Matthias Blankertz
7f8282315e
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The python and C modules that are supposed to be built into the firmware image (i.e. those that are in manifest.py or in USER_C_MODULES) have been moved to the software/modules directory. The software/src directory should now only contain python scripts and other files that should be installed to the Picos flash filesystem. The idea is that these should be those scripts that implement the application behaviour, as these are the ones that a user who does not want to build the whole firmware themself wants to modify.
74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
from mfrc522 import MFRC522
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import asyncio
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import time
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delay_sum = 0
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delay_count = 0
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max_delay = 0
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async def latency_test():
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global delay_sum
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global delay_count
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global max_delay
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global min_delay
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min_delay = 0xffffffff
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await asyncio.sleep_ms(1)
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while True:
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for _ in range(2000):
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before = time.ticks_us()
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await asyncio.sleep(0)
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after = time.ticks_us()
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delay = after - before
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delay_sum += delay
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delay_count += 1
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if delay > max_delay:
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max_delay = delay
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if delay < min_delay:
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min_delay = delay
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await asyncio.sleep_ms(1)
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print(f"delay (min / max / avg) [µs]: ({min_delay} / {max_delay} / {delay/delay_sum})")
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def uid_to_string(uid: list):
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return '0x' + ''.join(f'{i:02x}' for i in uid)
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async def get_tag_uid(reader: MFRC522, poll_interval_ms: int = 50) -> list:
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'''
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The maximum measured delay with poll_interval_ms=50 and a reader with tocard_retries=5 is
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15.9 ms:
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delay (min / max / avg) [µs]: (360 / 15945 / 1.892923e-06)
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The maximum measured delay dropped to 11.6 ms by setting tocard_retries=1:
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delay (min / max / avg) [µs]: (368 / 11696 / 6.204211e-06)
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'''
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while True:
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reader.init()
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# For now we omit the tag type
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(stat, _) = reader.request(reader.REQIDL)
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if stat == reader.OK:
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(stat, uid) = reader.SelectTagSN()
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if stat == reader.OK:
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print(f"uid={uid_to_string(uid)}")
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await asyncio.sleep_ms(poll_interval_ms)
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def main():
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reader = MFRC522(spi_id=1, sck=10, miso=12, mosi=11, cs=13, rst=9, tocard_retries=1)
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print("")
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print("Please place card on reader")
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print("")
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asyncio.create_task(get_tag_uid(reader))
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asyncio.create_task(latency_test())
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asyncio.get_event_loop().run_forever()
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if __name__ == "__main__":
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main()
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