💻 Expanding RP2040 Memory: Using QSPI RAM with RP2040's SSI in read-write mode

The article discusses a useful lifehack for expanding the memory of the 🍓 RP2040 microcontroller. The RP2040 typically supports flash XIP (eXecute In Place), which allows for executing code directly from external flash memory, but it only supports read and execute operations, not writes.

The author overcomes this limitation by employing a combination of hardware (OR and NOT gates) and software (a custom HardFault handler) to copy code from flash to RAM during boot, then switch the RP2040 to execute from RAM, effectively making it behave like real memory.

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