topic Re: LPC5504 Smaller FLASH usable memory size in LPC Microcontrollers

LPC5504 Smaller FLASH usable memory size

pejo — Tue, 04 Feb 2025 13:17:58 GMT

Hi there,

I'm using an LPC5504. According to its own configuration and data from API functions the size is 128KB. While trying to store some data at the end of the memory map it turns out that I cannot write successfully in the last 2KB (in the range 1F800-1FFFF). Well, I can write on the memory without error but when I restart the board the data are just not there.

Is there a reason for this? Is it because of the space needed for spare memory in case some pages are not working anymore?

Re: LPC5504 Smaller FLASH usable memory size

Alice_Yang — Wed, 05 Feb 2025 06:10:27 GMT

Hello @pejo

Could you please show your project code, as well as your testing steps and results? I will help you check. Thank you.

Alice

Re: LPC5504 Smaller FLASH usable memory size

pejo — Wed, 05 Feb 2025 07:06:18 GMT

Hi Alice,

unfortunately I can't share the whole code without taking the time to remove proprietary code but I can share the procedure that you can use for test it:

General initialization:
- Disable All Interrupts
  Init Boot clocks
  Init timers
Flash initialization
- LPC55S0XFLASH_Init
  VERSION1_FLASH_API_TREE->flash_init
Check values on one page (512 (0x200) Bytes) at address 0x1F800
- LPC55S0XFLASH_Read
Flash fixed char (0x1A) on one page (512 (0x200) Bytes) at address 0x1F800
- LPC55S0XFLASH_Erase
  LPC55S0XFLASH_Program
  LPC55S0XFLASH_VerifyProgram
Check values on one page (512 (0x200) Bytes) at address 0x1F800 contain 0x1A:
- LPC55S0XFLASH_Read
Restart and check values --> Those values are not there anymore (it is a mix of zeros and 0xFF)

If I do the same at address 0x1F600 it works properly

Re: LPC5504 Smaller FLASH usable memory size

Alice_Yang — Thu, 06 Feb 2025 01:06:21 GMT

Hello @pejo

Please create a simple flash project by referring to the SDK demo "flashiap" for the LPC55S06. Then, check whether it can work with the address range from 0x1F800 to 0x1FFFF.

Alice

Re: LPC5504 Smaller FLASH usable memory size

pejo — Thu, 06 Feb 2025 09:36:21 GMT

Hi Alice,

I've found where the problem was, thanks to the example you mentioned. Just so that you know in the debug build I had a different linker script which reserved the section from 0x1F800 (sigh..). So, as you see it was all my mistake.

Thank you again and best regards