68 lines
1.6 KiB
Python
68 lines
1.6 KiB
Python
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"""This prints out all parsed ITM packets.
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Connect a USB to Serial converter to the SWO pin and then provide the serial
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device to this script. It should be 1MBaud SWO signal. CTRL-C when you've
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captured enough data and then it'll process and output.
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pip install pysigrok-libsigrokdecode
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python tools/swo_viewer.py /dev/ttyACM0
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"""
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import serial
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import sys
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import sigrokdecode
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import time
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import json
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decoder = sigrokdecode.get_decoder("arm_itm")()
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decoder.reset()
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decoder.options = {"objdump": "", "elffile": ""}
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decoder.start()
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dwt_timestamp = 0
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last_dwt_timestamp = 0
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streak = 0
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stack = []
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def decoder_cb(ss, es, data):
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global streak
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global last_dwt_timestamp
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print(dwt_timestamp, ss, es, data)
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decoder.add_callback(sigrokdecode.OUTPUT_ANN, None, decoder_cb)
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s = serial.Serial(sys.argv[-2], 1000000)
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buffers = []
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while True:
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try:
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start_ts = time.monotonic_ns()
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b = s.read(s.in_waiting)
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if b:
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end_ts = time.monotonic_ns()
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buffers.append((start_ts, end_ts, b))
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# print(len(b))
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# if len(buffers) > 10:
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# break
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except KeyboardInterrupt:
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break
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time_per_bit = 1_000_000_000 / 1000000
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min_gap = 100000000
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total_bytes = 0
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for start_ts, end_ts, buf in buffers:
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# print(total_bytes, start_ts, end_ts, buf)
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ts_per_byte = (end_ts - start_ts) / len(buf)
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for i, b in enumerate(buf):
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# print(total_bytes, hex(b))
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total_bytes += 1
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decoder.decode(
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start_ts + ts_per_byte * i, start_ts + ts_per_byte * (i + 1), ("DATA", None, (b,))
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)
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dwt_timestamp = decoder.dwt_timestamp
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