STM32F107 USB otg U盘读写

MCU型号：STM32F107

开发环境：MDK4

U盘大小：8GB

FAT：R0.08A

最终效果如下所示：

 

代码解析：

1.main.c

int main(void){  BSP_Init();  /* Init Host Library */ USBH_Init(&USB_OTG_FS_dev, &MSC_cb , &USR_Callbacks);  while (1) {    /* Host Task handler */    USBH_Process();    }}

BSP_Init()//使用到的硬件初始化

USBH_Init//USB有关的初始化

USBH_Process();//USB处理函数

2.USB初始化相关代码

voidUSBH_Init(USB_OTG_CORE_HANDLE *pdev,               USBH_Class_cb_TypeDef *class_cb,               USBH_Usr_cb_TypeDef *usr_cb){   printf("into USBH_Init()\r\n");  /* Hardware Init */ USB_OTG_BSP_Init();  printf("1\r\n"); /* Intialize Timer for delay function */ //USB_OTG_BSP_TimeInit();    printf("2\r\n"); /* configure GPIO pin used for switching VBUS power */ USB_OTG_BSP_ConfigVBUS();  printf("3\r\n"); /* Host de-initializations */ USBH_DeInit(); printf("4\r\n"); /*Register class and user callbacks */ USBH_Machine.class_cb = class_cb; USBH_Machine.usr_cb = usr_cb;  USBH_Machine.conn_cb = &USBH_DeviceConnStatus_cb; USBH_Machine.Control.hc_num_out = USBH_Alloc_Channel(&USB_OTG_FS_dev,0x00); USBH_Machine.Control.hc_num_in = USBH_Alloc_Channel(&USB_OTG_FS_dev,0x80);   USBH_Machine.conn_cb->ConnStatus = 0;   USBH_Machine.conn_cb->DisconnStatus = 0;  printf("5\r\n");  /* Start the USB OTG FS core */      HCD_Init(pdev); printf("6\r\n"); /* Upon Init call usr call back */ USBH_Machine.usr_cb->Init(); printf("7\r\n"); /* Enable Interrupts */ USB_OTG_BSP_EnableInterrupt();}

2.1USB_OTG_BSP_Init()函数 初始化USB时钟引脚中断等

void USB_OTG_BSP_Init(void){ GPIO_InitTypeDef GPIO_InitStructure;  /* Select USBCLK source */ RCC_OTGFSCLKConfig(RCC_OTGFSCLKSource_PLLVCO_Div3);  /* Enable the USB clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_OTG_FS, ENABLE) ;  RCC_APB2PeriphClockCmd( KEYA_PORT_RCC | KEYB_PORT_RCC | KEYC_PORT_RCC,ENABLE);           #ifdef SOF_OUTPUT_ENABLED /* To enable SOF pulse out on PAD */  RCC_APB2PeriphClockCmd(HOST_SOF_OUTPUT_RCC, ENABLE);  /* Configure SOF Pin */ GPIO_InitStructure.GPIO_Pin = HOST_SOF_SIGNAL; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(HOST_SOF_PORT, &GPIO_InitStructure);#endif   /* Configure pin for overcurrent detection */ #ifdef   OVERCURRENT_DET RCC_APB2PeriphClockCmd(HOST_OVRCURR_PORT_RCC, ENABLE);  /* Configure SOF Pin */ GPIO_InitStructure.GPIO_Pin = HOST_OVRCURR_LINE; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(HOST_OVRCURR_PORT, &GPIO_InitStructure);  /* Connect Button EXTI Line to Button GPIO Pin */ GPIO_EXTILineConfig(HOST_OVRCURR_PORT_SOURCE,HOST_OVRCURR_PIN_SOURCE);   /* Configure Button EXTI line */ EXTI_InitStructure.EXTI_Line = HOST_OVRCURR_EXTI_LINE; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); #endif //zjk: enable usb_H pwr        PE.15  RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOE,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOE, &GPIO_InitStructure); GPIO_SetBits(GPIOE , GPIO_Pin_15)   ;}

2.2USB_OTG_BSP_ConfigVBUS();//VBUS引脚初始化

void  USB_OTG_BSP_ConfigVBUS(void){ GPIO_InitTypeDef GPIO_InitStructure;   RCC_APB2PeriphClockCmd(HOST_POWERSW_PORT_RCC, ENABLE);   /* Configure Power Switch Vbus Pin */ GPIO_InitStructure.GPIO_Pin = HOST_POWERSW_VBUS; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(HOST_POWERSW_PORT, &GPIO_InitStructure);  /* By Default, DISABLE is needed on output of the Power Switch */ GPIO_ResetBits(HOST_POWERSW_PORT, HOST_POWERSW_VBUS);  USB_OTG_BSP_mDelay(200);   /*Delay is need for stabilising the Vbus Low in Reset Condition, when Vbus=1 and Reset-button is pressed by user */ }

2.3USBH_DeInit();//参数初始化

static USBH_StatusUSBH_DeInit(void){ /* Software Init */  USBH_Machine.gState = HOST_IDLE; USBH_Machine.gStateBkp = HOST_IDLE; USBH_Machine.EnumState = ENUM_IDLE; USBH_Machine.RequestState = CMD_SEND;   USBH_Machine.Control.state = CTRL_SETUP; USBH_Machine.Control.ep0size = USB_OTG_MAX_EP0_SIZE;   USBH_Device.address = USBH_DEVICE_ADDRESS_DEFAULT; USBH_Device.speed = HPRT0_PRTSPD_FULL_SPEED;  return USBH_OK;}

2.4 回调函数赋值地址

2.5HCD_Init(pdev);//

uint32_t HCD_Init(USB_OTG_CORE_HANDLE*pdev){ pdev->host.ConnSts = 0; pdev->host.ErrCnt  = 0; pdev->host.XferCnt  = 0; pdev->host.HC_Status  =HC_IDLE; pdev->host.hc[0].max_packet  =8;  USB_OTG_CoreInit(pdev);  /* Force Host Mode*/ USB_OTG_SetHostMode(pdev);  USBotg_OTG_CoreInitHost(pdev); USB_OTG_EnableGlobalInt(pdev);    return 0;}

2.6USB_OTG_BSP_EnableInterrupt();//中断使能

voidUSB_OTG_BSP_EnableInterrupt(void){  NVIC_InitTypeDef NVIC_InitStructure; /* Enable USB Interrupt */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);  NVIC_InitStructure.NVIC_IRQChannel = OTG_FS_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); #ifdef   OVERCURRENT_DET  /* Enable the Overcurrent Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = HOST_OVRCURR_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);  #endif}