Posted on November 22, 2013 at 18:35
Err..
Is it the first error after device plug-in?
I believe you'll see the first error at ''SelectInterface'' (Set_Interface) URB,
just after ''SelectConfiguration'' URB (Set_Configuration).
After the first error, recovery sequence follows.
Then, you should find the first error on the log.
I thought I'll trace the bug step by step with you.
But I'm busy this weekend, I can't access to this forum for a while.
And then, I've quickly analyzed the bug on my side.
I ran your code on my F4-Discorery board, with a hardware bus analyzer.
It fails at Set_Interface just after Set_Configuration.
On the debugger, your code drops into HardFault, in USBD_IsoINIncomplete() (usbd_core.c)
The direct reason of HardFault is,
on your code, IsoINIncomplete member of AUDIO_cb is NULL
This member (function pointer) is called at USBD_IsoINIncomplete.
Call to NULL pointer caused the HardFault.
To fix this bug, fill this member with a routine, like usbd_audio_OUT_Incplt()
usbd_audio_core.c
static uint8_t usbd_audio_IN_Incplt (void *pdev);
USBD_Class_cb_TypeDef AUDIO_cb =
{
usbd_audio_Init,
usbd_audio_DeInit,
usbd_audio_Setup,
NULL, /* EP0_TxSent */
usbd_audio_EP0_RxReady,
usbd_audio_DataIn,
usbd_audio_DataOut,
usbd_audio_SOF,
NULL, // <---------- usbd_audio_IN_Incplt
usbd_audio_OUT_Incplt,
USBD_audio_GetCfgDesc,
#ifdef USB_OTG_HS_CORE
USBD_audio_GetCfgDesc, /* use same config as per FS */
#endif
};
static uint8_t usbd_audio_IN_Incplt (void *pdev)
{
return USBD_OK;
}
The indirect reason is,
you are calling DCD_EP_Tx() at usbd_audio_Init() (usbd_audio_core.c),
which is called at Set_Configuration process.
Delete this call.
DCD_EP_Tx() expects isoc transaction from host.
As no isoc transaction comes, IsoINIncomplete interrupt occurs.
Your firmware should call DCD_EP_Tx() just after you got microphone sampling data in a array,
to send this array data to host.
Maybe you've replaced DCD_EP_PrepareRx() of the original usbd_audio_Init() into DCD_EP_Tx().
But there is asymmetry between Rx and Tx.
DCD_EP_PrepareRx() is called before host sends packet,
DCD_EP_Tx() is called just when device sends packet.
I'm sorry, I can't enjoy the debug process with you.
Tsuneo
