[SOLVED] Can J-Flash erase LPC locked with CRP2?

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  • [SOLVED] Can J-Flash erase LPC locked with CRP2?

    The LPC8xx microcontrollers have a Code Read Protection which disables the SWD port.
    If I set CRP2 in my firmware and flash it to the target (using Segger J-Flash), then the only way to erase and reflash is by talking to the ROM bootloader via the ISP interface (UART).
    There's a program called FlashMagic (and a few opensource linux tools: lpc21isp, lpcisp, and lpcprog from lpctools package) which can do a mass erase and restore the SWD access.

    Just wondering if any Segger tools can do the same.

  • Hi,

    Can J-Flash do it:
    Right now, it cannot.

    Can J-Link do it:
    Yes, using the SDK you could write an application that tells J-Link to use the TDI and TDO pins for UART communication. You would need an additional pin (e.g. TMS) manually controlled, connected to the ISP pin.
    You would also need to wire the reset pin.
    So 4 pins in total.
    With such a setup, you could do what FlashMagic does.

    There are currently no plans from the SEGGER side to write such an application.

    BR
    Alex
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