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async def target_single_step(self): assert self._is_halted # ARM7TDMI has an erratum which causes a watchpoint unit that signals a breakpoint on two # consecutive cycles to not flag the second cycle correctly. (ARM7TDMI-S Errata List §5.1) # To work around this, we first set up watchpoint unit 1 to trigger on the current PC, # and then set up watchpoint unit 0 to trigger on anything but current PC. This makes # consecutive single stepping work, but could still fail if unit 1 was used to enter # debug mode prior to this call to `.target_single_step()`.