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****/