topic Re: System clock to be 100Mhz for LPC5536 for FLASH ERASE in LPC Microcontrollers

System clock to be 100Mhz for LPC5536 for FLASH ERASE

ja_lpc — Wed, 08 Nov 2023 15:48:07 GMT

In LPC5536 manual its mentioned :

"Note: Flash ERASE and PROGRAM operations must be performed with a system clock below or equal to 100 MHz."

But when I went through the code sample in "flashiap", i see that the boot clock is set to 150MHZ.

But I don't see the clock being reduced to 100Mhz anywhere in this code before erasing flash region. Why is that so?

Is that already handled by the flash APIs (from BOOTLOADER_API_TREE_POINTER)

Also, where can I find the function definitions of these APIs? (for example

BOOTLOADER_API_TREE_POINTER->flashDriver->flash_program())

Re: System clock to be 100Mhz for LPC5536 for FLASH ERASE

Alice_Yang — Tue, 14 Nov 2023 07:44:36 GMT

Hello @ja_lpc

1) Maybe there is issue with "flashiap", when you use flash ERASE and PROGRAM operations must be performed with a system clock below or equal to 100 MHz as UM said.

2) The flash API is ROM api, source code are not public.

Alice

Re: System clock to be 100Mhz for LPC5536 for FLASH ERASE

ja_lpc — Thu, 16 Nov 2023 12:49:27 GMT

May be you can raise a ticket to fix this in flashiap.
Because that is being taken as reference example.