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88 lines
2.1 KiB
88 lines
2.1 KiB
#!/usr/bin/env python3
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import json
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import time
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import threading
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from panda import Panda
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def drain_serial(p):
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ret = []
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while True:
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d = p.serial_read(0)
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if len(d) == 0:
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break
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ret.append(d)
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return ret
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fan_cmd = 0.
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def logger(event):
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# requires a build with DEBUG_FAN
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with Panda(claim=False) as p, open('/tmp/fan_log', 'w') as f:
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power = None
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target_rpm = None
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stall_count = None
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rpm_fast = None
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t = time.monotonic()
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drain_serial(p)
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while not event.is_set():
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p.set_fan_power(fan_cmd)
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for l in drain_serial(p)[::-1]:
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ns = l.decode('utf8').strip().split(' ')
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if len(ns) == 4:
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target_rpm, rpm_fast, power, stall_count = (int(n, 16) for n in ns)
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break
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dat = {
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't': time.monotonic() - t,
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'cmd_power': fan_cmd,
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'pwm_power': power,
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'target_rpm': target_rpm,
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'rpm_fast': rpm_fast,
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'rpm': p.get_fan_rpm(),
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'stall_counter': stall_count,
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'total_stall_count': p.health()['fan_stall_count'],
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}
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f.write(json.dumps(dat) + '\n')
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time.sleep(1/16.)
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p.set_fan_power(0)
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def get_overshoot_rpm(p, power):
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global fan_cmd
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# make sure the fan is stopped completely
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fan_cmd = 0.
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while p.get_fan_rpm() > 100:
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time.sleep(0.1)
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time.sleep(3)
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# set it to 30% power to mimic going onroad
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fan_cmd = power
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max_rpm = 0
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max_power = 0
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for _ in range(70):
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max_rpm = max(max_rpm, p.get_fan_rpm())
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max_power = max(max_power, p.health()['fan_power'])
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time.sleep(0.1)
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# tolerate 10% overshoot
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expected_rpm = Panda.MAX_FAN_RPMs[bytes(p.get_type())] * power / 100
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overshoot = (max_rpm / expected_rpm) - 1
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return overshoot, max_rpm, max_power
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if __name__ == "__main__":
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event = threading.Event()
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threading.Thread(target=logger, args=(event, )).start()
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try:
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p = Panda()
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for power in range(10, 101, 10):
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overshoot, max_rpm, max_power = get_overshoot_rpm(p, power)
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print(f"Fan power {power}%: overshoot {overshoot:.2%}, Max RPM {max_rpm}, Max power {max_power}%")
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finally:
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event.set()
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