【发布时间】：2016-12-07 16:15:20
【问题描述】：
我正在开发一个项目，在该项目中我必须使用 USB（虚拟 COM 端口）和 CAN 外设，但是当我在 STM32F4DISCOVERY 上运行代码时，PC 无法正确识别 VCP（“USB 设备无法识别”，错误代码 43)。 这是我的主要：
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization: global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Configure LED1 and LED3 */
BSP_LED_Init(LED4);
BSP_LED_Init(LED5);
/* Init Device Library */
USBD_Init(&USBD_Device, &VCP_Desc, 0);
/* Add Supported Class */
USBD_RegisterClass(&USBD_Device, USBD_CDC_CLASS);
/* Add CDC Interface Class */
USBD_CDC_RegisterInterface(&USBD_Device, &USBD_CDC_fops);
/* Start Device Process */
USBD_Start(&USBD_Device);
if(CAN_Polling() == HAL_OK)
{
/* OK: Turn on LED1 */
BSP_LED_On(LED4);
}
else
{
/* KO: Turn on LED3 */
BSP_LED_On(LED5);
}
/* Infinite loop */
while (1)
{
}
}
这是SystemClock_Config：
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
HAL_StatusTypeDef ret = HAL_OK;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Enable HSE Oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 25;
RCC_OscInitStruct.PLL.PLLN = 336;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 7;
ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
if(ret != HAL_OK)
{
while(1) { ; }
}
/* Activate the OverDrive to reach the 180 MHz Frequency */
/*ret = HAL_PWREx_EnableOverDrive();
if(ret != HAL_OK)
{
while(1) { ; }
}*/
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
if(ret != HAL_OK)
{
while(1) { ; }
}
}
所以我不明白为什么代码不能正常工作。 谁能帮我修复虚拟 COM 端口？
这是CAN初始化：
HAL_StatusTypeDef CAN_Polling(void)
{
CAN_FilterConfTypeDef sFilterConfig;
static CanTxMsgTypeDef TxMessage;
static CanRxMsgTypeDef RxMessage;
/*##-1- Configure the CAN peripheral #######################################*/
CanHandle.Instance = CANx;
CanHandle.pTxMsg = &TxMessage;
CanHandle.pRxMsg = &RxMessage;
CanHandle.Init.TTCM = DISABLE;
CanHandle.Init.ABOM = DISABLE;
CanHandle.Init.AWUM = DISABLE;
CanHandle.Init.NART = DISABLE;
CanHandle.Init.RFLM = DISABLE;
CanHandle.Init.TXFP = DISABLE;
CanHandle.Init.Mode = CAN_MODE_LOOPBACK;
CanHandle.Init.SJW = CAN_SJW_1TQ;
CanHandle.Init.BS1 = CAN_BS1_6TQ;
CanHandle.Init.BS2 = CAN_BS2_8TQ;
CanHandle.Init.Prescaler = 2;
if(HAL_CAN_Init(&CanHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*##-2- Configure the CAN Filter ###########################################*/
sFilterConfig.FilterNumber = 0;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = 0x0000;
sFilterConfig.FilterIdLow = 0x0000;
sFilterConfig.FilterMaskIdHigh = 0x0000;
sFilterConfig.FilterMaskIdLow = 0x0000;
sFilterConfig.FilterFIFOAssignment = 0;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.BankNumber = 14;
if(HAL_CAN_ConfigFilter(&CanHandle, &sFilterConfig) != HAL_OK)
{
/* Filter configuration Error */
Error_Handler();
}
/*##-3- Start the Transmission process #####################################*/
CanHandle.pTxMsg->StdId = 0x11;
CanHandle.pTxMsg->RTR = CAN_RTR_DATA;
CanHandle.pTxMsg->IDE = CAN_ID_STD;
CanHandle.pTxMsg->DLC = 2;
CanHandle.pTxMsg->Data[0] = 0xCA;
CanHandle.pTxMsg->Data[1] = 0xFE;
if(HAL_CAN_Transmit(&CanHandle, 10) != HAL_OK)
{
/* Transmition Error */
Error_Handler();
}
if(HAL_CAN_GetState(&CanHandle) != HAL_CAN_STATE_READY)
{
return HAL_ERROR;
}
/*##-4- Start the Reception process ########################################*/
if(HAL_CAN_Receive(&CanHandle, CAN_FIFO0,10) != HAL_OK)
{
/* Reception Error */
Error_Handler();
}
if(HAL_CAN_GetState(&CanHandle) != HAL_CAN_STATE_READY)
{
return HAL_ERROR;
}
if(CanHandle.pRxMsg->StdId != 0x11)
{
return HAL_ERROR;
}
if(CanHandle.pRxMsg->IDE != CAN_ID_STD)
{
return HAL_ERROR;
}
if(CanHandle.pRxMsg->DLC != 2)
{
return HAL_ERROR;
}
if((CanHandle.pRxMsg->Data[0]<<8|RxMessage.Data[1]) != 0xCAFE)
{
return HAL_ERROR;
}
return HAL_OK; /* Test Passed */
}
【问题讨论】：
标签： usb stm32 can-bus stm32f4discovery