STM32G473 executing from FLASH while programing FLASH
Hello,
I'm having an issue while programming a small section of FLASH memory during runtime of my device.
Our device executes its program from FLASH memory. In-addition, we reconfigured the systick timer to run at 20kHz and this is the heartbeat of our program. Every 1/20kHz secs, the device reads the user input and then updates some signal outputs.
Occasionally we need to save state so that we can recall certain settings in-case of a loss of power. To do this, we set a flag and then in the main while() loop we initiate a write to flash memory. We only need to write 64 bytes and we do it using a wear-leveling technique. I was expecting this to happen seamlessly in the background but I was surprised to find that it interrupts the flow of the systick code (even though this is a high priority interrupt). This results in a glitch in the user interface that is noticeable in certain scenarios.
I've used a pair of GPIO pins to show what happens:
-The top pulse is the systick heartbeat. We set the gpio pin high when we start executing this code and then set it low when we're done.
-The bottom pulse is from the main while() loop that briefly attempts to write to flash memory.
My question is - is this there any way to avoid this stall? Is it not possible on G473 to write to flash memory while executing from flash?
I suppose I could run the code from SRAM but I thought I'd see if there was another workaround.
