topic LPC43xx - USB Device MSC Rom API - Device Memory size &gt; 4GB in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB-Device-MSC-Rom-API-Device-Memory-size-gt-4GB/m-p/575050#M19153 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by nsmith17044 on Wed Feb 24 08:00:46 MST 2016</STRONG><BR /><SPAN>I created this topic separately from my previous post as the question is clearer now. </SPAN><BR /><BR /><SPAN>Evaluating the LPC43xx LPCOpen project usbd_rom_msc_ram.&nbsp; My eventual goal is to target MMC integration for cards larger than 4GB.&nbsp; It seems the original documentation on the MSC ROM API uses USBD_MSC_INIT_PARAM_T : MemorySize which is 32bits.&nbsp; This would limit the full support size to 4GB.&nbsp; However, looking at the current header file USDB_MSCUSER.H in the LPC_CHIP_43XX LPCOpen library (V2_12), I see at the end of the structure&nbsp;&nbsp; uint64_t&nbsp; MemorySize64;&nbsp;&nbsp; I assume this has been added so to support memory devices larger the 4GB.&nbsp; However I have found no documentation to support this member nor an example that uses it.</SPAN><BR /><BR /><SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fdocs.lpcware.com%2Fusbromlib%2Fv1.0%2Fstruct_u_s_b_d___m_s_c___i_n_i_t___p_a_r_a_m___t.html%23details" rel="nofollow" target="_blank">http://docs.lpcware.com/usbromlib/v1.0/struct_u_s_b_d___m_s_c___i_n_i_t___p_a_r_a_m___t.html#details</A></SPAN><BR /><BR /><SPAN>Can anyone clarify if sizes larger then 4GB are supported?&nbsp; Should the MemorySize parameter be defined as 0 and then set the MemorySize64 to the actual size?&nbsp; Are there any other initialization required?&nbsp; </SPAN><BR /><BR /><BR /><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 18:59:09 GMT lpcware 2016-06-15T18:59:09Z LPC43xx - USB Device MSC Rom API - Device Memory size > 4GB https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB-Device-MSC-Rom-API-Device-Memory-size-gt-4GB/m-p/575050#M19153 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by nsmith17044 on Wed Feb 24 08:00:46 MST 2016</STRONG><BR /><SPAN>I created this topic separately from my previous post as the question is clearer now. </SPAN><BR /><BR /><SPAN>Evaluating the LPC43xx LPCOpen project usbd_rom_msc_ram.&nbsp; My eventual goal is to target MMC integration for cards larger than 4GB.&nbsp; It seems the original documentation on the MSC ROM API uses USBD_MSC_INIT_PARAM_T : MemorySize which is 32bits.&nbsp; This would limit the full support size to 4GB.&nbsp; However, looking at the current header file USDB_MSCUSER.H in the LPC_CHIP_43XX LPCOpen library (V2_12), I see at the end of the structure&nbsp;&nbsp; uint64_t&nbsp; MemorySize64;&nbsp;&nbsp; I assume this has been added so to support memory devices larger the 4GB.&nbsp; However I have found no documentation to support this member nor an example that uses it.</SPAN><BR /><BR /><SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fdocs.lpcware.com%2Fusbromlib%2Fv1.0%2Fstruct_u_s_b_d___m_s_c___i_n_i_t___p_a_r_a_m___t.html%23details" rel="nofollow" target="_blank">http://docs.lpcware.com/usbromlib/v1.0/struct_u_s_b_d___m_s_c___i_n_i_t___p_a_r_a_m___t.html#details</A></SPAN><BR /><BR /><SPAN>Can anyone clarify if sizes larger then 4GB are supported?&nbsp; Should the MemorySize parameter be defined as 0 and then set the MemorySize64 to the actual size?&nbsp; Are there any other initialization required?&nbsp; </SPAN><BR /><BR /><BR /><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 18:59:09 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB-Device-MSC-Rom-API-Device-Memory-size-gt-4GB/m-p/575050#M19153 lpcware 2016-06-15T18:59:09Z