STM32F7 USB HID Descriptor dosyası

[Mucit23]

Selamlar, STM32F7'de usb hid üzerine bir çalışma yapmak istiyorum. Örnekler içerisinde USB_HID_Standalone adında bir proje var. Karta yükleyip bu yazılımı denedim. Windows STM32F7'yi usb mouse gibi algılıyor. Ona göre imleci kontrol ettiriyor.

Ben USB Mouse olmasını istemiyorum. Normal olarak USB HID aygıtı olarak haberleşme yapmak istiyorum.
Orjinalde USB Descriptor dosyası bu şekilde

usb_desc.c

/**
  ******************************************************************************
  * @file    USB_Device/HID_Standalone/Src/usbd_desc.c
  * @author  MCD Application Team
  * @version V1.0.1
  * @date    21-September-2015
  * @brief   This file provides the USBD descriptors and string formatting method.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "usbd_core.h"
#include "usbd_desc.h"
#include "usbd_conf.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USBD_VID                      0x0483
#define USBD_PID                      0x5710
#define USBD_LANGID_STRING            0x409
#define USBD_MANUFACTURER_STRING      "STMicroelectronics"
#define USBD_PRODUCT_HS_STRING        "HID Joystick in HS Mode"
#define USBD_PRODUCT_FS_STRING        "HID Joystick in FS Mode"
#define USBD_CONFIGURATION_HS_STRING  "HID Config"
#define USBD_INTERFACE_HS_STRING      "HID Interface"
#define USBD_CONFIGURATION_FS_STRING  "HID Config"
#define USBD_INTERFACE_FS_STRING      "HID Interface"

/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ManufacturerStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ProductStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
#ifdef USB_SUPPORT_USER_STRING_DESC
uint8_t *USBD_HID_USRStringDesc (USBD_SpeedTypeDef speed, uint8_t idx, uint16_t *length);  
#endif /* USB_SUPPORT_USER_STRING_DESC */  

/* Private variables ---------------------------------------------------------*/
USBD_DescriptorsTypeDef HID_Desc = {
  USBD_HID_DeviceDescriptor,
  USBD_HID_LangIDStrDescriptor, 
  USBD_HID_ManufacturerStrDescriptor,
  USBD_HID_ProductStrDescriptor,
  USBD_HID_SerialStrDescriptor,
  USBD_HID_ConfigStrDescriptor,
  USBD_HID_InterfaceStrDescriptor,
};

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN   uint8_t USBD_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END = {
  0x12,                       /* bLength */
  USB_DESC_TYPE_DEVICE,       /* bDescriptorType */
  0x00,                       /* bcdUSB */
  0x02,
  0x00,                       /* bDeviceClass */
  0x00,                       /* bDeviceSubClass */
  0x00,                       /* bDeviceProtocol */
  USB_MAX_EP0_SIZE,           /* bMaxPacketSize */
  LOBYTE(USBD_VID),           /* idVendor */
  HIBYTE(USBD_VID),           /* idVendor */
  LOBYTE(USBD_PID),           /* idVendor */
  HIBYTE(USBD_PID),           /* idVendor */
  0x00,                       /* bcdDevice rel. 2.00 */
  0x02,
  USBD_IDX_MFC_STR,           /* Index of manufacturer string */
  USBD_IDX_PRODUCT_STR,       /* Index of product string */
  USBD_IDX_SERIAL_STR,        /* Index of serial number string */
  USBD_MAX_NUM_CONFIGURATION  /* bNumConfigurations */
}; /* USB_DeviceDescriptor */

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN   uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END = {
  USB_LEN_LANGID_STR_DESC,         
  USB_DESC_TYPE_STRING,       
  LOBYTE(USBD_LANGID_STRING),
  HIBYTE(USBD_LANGID_STRING), 
};

uint8_t USBD_StringSerial[USB_SIZ_STRING_SERIAL] =
{
  USB_SIZ_STRING_SERIAL,      
  USB_DESC_TYPE_STRING,    
};

#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;

/* Private functions ---------------------------------------------------------*/
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len);
static void Get_SerialNum(void);

/**
  * @brief  Returns the device descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_DeviceDesc);
  return (uint8_t*)USBD_DeviceDesc;
}

