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tests/multi_exmod/machine_can_05: Fix test setup race. #19614

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tests/multi_exmod/machine_can_05: Fix test setup race. #19614

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10 changes: 9 additions & 1 deletion tests/multi_extmod/machine_can_05_tx_prio_cancel.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,13 +43,21 @@ def instance0():
# requirement)
multitest.wait("instance1 ready")

bcast_countdown = 5

# "Babble" medium priority messages onto the bus to prevent
# instance1() from sending anything lower priority than this
while len(recv) < ITERS:
for id in range(0x5000, 0x6000):
can.send(id, b"BABBLE", CAN.FLAG_EXT_ID)
if len(recv) >= ITERS:
break
if bcast_countdown > 0:
# queue some "babble" messages onto the bus before signalling to
# instance1 that it can start trying to send
bcast_countdown -= 1
if not bcast_countdown:
multitest.broadcast("instance0 babbling")

print("received", ITERS, "messages")
for can_id in recv:
Expand Down Expand Up @@ -92,7 +100,7 @@ def instance1():
# make sure instance0 can queue outgoing medium-priority
# babble before we start trying to send, so we're trying to
# send onto an already busy bus
time.sleep_ms(100)
multitest.wait("instance0 babbling")

for i in range(ITERS):
# Fill the transmit queue with low priority messages (all extended IDs)
Expand Down
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