topic Re: LPC4350 - Mass Storage - problem with size over 4GB in LPC Microcontrollers

LPC4350 - Mass Storage - problem with size over 4GB

lpcware — Wed, 15 Jun 2016 18:35:32 GMT

Content originally posted in LPCWare by Dmitry on Mon Sep 24 04:46:19 MST 2012
Hi
I use HITEX board and example USBDEV_ROM - USB to SD-card bridge (as USB storage).
But in USBD_API (USBD_MSC_INIT_PARAM::MemorySize) I can use size of starage only 4GB(max) - uint32_t.
Show me way for decision this limitation....

Re: LPC4350 - Mass Storage - problem with size over 4GB

lpcware — Wed, 15 Jun 2016 18:35:33 GMT

Content originally posted in LPCWare by Dmitry on Mon Sep 24 22:38:00 MST 2012
Hello
I find solution. May be this will usefull for other users.

capacity = BlockSize * BlockSize

If capacity < 4GB then
USBD_MSC_INIT_PARAM_T::MemorySize = capacity
USBD_MSC_INIT_PARAM_T::BlockSize = BlockSize
USBD_MSC_INIT_PARAM_T::BlockCount = BlockSize

If capacity over 4GB
USBD_MSC_INIT_PARAM_T::MemorySize = 0xFFFFFFFF
USBD_MSC_INIT_PARAM_T::BlockSize = BlockSize
USBD_MSC_INIT_PARAM_T::BlockCount = BlockSize

Re: LPC4350 - Mass Storage - problem with size over 4GB

lpcware — Wed, 15 Jun 2016 18:35:34 GMT

Content originally posted in LPCWare by Muis on Thu May 08 01:42:25 MST 2014
I have the same problem with the USB rom driver, however specifying 0xFFFFFFFF for .MemorySize when size > 2GB doesnt fix the problem in my case, Windows still prompts to format the card. Also manually replacing BlockCount and MemorySize with values from a 2 GB card doesnt help. Anyone else have any ideas?