/**
  * @brief  Returns the LangID string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_LangIDDesc);  
  return (uint8_t*)USBD_LangIDDesc;
}

/**
  * @brief  Returns the product string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {   
    USBD_GetString((uint8_t *)USBD_PRODUCT_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)USBD_PRODUCT_FS_STRING, USBD_StrDesc, length);    
  }
  return USBD_StrDesc;
}

/**
  * @brief  Returns the manufacturer string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  USBD_GetString((uint8_t *)USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
  return USBD_StrDesc;
}

/**
  * @brief  Returns the serial number string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = USB_SIZ_STRING_SERIAL;
  
  /* Update the serial number string descriptor with the data from the unique ID*/
  Get_SerialNum();
  
  return (uint8_t*)USBD_StringSerial;
}

/**
  * @brief  Returns the configuration string descriptor.    
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {
    USBD_GetString((uint8_t *)USBD_CONFIGURATION_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)USBD_CONFIGURATION_FS_STRING, USBD_StrDesc, length); 
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Returns the interface string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {
    USBD_GetString((uint8_t *)USBD_INTERFACE_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)USBD_INTERFACE_FS_STRING, USBD_StrDesc, length);
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Create the serial number string descriptor 
  * @param  None 
  * @retval None
  */
static void Get_SerialNum(void)
{
  uint32_t deviceserial0, deviceserial1, deviceserial2;
  
  deviceserial0 = *(uint32_t*)DEVICE_ID1;
  deviceserial1 = *(uint32_t*)DEVICE_ID2;
  deviceserial2 = *(uint32_t*)DEVICE_ID3;
  
  deviceserial0 += deviceserial2;
  
  if (deviceserial0 != 0)
  {
    IntToUnicode (deviceserial0, &USBD_StringSerial[2] ,8);
    IntToUnicode (deviceserial1, &USBD_StringSerial[18] ,4);
  }
}

/**
  * @brief  Convert Hex 32Bits value into char 
  * @param  value: value to convert
  * @param  pbuf: pointer to the buffer 
  * @param  len: buffer length
  * @retval None
  */
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len)
{
  uint8_t idx = 0;
  
  for( idx = 0 ; idx < len ; idx ++)
  {
    if( ((value >> 28)) < 0xA )
    {
      pbuf[ 2* idx] = (value >> 28) + '0';
    }
    else
    {
      pbuf[2* idx] = (value >> 28) + 'A' - 10; 
    }
    
    value = value << 4;
    
    pbuf[ 2* idx + 1] = 0;
  }
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

Ben cihazın mouse değilde sadece usb hid device olarak algılanması için ne yapmam lazım onu bilmiyorum? Sadece descriptor dosyasında değişiklik yapmak yeterlimidir? Windows bağlanan hid aygıtın mouse olduğuna nasıl karar veriyor?

[t2]

yeterli olmayabilir.  Çünkü mouse sadece veri gönderir veri alamaz. veri alabilmesi için başka endpoint  eklenmesi gerek. bu da  max endpoint number gibi bir sayının değişimi ile olur. yani usbd_desc.c dosyası ve başka 1-2 dosya daha değişmesi gerek.

Fakat usbd_desc.c dosyayı değiştirmek riskli. komple bozulur. Mouse Class yerine Custom class eklemek kolay iş değiş.  muhtemelen kendiniz yapamazsınız.   bunun yerine hazır yapılmış genel amaçlı HID aygıt için usbd_desc.c dosyası bularak kullanmanızı öneririm. başka işlemcilere ait  dosyayı da uyarlayabilirsiniz. üretici firma bu projeyi zaten yapmış ve yayınlamış olması gerek. belki de kullanıcı forumlarında vardır. biri paylaşmıştır.

