28 lines
893 B
Python
28 lines
893 B
Python
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import xmostest
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class UARTClockDevice(xmostest.SimThread):
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def __init__(self, clock_port, clock_frequency):
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"""
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Create a clock input to a given port for the XCore.
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:param: clock_port Port to clock
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:param: clock_frequency Frequency in Hz of the clock
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"""
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self._clock_port = clock_port
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self._clock_frequency = clock_frequency
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def run(self):
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xsi = self.xsi
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time = xsi.get_time()
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# (1s/(freq))/2 = T for 1 edge. 1s = 1e9ns, 0.5s = 5e8ns
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half_period_ns = float(5e8) / self._clock_frequency
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while True:
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xsi.drive_port_pins(self._clock_port, 1)
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self.wait_until(time + half_period_ns)
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time += half_period_ns
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xsi.drive_port_pins(self._clock_port, 0)
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self.wait_until(time + half_period_ns)
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time += half_period_ns
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