LPC MicrocontrollersのトピックRe: ROM_USB_msc for LPC1347 has RAM allocation problem

ROM_USB_msc for LPC1347 has RAM allocation problem

lpcware — Wed, 15 Jun 2016 16:56:41 GMT

Content originally posted in LPCWare by CC58 on Mon Jan 21 14:29:49 MST 2013
The ROM_USB_msc ROM code uses RAM space with a pointer without allocating space for its use.
When I try to add variable (2K array) in main.c and write to it, subsequent USB connect causes a hard fault.
If I allocate a 2K array and do no write to it, the thumbdrive comes up normally.
It appears the ROM routines are using RAM space from 0x800 to 0x1000 without informing the C compiler.

Looking at the code in app_usbd_cfg.h
#define MSC_PARAM_MEM 0x10000800
#define MSC_RARAM_SIZE 0x00000800

Which is then reference in main.c for init of USB
usb_param.mem_base = MSC_PARAM_MEM;
usb_param.mem_size = MSC_RARAM_SIZE;

I've managed to get around this in an ugly way by editing the MCU settings
such that RAM starts at 0x1000 and ends at 0x2000. This is not a proper solution.

What is the proper solution?

I believe it entails changing the project's linker directives somehow regarding sections?

Re: ROM_USB_msc for LPC1347 has RAM allocation problem

lpcware — Wed, 15 Jun 2016 16:56:42 GMT

Content originally posted in LPCWare by fcarlo on Tue Feb 05 06:46:49 MST 2013
I think that you should use USB RAM as base memory location from where data and buffers are allocated.
Take a look at the data sheet to know which alignment is required for the data (see "mem_base" for both USBD_API_INIT_PARAM and USBD_MSC_INIT_PARAM)

Re: ROM_USB_msc for LPC1347 has RAM allocation problem

lpcware — Wed, 15 Jun 2016 16:56:43 GMT

Content originally posted in LPCWare by aakicee on Mon Apr 06 22:31:55 MST 2015
is it the proper solution?