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/**
******************************************************************************
* @file BSP/Src/audio.c
* @author MCD Application Team
* @brief This example code shows how to use the audio feature in the
* stm32469i_eval driver
******************************************************************************
* @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"
#include "stm32446e_eval_audio.h"
#include <stdio.h>
/** @addtogroup STM32F4xx_HAL_Examples
* @{
*/
/** @addtogroup BSP
* @{
*/
/* Private define ------------------------------------------------------------*/
/*Since SysTick is set to 1ms (unless to set it quicker) */
/* to run up to 48khz, a buffer around 1000 (or more) is requested*/
/* to run up to 96khz, a buffer around 2000 (or more) is requested*/
#define AUDIO_BUFFER_SIZE 2048
#define AUDIO_DEFAULT_VOLUME 70
/* Audio file size and start address are defined here since the audio file is
stored in Flash memory as a constant table of 16-bit data */
#define AUDIO_FILE_SIZE 0x3E000
#define AUDIO_START_OFFSET_ADDRESS 0 /* Offset relative to audio file header size */
#define AUDIO_FILE_ADDRESS FLASH_DATA_ADDRESS /* Audio file address */
/* Private typedef -----------------------------------------------------------*/
typedef enum {
AUDIO_STATE_IDLE = 0,
AUDIO_STATE_INIT,
AUDIO_STATE_PLAYING,
}AUDIO_PLAYBACK_StateTypeDef;
typedef enum {
AUDIO_ERROR_NONE = 0,
AUDIO_ERROR_NOTREADY,
AUDIO_ERROR_IO,
AUDIO_ERROR_EOF,
}AUDIO_ErrorTypeDef;
typedef enum {
BUFFER_OFFSET_NONE = 0,
BUFFER_OFFSET_HALF,
BUFFER_OFFSET_FULL,
}BUFFER_StateTypeDef;
typedef struct {
uint8_t buff[AUDIO_BUFFER_SIZE];
uint32_t fptr;
BUFFER_StateTypeDef state;
}AUDIO_BufferTypeDef;
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static AUDIO_BufferTypeDef buffer_ctl;
static AUDIO_PLAYBACK_StateTypeDef audio_state;
__IO uint32_t uwVolume = 20;
__IO uint32_t uwPauseEnabledStatus = 0;
static uint32_t AudioFreq[9] = {8000 ,11025, 16000, 22050, 32000, 44100, 48000, 96000, 192000};
static JOYState_TypeDef JoyState = JOY_NONE;
/* Private function prototypes -----------------------------------------------*/
static void Audio_SetHint(void);
static uint32_t GetData(void *pdata, uint32_t offset, uint8_t *pbuf, uint32_t NbrOfData);
AUDIO_ErrorTypeDef AUDIO_Start(void);
/* Private functions ---------------------------------------------------------*/
/**
* @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 Display Audio demo hint
* @param None
* @retval None
*/
static void Audio_SetHint(void)
{
/* Clear the LCD */
BSP_LCD_Clear(LCD_COLOR_WHITE);
/* Set Audio Demo description */
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_FillRect(0, 0, BSP_LCD_GetXSize(), 90);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_SetBackColor(LCD_COLOR_BLUE);
BSP_LCD_SetFont(&Font24);
BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"AUDIO EXAMPLE", CENTER_MODE);
BSP_LCD_SetFont(&Font12);
BSP_LCD_DisplayStringAt(0, 30, (uint8_t *)"Press User button for next menu ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 45, (uint8_t *)"Use Joystick Up/Down to change Volume ", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 60, (uint8_t *)"Use Joystick Left/Right to change Frequency", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 75, (uint8_t *)"Click on Joystick for Pause/Resume ", CENTER_MODE);
/* Set the LCD Text Color */
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_DrawRect(10, 100, BSP_LCD_GetXSize() - 20, BSP_LCD_GetYSize()- 110);
BSP_LCD_DrawRect(11, 101, BSP_LCD_GetXSize() - 22, BSP_LCD_GetYSize()- 112);
}
/**
* @brief Starts Audio streaming.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Start(void)
{
uint32_t bytesread;
buffer_ctl.state = BUFFER_OFFSET_NONE;
bytesread = GetData( (void *)AUDIO_FILE_ADDRESS,
0,
&buffer_ctl.buff[0],
AUDIO_BUFFER_SIZE);
if(bytesread > 0)
{
BSP_AUDIO_OUT_Play((uint16_t*)&buffer_ctl.buff[0], AUDIO_BUFFER_SIZE);
audio_state = AUDIO_STATE_PLAYING;
buffer_ctl.fptr = bytesread;
return AUDIO_ERROR_NONE;
}
return AUDIO_ERROR_IO;
}
/**
* @brief Manages Audio process.
