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python: check SPI response length (#1280)

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* python: check SPI response length

* fix read bytes

---------

Co-authored-by: Comma Device <device@comma.ai>
This commit is contained in:
Adeeb Shihadeh
2023-03-07 20:12:23 -08:00
committed by GitHub
parent 79210e8c2b
commit b231281c8b
1 changed files with 3 additions and 1 deletions
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4
python/spi.py
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@@ -136,6 +136,8 @@ class PandaSpiHandle(BaseHandle):
# get response length, then response
response_len_bytes = bytes(spi.xfer2(b"\x00" * 2))
response_len = struct.unpack("<H", response_len_bytes)[0]
if response_len > max_rx_len:
raise PandaSpiException("response length greater than max")
logging.debug("- receiving response")
dat = bytes(spi.xfer2(b"\x00" * (response_len + 1)))
@@ -218,7 +220,7 @@ class STBootloaderSPIHandle(BaseSTBootloaderHandle):
elif data != self.ACK:
raise PandaSpiMissingAck
def _cmd(self, cmd: int, data: Optional[List[bytes]] = None, read_bytes: int = TIMEOUT, predata=None) -> bytes:
def _cmd(self, cmd: int, data: Optional[List[bytes]] = None, read_bytes: int = 0, predata=None) -> bytes:
ret = b""
with self.dev.acquire() as spi:
# sync + command