USB库STM32F0x2移植到STM32F070笔记

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1. 前言

ST官方提供的USB库STM32F0x2_USB-FS-Device_LibV1.0.0 是基于标准库的,适用于STM32F0x2系列MCU,但是对于STM32F070来说,就需要稍作修改,本文就一直到STM32F070作一个笔记。

2. 移植

从STM中文官网上下载STM32F0x2 USB库,地址:http://www.stmcu.org/document/detail/index/id-214961。用MDK打开,首先在Manager Project Items下的Project Targets下新增一项 “STM32F070”:


然后切换到”STM32F070”这个Target: 。此后对所有工程属性的修改都会使用于“STM32F070”,而不再是原先的“USBD_HID-STM32072B-EVAL”了。

接下来修改device为STM32F070RB:


工程配置弄好了后,接下来我们来修改代码部分。

首先我们来编译一下工程,发现此时是可以编译通过的。但是烧录到STM32F070的板子里(这里使用ST的NUCLEO-F070RB板)去时却不能成功运行。

 

STM32F072与STM32F070这两个MCU都有USB,且此IP没有什么不同,那么差异是什么呢?

对比它俩的时钟树:


如上图是STM32F072的时钟树,可知STM32F072是有一个内部48M的晶振,这个晶振是专门给USB提供时钟的。


如上图是STM32F070的时钟树,对比STM32F072,发现STM32F070是没有那个48M内部晶振的,因此在给USB提供晶振时,需要使用到外部晶振,于是,在代码处找到设置晶振的代码进行修改:

usb_bsp.c 的USB_BSP_Init函数内:

RCC_HSEConfig(RCC_HSE_Bypass);  /* Wait till HSE is ready */  while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET)  {}  /*Config the PREDIV for RCC_CFGR2*/  RCC_PREDIV1Config(RCC_PREDIV1_Div1);/*HSE/PREDIV selected as PLL input clock*/  RCC_PLLConfig(RCC_PLLSource_PREDIV1,RCC_PLLMul_6);  /* Enable PLL */  RCC_PLLCmd(ENABLE);  /* Wait till PLL is ready */  while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)  {}/*use the PLLCLK as system input clock*/  RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);/* Wait till PLL is used as system clock source */while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL){}  RCC_HCLKConfig(RCC_SYSCLK_Div1);  RCC_PCLKConfig(RCC_HCLK_Div1);  /* Configure USBCLK from PLL clock */  RCC_USBCLKConfig(RCC_USBCLK_PLLCLK);

在usb_conf.h头文件中注释掉一些宏:

//#include "stm32072b_eval.h"...//#ifdef USE_STM32072B_EVAL /* When using STM32072B_EVAL board the internal pullup must be enabled */ #define INTERNAL_PULLUP//#endif...//#define USB_DEVICE_LOW_PWR_MGMT_SUPPORT   //关掉低功耗管理...//#define USB_CLOCK_SOURCE_CRS//STM32F070下是没有CRS的

接下来整理一下systick:

void SysTick_Handler(void){#if 0uint8_t buf[4] ={0,10,10,0};USBD_HID_SendReport (&USB_Device_dev,                         buf,                         4);#endif//#if 0//  uint8_t *buf;////  /* Get Joystick position *///  buf = USBD_HID_GetPos();////  /* Update the cursor position *///  if((buf[1] != 0) ||(buf[2] != 0))//  {//    /* Send Report *///    USBD_HID_SendReport (&USB_Device_dev,//                         buf,//                         4);//  }//#endif  TimingDelay_Decrement();}

这个是延时函数:

void HAL_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--;  }}

修改下systick的间隔时间:

在usbd_usr.c文件中的:

void USBD_USR_Init(void){  /* SysTick used for periodic check mouse position */  SysTick_Config(SystemCoreClock /1000);}

最后在main函数内定时发送HID消息:

int main(void){uint8_t buf[4] ={0,10,10,0};  /*!< At this stage the microcontroller clock setting is already configured,       this is done through SystemInit() function which is called from startup       file (startup_stm32f072.s) before to branch to application main.       To reconfigure the default setting of SystemInit() function, refer to       system_stm32f0xx.c file      */  /* The Application layer has only to call USBD_Init to  initialize the USB low level driver, the USB device library, the USB clock  ,pins and interrupt service routine (BSP) to start the Library*/  USBD_Init(&USB_Device_dev,            &USR_desc,            &USBD_HID_cb,            &USR_cb);  while (1)  {#if 1  USBD_HID_SendReport (&USB_Device_dev,                         buf,                         4);  //delay  HAL_Delay(1000);#endif  }}

这样代码部分就完成了,通过以上main函数的代码可知,我们是每隔1S向PC端发送一次鼠标消息,鼠标会向右下角移动10个像素。

 

最后在NUCLEO板上测试OK!


最终移植后的工程下载地址:http://download.csdn.net/detail/flydream0/9590631



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