_AUDIO_TransferComplete_CallBack() or EVAL_AUDIO_HalfTransfer_CallBack()...
In this case the audio data file is smaller than the DMA max buffer
size 65535 so there is no need to load buffer continuously or manage the
transfer complete or Half transfer interrupts callbacks. */
/* Set the total number of data to be played (count in half-word) */
AudioTotalSize = (AUDIO_FILE_SIZE - AUDIO_START_OFFSET_ADDRESS)/(waveformat->NbrChannels);
/* Set the current audio pointer position */
CurrentPos = (uint16_t*)(AUDIO_FILE_ADDRESS + AUDIO_START_OFFSET_ADDRESS);
/* Start the audio player */
BSP_AUDIO_OUT_Play((uint16_t*)CurrentPos, (uint32_t)(AUDIO_FILE_SIZE - AUDIO_START_OFFSET_ADDRESS));
/* Update the remaining number of data to be played */
AudioRemSize = AudioTotalSize - DMA_MAX(AudioTotalSize);
/* Update the current audio pointer position */
CurrentPos += DMA_MAX(AudioTotalSize);
/* Display the state on the screen */
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_DisplayStringAt(0, 160, (uint8_t *)"Playback on-going", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
/* Infinite loop */
while (1)
{
/* Check on the Pause/Resume button */
if (BSP_PB_GetState(BUTTON_KEY) == GPIO_PIN_RESET)
{
/* Wait to avoid rebound */
while (BSP_PB_GetState(BUTTON_KEY) == GPIO_PIN_RESET);
if (uwCommand == AUDIO_PAUSE)
{
BSP_AUDIO_OUT_Pause();
/* Display the current state of the player */
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_DisplayStringAt(0, 160, (uint8_t *)"Playback paused ", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
/* Next time Resume command should be processed */
uwCommand = AUDIO_RESUME;
}
else
{
BSP_AUDIO_OUT_Resume();
/* Display the current state of the player */
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_DisplayStringAt(0, 160, (uint8_t *)"Playback on-going", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
/* Next time Pause command should be processed */
uwCommand = AUDIO_PAUSE;
}
}
/* Check on the Volume Low button */
if (BSP_PB_GetState(BUTTON_DOWN) == GPIO_PIN_SET)
{
/* Wait to avoid rebound */
while (BSP_PB_GetState(BUTTON_DOWN) == GPIO_PIN_SET);
/* Decrease volume by 5% */
if (uwVolume > 5)
{
uwVolume -= 5;
}
else
{
uwVolume = 0;
}
/* Apply the new volume to the codec */
BSP_AUDIO_OUT_SetVolume(uwVolume);
sprintf((char *) Volume_string, " Volume : %lu%% ", uwVolume);
BSP_LCD_DisplayStringAt((uint16_t)(-6), BSP_LCD_GetYSize()-60, Volume_string, RIGHT_MODE);
}
/* Check on the Volume High button */
if (BSP_PB_GetState(BUTTON_UP) == GPIO_PIN_SET)
{
/* Wait to avoid rebound */
while (BSP_PB_GetState(BUTTON_UP) == GPIO_PIN_SET);
/* Increase volume by 5% */
if (uwVolume < 95)
{
uwVolume += 5;
}
else
{
uwVolume = 100;
}
/* Apply the new volume to the codec */
BSP_AUDIO_OUT_SetVolume(uwVolume);
sprintf((char *) Volume_string, " Volume : %lu%% ", uwVolume);
BSP_LCD_DisplayStringAt((uint16_t)(-6), BSP_LCD_GetYSize()-60, Volume_string, RIGHT_MODE);
}
/* Toggle LED3 */
BSP_LED_Toggle(LED3);
/* Insert 100 ms delay */
HAL_Delay(100);
/* Toggle LED2 */
BSP_LED_Toggle(LED2);
/* Insert 100 ms delay */
HAL_Delay(100);
}
}
/**
* @brief Test Audio Hardware.
