topic Re: how to write in no init ram for sharing in boot and application code in LPC Microcontrollers

how to write in no init ram for sharing in boot and application code

hari3 — Mon, 27 Jan 2025 20:04:56 GMT

i have using lpc54628 and i am developing boot and application code. i have decalred a variable in ram region which is portioned for 1k in application code and using extern if i fetch from boot code it shows undefined reference to the flag, i want to know how to add a variable to no init ram and share the variable between boot and application code and how to use that variable in boot code.

Re: how to write in no init ram for sharing in boot and application code

ZhangJennie — Tue, 28 Jan 2025 06:21:13 GMT

Hi @hari3

Please follow below steps you will make it.

1. Create a separate RAM_0 (RAM5) in MCU setting

2. Set RAM_0 as .noinit

Then build the project.

3. Define gloabl variables g_val in this NOINIT section.

4. execute download code to Flash -> run code -> reset -> step over run. You will see g_val not initialize

Hope this helps,

Jun Zhang