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USB CDC Host

Marc Döbber

Hi !

I have to implement an USB CDC Host driver for STM32F4 controller.
Has anyone an idea/example how to do that. I only found examples for CDC Device.

Thanks

Marc

Parents
  • 0

    Here is a brief summary of ST Micro's host stack, which is common to STM32F105/107,F2xx,F4xx

    STM32F105/7 and STM32F2xx USB on-the-go Host and device library (UM1021) v2.0.0
    www.st.com/.../stm32_f105-07_f2xx_usb-host-device_lib.zip

    To implement CDC, modify usbh_msc_core.c
    Your application over CDC is written in usbh_usr.c, USBH_USR_Application()

    // Summary of ST Micro host stack
//    STM32_F105-07_F2xx_USB-Host-Device_Lib_V2.0.0
//    STM32F4-Discovery_FW_V1.1.0
//     -- STM32_USB_Device/Host/OTG_Library are identical with above library

//
// Host stack Framework
//

#include "usbh_core.h"
#include "usbh_usr.h"

USB_OTG_CORE_HANDLE           USB_OTG_Core;
USBH_HOST                     USB_Host;
extern USBH_Class_cb_TypeDef  USBH_MSC_cb;
extern USBH_Usr_cb_TypeDef    USR_Callbacks;

int main(void)
{
  /* Init Host Library */
  USBH_Init(&USB_OTG_Core, USB_OTG_FS_CORE_ID, &USB_Host, &USBH_MSC_cb, &USR_Callbacks);

  while (1)
  {
    /* Host Task handler */
    USBH_Process(&USB_OTG_Core, &USB_Host);
  }
}

    //
// Class driver   - refer to usbh_msc_core.c for typical implementation
//


    

#include "usbh_core.h"


    

// callbacks from USBH_Process() in main loop
USBH_Class_cb_TypeDef  USBH_MSC_cb =
{
  USBH_ClassDrv_InterfaceInit,
  USBH_ClassDrv_InterfaceDeInit,
  USBH_ClassDrv_ClassRequest,
  USBH_ClassDrv_Handle,
};


    

static USBH_Status USBH_ClassDrv_InterfaceInit( USB_OTG_CORE_HANDLE *pdev, void *phost )
{
  USBH_HOST *pphost = phost;


    

  // check interface/endpoint descriptors, if the target interface is supported or not
    pphost->device_prop.Itf_Desc[0].bInterfaceClass
    pphost->device_prop.Itf_Desc[0].bInterfaceProtocol
    pphost->device_prop.Ep_Desc[0][0].bEndpointAddress


    

  // open pipes using
    USBH_Alloc_Channel() / USBH_Open_Channel()


    

  if ( not_supported )
    pphost->usr_cb->USBH_USR_DeviceNotSupported();


    

  return USBH_OK;
}


    

static void USBH_ClassDrv_InterfaceDeInit  (USB_OTG_CORE_HANDLE *pdev, void *phost)
{
  // close pipes
    USB_OTG_HC_Halt() / USBH_Free_Channel()
}


    

static USBH_Status USBH_ClassDrv_ClassRequest(USB_OTG_CORE_HANDLE *pdev, void *phost)
{
  // initialization of USBH_ClassDrv_Handle()
  return USBH_OK;
}


    

static USBH_Status USBH_ClassDrv_Handle(USB_OTG_CORE_HANDLE *pdev, void *phost)
{
  // state machine to run this class
  // first, put class specific requests, if required
  // run class-specific protocol over USB
  while in idle, call ((USBH_HOST *)phost)->usr_cb->USBH_USR_Application()


    

  return USBH_OK;
}

    //
// Callbacks from host stack     -- usbh_usr.c
//

#include "usbh_usr.h"

USBH_Usr_cb_TypeDef USR_Callbacks =
{
  USBH_USR_Init,
  USBH_USR_DeInit,
  USBH_USR_DeviceAttached,
  USBH_USR_ResetDevice,
  USBH_USR_DeviceDisconnected,
  USBH_USR_OverCurrentDetected,
  USBH_USR_DeviceSpeedDetected,
  USBH_USR_Device_DescAvailable,
  USBH_USR_DeviceAddressAssigned,
  USBH_USR_Configuration_DescAvailable,
  USBH_USR_Manufacturer_String,
  USBH_USR_Product_String,
  USBH_USR_SerialNum_String,
  USBH_USR_EnumerationDone,
  USBH_USR_UserInput,
  USBH_USR_Application,
  USBH_USR_DeviceNotSupported,
  USBH_USR_UnrecoveredError
};

Most of callbacks are copied as is from existing usbh_usr.c

int USBH_USR_Application(void)
{
  //
  // application-specific state machine
  // called from USBH_Process() -> USBH_ClassDrv_Handle()
  //

  return 0;
}

    // control transfer


    

  // fill setup packet
  phost->Control.setup.b.bmRequestType
  phost->Control.setup.b.bRequest
  phost->Control.setup.b.wValue.w
  phost->Control.setup.b.wIndex.w
  phost->Control.setup.b.wLength.w


    

  Call USBH_CtlReq() repeatedly while it returns USBH_BUSY
     when finishes, it returns USBH_OK / USBH_FAIL / USBH_NOT_SUPPORTED (got STALL from device)


    

// bulk transfer
  OUT
  1) call USBH_BulkSendData()
  2) poll HCD_GetURB_State() while it returns USBH_BUSY
     when finishes, HCD_GetURB_State() returns URB_DONE
  IN
  1) call USBH_BulkReceiveData()
  2) same as above


    