* The main objective of this test is to check the hardware connection of the
* Audio peripheral.
* @param None
* @retval None
*/
void AudioPlay_demo(void)
{
WAVE_FormatTypeDef *waveformat = NULL;
uint8_t Volume_string[20] = {0};
AudioPlay_SetHint();
/* Configuration of the EXTI for the joystick SEL push button for pause/resume */
/* UP/DOWN push buttons for change the volume */
BSP_JOY_Init(JOY_MODE_EXTI);
/* Retrieve Wave Sample rate */
waveformat = (WAVE_FormatTypeDef*) AUDIO_FILE_ADDRESS;
/* Check waveformat validity */
/* In case of audio file pre-loaded into Flash memory, to check audio data */
/* integrity. */
if ((waveformat->SampleRate < SAMPLE_RATE_MIN) || (waveformat->SampleRate > SAMPLE_RATE_MAX))
{
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, 130, (uint8_t*)"Audio file not valid", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 145, (uint8_t*)"Check audio data integrity", CENTER_MODE);
Error_Handler();
}
/* Display audio file Wave parameters */
AudioPlay_DisplayInfos(waveformat);
/* Initialize Audio Device */
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_BOTH, volume, waveformat->SampleRate) != 0)
{
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, 130, (uint8_t*)"Initialization problem", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 145, (uint8_t*)"Audio Codec not detected", CENTER_MODE);
Error_Handler();
}
/* Set the total number of data to be played */
AudioTotalSize = (AUDIO_FILE_SIZE - AUDIO_START_ADDRESS) / 2;
/* Set the current audio pointer position */
CurrentPos = (uint16_t *)(AUDIO_FILE_ADDRESS);
/* Initialize Volume */
if(BSP_AUDIO_OUT_SetVolume(volume) != 0)
{
Error_Handler();
}
/* Start the audio player */
if(BSP_AUDIO_OUT_Play(CurrentPos, DMA_MAX(AudioTotalSize)) != 0)
{
Error_Handler();
}
/* Turn ON LED green: start of Audio file play */
BSP_LED_On(LED_GREEN);
/* Update the remaining number of data to be played */
AudioRemSize = AudioTotalSize - DMA_MAX(AudioTotalSize);
/* Update the current audio pointer position */
CurrentPos += DMA_MAX(AudioTotalSize);
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, (uint8_t *)"Playback on-going", LEFT_MODE);
sprintf((char *) Volume_string, " Volume : %d%% ", volume);
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, Volume_string, RIGHT_MODE);
/* Infinite loop */
while(!CheckForUserInput())
{
if (PauseResumeStatus == PAUSE_STATUS)
{
/* Turn ON LED orange: Audio play in pause */
BSP_LED_On(LED_ORANGE);
/* Pause playing */
if(BSP_AUDIO_OUT_Pause() != 0)
{
Error_Handler();
}
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, (uint8_t *)"Playback paused ", LEFT_MODE);
PauseResumeStatus = IDLE_STATUS;
}
else if (PauseResumeStatus == RESUME_STATUS)
{
/* Turn OFF LED orange: Audio play running */
BSP_LED_Off(LED_ORANGE);
/* Resume playing */
if(BSP_AUDIO_OUT_Resume() != 0)
{
Error_Handler();
}
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, (uint8_t *)"Playback on-going", LEFT_MODE);
PauseResumeStatus = IDLE_STATUS;
}
if (VolumeChange != 0)
{
VolumeChange = 0;
if(BSP_AUDIO_OUT_SetVolume(volume) != 0)
{
Error_Handler();
}
sprintf((char *) Volume_string, " Volume : %d%% ", volume);
BSP_LCD_DisplayStringAt(20, BSP_LCD_GetYSize()-30, Volume_string, RIGHT_MODE);
}
if (UserOutputMode != UserOutputModePreviousState)
{
/* Change audio output */
BSP_AUDIO_OUT_SetOutputMode(UserOutputMode);
UserOutputModePreviousState = UserOutputMode;
}
}
/* Reset the EXTI configuration for Joystick SEL, UP and DOWN push buttons */
