Oscarkai9139 / Fat-FileSystem-STM32F4-FreeRTOS

Embedded OS Lab5 Fat File System

tags: Embedded OS

StudentID: N26095025

Lab5 Descriptions

In this lab, we added a micro SD card module to implement a fat file system on FreeRTOS.

Development Toolkits

• Board: STM32F407VG
• IDE: STM32CubeIDE 1.5.1
• micro USB adaptor
• 16GB micro SD card
• TTL to USB adaptor

Directory Hierachy

Core/
    +-- Inc/
    |   +-- main.h
    |   +-- AUDIO.h
    |   +-- AUDIO_LINK.h
    |   +-- File_Handling.h
    |   +-- cs43l22.h
    |   +-- diskio.h
    |   +-- fatfs.h
    |   +-- ff.h
    |   +-- ff_gen_drv.h
    |   +-- ffconf.h
    |   +-- fops.h
    |   +-- integer.h
    |   +-- main.h
    |   +-- mmc_sd.h
    |   +-- printf.h
    |   +-- stm32f4xx_hal_conf.h
    |   +-- stm32f4xx_it.h
    |   +-- user_diskio.h
    |   +-- waveplayer.h
    +-- Src/
        +-- main.c
        +-- AUDIO.c
        +-- AUDIO_LINK.c
        +-- File_Handling.c
        +-- cs43l22.c
        +-- diskio.c
        +-- fatfs.c
        +-- ff.c
        +-- ff_gen_drv.c
        +-- fops.c
        +-- main.c
        +-- mmc_sd.c
        +-- user_diskio.c
        ++-- waveplayer.c


FreeRTOS/
    +-- inlcude/*
    +-- portable/
    |   +-- ARM_CM4F/
    |   |   +-- port.c
    |   |   +-- portmacro.h
    |   +-- MemMang/
    |       +-- heap_2.c
    +-- croutine.c
    +-- event_groups.c
    +-- list.c
    +-- queue.c
    +-- stream_buffer.c
    +-- tasks.c
    +-- timers.c
    +-- readme.txt

• Make sure your workspace has these files in correct path
  • FreeRTOS/ is cloned from https://github.com/FreeRTOS/FreeRTOS
    • Add library path /FreeRTOS/include, /FreeRTOS/portable/ARM_CM4F
    • Remmemver to change MemMang/ from heap_4.c to heap_2.c

Configurations

1. In file FreeRTOSConfig.h:
   • Change #ifdef __ICCARM__ to

   •   #if defined(__ICCARM__) || defined(__CC_ARM) || defined(__GNUC__)
     

   • Set these defines to 0

   •   #define configUSE_IDLE_HOOK            0
       #define configUSE_TICK_HOOK            0
       #define configUSE_MALLOC_FAILED_HOOK   0
       #define configCHECK_FOR_STACK_OVERFLOW 0
       //for Lab4
       #define configTOTAL_HEAP_SIZE          ((size_t)(5*1024))
       #define configUSE_TIMERS               0

2. In file stm32f4xx_it.c and stm32f4xx_it.h:
   • comment these related functions which will conflict with FreeRTOS's implementations
     • PendSV_Handler
     • SVC_Handler
     • SysTick_Handler

Source Codes Explanations

part 1

• Use a semaphore in both task to ensure both of them dont use the file descriptor at the same time.

void Task1(void *pvParameters) {
  uint8_t count=0;
  for (;;) {
	if (xSemaphore != NULL){
	  FIL test;

	  if ( xSemaphoreTake(xSemaphore, portMAX_DELAY ) == pdTRUE)
	  {
	    if (f_open(&test, "TEST.TXT", FA_WRITE) != 0) printf("open file err in task1\r\n");
	    else printf("file open ok in task1\r\n");

		char buff[13];
		memset(buff, 0, 13);
		if(count%2) sprintf(buff, "%s", "DataWriteT");
		else sprintf(buff, "%s", "DataWriteF");

		UINT byteswrite;
		f_write(&test, buff, 12, &byteswrite);
		f_close(&test);
		count++;

		xSemaphoreGive( xSemaphore );
	  }

    }// if (xSemasphore != NULL)
    vTaskDelay(1);
  }
}

void Task2(void *pvParameters) {
  for (;;) {
    if (xSemaphore != NULL) {

      FIL test_1;

      if ( xSemaphoreTake(xSemaphore, portMAX_DELAY ) == pdTRUE)
      {
	    if (f_open(&test_1, "TEST.TXT", FA_READ) != 0) printf("open file err in task2\r\n");
	    else printf("file open ok in task2\r\n");

	    char buff[11];
		memset(buff, 0, 11);
		UINT bytesread;
		f_read(&test_1, buff, 11, &bytesread);
		printf("data read is %s in task 2\r\n", buff);
		f_close(&test_1);

		xSemaphoreGive( xSemaphore );
	  }

    }//if xSemasphore != NULL
    vTaskDelay(1);
  }
}

part 2

• Use AUDIO_PLAYER_Start to start the waveplayer
• check the AudioState at the end of while loop, when it is AUDIO_STATE_STOP quit the process AUDIO_PLAYER_Process.

void Task3(void *pvParameters) {

	TickType_t last_time;
	const TickType_t inv = 5000/ portTICK_PERIOD_MS;
	last_time = xTaskGetTickCount();
	//PlayInit();
	for (;;) {
		AUDIO_PLAYER_Start(0);
		while(!isFinished){
			AUDIO_PLAYER_Process(true);

			if(xTaskGetTickCount() - last_time >= inv){
				AudioState = AUDIO_STATE_NEXT;
				last_time = xTaskGetTickCount();
			}

			if(AudioState == AUDIO_STATE_STOP){
				isFinished =1;
			}
		}
	}

}

Results

• https://youtu.be/pfL6iA7a4lA