75 lines
3.2 KiB
Python
75 lines
3.2 KiB
Python
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# Copyright 2015-2021 XMOS LIMITED.
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# This Software is subject to the terms of the XMOS Public Licence: Version 1.
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import xmostest
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class GPIOBasicChecker(xmostest.SimThread):
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"""
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This simulator thread will read and write to pins.
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"""
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def __init__(self, mode, test_port, expected_test_port_data, num_clients,
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trigger_port = None):
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self._mode = mode
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if self._mode != 'input' and self._mode != 'output':
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print("ERROR: Checker initialised in unsupported mode %s" %
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(self._mode))
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self._test_port = test_port
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self._expected_test_port_data = expected_test_port_data
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self._num_clients = num_clients
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self._trigger_port = trigger_port
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print("Checking %s on port %s with %d clients" % (self._mode,
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self._test_port, self._num_clients))
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if self._trigger_port != None:
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print("Using port %s as trigger" % (self._trigger_port))
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def drive_port(self, xsi):
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# Check the xCORE is not trying to drive the port
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if xsi.is_port_driving(self._test_port):
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print("ERROR: xCORE driving port %s which expected to be input only"
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% (self._test_port))
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# Drive the port
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xsi.drive_port_pins(self._test_port, self._expected_test_port_data)
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print("Checker driving port")
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def read_port(self, xsi):
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pin_values = []
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for client in range(0, self._num_clients):
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pin_values.append(-1)
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correct_pin_count = 0
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while (correct_pin_count < self._num_clients):
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# Wait for the xCORE to drive the port
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self.wait_for_port_pins_change([self._test_port])
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port_data = xsi.sample_port_pins(self._test_port)
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for client in range(0, self._num_clients):
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# Check for the updated pin
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pin_data = ((port_data >> client) & 1)
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if pin_values[client] == -1:
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# Not yet seen the correct pin data yet
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if pin_data == ((self._expected_test_port_data >>
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client) & 1):
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pin_values[client] = pin_data
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correct_pin_count +=1
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print("Checker has seen correct value on pin %d " %
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(client))
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else: # Check valid pin data has not been overwritten
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if pin_values[client] != ((self._expected_test_port_data >>
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client) & 1):
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print("ERROR: Data on pin %d changed unexpected" %
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(client))
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print("Checker has seen all pins change")
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# Drive trigger port to allow xCORE program to terminate
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xsi.drive_port_pins(self._trigger_port, 1)
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print("Checker driving termination trigger")
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def run(self):
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if self._mode == 'input':
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# xCORE testing 'input' functionality means checker must drive port
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self.drive_port(self.xsi)
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elif self._mode == 'output':
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# xCORE testing 'output' functionality means checker must read port
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self.read_port(self.xsi)
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print("Checker complete")
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