STM32F407 PDM转PCM问题

只看该作者 · 2017-11-22 17:20

rt
我在调试数字麦克风时，接收到的是PDM格式的音频数据，需要转换成PCM。我在调用ST官网上下载的libPDMFilter_Keil.lib库中的PDM_Filter_64_LSB函数时，进入了HardFault_Handler，请问有哪个大神知道是什么原因吗？
代码如下：
#include "sph0644.h"
#include "pdm_filter.h"

#define INTERNEL_BUFF_SIZE    64
#define PCM_OUT_SIZE          16

PDMFilter_InitStruct Filter;

u16 PDM_Output_Buffer[PCM_OUT_SIZE];
u16 *pAudioRecBuf;
u16 InternalBuffer[INTERNEL_BUFF_SIZE];
u16 InternalBufferSize = 0;

static void Sph0644_Config(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(SPI_SCK_GPIO_CLK|SPI_MOSI_GPIO_CLK, ENABLE);//Ê¹ÄÜÍâÉèGPIOB,GPIOCÊ±ÖÓ

GPIO_InitStructure.GPIO_Pin = SPI_SCK_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´ÓÃ¹¦ÄÜ
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍì
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//ÉÏÀ
GPIO_Init(SPI_SCK_GPIO_PORT, &GPIO_InitStructure);//³õÊ¼»¯

GPIO_InitStructure.GPIO_Pin =SPI_MOSI_PIN;
GPIO_Init(SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);//³õÊ¼»¯

GPIO_PinAFConfig(SPI_SCK_GPIO_PORT,SPI_SCK_SOURCE,SPI_SCK_AF); //PB13,AF5  I2S_SCLK
GPIO_PinAFConfig(SPI_MOSI_GPIO_PORT,SPI_MOSI_SOURCE,SPI_MOSI_AF); //PC3 ,AF5  I2S_DACDATA

I2S2_Init(I2S_Standard_LSB,I2S_Mode_MasterRx,I2S_CPOL_High,I2S_DataFormat_16b);
I2S2_SampleRate_Set(32000); //ÉèÖÃ²ÉÑùÂÊ

// Configure the SPI interrupt priority
NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

SPI_I2S_ITConfig(SPI2,SPI_I2S_IT_RXNE,ENABLE);
}

void Sph0644_Init(void)
{
//Enable CRC module/*
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_CRC, ENABLE);

//ÅäÖÃI2S2£¬CLKÆµÂÊ1024MHz
Sph0644_Config();

//16KHz,ÔÚ´ËÖ®Ç°£¬±ØÐë¿ªÆôCRCÊ±ÖÓ£¬·ñÔò½øÈëËÀÑ»·
Filter.LP_HZ = 8000;
Filter.HP_HZ = 10;
Filter.Fs = 16000;
Filter.Out_MicChannels = 1;
Filter.In_MicChannels = 1;

PDM_Filter_Init(&Filter);
}

void Sph0644_Start(void)
{
pAudioRecBuf = PDM_Output_Buffer;
I2S_Cmd(SPI2,ENABLE);
}

void Sph0644_Stop(void)
{
I2S_Cmd(SPI2,DISABLE);
}

void SPI2_IRQHandler(void)
{
u16 app;
u16 volume;

if(SPI_GetITStatus(SPI2,SPI_I2S_IT_RXNE) == SET)
{
      app = SPI_I2S_ReceiveData(SPI2);
      InternalBuffer[InternalBufferSize++] = HTONS(app);

      if(InternalBufferSize >= INTERNEL_BUFF_SIZE)
      {
         InternalBufferSize = 0;
         volume = 50;

         PDM_Filter_64_LSB((u8*)InternalBuffer,pAudioRecBuf,volume,&Filter);
      }
}
}