Function lpc55_hal::boot_to_bootrom[−][src]

pub fn boot_to_bootrom() -> !
Expand description

This is a hack to jump to the bootrom without needing to assert ISP pin or destroy current firmware.

  1. Resets all peripherals & disconnect all interrupts (like in a soft reset)
  2. Enable Iocon and set the INVERT attribute for Pio0_5 (ISP pin).
  3. Jump to bootrom, which will think ISP pin is asserted.

Other prerequisites for this to work:

  • Must not be called from an interrupt handler.
  • TrustZone must not be disabled (unless you can find a way to re-enable it here).