/* Configuration of the joystick in GPIO mode and no more EXTI */
BSP_PB_Init(BUTTON_SEL, BUTTON_MODE_GPIO);
BSP_PB_Init(BUTTON_UP, BUTTON_MODE_GPIO);
BSP_PB_Init(BUTTON_DOWN, BUTTON_MODE_GPIO);
/* Stop Player before close Test */
if (BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW) != AUDIO_OK)
{
/* Audio Stop error */
Error_Handler();
}
else
{
/* Turn OFF LED green: stop of Audio file play */
BSP_LED_Off(LED_GREEN);
BSP_LED_Off(LED_ORANGE);
}
}
/**
* @brief Audio Play demo
* @param None
* @retval None
*/
void AudioPlay_demo (void)
{
uint32_t *AudioFreq_ptr;
uint8_t status = 0;
uint8_t FreqStr[256] = {0};
AudioFreq_ptr = AudioFreq+6; /*AF_48K*/
uwPauseEnabledStatus = 1; /* 0 when audio is running, 1 when Pause is on */
uwVolume = 50;
Audio_SetHint();
status = BSP_JOY_Init(JOY_MODE_GPIO);
if (status != IO_OK)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 100, (uint8_t *)"ERROR", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 85, (uint8_t *)"Joystick cannot be initialized", CENTER_MODE);
}
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_BOTH, uwVolume, *AudioFreq_ptr) == 0)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 100, (uint8_t *)" AUDIO CODEC OK ", CENTER_MODE);
}
else
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 100, (uint8_t *)" AUDIO CODEC FAIL ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 85, (uint8_t *)" Try to reset board ", CENTER_MODE);
}
/*
Start playing the file from a circular buffer, once the DMA is enabled, it is
always in running state. Application has to fill the buffer with the audio data
using Transfer complete and/or half transfer complete interrupts callbacks
(EVAL_AUDIO_TransferComplete_CallBack() or EVAL_AUDIO_HalfTransfer_CallBack()...
*/
AUDIO_Start();
/* Display the state on the screen */
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 85, (uint8_t *)" PLAYING... ", CENTER_MODE);
sprintf((char*)FreqStr," VOL: %lu ",uwVolume);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 55, (uint8_t *)FreqStr, CENTER_MODE);
sprintf((char*)FreqStr," FREQ: %lu ",*AudioFreq_ptr);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 40, (uint8_t *)FreqStr, CENTER_MODE);
/* IMPORTANT:
AUDIO_Process() is called by the SysTick Handler, as it should be called
within a periodic process */
/* Infinite loop */
while(1)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
/* Get the Joystick State */
JoyState = BSP_JOY_GetState();
switch(JoyState)
{
case JOY_UP:
/* Increase volume by 5% */
if (uwVolume < 95)
uwVolume += 5;
else
uwVolume = 100;
sprintf((char*)FreqStr," VOL: %lu ",uwVolume);
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 55, (uint8_t *)FreqStr, CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(14), (uint8_t *)" ", CENTER_MODE);
break;
case JOY_DOWN:
/* Decrease volume by 5% */
if (uwVolume > 5)
uwVolume -= 5;
else
uwVolume = 0;
sprintf((char*)FreqStr," VOL: %lu ",uwVolume);
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 55, (uint8_t *)FreqStr, CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(14), (uint8_t *)" ", CENTER_MODE);
break;
case JOY_LEFT:
/*Decrease Frequency */
if (*AudioFreq_ptr != 8000)
{
AudioFreq_ptr--;
sprintf((char*)FreqStr," FREQ: %lu ", *AudioFreq_ptr);
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(*AudioFreq_ptr);
BSP_AUDIO_OUT_Resume();
}
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 40, (uint8_t *)FreqStr, CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(14), (uint8_t *)" ", CENTER_MODE);
break;
