Guidance Needed for USB Implementation with FreeRTOS on STM32F756ZG

[dharanik_1399]

#include "main.h"
#include "fatfs.h"
#include "usart.h"
#include "usb_host.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "ff_gen_drv.h"
#include "usb_host.h"
#include "usbh_diskio.h"
#include <stdint.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
#define USE_USB_FS  // Uncomment for Full-Speed USB
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
FATFS USBDISKFatFs;           /* File system object for USB disk logical drive */
FIL MyFile;                   /* File object */
char USBDISKPath[4];          /* USB Host logical drive path */
USBH_HandleTypeDef hUsbHostFS; /* USB Host handle */
uint64_t count=0;
uint8_t operationCount = 0;  /* Track the number of iterations */
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_NVIC_Init(void);
void MX_USB_HOST_Process(void);

/* USER CODE BEGIN PFP */
void USB_POWER_SWITCH_ON(void);
void USB_POWER_SWITCH_OFF(void);
void USBH_UserProcess(USBH_HandleTypeDef *phost, uint8_t id);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USB Power Control Functions */
void USB_POWER_SWITCH_ON(void)
{
    HAL_GPIO_WritePin(GPIOG, GPIO_PIN_6, GPIO_PIN_SET); // Example pin for VBUS control
    printf("VBUS Enabled\n");
}

void USB_POWER_SWITCH_OFF(void)
{
    HAL_GPIO_WritePin(GPIOG, GPIO_PIN_6, GPIO_PIN_RESET); // Turn off VBUS power
    printf("VBUS Disabled\n");
}





void USBH_UserProcess(USBH_HandleTypeDef *phost, uint8_t id);

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART3_UART_Init();
  MX_FATFS_Init();
  MX_USB_HOST_Init();

  /* Initialize interrupts */
  MX_NVIC_Init();
  /* USER CODE BEGIN 2 */
  /* Power on USB VBUS */
          USB_POWER_SWITCH_ON();
    //      HAL_Delay(200); // Short delay for power stabilization

          printf("System Initialized\n");

          /* Initialize USB Host */
              USBH_Init(&hUsbHostFS, USBH_UserProcess, 0);
              USBH_RegisterClass(&hUsbHostFS, USBH_MSC_CLASS);
              USBH_Start(&hUsbHostFS);

              printf("Logical Drive Path: %s\n", USBDISKPath);
              /* Mount the filesystem */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
    MX_USB_HOST_Process();

    /* USER CODE BEGIN 3 */
    count++;
        if (f_mount(&USBDISKFatFs, USBDISKPath, 0) == FR_OK)
           {
        	printf("File System Mounted Successfully\n");

        	/* Create and write to a file */
        	if (f_open(&MyFile, "SABARI.txt", FA_OPEN_APPEND | FA_WRITE) == FR_OK)
        	{
        		const char *data = "HI";
        		UINT bytesWritten;
        		printf("File Opened for Writing\n");
        		if (f_write(&MyFile, data, strlen(data), &bytesWritten) == FR_OK && bytesWritten == strlen(data))
        		{
        			printf("File Written Successfully\n");
        		}
        		else
        		{
        			printf("Failed to Write to File\n");
        		}
        		f_close(&MyFile);
        	}
        else
        {
        	printf("Failed to Open File for Writing\n");
        }

        	/* Read from the file */
        	if (f_open(&MyFile, "SABARI.txt", FA_READ) == FR_OK)
        	{
        		char buffer[64];
        		UINT bytesRead;
        		printf("File Opened for Reading\n");
        		if (f_read(&MyFile, buffer, sizeof(buffer) - 1, &bytesRead) == FR_OK)
        		{
        			buffer[bytesRead] = '\0'; // Null-terminate string
        			printf("File Content: %s\n", buffer);
        		}
        		else
        		{
        			printf("Failed to Read from File\n");
        		}
          f_close(&MyFile);
        	}
        	else
        	{
        		printf("Failed to Open File for Reading\n");
            }

    /* Unmount the filesystem */
        f_mount(NULL, USBDISKPath, 0);
        printf("File System Unmounted\n");
        }
    else
   {
    printf("Failed to Mount File System\n");
   }


  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure LSE Drive Capability
  */
  HAL_PWR_EnableBkUpAccess();

  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 72;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 3;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief NVIC Configuration.
  * @retval None
  */
static void MX_NVIC_Init(void)
{
  /* OTG_FS_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(OTG_FS_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(OTG_FS_IRQn);
}

Hi,


Board- STM32F756ZG , F7 series.

I have successfully implemented USB functionality (mounting, opening, writing to, and unmounting) on an STM32F756ZG microcontroller using the HAL library in a bare-metal environment. However, I am facing difficulties with USB read and write operations when transitioning to a FreeRTOS-based setup.

I would appreciate any guidance or example code on how to correctly implement USB operations (mount, open, write, and unmount) using FreeRTOS, ensuring that the functionality matches my previous bare-metal implementation while utilizing the RTOS for task management. Any assistance would be highly valuable.

[FBL]

Hi @dharanik_1399 

I suggest you start a new project with CubeMX generated code. Enable FreeRTOS™. Configure a USB device. I can share with you an example application CDC with FreeRTOS™ on F4 if you think it might help you.