[Mucit23]

Aslında bir örnek buldum. STM32F756_EVAL için USB_Device Custom HID örneği var. usb_desc.c dosyası hemen hemen aynı ama bunun yanında birde usbd_customhid_if.c dosyası var

/**
  ******************************************************************************
  * @file    USB_Device/CustomHID_Standalone/Src/usbd_customhid_if.c
  * @author  MCD Application Team
  * @version V1.0.2
  * @date    21-September-2015
  * @brief   USB Device Custom HID interface file.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "usbd_customhid_if.h"
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static int8_t CustomHID_Init(void);
static int8_t CustomHID_DeInit(void);
static int8_t CustomHID_OutEvent(uint8_t event_idx, uint8_t state);

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef  AdcHandle;
uint32_t ADCConvertedValue = 0;
uint32_t ADC_Prev_ConvertedValue = 0;
uint8_t SendBuffer[2];
extern USBD_HandleTypeDef USBD_Device;

__ALIGN_BEGIN static uint8_t CustomHID_ReportDesc[USBD_CUSTOM_HID_REPORT_DESC_SIZE] __ALIGN_END =
{
  0x06, 0xFF, 0x00,      /* USAGE_PAGE (Vendor Page: 0xFF00) */                       
  0x09, 0x01,            /* USAGE (Demo Kit)               */    
  0xa1, 0x01,            /* COLLECTION (Application)       */            
  /* 6 */
  
  /* LED1 */        
  0x85, LED1_REPORT_ID,  /*     REPORT_ID (1)		     */
  0x09, 0x01,            /*     USAGE (LED 1)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED1_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED1_REPORT_ID,  /*     REPORT_ID (1)              */
  0x09, 0x01,            /*     USAGE (LED 1)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 26 */
  
  /* LED2 */
  0x85, LED2_REPORT_ID,  /*     REPORT_ID 2		     */
  0x09, 0x02,            /*     USAGE (LED 2)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED2_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED2_REPORT_ID,  /*     REPORT_ID (2)              */
  0x09, 0x02,            /*     USAGE (LED 2)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 46 */
  
  /* LED3 */        
  0x85, LED3_REPORT_ID,  /*     REPORT_ID (3)		     */
  0x09, 0x03,            /*     USAGE (LED 3)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED3_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED3_REPORT_ID,  /*     REPORT_ID (3)              */
  0x09, 0x03,            /*     USAGE (LED 3)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 66 */
  
  /* LED4 */
  0x85, LED4_REPORT_ID,  /*     REPORT_ID 4)		     */
  0x09, 0x04,            /*     USAGE (LED 4)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED4_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED4_REPORT_ID,  /*     REPORT_ID (4)              */
  0x09, 0x04,            /*     USAGE (LED 4)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 86 */
  
  /* key Push Button */  
  0x85, KEY_REPORT_ID,   /*     REPORT_ID (5)              */
  0x09, 0x05,            /*     USAGE (Push Button)        */      
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */      
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */      
  0x75, 0x01,            /*     REPORT_SIZE (1)            */  
  0x81, 0x82,            /*     INPUT (Data,Var,Abs,Vol)   */   
  
  0x09, 0x05,            /*     USAGE (Push Button)        */               
  0x75, 0x01,            /*     REPORT_SIZE (1)            */           
  0xb1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */  
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0x81, 0x83,            /*     INPUT (Cnst,Var,Abs,Vol)   */                    
  0x85, KEY_REPORT_ID,   /*     REPORT_ID (2)              */         
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0xb1, 0x83,            /*     FEATURE (Cnst,Var,Abs,Vol) */                      
  /* 114 */
  
  /* Tamper Push Button */  
  0x85, TAMPER_REPORT_ID,/*     REPORT_ID (6)              */
  0x09, 0x06,            /*     USAGE (Tamper Push Button) */      
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */      
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */      
  0x75, 0x01,            /*     REPORT_SIZE (1)            */  
  0x81, 0x82,            /*     INPUT (Data,Var,Abs,Vol)   */   
  
  0x09, 0x06,            /*     USAGE (Tamper Push Button) */               
  0x75, 0x01,            /*     REPORT_SIZE (1)            */           
  0xb1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */  
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0x81, 0x83,            /*     INPUT (Cnst,Var,Abs,Vol)   */                    
  0x85, TAMPER_REPORT_ID,/*     REPORT_ID (6)              */         
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0xb1, 0x83,            /*     FEATURE (Cnst,Var,Abs,Vol) */  
  /* 142 */
  
