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Add support for variable UDS RX offsets (#631)

master
Jason Young 2021-03-07 23:33:55 -05:00 committed by GitHub
parent 0ae2be95a1
commit 3bb0408ee6
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 3 deletions
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7
python/uds.py
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@ -486,13 +486,14 @@ class IsoTpMessage():
FUNCTIONAL_ADDRS = [0x7DF, 0x18DB33F1]
def get_rx_addr_for_tx_addr(tx_addr):
def get_rx_addr_for_tx_addr(tx_addr, rx_offset=0x8):
if tx_addr in FUNCTIONAL_ADDRS:
return None
if tx_addr < 0xFFF8:
# standard 11 bit response addr (add 8)
return tx_addr + 8
# pseudo-standard 11 bit response addr (add 8) works for most manufacturers
# allow override; some manufacturers use other offsets for non-OBD2 access
return tx_addr + rx_offset
if tx_addr > 0x10000000 and tx_addr < 0xFFFFFFFF:
# standard 29 bit response addr (flip last two bytes)