How to create a FAT error for testing?

[while(1);]

I want to find out how our system responds when a FAT error occurs during the FAT initialization.

Is there a function or method for killing the FAT file system so that on power up or reboot the initialization process fails?

I tried just opening a file for writing and continuously writing data with no close. This doesn't seem to break things.

I am using IDF 4.4.4 with Arduino.

Thanks,

Mike.

[lbernstone]

You can use esptool to target "damage" at a specific spot in the filesystem. For example, using the default fat partition scheme:

Code: Select all

./esptool.py erase_region 0x29000 8

This will clear (0xFF) the first 8 bytes of the partition.

Code: Select all

dd if=/dev/zero of=zeros bs=1 count=8
./esptool.py write_flash 0x29000 zeros

Is the same effect, but with zeros.

[ESP_Sprite]

You can use esptool to target "damage" at a specific spot in the filesystem. For example, using the default fat partition scheme:

Code: Select all

./esptool.py erase_region 0x29000 8

This will clear (0xFF) the first 8 bytes of the partition.

Note that this likely actually erases 4096 bytes, as that is the minimum quantity the flash chip allows you to erase.