  /* ADC IN */
  0x85, ADC_REPORT_ID,   /*     REPORT_ID                 */         
  0x09, 0x07,            /*     USAGE (ADC IN)             */          
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */               
  0x26, 0xff, 0x00,      /*     LOGICAL_MAXIMUM (255)      */                 
  0x75, 0x08,            /*     REPORT_SIZE (8)            */           
  0x81, 0x82,            /*     INPUT (Data,Var,Abs,Vol)   */                    
  0x85, ADC_REPORT_ID,   /*     REPORT_ID (7)              */                 
  0x09, 0x07,            /*     USAGE (ADC in)             */                     
  0xb1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */                                 
  /* 161 */
  
  0xc0 	                 /*     END_COLLECTION	             */
}; 

USBD_CUSTOM_HID_ItfTypeDef USBD_CustomHID_fops = 
{
  CustomHID_ReportDesc,
  CustomHID_Init,
  CustomHID_DeInit,
  CustomHID_OutEvent,
};

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  CustomHID_Init
  *         Initializes the CUSTOM HID media low layer
  * @param  None
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CustomHID_Init(void)
{
  GPIO_InitTypeDef   GPIO_InitStructure;
  ADC_ChannelConfTypeDef sConfig;

  /* Configure the ADC peripheral */
  AdcHandle.Instance = ADCx;
  
  AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV4;
  AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
  AdcHandle.Init.ScanConvMode = DISABLE;
  AdcHandle.Init.ContinuousConvMode = ENABLE;
  AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  AdcHandle.Init.NbrOfDiscConversion = 0;
  AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
  AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  AdcHandle.Init.NbrOfConversion = 1;
  AdcHandle.Init.DMAContinuousRequests = ENABLE;
  AdcHandle.Init.EOCSelection = DISABLE;
  HAL_ADC_Init(&AdcHandle);
   
  /* Configure ADC regular channel */  
  sConfig.Channel = ADCx_CHANNEL;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
  sConfig.Offset = 0;
  HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);

  /* Start the conversion process and enable interrupt */  
  HAL_ADC_Start_DMA(&AdcHandle, (uint32_t*)&ADCConvertedValue, 1);
  
  /* Configure LED1, LED2, LED3 and LED4 */
  /* BSP_LED_Init(LED1); *//* To use LED1, ensure that JP24 is in position 2-3, potentiometer is then no more usable */
  BSP_LED_Init(LED2);
  BSP_LED_Init(LED3);
  BSP_LED_Init(LED4);
  
  /* Enable GPIOC clock */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  
  /* Configure PC13 pin as input floating */
  GPIO_InitStructure.Mode = GPIO_MODE_IT_RISING_FALLING;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  GPIO_InitStructure.Pin = GPIO_PIN_13;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* Enable and set EXTI15_10 Interrupt to the lowest priority */
  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 3, 0);
  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);
  
  return (0);
}

/**
  * @brief  CustomHID_DeInit
  *         DeInitializes the CUSTOM HID media low layer
  * @param  None
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CustomHID_DeInit(void)
{
  /*
  Add your de-initialization code here 
  */  
  return (0);
}


/**
  * @brief  CustomHID_OutEvent
  *         Manage the CUSTOM HID class Out Event    
  * @param  event_idx: LED Report Number
  * @param  state: LED states (ON/OFF)
  */
static int8_t CustomHID_OutEvent  (uint8_t event_idx, uint8_t state)
{ 
  switch(event_idx)
  {
  case 1: /* LED1 */
    (state == 1) ? BSP_LED_On(LED1) : BSP_LED_Off(LED1); 
    break;
    
  case 2: /* LED2 */
    (state == 1) ? BSP_LED_On(LED2) : BSP_LED_Off(LED2); 
    break;
  case 3: /* LED3 */
    (state == 1) ? BSP_LED_On(LED3) : BSP_LED_Off(LED3); 
    break;
  case 4: /* LED4 */
    (state == 1) ? BSP_LED_On(LED4) : BSP_LED_Off(LED4); 
    break;
    
  default:
    BSP_LED_Off(LED1);
    BSP_LED_Off(LED2);
    BSP_LED_Off(LED3);
    BSP_LED_Off(LED4); 
    break;
  }
  return (0);
}

/**
  * @brief EXTI line detection callbacks
  * @param GPIO_Pin: Specifies the pins connected EXTI line
  * @retval None
  */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == KEY_BUTTON_PIN)
  {
    SendBuffer[0] = KEY_REPORT_ID; 
    
    if(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
    {
      SendBuffer[1] = 0x01;
    }
    else
    {
      SendBuffer[1] = 0x00;
    }
    USBD_CUSTOM_HID_SendReport(&USBD_Device, SendBuffer, 2);
  }
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

Tam olarak ne yapılmaya çalışılmış anlayamadım aslında Ana programda USBD_Start denildikten sonra program boş döngüye giriyor. Ama işin mantığını kavrayabilirsem yukarıdaki örnek işimi görecektir.

