LPC MicrocontrollersのトピックRe: Why usbd ReadReqEP can not get a USB_EVT_OUT event?

Why usbd ReadReqEP can not get a USB_EVT_OUT event?

lpcware — Wed, 15 Jun 2016 19:10:52 GMT

Content originally posted in LPCWare by mengxp on Thu Jun 09 07:30:27 MST 2016
I want to create a multiple LUNs mass storage via ROM USBD API
But LPCOpen do not have this example because it use ROM USBD API
And USBD API do not support multiple LUNs
First I want to know how the ROMD MSC works and I can rewrite and improve it

I did a reverse engineering...
Dump the 64K rom from memory and save to rom.bin
And then work with IDA Pro. Got some source code for the ROM USBD MSC part...(see attachment rom_disasm.zip)

I rewrote the MSC code (see msc212_src.zip\usbd_msc.c)
It look very same with the rom part

But it is very strange with the SCSI_WRITE path
When Windows write a file to mass storage
It always loss some USB_EVT_OUT, It will hang the windows Write operation

NEED SOME HELP~~

Original Attachment has been moved to: rom_disasm.zip

Original Attachment has been moved to: msc212_src.zip

Re: Why usbd ReadReqEP can not get a USB_EVT_OUT event?

lpcware — Wed, 15 Jun 2016 19:10:53 GMT

Content originally posted in LPCWare by mengxp on Thu Jun 09 07:36:24 MST 2016
by the way.

To NXP support:

Can I get ROMD MSC part source code? (only msc part)

Thx!

Re: Why usbd ReadReqEP can not get a USB_EVT_OUT event?

lpcware — Wed, 15 Jun 2016 19:10:54 GMT

Content originally posted in LPCWare by mengxp on Thu Jun 09 08:36:20 MST 2016

    else if ( event == USB_EVT_OUT_NAK )
    {
        if (pMsc->BulkStage != MSC_BS_DATA_OUT)   <<<<<<<<<<<<<<<<<< It seems that add this line to solve above problem
            MSC_ReadReqEP(pMsc, pMsc->BulkBuf);
    }

But in the ROM ,the code does not have a "If", I think add the "if" is reasonable
Why ROM can work well ??!!

Re: Why usbd ReadReqEP can not get a USB_EVT_OUT event?

lpcware — Sun, 19 Jun 2016 01:12:50 GMT

bump