STM32L4R9＿How to not erase NOR memory at program start

[YEnom.1]

Based on the sample software of FMC_NOR, I am creating a program to store the data received by UART in NOR memory.

Operation content:

(1) Data reception via UART

(2) Write the received data to NOR memory

(3) Use the reset switch to switch to the reception standby state again and erase the NOR memory.

I want to erase the NOR memory only in (3), but the NOR memory is also erased when the program is executed.

How can I branch between program execution and the reset switch?

[waclawek.jan]

What do you mean by "reset switch"?

A common practice is to use a communication protocol over USART, which enables to erase an attached memory upon command from PC.

JW

[Tesla DeLorean]

This is a logic problem with code you're not showing.

The STM32L4​ isn't going to erase external NOR flash, or internal flash, without some explicit coding to do so on your part. Show the code that determines an erase should be done.