[t2]

Ana program boş döngü içinde olsa da periyodik olarak interrupt çalışıyor olabilir.    Usb polling denen işlem yapılması gerek.
Periyodik olarak gelen sorulara cevap vermesi gerek. Buna ilave olarak gönderilecek veri varsa gönderilir. Gelen veri okunur.

Bunları anlamaya çalışmak uzun sürer. hem de gereksiz. aynen kullanmak taraftarıyım. 
Kullanım için  3 tane fonksiyon yeterli. Gönderme, Alma,  Polling fonksiyonlarıdır.


Aşağıdaki gibi gönderme komutu ile 2 bayt gönderiliyor(galiba).
önce SendBuffer isimli diziye baytlar yüklenir.

USBD_CUSTOM_HID_SendReport(&USBD_Device, SendBuffer, 2);

[Mucit23]

Ana Program bu şekilde

/**
  ******************************************************************************
  * @file    USB_Device/CustomHID_Standalone/Src/main.c
  * @author  MCD Application Team
  * @version V1.0.2
  * @date    21-September-2015
  * @brief   USB device CustomHID demo main file
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
USBD_HandleTypeDef USBD_Device;

/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Error_Handler(void);
static void CPU_CACHE_Enable(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* Enable the CPU Cache */
  CPU_CACHE_Enable();
  
  /* STM32F7xx HAL library initialization:
       - Configure the Flash ART accelerator on ITCM interface
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();
  
  /* Configure the System clock to have a frequency of 216 MHz */
  SystemClock_Config();
    
  /* Initialize IO expander */
  BSP_IO_Init();

  /* Init Device Library */
  USBD_Init(&USBD_Device, &HID_Desc, 0);
  
  /* Add Supported Class */
  USBD_RegisterClass(&USBD_Device, &USBD_CUSTOM_HID);
  
  /* Add Custom HID callbacks */
  USBD_CUSTOM_HID_RegisterInterface(&USBD_Device, &USBD_CustomHID_fops);
  
  /* Start Device Process */
  USBD_Start(&USBD_Device);
  
  /* Run Application (Interrupt mode) */
  while (1)
  {
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow :
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 216000000
  *            HCLK(Hz)                       = 216000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 4
  *            APB2 Prescaler                 = 2
  *            HSE Frequency(Hz)              = 25000000
  *            PLL_M                          = 25
  *            PLL_N                          = 432
  *            PLL_P                          = 2
  *            PLLSAI_N                       = 384
  *            PLLSAI_P                       = 8
  *            VDD(V)                         = 3.3
  *            Main regulator output voltage  = Scale1 mode
  *            Flash Latency(WS)              = 7
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
  
  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 25;
  RCC_OscInitStruct.PLL.PLLN = 432;  
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 9;
  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  
  /* Activate the OverDrive to reach the 216 Mhz Frequency */
  if(HAL_PWREx_EnableOverDrive() != HAL_OK)
  {
    Error_Handler();
  }
  
  /* Select PLLSAI output as USB clock source */
  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CLK48;
  PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48SOURCE_PLLSAIP;
  PeriphClkInitStruct.PLLSAI.PLLSAIN = 384;
  PeriphClkInitStruct.PLLSAI.PLLSAIQ = 7; 
  PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV8;
  if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct)  != HAL_OK)
  {
    Error_Handler();
  }
  
  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 
     clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* User may add here some code to deal with this error */
  while(1)
  {
  }
}

