94 lines
2.8 KiB
Python
94 lines
2.8 KiB
Python
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from artiq.experiment import *
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import numpy as np
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class TtlTests(EnvExperiment):
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def build(self):
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self.setattr_device("core")
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self.ttlio = self.get_device("ttl0")
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@kernel
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def bisect_underflow(self, f, t_max_mu=1000, t_min_mu=0):
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t = 0
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while (t_max_mu-t_min_mu) > 1:
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t = np.int64( (t_max_mu+t_min_mu)/2 )
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print(np.int32(t_min_mu), np.int32(t_max_mu))
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try:
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f(t)
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except RTIOUnderflow:
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print("Underflow")
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if t == t_max_mu:
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raise ValueError("Upper bound underflowed")
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t_min_mu = t
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else:
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t_max_mu = t
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return t
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@kernel
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def test_input_operation(self):
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core_log("")
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core_log("Test input operation ...")
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self.core.reset()
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self.ttlio.output()
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delay(10*us)
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with parallel:
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self.ttlio.gate_rising(10*us)
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with sequential:
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delay(1*us)
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t_out_mu = now_mu()
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self.ttlio.pulse(1*us)
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t_in_mu = self.ttlio.timestamp_mu()
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dt = np.int32(t_in_mu-t_out_mu)
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core_log("t_in-t_out:", dt, "mu")
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@kernel
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def event_response(self):
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"""How soon after an input event can we reliably schedule an output event"""
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core_log("")
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core_log("Measuring minimum event response time")
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t = 0
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def f(t_delay):
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self.core.reset()
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self.ttlio.output()
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delay(1*us)
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for i in range(10):
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# Make sure we have plenty of slack
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delay(1000*us)
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self.ttlio.off()
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delay(1*us)
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with parallel:
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self.ttlio.gate_rising(4*us)
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with sequential:
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delay(100*ns)
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self.ttlio.pulse(100*ns)
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t_input = self.ttlio.timestamp_mu()
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at_mu(t_input+t_delay)
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self.ttlio.pulse(10*us)
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t = self.bisect_underflow(lambda t: f(t), t_max_mu=10000)
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core_log("Event response time: ", np.int32(t), "mu")
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@kernel
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def output_pulse_rate(self):
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"""Sustained TTL output pulse rate"""
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core_log("")
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core_log("Measuring sustained output pulse rate")
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t=0
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def f(t):
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self.core.break_realtime()
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for i in range(20000):
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delay_mu(t)
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self.ttlio.pulse_mu(t)
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t = self.bisect_underflow(lambda t: f(t), t_max_mu=1000)
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core_log("Sustained pulse rate: ", np.int32(2*t), "mu")
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@kernel
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def run(self):
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self.core.reset()
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self.test_input_operation()
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self.output_pulse_rate()
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self.event_response()
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