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LPC55S69: USB SRAM usage in ROM

Question asked by Eugene Hiihtaja on Feb 6, 2020
Latest reply on Feb 9, 2020 by xiangjun.rong

Hi !


I try to see if USB_SRAM at ox50100000 can be used for keep some data over reboot.

And it seems to me it is wiped by 0x00 by ROM code every reboot even ISP USB flashing is not used.

SRAM4 area at 0x30040000 is keep data over reboot for example.


Could you look in what cases USB_RAM wiped ? All the time over reboot or in some cases.

Can it be disabled some how in any setting if USB ISP flashing is  not planned to be used at all ?

My application need a lot of SRAM and USB_SRAM need as well.


USB_SRAM is not mentioned in any Linked files and regular firmware is not counted it as bss are and not zeroed it for sure.