circuitpython/tests/pyb/can.py

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try:
from pyb import CAN
except ImportError:
print("SKIP")
raise SystemExit
from array import array
import micropython
import pyb
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# test we can correctly create by id (2 handled in can2.py test)
for bus in (-1, 0, 1, 3):
try:
CAN(bus, CAN.LOOPBACK)
print("CAN", bus)
except ValueError:
print("ValueError", bus)
CAN(1).deinit()
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CAN.initfilterbanks(14)
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can = CAN(1)
print(can)
# Test state when de-init'd
print(can.state() == can.STOPPED)
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can.init(CAN.LOOPBACK)
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print(can)
print(can.any(0))
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# Test state when freshly created
print(can.state() == can.ERROR_ACTIVE)
# Test that restart can be called
can.restart()
# Test info returns a sensible value
print(can.info())
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# Catch all filter
can.setfilter(0, CAN.MASK16, 0, (0, 0, 0, 0))
can.send("abcd", 123, timeout=5000)
print(can.any(0), can.info())
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print(can.recv(0))
can.send("abcd", -1, timeout=5000)
print(can.recv(0))
can.send("abcd", 0x7FF + 1, timeout=5000)
print(can.recv(0))
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# Test too long message
try:
can.send("abcdefghi", 0x7FF, timeout=5000)
except ValueError:
print("passed")
else:
print("failed")
# Test that recv can work without allocating memory on the heap
buf = bytearray(10)
l = [0, 0, 0, memoryview(buf)]
l2 = None
micropython.heap_lock()
can.send("", 42)
l2 = can.recv(0, l)
assert l is l2
print(l, len(l[3]), buf)
can.send("1234", 42)
l2 = can.recv(0, l)
assert l is l2
print(l, len(l[3]), buf)
can.send("01234567", 42)
l2 = can.recv(0, l)
assert l is l2
print(l, len(l[3]), buf)
can.send("abc", 42)
l2 = can.recv(0, l)
assert l is l2
print(l, len(l[3]), buf)
micropython.heap_unlock()
# Test that recv can work with different arrays behind the memoryview
can.send("abc", 1)
print(bytes(can.recv(0, [0, 0, 0, memoryview(array("B", range(8)))])[3]))
can.send("def", 1)
print(bytes(can.recv(0, [0, 0, 0, memoryview(array("b", range(8)))])[3]))
# Test for non-list passed as second arg to recv
can.send("abc", 1)
try:
can.recv(0, 1)
except TypeError:
print("TypeError")
# Test for too-short-list passed as second arg to recv
can.send("abc", 1)
try:
can.recv(0, [0, 0, 0])
except ValueError:
print("ValueError")
# Test for non-memoryview passed as 4th element to recv
can.send("abc", 1)
try:
can.recv(0, [0, 0, 0, 0])
except TypeError:
print("TypeError")
# Test for read-only-memoryview passed as 4th element to recv
can.send("abc", 1)
try:
can.recv(0, [0, 0, 0, memoryview(bytes(8))])
except ValueError:
print("ValueError")
# Test for bad-typecode-memoryview passed as 4th element to recv
can.send("abc", 1)
try:
can.recv(0, [0, 0, 0, memoryview(array("i", range(8)))])
except ValueError:
print("ValueError")
del can
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# Testing extended IDs
can = CAN(1, CAN.LOOPBACK, extframe=True)
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# Catch all filter