case JOY_RIGHT:
/* Increase Frequency */
if (*AudioFreq_ptr != 96000)
{
AudioFreq_ptr++;
sprintf((char*)FreqStr," FREQ: %lu ",*AudioFreq_ptr);
BSP_AUDIO_OUT_Pause();
BSP_AUDIO_OUT_SetFrequency(*AudioFreq_ptr);
BSP_AUDIO_OUT_Resume();
}
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 40, (uint8_t *)FreqStr, CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(14), (uint8_t *)" ", CENTER_MODE);
break;
case JOY_SEL:
/* Set Pause / Resume */
if (uwPauseEnabledStatus == 1)
{ /* Pause is enabled, call Resume */
BSP_AUDIO_OUT_Resume();
uwPauseEnabledStatus = 0;
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 85, (uint8_t *)" PLAYING... ", CENTER_MODE);
} else
{ /* Pause the playback */
BSP_AUDIO_OUT_Pause();
uwPauseEnabledStatus = 1;
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize()- 85, (uint8_t *)" PAUSE ... ", CENTER_MODE);
}
BSP_LCD_DisplayStringAt(0, LINE(14), (uint8_t *)" ", CENTER_MODE);
HAL_Delay(200);
break;
default:
break;
}
/* Toggle LED3 */
BSP_LED_Toggle(LED3);
/* Insert 100 ms delay */
HAL_Delay(100);
/* Toggle LED2 */
BSP_LED_Toggle(LED2);
/* Insert 100 ms delay */
HAL_Delay(100);
if(CheckForUserInput() > 0)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
BSP_AUDIO_OUT_DeInit();
return;
}
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization: global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 180 MHz MHz */
SystemClock_Config();
/* -1- Initialize LEDs mounted on EVAL board */
/* Configure LED1*/
BSP_LED_Init(LED1);
/* -2- Configure User push-button in Gpio mode */
BSP_PB_Init(BUTTON_TAMPER, BUTTON_MODE_GPIO);
/* Initialize the LCD */
BSP_LCD_Init();
/* Display message on EVAL LCD **********************************************/
/* Clear the LCD */
BSP_LCD_Clear(LCD_COLOR_BLUE);
/* Set the LCD Back Color */
BSP_LCD_SetBackColor(LCD_COLOR_BLUE);
/* Set the LCD Text Color */
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_DisplayStringAt(0, LINE(0), (uint8_t *)MESSAGE1, CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(1), (uint8_t *)MESSAGE2, CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(2), (uint8_t *)MESSAGE3, CENTER_MODE);
/* Turn on LEDs available on EVAL *******************************************/
BSP_LED_On(LED1);
BSP_LED_On(LED3);
BSP_LCD_SetFont(&Font16);
/* Initialize the Audio codec and all related peripherals (SAI, I2C, IOs...) */
if(BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_BOTH, uwVolume, SAI_AUDIO_FREQUENCY_48K) == 0)
{
BSP_LCD_DisplayStringAt(0, LINE(5), (uint8_t *)"====================", CENTER_MODE);
BSP_LCD_SetFont(&Font12);
BSP_LCD_DisplayStringAt(0, LINE(8), (uint8_t *)"Short press on User button: Volume Down ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(9), (uint8_t *)"Long press on User button: Pause/Resume", CENTER_MODE);
BSP_LCD_SetFont(&Font16);
BSP_LCD_DisplayStringAt(0, LINE(8), (uint8_t *)"====================", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(9), (uint8_t *)" AUDIO CODEC OK ", CENTER_MODE);
}
else
{
BSP_LCD_DisplayStringAt(0, LINE(5), (uint8_t *)" AUDIO CODEC FAIL ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, LINE(6), (uint8_t *)" Try to reset board ", CENTER_MODE);
}
/*
Start playing the file from a circular buffer, once the DMA is enabled, it is
always in running state. Application has to fill the buffer with the audio data
using Transfer complete and/or half transfer complete interrupts callbacks
(EVAL_AUDIO_TransferComplete_CallBack() or EVAL_AUDIO_HalfTransfer_CallBack()...