/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

Buda Descriptor dosyası

/**
  ******************************************************************************
  * @file    USB_Device/CustomHID_Standalone/Src/usbd_desc.c
  * @author  MCD Application Team
  * @version V1.0.2
  * @date    21-September-2015
  * @brief   This file provides the USBD descriptors and string formating method.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "usbd_core.h"
#include "usbd_desc.h"
#include "usbd_conf.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USBD_VID                      0x0483
#define USBD_PID                      0x5750
#define USBD_LANGID_STRING            0x409
#define USBD_MANUFACTURER_STRING      "STMicroelectronics"
#define USBD_PRODUCT_HS_STRING        "Custome HID in HS Mode"
#define USBD_PRODUCT_FS_STRING        "Custome HID in FS Mode"
#define USBD_CONFIGURATION_HS_STRING  "HID Config"
#define USBD_INTERFACE_HS_STRING      "HID Interface"
#define USBD_CONFIGURATION_FS_STRING  "HID Config"
#define USBD_INTERFACE_FS_STRING      "HID Interface"

/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ManufacturerStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ProductStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
#ifdef USB_SUPPORT_USER_STRING_DESC
uint8_t *USBD_HID_USRStringDesc (USBD_SpeedTypeDef speed, uint8_t idx, uint16_t *length);  
#endif /* USB_SUPPORT_USER_STRING_DESC */  

/* Private variables ---------------------------------------------------------*/
USBD_DescriptorsTypeDef HID_Desc = {
  USBD_HID_DeviceDescriptor,
  USBD_HID_LangIDStrDescriptor, 
  USBD_HID_ManufacturerStrDescriptor,
  USBD_HID_ProductStrDescriptor,
  USBD_HID_SerialStrDescriptor,
  USBD_HID_ConfigStrDescriptor,
  USBD_HID_InterfaceStrDescriptor,
};

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END = {
  0x12,                       /* bLength */
  USB_DESC_TYPE_DEVICE,       /* bDescriptorType */
  0x00,                       /* bcdUSB */
  0x02,
  0x00,                       /* bDeviceClass */
  0x00,                       /* bDeviceSubClass */
  0x00,                       /* bDeviceProtocol */
  USB_MAX_EP0_SIZE,           /* bMaxPacketSize */
  LOBYTE(USBD_VID),           /* idVendor */
  HIBYTE(USBD_VID),           /* idVendor */
  LOBYTE(USBD_PID),           /* idVendor */
  HIBYTE(USBD_PID),           /* idVendor */
  0x00,                       /* bcdDevice rel. 2.00 */
  0x02,
  USBD_IDX_MFC_STR,           /* Index of manufacturer string */
  USBD_IDX_PRODUCT_STR,       /* Index of product string */
  USBD_IDX_SERIAL_STR,        /* Index of serial number string */
  USBD_MAX_NUM_CONFIGURATION  /* bNumConfigurations */
}; /* USB_DeviceDescriptor */

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END = {
  USB_LEN_LANGID_STR_DESC,         
  USB_DESC_TYPE_STRING,       
  LOBYTE(USBD_LANGID_STRING),
  HIBYTE(USBD_LANGID_STRING), 
};

uint8_t USBD_StringSerial[USB_SIZ_STRING_SERIAL] =
{
  USB_SIZ_STRING_SERIAL,      
  USB_DESC_TYPE_STRING,    
};

#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;

/* Private functions ---------------------------------------------------------*/
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len);
static void Get_SerialNum(void);

/**
  * @brief  Returns the device descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_DeviceDesc);
  return (uint8_t*)USBD_DeviceDesc;
}

/**
  * @brief  Returns the LangID string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_LangIDDesc);  
  return (uint8_t*)USBD_LangIDDesc;
}

/**
  * @brief  Returns the product string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {   
    USBD_GetString((uint8_t *)(uint8_t *)USBD_PRODUCT_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_PRODUCT_FS_STRING, USBD_StrDesc, length);    
  }
  return USBD_StrDesc;
}

/**
  * @brief  Returns the manufacturer string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  USBD_GetString((uint8_t *)(uint8_t *)USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
  return USBD_StrDesc;
}

/**
  * @brief  Returns the serial number string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = USB_SIZ_STRING_SERIAL;
  
