DNA Board Serial Command Demo

dna_board_serial_command_demo.py

#!/usr/bin/env python3
import serial, time, sys, binascii

PORT = '/dev/ttyACM0'   # change if needed
CMD  = b'P=GET SP\r\n'      # example command; use CRLF
TIMEOUT = 2.0            # seconds to wait for reply

def main():
    try:
        ser = serial.Serial(PORT, 115200, timeout=0.1)
    except Exception as e:
        print("Open error:", e); sys.exit(1)

    ser.reset_input_buffer()
    ser.reset_output_buffer()

    ser.write(CMD)
    ser.flush()
    print("Sent:", CMD)

    # read up to TIMEOUT seconds and collect bytes
    t0 = time.time()
    buf = bytearray()
    while time.time() - t0 < TIMEOUT:
        chunk = ser.read(4096)
        if chunk:
            buf.extend(chunk)
        else:
            time.sleep(0.01)

    ser.close()

    if not buf:
        print("No response within", TIMEOUT, "s")
    else:
        try:
            print("ASCII:", buf.decode('utf-8', errors='replace'))
        except:
            pass
        print("HEX:  ", binascii.hexlify(buf))

if __name__ == '__main__':
    main()