*/
AUDIO_Start();
/* Display the state on the screen */
BSP_LCD_DisplayStringAt(0, LINE(10), (uint8_t *)" PLAYING... ", CENTER_MODE);
/* IMPORTANT:
AUDIO_Process() is called by the SysTick Handler, as it should be called
within a periodic process */
/* Infinite loop */
while(1)
{
if (BSP_PB_GetState(BUTTON_TAMPER) != RESET)
{
/* User push-button pressed, check if it is a long or a short press */
/* Insert 350 ms delay */
HAL_Delay(350);
if (BSP_PB_GetState(BUTTON_TAMPER) == RESET)
{
/* User push-button short press : Volume down */
/* Decrease volume by 15% */
if (uwVolume > 20)
{
uwVolume -= 15;
}
else
{
uwVolume = 100;
}
/* Apply the new volume to the codec */
BSP_AUDIO_OUT_SetVolume(uwVolume);
if (uwVolume > 85)
BSP_LCD_DisplayStringAt(0, LINE(11), (uint8_t *)" VOL: < X> ", CENTER_MODE);
else if (uwVolume > 70)
BSP_LCD_DisplayStringAt(0, LINE(11), (uint8_t *)" VOL: < X > ", CENTER_MODE);
else if (uwVolume > 55)
BSP_LCD_DisplayStringAt(0, LINE(11), (uint8_t *)" VOL: < X > ", CENTER_MODE);
else if (uwVolume > 40)
BSP_LCD_DisplayStringAt(0, LINE(11), (uint8_t *)" VOL: < X > ", CENTER_MODE);
else if (uwVolume > 25)
BSP_LCD_DisplayStringAt(0, LINE(11), (uint8_t *)" VOL: < X > ", CENTER_MODE);
else
BSP_LCD_DisplayStringAt(0, LINE(11), (uint8_t *)" VOL: <X > ", CENTER_MODE);
}
else
{
/* User push-button pressed for more then 350ms : Pause/Resume */
if (uwPauseEnabledStatus == 1)
{ /* Pause is enabled, call Resume */
BSP_AUDIO_OUT_Resume();
uwPauseEnabledStatus = 0;
BSP_LCD_DisplayStringAt(0, LINE(10), (uint8_t *)" PLAYING ... ", CENTER_MODE);
} else
{ /* Pause the playback */
BSP_AUDIO_OUT_Pause();
uwPauseEnabledStatus = 1;
BSP_LCD_DisplayStringAt(0, LINE(10), (uint8_t *)" PAUSE ... ", CENTER_MODE);
}
while (BSP_PB_GetState(BUTTON_TAMPER) != RESET);
}
}
/* Toggle LED1 */
BSP_LED_Toggle(LED1);
/* Insert 100 ms delay */
HAL_Delay(100);
}
}
/**
* @brief Manages Audio process.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_PLAYER_Process(void)
{
uint32_t bytesread, elapsed_time;
AUDIO_ErrorTypeDef audio_error = AUDIO_ERROR_NONE;
static uint32_t prev_elapsed_time = 0xFFFFFFFF;
uint8_t str[10];
switch(AudioState)
{
case AUDIO_STATE_PLAY:
if(BufferCtl.fptr >= WaveFormat.FileSize)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AudioState = AUDIO_STATE_NEXT;
}
if(BufferCtl.state == BUFFER_OFFSET_HALF)
{
if(f_read(&WavFile,
&BufferCtl.buff[0],
AUDIO_OUT_BUFFER_SIZE/2,
(void *)&bytesread) != FR_OK)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
return AUDIO_ERROR_IO;
}
BufferCtl.state = BUFFER_OFFSET_NONE;
BufferCtl.fptr += bytesread;
}
if(BufferCtl.state == BUFFER_OFFSET_FULL)
{
if(f_read(&WavFile,
&BufferCtl.buff[AUDIO_OUT_BUFFER_SIZE /2],
AUDIO_OUT_BUFFER_SIZE/2,
(void *)&bytesread) != FR_OK)
{
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
return AUDIO_ERROR_IO;
