USB庫STM32F0x2移植到STM32F070筆記
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打開,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的板子裏(這裏使用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沒有什麽不同,那麽差異是什麽呢?
對比它倆的時鐘樹:
如上圖是STM32F072的時鐘樹,可知STM32F072是有一個內部48M的晶振,這個晶振是專門給USB提供時鐘的。
如上圖是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,在代碼處找到設置晶振的代碼進行修改:
usb_bsp.c 的USB_BSP_Init函數內:
[cpp] view plain copy- 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頭文件中註釋掉一些宏:
[cpp] view plain copy- //#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:
[cpp] view plain copy- void SysTick_Handler(void)
- {
- #if 0
- uint8_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:
[cpp] view plain copy- 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文件中的:
[cpp] view plain copy- void USBD_USR_Init(void)
- {
- /* SysTick used for periodic check mouse position */
- SysTick_Config(SystemCoreClock /1000);
- }
最後在main函數內定時發送HID消息:
[cpp] view plain copy- 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端發送一次鼠標消息,鼠標會向右下角移動10個像素。
最後在NUCLEO板上測試OK!
最終移植後的工程下載地址:http://download.csdn.net/detail/flydream0/9590631
更多資源地址:www.makeru.com.cn/?t=12
USB庫STM32F0x2移植到STM32F070筆記