48 lines
985 B
Python
48 lines
985 B
Python
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import serial
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import struct
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import sys
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offset = 0x800
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tty = 'tty'
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baud = 115200
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chunksize = 128
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def write(s, offset, dat):
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for i in range(0, len(dat), chunksize):
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chunk = dat[i: i + chunksize]
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cmd = struct.pack('<cII', b'c', offset + i, len(chunk))
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print(f'Sending {len(chunk)} bytes @0x{offset + i:04x}')
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s.write(cmd)
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s.write(chunk)
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ack = s.read(2)
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if len(ack) < 2:
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raise RuntimeError(f'timeout waiting for full ack. got {ack}')
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if ack[0] != b'a'[0]:
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raise RuntimeError(f'expected ack, got this instead: {ack}')
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print(f'Ack! len={ack[1]}')
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def jump(s, offset):
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addr = struct.pack('<I', offset)
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s.write(b'j')
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s.write(addr)
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def main():
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binfile = sys.argv[1]
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with open(binfile, 'rb') as f:
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dat = f.read()
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s = serial.Serial(tty, baud, timeout=1)
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write(s, offset, dat)
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jump(s, offset)
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if __name__ == "__main__":
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main()
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