Previously I use FAT and store samples immediately in each sample in txt file. in this method I
don't lost any data but because of reason that you say f_write function change my sample rate. I tried to do that with DMA but it was unsuccessful. I think DMA can help me, but DMA with FAT is not working for me. I attached my code to more information.
uint8_t MIC_Voice_Store[200000];
long int MIC_Store_Counter=0;
int MIC_flag=0;
char Name_buffer[30];
int MIC_File_Counter=0;
char buf[4];
char try[4];
int savecounter=0;
extern char SDPath[4];
extern FATFS SDFatFS;
extern FIL SDFile;
UINT myBytes;
FRESULT result;
sprintf(Name_buffer,"MIC_%d.TXT",MIC_File_Counter);
result=f_mount(&SDFatFS,SDPath,1);
while (1)
{
if(MIC_Ready==1)
{
HAL_TIM_Base_Start_IT(&htim1);
if(MIC_flag==1)
{
if(f_open(&SDFile,Name_buffer, FA_WRITE | FA_OPEN_APPEND) == FR_OK)
{
for (savecounter=0; savecounter<100000; savecounter++)
{
buf[0]=((MIC_Voice_Store[savecounter]/100)%10)+48;
buf[1]=((MIC_Voice_Store[savecounter]/10)%10)+48;
buf[2]=(MIC_Voice_Store[savecounter]%10)+48;
result=f_lseek(&SDFile,f_size(&SDFile));
result=f_write(&SDFile,buf,sizeof(buf),&myBytes);
}
result=f_close(&SDFile);
}
MIC_File_Counter++;
MIC_flag=0;
MIC_Store_Counter=0;
}
MIC_Ready=0;
}
}
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM1)
{
if(MIC_Ready==0)
{
HAL_ADC_Start(&hadc2);
MIC_Voice=HAL_ADC_GetValue(&hadc2);
if(MIC_Store_Counter<100000)
{
MIC_Voice_Store[MIC_Store_Counter]=MIC_Voice;
MIC_Store_Counter++;
}
else
{
MIC_flag=1;
}
MIC_Ready=1;
}
}
}
