使用studio建立工程，USB CDC设备无法打开？

发布于 2019-12-30 14:20:42 浏览：2047 订阅该版

* 本帖最后由 sunnymjay 于 2019-12-30 14:23 编辑 *

MCU是STM32F103C8t6，USB使用裸机Demo可以正常使用。
用RT-Thread Studio生成v4.0.2版本的Demo工程。

步骤如下：
1.修改了board.c的时钟，外部8M晶振（HAL库不太熟，如有错误请指正！谢谢）：

RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
    RCC_PeriphCLKInitTypeDef RCC_PeriphClkInitStruct = {0};
    /** Initializes the CPU, AHB and APB busses clocks
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;//72MHZ
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
      Error_Handler();
    }
    /** Initializes the CPU, AHB and APB busses clocks
    */
#if defined(SOC_SERIES_STM32F0) || defined(SOC_SERIES_STM32G0)
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                 |RCC_CLOCKTYPE_PCLK1;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
#elif defined(SOC_SERIES_STM32H7)
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                 |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
                                 |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
    RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
    RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV1;
    RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV1;
#else
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                 |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
#endif
    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
    {
      Error_Handler();
    }
    RCC_PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
    RCC_PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV1_5;
    RCC_PeriphClkInitStruct.AdcClockSelection = RCC_ADCPCLK2_DIV8;
    RCC_PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
    HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInitStruct);

2.加入了bsp包中的 "drv_usbd.c"和“usbd_config.h” 对引用和头文件稍作修改：
#include <rtthread.h>
#ifdef RT_USING_USB_DEVICE
#include <rtdevice.h>
#include "board.h"
#include <string.h>
#include "usbd_config.h"
#include "drv_common.h"

3.main函数增加：
    dev = rt_device_find("vcom");
    if (dev)
        rt_device_open(dev, RT_DEVICE_FLAG_RDWR);
    else
        return -RT_ERROR;

运行结果：
1.有设备
 \ | /
- RT -     Thread Operating System
 / | \     4.0.2 build Dec 30 2019
 2006 - 2019 Copyright by rt-thread team
msh >list_device
device           type         ref count
-------- -------------------- ----------
vcom     Character Device     1
usbd     USB Slave Device     0
uart1    Character Device     2
pin      Miscellaneous Device 0
msh >

2.连接电脑，usb 设备描述符请求失败

3.调试过，usb初始化过程都有，开中断也有，就是usb中断进不去

现在不知道是哪里有问题，求教，谢谢!