LPC55xx Flash Access

yamakatb — Tue, 15 Dec 2020 05:28:46 GMT

Hello,

I'm trying to save data to the built-in Flash using LPC5514.

I think that the SDK "iap_flash" is mainly helpful, but I found the following description in the Note of the manual.

"Associated prefetches should be disabled before issuing any Flash commands."

I think that prefetches can be disabled by setting PREFEN, but when I check iap_flash and the device driver, I can't find the corresponding code.

I think I need to disable prefetches before running APIs that access flash (FLASH_Erase, FLASH_Program, etc.), is this wrong?

Details
Device: LPC5514SDK Version: 2.8.2 (released 2020-08-19)
Host OS: Windows
Toolchain: IAR Embedded Workbench for ARM

Re: LPC55xx Flash Access

Alice_Yang — Tue, 15 Dec 2020 09:18:14 GMT

Yes, you are right.

By default, PREFEN is disabled, so maybe the iap_flash demo missing it.