// interrupt transfer
  OUT USBH_InterruptSendData()
  IN  USBH_InterruptReceiveData()
  same as above bulk transfer

    Tsuneo

Reply
  • 0

    Here is a brief summary of ST Micro's host stack, which is common to STM32F105/107,F2xx,F4xx

    STM32F105/7 and STM32F2xx USB on-the-go Host and device library (UM1021) v2.0.0
    www.st.com/.../stm32_f105-07_f2xx_usb-host-device_lib.zip

    To implement CDC, modify usbh_msc_core.c
    Your application over CDC is written in usbh_usr.c, USBH_USR_Application()

    // Summary of ST Micro host stack
//    STM32_F105-07_F2xx_USB-Host-Device_Lib_V2.0.0
//    STM32F4-Discovery_FW_V1.1.0
//     -- STM32_USB_Device/Host/OTG_Library are identical with above library

//
// Host stack Framework
//

#include "usbh_core.h"
#include "usbh_usr.h"

USB_OTG_CORE_HANDLE           USB_OTG_Core;
USBH_HOST                     USB_Host;
extern USBH_Class_cb_TypeDef  USBH_MSC_cb;
extern USBH_Usr_cb_TypeDef    USR_Callbacks;

int main(void)
{
  /* Init Host Library */
  USBH_Init(&USB_OTG_Core, USB_OTG_FS_CORE_ID, &USB_Host, &USBH_MSC_cb, &USR_Callbacks);

  while (1)
  {
    /* Host Task handler */
    USBH_Process(&USB_OTG_Core, &USB_Host);
  }
}

    //
// Class driver   - refer to usbh_msc_core.c for typical implementation
//


    

#include "usbh_core.h"


    

// callbacks from USBH_Process() in main loop
USBH_Class_cb_TypeDef  USBH_MSC_cb =
{
  USBH_ClassDrv_InterfaceInit,
  USBH_ClassDrv_InterfaceDeInit,
  USBH_ClassDrv_ClassRequest,
  USBH_ClassDrv_Handle,
};


    

static USBH_Status USBH_ClassDrv_InterfaceInit( USB_OTG_CORE_HANDLE *pdev, void *phost )
{
  USBH_HOST *pphost = phost;


    

  // check interface/endpoint descriptors, if the target interface is supported or not
    pphost->device_prop.Itf_Desc[0].bInterfaceClass
    pphost->device_prop.Itf_Desc[0].bInterfaceProtocol
    pphost->device_prop.Ep_Desc[0][0].bEndpointAddress


    

  // open pipes using
    USBH_Alloc_Channel() / USBH_Open_Channel()


    

  if ( not_supported )
    pphost->usr_cb->USBH_USR_DeviceNotSupported();


    

  return USBH_OK;
}


    

static void USBH_ClassDrv_InterfaceDeInit  (USB_OTG_CORE_HANDLE *pdev, void *phost)
{
  // close pipes
    USB_OTG_HC_Halt() / USBH_Free_Channel()
}


    

static USBH_Status USBH_ClassDrv_ClassRequest(USB_OTG_CORE_HANDLE *pdev, void *phost)
{
  // initialization of USBH_ClassDrv_Handle()
  return USBH_OK;
}


    

static USBH_Status USBH_ClassDrv_Handle(USB_OTG_CORE_HANDLE *pdev, void *phost)
{
  // state machine to run this class
  // first, put class specific requests, if required
  // run class-specific protocol over USB
  while in idle, call ((USBH_HOST *)phost)->usr_cb->USBH_USR_Application()


    

  return USBH_OK;
}

    //
// Callbacks from host stack     -- usbh_usr.c
//

#include "usbh_usr.h"

USBH_Usr_cb_TypeDef USR_Callbacks =
{
  USBH_USR_Init,
  USBH_USR_DeInit,
  USBH_USR_DeviceAttached,
  USBH_USR_ResetDevice,
  USBH_USR_DeviceDisconnected,
  USBH_USR_OverCurrentDetected,
  USBH_USR_DeviceSpeedDetected,
  USBH_USR_Device_DescAvailable,
  USBH_USR_DeviceAddressAssigned,
  USBH_USR_Configuration_DescAvailable,
  USBH_USR_Manufacturer_String,
  USBH_USR_Product_String,
  USBH_USR_SerialNum_String,
  USBH_USR_EnumerationDone,
  USBH_USR_UserInput,
  USBH_USR_Application,
  USBH_USR_DeviceNotSupported,
  USBH_USR_UnrecoveredError
};

Most of callbacks are copied as is from existing usbh_usr.c

int USBH_USR_Application(void)
{
  //
  // application-specific state machine
  // called from USBH_Process() -> USBH_ClassDrv_Handle()
  //

  return 0;
}

    // control transfer


    

  // fill setup packet
  phost->Control.setup.b.bmRequestType
  phost->Control.setup.b.bRequest
  phost->Control.setup.b.wValue.w
  phost->Control.setup.b.wIndex.w
  phost->Control.setup.b.wLength.w


    

  Call USBH_CtlReq() repeatedly while it returns USBH_BUSY
     when finishes, it returns USBH_OK / USBH_FAIL / USBH_NOT_SUPPORTED (got STALL from device)


    

// bulk transfer
  OUT
  1) call USBH_BulkSendData()
  2) poll HCD_GetURB_State() while it returns USBH_BUSY
     when finishes, HCD_GetURB_State() returns URB_DONE
  IN
  1) call USBH_BulkReceiveData()
  2) same as above


    

// interrupt transfer
  OUT USBH_InterruptSendData()
  IN  USBH_InterruptReceiveData()
  same as above bulk transfer

    Tsuneo

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