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target: family: lpc5500: pre-reset via debug mailbox in reset_and_halt #1919

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target: family: lpc5500: pre-reset via debug mailbox in reset_and_halt #1919

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14 changes: 14 additions & 0 deletions pyocd/target/family/target_lpc5500.py
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Original file line number Diff line number Diff line change
Expand Up @@ -243,6 +243,20 @@ class CortexM_LPC5500(CortexM_v8M):

def reset_and_halt(self, reset_type=None):
"""@brief Perform a reset and stop the core on the reset handler. """

# Reset the chip via the debug mailbox, re-enable debug access, and
# halt the core before any AHB-AP access. Running firmware can cause
# AHB bus contention that results in SWD WAIT/FAULT ACK failures.
# The debug mailbox has a dedicated path that bypasses the AHB bus.
target = self.session.target
dm_ap = target.aps.get(DM_AP)
if dm_ap is not None:
try:
target.unlock(dm_ap)
self.halt()
except exceptions.Error as err:
LOG.debug("debug mailbox pre-reset failed: %s", err)

halt_only = False
catch_mode = 0

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