def testSendSpeedAndDetectAllBcm(self):
NUMBER_OF_FRAMES_TO_SEND = 1000 # Seems to give problems for larger values
self.simulated_can_process = subprocess.Popen(['candump', VIRTUAL_CAN_BUS_NAME,
"-n", str(NUMBER_OF_FRAMES_TO_SEND)],
shell=False, universal_newlines=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
time.sleep(0.1)
starttime = time.time()
for i in range(NUMBER_OF_FRAMES_TO_SEND):
signalvalues_to_send = {'testsignal1': 1,
'testsignal2': i,
'testsignal3': 256 * 4 + 5}
self.canbus_bcm.send_signals(signalvalues_to_send)
try:
self.simulated_can_process.communicate(timeout=10)
except subprocess.TimeoutExpired:
raise exceptions.CanTimeoutException("At least one of the {} sent frames was not seen by candump.".format(
NUMBER_OF_FRAMES_TO_SEND))
execution_time = time.time() - starttime
time_per_loop_ms = 1000 * execution_time / NUMBER_OF_FRAMES_TO_SEND
frames_per_seconds = NUMBER_OF_FRAMES_TO_SEND / execution_time
output_string = "\n --> Sent {} frames in {:.1f} s ({:.2f} ms per frame, {:.1f} frames/s). ".format(
NUMBER_OF_FRAMES_TO_SEND, execution_time, time_per_loop_ms, frames_per_seconds)
print(output_string)
def testReceiveAllSentFramesBcm(self):
self.canbus_bcm.init_reception()
self.simulated_can_process = subprocess.Popen(["cangen", VIRTUAL_CAN_BUS_NAME,
"-I", "{:3x}".format(FRAME_ID_RECEIVE),
"-L", str(self.FRAME_NUMBER_OF_DATABYTES),
"-D", "i",
"-g", str(self.FRAME_SENDER_SPACING_MILLISECONDS),
"-n", str(self.NUMBER_OF_LOOPS)],
shell=False, stderr=subprocess.STDOUT)
try:
for i in range(self.NUMBER_OF_LOOPS):
self.canbus_bcm.recv_next_signals()
except exceptions.CanTimeoutException:
raise exceptions.CanTimeoutException("Missed receiving at least one of the {} frames".format(
self.NUMBER_OF_LOOPS))