Posted on February 01, 2016 at 04:51Hi:
My project use STM32F427compiled at uVision 5.11, I use USB library V2.1.0 for MSC Host class. It builds OK and works OK. Then I try to merge HID host lib, now the compiler report link error L6985E when I add a line to change class callback function from USBH_MSC_cb to HID_cb (These two callback funs are from library example, which can build OK on original example. I can't see the relationship between link errorL6985E and HID host function. The reported address 0x40024000 location is at backup RAM, where I defined as a variable array, seems nothing to do with USB HID class.
Here is the link message:
compiling usbh_hid_mouse.c...
compiling usbh_usr_lcd.c...
linking...
.\OBJ\st_firmware.axf: Error: L6985E: Unable to automatically place AT section stm32variable.o(.ARM.__AT_0x40024000) with required base address 0x40024000. Please manually place in the scatter file using the --no_autoat option.
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 1 error messages.
''.\OBJ\ut80_st_firmware.axf'' - 1 Error(s), 11 Warning(s).
The link error happens when I try to change class callback function depending on MSC or HID device after USB emulation.
void USBH_Process(USB_OTG_CORE_HANDLE *pdev , USBH_HOST *phost)
{
....
switch (phost->gState){
case HOST_IDLE :
....
break;
case HOST_DEV_ATTACHED :
....
break;
case HOST_ENUMERATION:
/* Check for enumeration status */
if ( USBH_HandleEnum(pdev , phost) == USBH_OK){
/* The function shall return USBH_OK when full enumeration is complete */
/* user callback for end of device basic enumeration */
phost->usr_cb->EnumerationDone();
if(UsbStatus.bi.port_status == USB_DEVICE_STICK){
USBH_SetClass(phost, &USBH_MSC_cb);
}
else{
USBH_SetClass(phost, &HID_cb);
// If remark this line, It builds OK.
}
phost->gState = HOST_USR_INPUT;
}
break;
....
....
where:
void USBH_SetClass(USBH_HOST *phost, USBH_Class_cb_TypeDef *class_cb)
{
phost->class_cb = class_cb;
}
And the location for 0x40024000 is defined as:
float backup[1024] __attribute__((at(0x40024000 )));
The clas callback function is:
typedef struct _USBH_Class_cb
{
USBH_Status (*Init)\
(USB_OTG_CORE_HANDLE *pdev , void *phost);
void (*DeInit)\
(USB_OTG_CORE_HANDLE *pdev , void *phost);
USBH_Status (*Requests)\
(USB_OTG_CORE_HANDLE *pdev , void *phost);
USBH_Status (*Machine)\
(USB_OTG_CORE_HANDLE *pdev , void *phost);
} USBH_Class_cb_TypeDef;
USBH_Class_cb_TypeDef USBH_MSC_cb =
{
USBH_MSC_InterfaceInit,
USBH_MSC_InterfaceDeInit,
USBH_MSC_ClassRequest,
USBH_MSC_Handle,
};
USBH_Class_cb_TypeDef HID_cb =
{
USBH_HID_InterfaceInit,
USBH_HID_InterfaceDeInit,
USBH_HID_ClassRequest,
USBH_HID_Handle
};
#stm32