can.setfilter(0, CAN.MASK32, 0, (0, 0))
print(can)
try:
can.send("abcde", 0x7FF + 1, timeout=5000)
except ValueError:
print("failed")
else:
r = can.recv(0)
if r[0] == 0x7FF + 1 and r[3] == b"abcde":
print("passed")
else:
print("failed, wrong data received")
# Test filters
for n in [0, 8, 16, 24]:
filter_id = 0b00001000 << n
filter_mask = 0b00011100 << n
id_ok = 0b00001010 << n
id_fail = 0b00011010 << n
can.clearfilter(0)
can.setfilter(0, pyb.CAN.MASK32, 0, (filter_id, filter_mask))
can.send("ok", id_ok, timeout=3)
if can.any(0):
msg = can.recv(0)
print((hex(filter_id), hex(filter_mask), hex(msg[0]), msg[3]))
can.send("fail", id_fail, timeout=3)
if can.any(0):
msg = can.recv(0)
print((hex(filter_id), hex(filter_mask), hex(msg[0]), msg[3]))
del can
# Test RxCallbacks
can = CAN(1, CAN.LOOPBACK)
can.setfilter(0, CAN.LIST16, 0, (1, 2, 3, 4))
can.setfilter(1, CAN.LIST16, 1, (5, 6, 7, 8))
def cb0(bus, reason):
print("cb0")
if reason == 0:
print("pending")
if reason == 1:
print("full")
if reason == 2:
print("overflow")
def cb1(bus, reason):
print("cb1")
if reason == 0:
print("pending")
if reason == 1:
print("full")
if reason == 2:
print("overflow")
def cb0a(bus, reason):
print("cb0a")
if reason == 0:
print("pending")
if reason == 1:
print("full")
if reason == 2:
print("overflow")
def cb1a(bus, reason):
print("cb1a")
if reason == 0:
print("pending")
if reason == 1:
print("full")
if reason == 2:
print("overflow")
can.rxcallback(0, cb0)
can.rxcallback(1, cb1)
can.send("11111111", 1, timeout=5000)
can.send("22222222", 2, timeout=5000)
can.send("33333333", 3, timeout=5000)
can.rxcallback(0, cb0a)
can.send("44444444", 4, timeout=5000)
can.send("55555555", 5, timeout=5000)
can.send("66666666", 6, timeout=5000)
can.send("77777777", 7, timeout=5000)
can.rxcallback(1, cb1a)
can.send("88888888", 8, timeout=5000)
print(can.recv(0))
print(can.recv(0))
print(can.recv(0))
print(can.recv(1))
print(can.recv(1))
print(can.recv(1))
can.send("11111111", 1, timeout=5000)
can.send("55555555", 5, timeout=5000)
print(can.recv(0))
print(can.recv(1))
del can
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# Testing asynchronous send
can = CAN(1, CAN.LOOPBACK)
can.setfilter(0, CAN.MASK16, 0, (0, 0, 0, 0))
while can.any(0):
can.recv(0)
can.send("abcde", 1, timeout=0)
print(can.any(0))
while not can.any(0):
pass
print(can.recv(0))
try:
can.send("abcde", 2, timeout=0)
can.send("abcde", 3, timeout=0)
can.send("abcde", 4, timeout=0)
can.send("abcde", 5, timeout=0)
except OSError as e:
if str(e) == "16":
print("passed")
else:
print("failed")
pyb.delay(500)
while can.any(0):
print(can.recv(0))
# Testing rtr messages
bus1 = CAN(1, CAN.LOOPBACK)
while bus1.any(0):
bus1.recv(0)
bus1.setfilter(0, CAN.LIST16, 0, (1, 2, 3, 4))
bus1.setfilter(1, CAN.LIST16, 0, (5, 6, 7, 8), rtr=(True, True, True, True))
bus1.setfilter(2, CAN.MASK16, 0, (64, 64, 32, 32), rtr=(False, True))
bus1.send("", 1, rtr=True)
print(bus1.any(0))
bus1.send("", 5, rtr=True)
print(bus1.recv(0))
bus1.send("", 6, rtr=True)
print(bus1.recv(0))
bus1.send("", 7, rtr=True)
print(bus1.recv(0))
bus1.send("", 16, rtr=True)
print(bus1.any(0))
bus1.send("", 32, rtr=True)
print(bus1.recv(0))
# test HAL error, timeout
can = pyb.CAN(1, pyb.CAN.NORMAL)
try:
can.send("1", 1, timeout=50)
except OSError as e:
print(repr(e))