waveplayer.c

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/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : waveplayer.c
* Author             : MCD Application Team
* Version            : V1.1
* Date               : 11/26/2007
* Description        : This file includes the wave player driver for the
*                      STM3210B-EVAL demo.
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
typedef enum
{
  LittleEndian,
  BigEndian
}Endianness;

/* Private define ------------------------------------------------------------*/
#define  ChunkID             0x52494646  /* correspond to the letters 'RIFF' */
#define  FileFormat          0x57415645  /* correspond to the letters 'WAVE' */
#define  FormatID            0x666D7420  /* correspond to the letters 'fmt ' */
#define  DataID              0x64617461  /* correspond to the letters 'data' */
#define  FactID              0x66616374  /* correspond to the letters 'fact' */

#define  WAVE_FORMAT_PCM     0x01
#define  FormatChunkSize     0x10
#define  Channel_Mono        0x01

#define  SampleRate_8000     8000
#define  SampleRate_11025    11025
#define  SampleRate_22050    22050
#define  SampleRate_44100    44100
#define  Bits_Per_Sample_8   8

#define Dummy_Byte 0xA5

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static WAVE_FormatTypeDef WAVE_Format;
static volatile ErrorCode WaveFileStatus = Unvalid_RIFF_ID;
static vu16 TIM2ARRValue = 0x00;
static vu32 WaveDataLength;
static vu32 SpeechDataOffset = 0x00;
static u32 ReadAddr = 0x00, PauseReadAddr = 0x00;

/* Private function prototypes -----------------------------------------------*/
static u32 ReadUnit(u8 NbrOfBytes, Endianness BytesFormat);
static ErrorCode WavePlayer_WaveParsing(u32 ReadAddress);

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : WavePlay_Init
* Description    : Wave player Initialization
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void WavePlayer_Init(void)
{
  /* Peripherals InitStructure define */
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef        TIM_OCInitStructure;
  GPIO_InitTypeDef GPIOB_InitStructure;

  TIM_OCStructInit(&TIM_OCInitStructure);
  
  /* Read the Speech wave file status */
  WaveFileStatus = WavePlayer_WaveParsing(SpeechReadAddr);

  if(WaveFileStatus == Valid_WAVE_File) /* the .WAV file is valid */
  {
    /* Set WaveDataLenght to the Speech wave length */
    WaveDataLength = WAVE_Format.DataSize;
  }

  /* TIM4 and TIM2 configuration is used also for voice recorder application */

  /* Configure PB.08 as alternate function (TIM4_OC3) */
  GPIOB_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIOB_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIOB_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIOB_InitStructure);

  /* TIM4 used for PWM genration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0x00; /* TIM4CLK = 72 MHz */
  TIM_TimeBaseStructure.TIM_Period = 0xFF;   /* PWM frequency : 281.250KHz*/
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
  /* TIM4's Channel3 in PWM1 mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_Channel = TIM_Channel_3;
  TIM_OCInitStructure.TIM_Pulse = 0x7F;  /* Duty cycle: 50%*/  
  TIM_OCInit(TIM4, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);

  /* TIM2 used for timing, the timing period depends on wav file sample rate */
  TIM_TimeBaseStructure.TIM_Prescaler = 0x00;    /* TIM2CLK = 72 MHz */
  TIM_TimeBaseStructure.TIM_Period = TIM2ARRValue;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  /* Output Compare Inactive Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive;
  TIM_OCInitStructure.TIM_Channel = TIM_Channel_1;
  TIM_OCInitStructure.TIM_Pulse = 0x0;
  TIM_OCInit(TIM2, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
}

/*******************************************************************************
* Function Name  : Get_WaveFileStatus
* Description    : Returns the Wave file status.
* Input          : None
* Output         : None
* Return         : Wave file status.
*******************************************************************************/
ErrorCode Get_WaveFileStatus(void)
{
  return (WaveFileStatus);
}

/*******************************************************************************
* Function Name  : WavePlayer_Start
* Description    : Start wave playing
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void WavePlayer_Start(void)
{
  /* Set WaveDataLenght to the Speech wave length */
  WaveDataLength = WAVE_Format.DataSize;
  
  TIM_SetAutoreload(TIM2, TIM2ARRValue);

  /* Start TIM4 */
  TIM_Cmd(TIM4, ENABLE);

  /* Start TIM2 */
  TIM_Cmd(TIM2, ENABLE);

  /* Set SPI Flash start read address to the Speech wave data */
  ReadAddr = SpeechReadAddr + SpeechDataOffset;
}

/*******************************************************************************
* Function Name  : WavePlayer_Stop
* Description    : Stop wave playing
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void WavePlayer_Stop(void)
{
  /* Disable TIM2 update interrupt */
  TIM_ITConfig(TIM2, TIM_IT_Update, DISABLE);
  /* Disable TIM4 */
  TIM_Cmd(TIM4, DISABLE);
  /* Disable TIM2 */
  TIM_Cmd(TIM2, DISABLE);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();
}

/*******************************************************************************
* Function Name  : WavePlayer_RePlay
* Description    : Pause wave playing
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void WavePlayer_RePlay(void)
{
  TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

  /* Enable TIM2 update interrupt */
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

  /* set Speech SPI flash wave address */
  SPI_FLASH_StartReadSequence(PauseReadAddr);
}

/*******************************************************************************
* Function Name  : WavePlayer_Pause
* Description    : Pause wave playing
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void WavePlayer_Pause(void)
{
  TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

  /* Disable TIM2 update interrupt */
  TIM_ITConfig(TIM2, TIM_IT_Update, DISABLE);

  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  PauseReadAddr = WAVE_Format.DataSize - WaveDataLength;
  PauseReadAddr += ReadAddr;