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Fix/1553 rtt cb not found #1583

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merged 4 commits into from
Aug 5, 2023
Merged

Fix/1553 rtt cb not found #1583

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8c0db06
fix/rtt(1553): search only for the length of control block ID
tdasika Jul 10, 2023
15cb529
Merge branch 'pyocd:main' into fix/1553_rtt_CB_not_found
tdasika Jul 13, 2023
0ae07ea
Merge branch 'pyocd:main' into fix/1553_rtt_CB_not_found
tdasika Jul 31, 2023
3c6faa7
Update rtt.py
tdasika Jul 31, 2023
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15 changes: 6 additions & 9 deletions pyocd/debug/rtt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -421,10 +421,7 @@ def __init__(self, target: SoCTarget, address: int = None,
self._cb_search_size_words = 0
else:
self._cb_search_size_words = size // 4
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extra_id_bytes = SEGGER_RTT_CB.acID.size - len(control_block_id)
control_block_bytes = control_block_id + b'\0' * extra_id_bytes
self._control_block_id = struct.unpack("<IIII", control_block_bytes)
self._control_block_id = control_block_id

def _find_control_block(self) -> Optional[int]:
addr: int = self._cb_search_address & ~0x3
Expand All @@ -436,20 +433,20 @@ def _find_control_block(self) -> Optional[int]:
offset: int = 0

while search_size:
read_size = min(search_size, 32)
data = self.target.read_memory_block32(addr, read_size)
read_size = min(search_size, 8)
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data = self.target.read_memory_block8(addr, read_size)

if not data:
break

for word in data:
if word == self._control_block_id[offset]:
for byte in data:
if byte == self._control_block_id[offset]:
offset += 1
if offset == id_len:
break
else:
num_skip_words = (offset + 1)
addr += (num_skip_words * 4)
addr += (num_skip_words * 1)
search_size -= num_skip_words
offset = 0

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