  /* Update the serial number string descriptor with the data from the unique ID*/
  Get_SerialNum();
  
  return (uint8_t*)USBD_StringSerial;
}

/**
  * @brief  Returns the configuration string descriptor.    
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {  
    USBD_GetString((uint8_t *)(uint8_t *)USBD_CONFIGURATION_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_CONFIGURATION_FS_STRING, USBD_StrDesc, length); 
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Returns the interface string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_INTERFACE_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_INTERFACE_FS_STRING, USBD_StrDesc, length);
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Create the serial number string descriptor 
  * @param  None 
  * @retval None
  */
static void Get_SerialNum(void)
{
  uint32_t deviceserial0, deviceserial1, deviceserial2;
  
  deviceserial0 = *(uint32_t*)DEVICE_ID1;
  deviceserial1 = *(uint32_t*)DEVICE_ID2;
  deviceserial2 = *(uint32_t*)DEVICE_ID3;
  
  deviceserial0 += deviceserial2;
  
  if (deviceserial0 != 0)
  {
    IntToUnicode (deviceserial0, &USBD_StringSerial[2] ,8);
    IntToUnicode (deviceserial1, &USBD_StringSerial[18] ,4);
  }
}

/**
  * @brief  Convert Hex 32Bits value into char 
  * @param  value: value to convert
  * @param  pbuf: pointer to the buffer 
  * @param  len: buffer length
  * @retval None
  */
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len)
{
  uint8_t idx = 0;
  
  for( idx = 0; idx < len; idx ++)
  {
    if( ((value >> 28)) < 0xA )
    {
      pbuf[ 2* idx] = (value >> 28) + '0';
    }
    else
    {
      pbuf[2* idx] = (value >> 28) + 'A' - 10; 
    }
    
    value = value << 4;
    
    pbuf[ 2* idx + 1] = 0;
  }
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

[t2]

Evet tahmin ettiğim gibi interrupt çalışıyor. Açıklamaya da belirtilmiş zaten

interrupt fonksiyonu bulunacak oraya bakılacak. buton basıldıysa led yak gibi  kararlar veriliyor. Hangi soru geldiyse ne cevap verilecek bunlar interrupt fonksiyonu içindedir.

  /* Run Application (Interrupt mode) */
  while (1)
  {
  }

Öncelikle bu projeyi aynen çalıştırıp, sonra adım adım değişiklik yapılabilir.



buton ve LED işleri galiba şurada :

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == KEY_BUTTON_PIN)
  {
    SendBuffer[0] = KEY_REPORT_ID;
   
    if(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
    {
      SendBuffer[1] = 0x01;
    }
    else
    {
      SendBuffer[1] = 0x00;
    }
    USBD_CUSTOM_HID_SendReport(&USBD_Device, SendBuffer, 2);
  }
}

[Mucit23]

Anladım hocam. Ben biraz araştırma yapayım.

Ben aslında usbd_customhid_if.c  fonksiyonunda CustomHID_ReportDesc fonksiyonunu anlamadım. Bu fonksiyonda birçok tanımlama yapılmış. Bunlar nedir?

STM32F7xx_it.c dosyasında OTG_FS_IRQHandler fonksiyonu var fakat usb den hangi data geldiği zaman hangi işlemlerin yapılacağına nerede karar veriliyor? Mesela LED yakmak için aşağıdaki fonksiyon kullanılmış.

static int8_t CustomHID_OutEvent  (uint8_t event_idx, uint8_t state)
{ 
  switch(event_idx)
  {
  case 1: /* LED1 */
    (state == 1) ? BSP_LED_On(LED1) : BSP_LED_Off(LED1); 
    break;
    
  case 2: /* LED2 */
    (state == 1) ? BSP_LED_On(LED2) : BSP_LED_Off(LED2); 
    break;
  case 3: /* LED3 */
    (state == 1) ? BSP_LED_On(LED3) : BSP_LED_Off(LED3); 
    break;
  case 4: /* LED4 */
    (state == 1) ? BSP_LED_On(LED4) : BSP_LED_Off(LED4); 
    break;
    
  default:
    BSP_LED_Off(LED1);
    BSP_LED_Off(LED2);
    BSP_LED_Off(LED3);
    BSP_LED_Off(LED4); 
    break;
  }
  return (0);
}

Bu fonksiyona event gelmesi lazım ama nerden geliyor?