我正在使用 STM32L476G_EVAL 板和 Eclipse（C 语言）。我需要编写一个可以录制声音的程序并将获得的声音样本写入SD卡。我有两个单独的代码，一个用于录制和再现使用 DFSDM HAL API 的声音，另一个用于在 RTOS 模式下将向量写入 SD 卡。我用两个线程制作了一个新的源代码，一个用于录制声音，另一个用于写入 sd 卡。问题是由于某种原因线程不起作用，它在第一次写入 sd 卡后停止。我猜测它与 fatfs 和线程有关，因为我尝试使用 fatfs 和更简单的功能（LED 切换）进行多线程，但它也不起作用。可能我错过了一些信息，因为我是这个领域的新手。
#define SDMMC1 ((SDMMC_TypeDef *) SDMMC1_BASE)
#include "main.h"
#include "main1.h"
#include "main2.h"
#include "cmsis_os.h"
#include "ff.h"
#include "pthread.h"
/** @addtogroup STM32L4xx_HAL_Examples
* @{
*/
/** @addtogroup DFSDM_AudioRecord
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#define SaturaLH(N, L, H) (((N)<(L))?(L):(((N)>(H))?(H):(N)))
#define SizeBuff 2048 //macro variable for the size of the buffers
/* Private variables ---------------------------------------------------------*/
DFSDM_Channel_HandleTypeDef DfsdmLeftChannelHandle;
DFSDM_Channel_HandleTypeDef DfsdmRightChannelHandle;
DFSDM_Filter_HandleTypeDef DfsdmLeftFilterHandle;
DFSDM_Filter_HandleTypeDef DfsdmRightFilterHandle;
DMA_HandleTypeDef hLeftDma;
DMA_HandleTypeDef hRightDma;
SAI_HandleTypeDef SaiHandle;
DMA_HandleTypeDef hSaiDma;
FATFS SDFatFs; /* File system object for SD card logical drive */
FIL MyFile; /* File object */
char SDPath[4]; /* SD card logical drive path */
AUDIO_DrvTypeDef *audio_drv;
int32_t LeftRecBuff[2048];
int32_t RightRecBuff[2048];
int16_t PlayBuff[4096];
uint32_t DmaLeftRecHalfBuffCplt = 0;
uint32_t DmaLeftRecBuffCplt = 0;
uint32_t DmaRightRecHalfBuffCplt = 0;
uint32_t DmaRightRecBuffCplt = 0;
uint32_t PlaybackStarted = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void DFSDM_Init(void);
static void Playback_Init(void);
static void SD_Thread(void const *argument);
static void Audio_Thread(void const *argument);
osThreadId AudioThreadHandle, SDThreadHandle;
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32L4xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to have a frequency of 80 MHz */
SystemClock_Config();
/* Configure LED1 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED3);
/* Initialize DFSDM channels and filter for record */
DFSDM_Init();
/* Initialize playback */
Playback_Init();
/* Start DFSDM conversions */
if(HAL_OK != HAL_DFSDM_FilterRegularStart_DMA(&DfsdmRightFilterHandle, RightRecBuff, SizeBuff))
{
Error_Handler();
}
if(HAL_OK != HAL_DFSDM_FilterRegularStart_DMA(&DfsdmLeftFilterHandle, LeftRecBuff, SizeBuff))
{
Error_Handler();
}
osThreadDef(Audio1, Audio_Thread, osPriorityHigh, 0, configMINIMAL_STACK_SIZE);
/* Thread 2 definition */
osThreadDef(SD1, SD_Thread, osPriorityNormal, 0, configMINIMAL_STACK_SIZE);
/* Start thread 1 */
AudioThreadHandle = osThreadCreate(osThread(Audio1), NULL);
/* Start thread 2 */
SDThreadHandle = osThreadCreate(osThread(SD1), NULL);
/* Start scheduler */
osKernelStart();
for(;;);
}
static void SD_Thread(void const *argument)
{
uint32_t i, byteswritten; // File write/read counts /
BSP_LED_On(LED3);
//##-1- Link the micro SD disk I/O driver ##################################/
if(FATFS_LinkDriver(&SD_Driver, SDPath) == 0)
{
//##-2- Register the file system object to the FatFs module ##############/
if(f_mount(&SDFatFs, (TCHAR const*)SDPath, 0) != FR_OK)
{
// FatFs Initialization Error
Error_Handler();
}
else
{
//##-3- Create a FAT file system (format) on the logical drive #########/
// WARNING: Formatting the uSD card will delete all content on the device /
if(f_mkfs((TCHAR const*)SDPath, 0, 0) != FR_OK)
{
// FatFs Format Error /
Error_Handler();
}
else
{
//##-4- Create and Open a new text file object with write access #####/
if(f_open(&MyFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)
{
// 'STM32.TXT' file Open for write Error /
Error_Handler();
}
else
{
BSP_LED_On(LED1);
//##-5- Write data to the text file ################################/
for(i=0; i<2*SizeBuff; i++ )
f_printf(&MyFile,"%d ", PlayBuff[i]);
f_close(&MyFile);
}
}
}
}
}
static void Audio_Thread(void const *argument)
{
uint32_t i, count;
BSP_LED_On(LED1);
while(1)
{
if((DmaLeftRecHalfBuffCplt == 1) && (DmaRightRecHalfBuffCplt == 1))
{
/* Store values on Play buff */
for(i = 0; i < SizeBuff/2; i++)
{
PlayBuff[2*i] = SaturaLH((LeftRecBuff[i] >> 8), -32768, 32767);
PlayBuff[(2*i)+1] = SaturaLH((RightRecBuff[i] >> 8), -32768, 32767);
}
if(PlaybackStarted == 0)
{
if(0 != audio_drv->Play(AUDIO_I2C_ADDRESS, (uint16_t *) &PlayBuff[0], 4096))
{
Error_Handler();
}
if(HAL_OK != HAL_SAI_Transmit_DMA(&SaiHandle, (uint8_t *) &PlayBuff[0], 4096))
{
Error_Handler();
}
PlaybackStarted = 1;
}
DmaLeftRecHalfBuffCplt = 0;
DmaRightRecHalfBuffCplt = 0;
}
if((DmaLeftRecBuffCplt == 1) && (DmaRightRecBuffCplt == 1))
{
/* Store values on Play buff */
for(i = SizeBuff/2; i < SizeBuff; i++)
{
PlayBuff[2*i] = SaturaLH((LeftRecBuff[i] >> 8), -32768, 32767);
PlayBuff[(2*i)+1] = SaturaLH((RightRecBuff[i] >> 8), -32768, 32767);
}
DmaLeftRecBuffCplt = 0;
DmaRightRecBuffCplt = 0;
osThreadResume(SDThreadHandle);
osThreadSuspend(NULL);
}
}
}