標籤:
1. 前言
ST官方提供的USB庫STM32F0x2_USB-FS-Device_LibV1.0.0 是基於標準庫的,適用於STM32F0x2系列MCU,但是對於STM32F070來說,就需要稍作修改,本文就一直到STM32F070作一個筆記。
2. 移植
從STM中文官網上下載STM32F0x2 USB庫,地址:http://www.stmcu.org/document/detail/index/id-214961。用MDK開啟,首先在Manager Project Items下的Project Targets下新增一項 “STM32F070”:
然後切換到”STM32F070”這個Target: 。此後對所有工程屬性的修改都會使用於“STM32F070”,而不再是原先的“USBD_HID-STM32072B-EVAL”了。
接下來修改device為STM32F070RB:
工程配置弄好了後,接下來我們來修改代碼部分。
首先我們來編譯一下工程,發現此時是可以編譯通過的。但是燒錄到STM32F070的板子裡(這裡使用ST的NUCLEO-F070RB板)去時卻不能成功運行。
STM32F072與STM32F070這兩個MCU都有USB,且此IP沒有什麼不同,那麼差異是什麼呢?
對比它倆的時鐘樹:
如是STM32F072的時鐘樹,可只STM32F070是有一個內部48M的晶振,這個晶振是專門給USB提供時鐘的。
如是STM32F070的時鐘樹,對比STM32F072,發現STM32F070是沒有那個48M內部晶振的,因此在給USB提供晶振時,需要使用到外部晶振,於是,在代碼處找到設定晶振的代碼進行修改:
usb_bsp.c 的USB_BSP_Init函數內:
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標頭檔中注釋掉一些宏:
//#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 //關掉低功耗管理...//#define USB_CLOCK_SOURCE_CRS//STM32F070下是沒有CRS的
接下來整理一下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();}
這個是延時函數:
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的間隔時間:
在usbd_usr.c檔案中的:
void USBD_USR_Init(void){ /* SysTick used for periodic check mouse position */ SysTick_Config(SystemCoreClock /1000);}
最好在main函數內定時發送HID訊息:
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 }}
這樣代碼部分就完成了,通過以上main函數的代碼可知,我們是每隔1S向PC端發送一次滑鼠訊息,滑鼠會向右下角移動10個像素。
最後在NUCLEO板上測試OK!
最終移植後的工程:http://download.csdn.net/detail/flydream0/9590631
USB庫STM32F0x2移植到STM32F070筆記