matlab pdm转pcm_关于PDM转PCM数据存入内部flash问题

void WaveRecorder_kaishi(void)

{

WaveRecorderInit(32000,16, 1); //录音初始化   32KHZ  16位数据  单通道

WaveCounter = 0;

LED_Toggle = 7;

num_shu=0;

STMFLASH_CACHU(); //整片擦除的是地址0x0802 0000 - 0x0803 FFFF 和 0x0804 0000 - 0x0805 FFFF  两个扇区

/* Start the record 开始录音*/

WaveRecorderStart(RecBuf, PCM_OUT_SIZE);

/* Reset the time base variable重置时间基变量 */

Time_Rec_Base = 0;

Switch = 0;

while(1)

{

/* Wait for the recording time 等待录音时间 */

if (num_shu*32 < 262144)

{

/* Wait for the data to be ready with PCM form 等待数据以PCM的形式准备好*/

while(Data_Status == 0);

Data_Status =0;

LED_Toggle = 3;

if (Switch ==1)

{

pAudioRecBuf = RecBuf;

writebuffer = RecBuf1;

WaveCounter += 32;

Switch = 0;

}

else

{

pAudioRecBuf = RecBuf1;

writebuffer = RecBuf;

WaveCounter += 32;

Switch = 1;

}

for (counter=0; counter<16; counter++)

{

LED_Toggle = 3;

if (buf_idx< RAM_BUFFER_SIZE)

{

/* Store Data in RAM buffer */

RAM_Buf[buf_idx++]= *(writebuffer + counter);

if (buf_idx1 == RAM_BUFFER_SIZE)

{

buf_idx1 = 0;

/* Write the stored data in the RAm to the USB Key 将存储的数据写入到USB密匙中 */

STMFLASH_Write(0x08020000+(num_shu*32),(uint32_t*)RAM_Buf1,RAM_BUFFER_SIZE/2);

}

}

else if (buf_idx1< RAM_BUFFER_SIZE)

{

/* Store Data in RAM buffer 在RAM缓冲器中存储数据 */

RAM_Buf1[buf_idx1++]= *(writebuffer + counter);

if (buf_idx == RAM_BUFFER_SIZE)

{

buf_idx = 0;

/* Write the stored data in the RAM to the USB Key */

STMFLASH_Write(0x08020000+(num_shu*32),(uint32_t*)RAM_Buf,RAM_BUFFER_SIZE/2);

}

}

}

}

else /* End of Recording time 记录结束时间  */

{

WaveRecorderStop();

LED_Toggle = 4;

luyin = 2;

Data_Status =0;

AUDIO_SZE=262144;

break;

}

}

void AUDIO_REC_SPI_IRQHANDLER(void)

{

u16 volume;

u16 app;

/* Check if data are available in SPI Data register 检查SPI数据寄存器中的数据是否可用 */

if (SPI_GetITStatus(SPI2, SPI_I2S_IT_RXNE) != RESET)

{

app = SPI_I2S_ReceiveData(SPI2);

InternalBuffer[InternalBufferSize++] = HTONS(app);

/* Check to prevent overflow condition 检查防止溢出条件 */

if (InternalBufferSize >= INTERNAL_BUFF_SIZE)

{

InternalBufferSize = 0;

volume = 50;

PDM_Filter_64_LSB((uint8_t *)InternalBuffer, (uint16_t *)pAudioRecBuf, volume , (PDMFilter_InitStruct *)&Filter);

Data_Status = 1;    //代表PDM转PCM转换完毕

num_shu++;

}

}

}