Kinetis MicrocontrollersのトピックRe: USB mass storage device from SD card with TWR-K60

USB mass storage device from SD card with TWR-K60

danielchai — Fri, 12 Jul 2013 12:20:58 GMT

Hi All,

I edit the code for msd_usb from RAM to SD card. Now my problem is that every time when I plug in the USB cable to my PC, it asks me to format. But I can not format it. It seems there is something wrong.

I just edit

From

case USB_MSC_DEVICE_READ_REQUEST :
    lba_data_ptr = (PTR_LBA_APP_STRUCT)val;
    #if RAM_DISK_APP
        USB_mem_copy(g_disk.storage_disk + lba_data_ptr->offset,
                lba_data_ptr->buff_ptr,
                lba_data_ptr->size);
    #endif
    break;
case USB_MSC_DEVICE_WRITE_REQUEST :
    lba_data_ptr = (PTR_LBA_APP_STRUCT)val;
    #if RAM_DISK_APP
    USB_mem_copy(lba_data_ptr->buff_ptr,
                    g_disk.storage_disk + lba_data_ptr->offset,
                    lba_data_ptr->size);
    #endif
    break;

case USB_MSC_DEVICE_READ_REQUEST :

lba_data_ptr = (PTR_LBA_APP_STRUCT)val;

fread(lba_data_ptr->buff_ptr, 1, 1, filesystem_handle);

break;

case USB_MSC_DEVICE_WRITE_REQUEST :

lba_data_ptr = (PTR_LBA_APP_STRUCT)val;

fwrite(lba_data_ptr->buff_ptr, 1, 1, filesystem_hanlde);

break;

I am new to this, any ideas will be appreciated.

Thank you.

-Daniel

Re: USB mass storage device from SD card with TWR-K60

CarlosCasillas — Thu, 08 Aug 2013 20:00:03 GMT

Hello Daniel.

Could you please specify which example are you using? Are you using Freescale USB Stack or MQX RTOS?

Best regards!

/Carlos

Re: USB mass storage device from SD card with TWR-K60

CarlosCasillas — Mon, 12 Aug 2013 20:00:33 GMT

Hi Daniel,

Attached you can find a simple SD card reader via USB using MQX. It is working but I just want you to know that the format is really slow. This one does not implement multi read/write blocks, and the performance may vary depending on the SD you are using.

This project is a little bit old, because it works in CW10.1 and K60 with MQX v3.7, but you can use it as reference.

Hope this will be useful for you.

Best regards!

/Carlos

Re: USB mass storage device from SD card with TWR-K60

danielchai — Tue, 13 Aug 2013 13:17:06 GMT

Hi Carlos,

Thank you. I will try it and post the update here.

-Daniel

Re: USB mass storage device from SD card with TWR-K60

danielchai — Mon, 06 Jan 2014 22:21:52 GMT

Hi Carlos,

I tried this code based on MQX4.0.2. It does not work.

After I change it to using SD card, the PC can not detect it.

Thank you.

-Daniel

Re: USB mass storage device from SD card with TWR-K60

pramodk_g_ — Fri, 28 Feb 2014 11:11:48 GMT

Hi Carlos,

I tried your code and it is working on my k60. Thanks for your help. But it has slow data rate as you mentioned, how we can improve this?

Any thoughts?

Thanks,

Pramod.

Re: USB mass storage device from SD card with TWR-K60

LJK1 — Mon, 14 Apr 2014 09:16:34 GMT

Hi Daniel,

did you get this going?

I tried it on the K64F120 and get the format problem.

When I read sector by sector using USB, each time I do it the data is different and not always the the same as what is on the SD.

Cheers,

Lisa

Re: USB mass storage device from SD card with TWR-K60

danielchai — Mon, 14 Apr 2014 19:06:29 GMT

Hi Lisa,

Actually, this code does not work. I contacted the one of the Freescale engineer, he said the read/write on the SD card can not be called in the USB reading/writing request, because all the functions in USB reading/writing function should be non-blocking function. When you debug into very deep level, it

will show you the Errorcode which indicate the function can not be called in current context.

-Daniel

Re: USB mass storage device from SD card with TWR-K60

LJK1 — Mon, 14 Apr 2014 23:26:25 GMT

Hi Daniel,

many thanks. Did you work out a solution?

I found that I

read most of the data but some is corrupted or appears to be in the

wrong place.

If USB reads should be non blocking, what should be

returned from the function? I assume there is some other way that the

data can be sent then rather than return from the function.

I will need

to investigate further.

Cheers,

Lisa

On 14/04/2014 21:07, Daniel Chai

wrote:

USB MASS STORAGE DEVICE FROM SD CARD WITH TWR-K60
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Re: USB mass storage device from SD card with TWR-K60

waynelai — Mon, 16 Jun 2014 05:25:02 GMT

May I know if there any progress about this feature ?

I've tried the code on K60, but it does not work.

Thanks.

Re: USB mass storage device from SD card with TWR-K60

danielchai — Thu, 19 Jun 2014 21:01:48 GMT

Take a look at this thread https://community.freescale.com/message/372336#372336

Re: USB mass storage device from SD card with TWR-K60

mircopizzichini — Wed, 01 Oct 2014 15:54:20 GMT

Hi pramodk.g.,

I also was able to make it work. But as you stated, data rate is really really slow... Have you been able to improve it?

Thanks

Mirco