STM32F4 Discovery USB HID 用到的文件图解

├── STM32_USB_Device_Library                                 USB从设备库
│   │   ├── Class
│   │   │   └── hid
│   │   │       ├── inc
│   │   │       │   └── usbd_hid_core.h
│   │   │       └── src
│   │   │           └── usbd_hid_core.c
│   │   └── Core
│   │       ├── inc
│   │       │   ├── usbd_core.h
│   │       │   ├── usbd_def.h
│   │       │   ├── usbd_ioreq.h
│   │       │   ├── usbd_req.h
│   │       │   └── usbd_usr.h
│   │       └── src
│   │           ├── usbd_core.c
│   │           ├── usbd_ioreq.c
│   │           └── usbd_req.c
│   ├── STM32_USB_OTG_Driver                                 USB OTG 库
│   │   ├── inc
│   │   │   ├── usb_bsp.h
│   │   │   ├── usb_core.h
│   │   │   ├── usb_dcd.h
│   │   │   ├── usb_dcd_int.h
│   │   │   ├── usb_defines.h
│   │   │   └── usb_regs.h
│   │   └── src
│   │       ├── usb_core.c
│   │       ├── usb_dcd.c

│   │       └── usb_dcd_int.c

从层级上分析，OTG是更加底层的，USBD的文件依赖于USB的文件，从对库的使用来讲，这些文件我们都不需要改动。

 我们需要改动的有可能是下面的文件

    ├── usb_bsp.c
    ├── usb_conf.h
    ├── usbd_conf.h
    ├── usbd_desc.c
    ├── usbd_desc.h
    └── usbd_usr.c

一些逻辑在main.c中操作，考虑如何发数据到主机端

对于一个工程来讲

    ├── stm32f4xx_conf.h
    ├── stm32f4xx_it.c
    ├── stm32f4xx_it.h
    ├── system_stm32f4xx.c

这几个文件也是从库里提取出来的，有可能会改动的

STM32F4xx_StdPeriph_Driver 这部分的内容基本上从来没有动过，是相当底层的驱动文件了

│   ├── CMSIS
│   │   ├── Include
│   │   │   ├── core_cm4.h
│   │   │   ├── core_cm4_simd.h
│   │   │   ├── core_cmFunc.h
│   │   │   └── core_cmInstr.h
│   │   └── ST
│   │       └── STM32F4xx
│   │           ├── Include
│   │           │   ├── stm32f4xx.h
│   │           │   └── system_stm32f4xx.h
│   │           └── Source
│   │               └── Templates
│   │                   └── arm
│   │                       └── startup_stm32f4xx.s

这些文件也是一般不会去动的，.s文件的名字可能有些区别

下面给出一个修改过的main.c 内容很精简了

/**
  ******************************************************************************
  * @file    main.c 
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    19-September-2011
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usbd_hid_core.h"
#include "usbd_usr.h"
#include "usbd_desc.h"

/** @addtogroup STM32F4-Discovery_Demo
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
  #if defined ( __ICCARM__ ) /*!< IAR Compiler */
    #pragma data_alignment = 4   
  #endif
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
__ALIGN_BEGIN USB_OTG_CORE_HANDLE  USB_OTG_dev __ALIGN_END;
__IO uint32_t TimingDelay;
/* Private function prototypes -----------------------------------------------*/
static uint32_t Demo_USBConfig(void);
static void Demo_Exec(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  RCC_ClocksTypeDef RCC_Clocks;
  /* SysTick end of count event each 10ms */
  RCC_GetClocksFreq(&RCC_Clocks);
  SysTick_Config(RCC_Clocks.HCLK_Frequency / 100);
  Demo_Exec();
}

/**
  * @brief  Execute the demo application.
  * @param  None
  * @retval None
  */
static void Demo_Exec(void)
{
	  uint8_t buf[4];
		buf[0]=0;
		buf[1]=7;
		buf[2]=7;
		buf[3]=0;
    /* USB configuration */
    Demo_USBConfig();
	while(1) {
		Delay(5);
		USBD_HID_SendReport (&USB_OTG_dev, 
												 buf,
												 4);
	}
}

/**
  * @brief  Initializes the USB for the demonstration application.
  * @param  None
  * @retval None
  */
static uint32_t Demo_USBConfig(void)
{
  USBD_Init(&USB_OTG_dev,
            USB_OTG_FS_CORE_ID,
            &USR_desc, 
            &USBD_HID_cb, 
            &USR_cb);
  
  return 0;
}

/**
  * @brief  Inserts a delay time.
  * @param  nTime: specifies the delay time length, in 10 ms.
  * @retval None
  */
void Delay(__IO uint32_t nTime)
{
  TimingDelay = nTime;

  while(TimingDelay != 0);
}

/**
  * @brief  Decrements the TimingDelay variable.
  * @param  None
  * @retval None
  */
void TimingDelay_Decrement(void)
{
  if (TimingDelay != 0x00)
  { 
    TimingDelay--;
  }
}

/**
  * @brief  This function handles the test program fail.
  * @param  None
  * @retval None
  */
void Fail_Handler(void)
{
  while(1)
  {
    Delay(5);
  }
}

#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 2011 STMicroelectronics *****END OF FILE****/