* @param None
* @retval Audio error
*/
uint8_t AUDIO_Process(void)
{
uint32_t bytesread;
AUDIO_ErrorTypeDef error_state = AUDIO_ERROR_NONE;
switch(audio_state)
{
case AUDIO_STATE_PLAYING:
if(buffer_ctl.fptr >= AUDIO_FILE_SIZE)
{
/* Play audio sample again ... */
buffer_ctl.fptr = 0;
error_state = AUDIO_ERROR_EOF;
}
/* 1st half buffer played; so fill it and continue playing from bottom*/
if(buffer_ctl.state == BUFFER_OFFSET_HALF)
{
bytesread = GetData((void *)AUDIO_FILE_ADDRESS,
buffer_ctl.fptr,
&buffer_ctl.buff[0],
AUDIO_BUFFER_SIZE /2);
if( bytesread >0)
{
buffer_ctl.state = BUFFER_OFFSET_NONE;
buffer_ctl.fptr += bytesread;
}
}
/* 2nd half buffer played; so fill it and continue playing from top */
if(buffer_ctl.state == BUFFER_OFFSET_FULL)
{
bytesread = GetData((void *)AUDIO_FILE_ADDRESS,
buffer_ctl.fptr,
&buffer_ctl.buff[AUDIO_BUFFER_SIZE /2],
AUDIO_BUFFER_SIZE /2);
if( bytesread > 0)
{
buffer_ctl.state = BUFFER_OFFSET_NONE;
buffer_ctl.fptr += bytesread;
}
}
break;
default:
error_state = AUDIO_ERROR_NOTREADY;
break;
}
return (uint8_t) error_state;
}
/**
* @brief Gets Data from storage unit.
* @param None
* @retval None
*/
static uint32_t GetData(void *pdata, uint32_t offset, uint8_t *pbuf, uint32_t NbrOfData)
{
uint8_t *lptr = pdata;
uint32_t ReadDataNbr;
ReadDataNbr = 0;
while(((offset + ReadDataNbr) < AUDIO_FILE_SIZE) && (ReadDataNbr < NbrOfData))
{
pbuf[ReadDataNbr]= lptr [offset + ReadDataNbr];
ReadDataNbr++;
}
return ReadDataNbr;
}
/*------------------------------------------------------------------------------
Callbacks implementation:
the callbacks API are defined __weak in the stm32469i_eval_audio.c file
and their implementation should be done the user code if they are needed.
Below some examples of callback implementations.
----------------------------------------------------------------------------*/
/**
* @brief Manages the full Transfer complete event.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
if(audio_state == AUDIO_STATE_PLAYING)
{
/* allows AUDIO_Process() to refill 2nd part of the buffer */
buffer_ctl.state = BUFFER_OFFSET_FULL;
}
}
/**
* @brief Manages the DMA Half Transfer complete event.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_HalfTransfer_CallBack(void)
{
if(audio_state == AUDIO_STATE_PLAYING)
{
/* allows AUDIO_Process() to refill 1st part of the buffer */
buffer_ctl.state = BUFFER_OFFSET_HALF;
}
}
/**
* @brief Manages the DMA FIFO error event.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_Error_CallBack(void)
{
/* Display message on the LCD screen */
BSP_LCD_SetBackColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, LINE(14), (uint8_t *)" DMA ERROR ", CENTER_MODE);
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
/* Stop the program with an infinite loop */
while (BSP_PB_GetState(BUTTON_KEY) != RESET)
{ return;}
/* could also generate a system reset to recover from the error */
/* .... */
}
/**
* @}
*/
/**
* @}
*/
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