}
BufferCtl.state = BUFFER_OFFSET_NONE;
BufferCtl.fptr += bytesread;
}
/* Display elapsed time */
elapsed_time = BufferCtl.fptr / WaveFormat.ByteRate;
if(prev_elapsed_time != elapsed_time)
{
prev_elapsed_time = elapsed_time;
sprintf((char *)str, "[%02d:%02d]", (int)(elapsed_time /60), (int)(elapsed_time%60));
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(263, LINE(8), str, LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
}
/* Update audio state machine according to touch acquisition */
AUDIO_AcquireTouchButtons();
break;
case AUDIO_STATE_STOP:
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_FillRect(TOUCH_STOP_XMIN, TOUCH_STOP_YMIN , /* Stop rectangle */
TOUCH_STOP_XMAX - TOUCH_STOP_XMIN,
TOUCH_STOP_YMAX - TOUCH_STOP_YMIN);
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AudioState = AUDIO_STATE_IDLE;
audio_error = AUDIO_ERROR_IO;
break;
case AUDIO_STATE_NEXT:
if(++FilePos >= AUDIO_GetWavObjectNumber())
{
FilePos = 0;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_PLAYER_Start(FilePos);
break;
case AUDIO_STATE_PREVIOUS:
if(--FilePos < 0)
{
FilePos = AUDIO_GetWavObjectNumber() - 1;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_PLAYER_Start(FilePos);
break;
case AUDIO_STATE_PAUSE:
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(250, LINE(9), (uint8_t *)" [PAUSE]", LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_RED); /* Display red pause rectangles */
BSP_LCD_FillRect(TOUCH_PAUSE_XMIN, TOUCH_PAUSE_YMIN , 15, TOUCH_PAUSE_YMAX - TOUCH_PAUSE_YMIN);
BSP_LCD_FillRect(TOUCH_PAUSE_XMIN + 20, TOUCH_PAUSE_YMIN, 15, TOUCH_PAUSE_YMAX - TOUCH_PAUSE_YMIN);
BSP_AUDIO_OUT_Pause();
AudioState = AUDIO_STATE_WAIT;
break;
case AUDIO_STATE_RESUME:
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(250, LINE(9), (uint8_t *)" [PLAY ]", LEFT_MODE);
/* Display blue cyan pause rectangles */
BSP_LCD_FillRect(TOUCH_PAUSE_XMIN, TOUCH_PAUSE_YMIN , 15, TOUCH_PAUSE_YMAX - TOUCH_PAUSE_YMIN);
BSP_LCD_FillRect(TOUCH_PAUSE_XMIN + 20, TOUCH_PAUSE_YMIN, 15, TOUCH_PAUSE_YMAX - TOUCH_PAUSE_YMIN);
BSP_AUDIO_OUT_Resume();
AudioState = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_UP:
if( uwVolume <= 90)
{
uwVolume += 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
sprintf((char *)str, "Volume : %lu ", uwVolume);
BSP_LCD_DisplayStringAtLine(9, str);
AudioState = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_DOWN:
if( uwVolume >= 10)
{
uwVolume -= 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
sprintf((char *)str, "Volume : %lu ", uwVolume);
BSP_LCD_DisplayStringAtLine(9, str);
AudioState = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_WAIT:
case AUDIO_STATE_IDLE:
case AUDIO_STATE_INIT:
default:
/* Update audio state machine according to touch acquisition */
AUDIO_AcquireTouchButtons();
break;
}
return audio_error;
}