Chapter 26. Memory Protection

You can follow the instructions in this chapter without doing those of the previous ones. For this, before doing them:

• with the Arduino:
  • assemble the toy computer components as explained in the assembly instructions.
  • connect the Arduino to your computer. Press the ERASE button for a few seconds, then press the RESET button. In a terminal on the host computer, type python3 flash_helper.py < backups/memory_protection.txt (in the directory where you unzipped scripts.zip).
• with the emulator: open this page.

26.4 Compilation and tests

Note: if you use the emulator, the bug introduced on purpose in the hello.toy program should show a "Unauthorized memory access" popup error message (instead of returning to the shell with a "hello crashed" message). This is because, in case of errors, the emulator shows a message instead of executing the Hard Fault handler. You then need to reload the emulator page before continuing with the next instructions.