cp500.py

#!/usr/bin/env python
import serial  # pyserial
import fileinput

serial_opts = {
    # built-in serial port is "COM1"
    # USB serial port is "COM4"
    "port": "COM1",
    "baudrate": 9600,
    "parity": serial.PARITY_EVEN,
    "bytesize": serial.SEVENBITS,
    "xonxoff": False,
    "timeout": None
}

"""
NOTES:
Screen width: 40

Aux -> Setup
Password: 15732
-> Link:
    DNC Timeout (sec): 20
    ASCII Rewind: 26
    ASCII Dialog Start: 17
    ASCII Dialog Done: 19
    ASCII Dialog Prompt: 3
    ASCII Dialog Acknowledge: 62
    RS-232C baud rate: 9600
    Character Code: ASCII
        RS-244 character set == EIA == ???
    Parity: Even
    Transmit delay: 0
    Scan for ctrl-Z in download: Off
    Send EOT upon download fail: Off
    Download mem capacity as %: 30
    Autoreload point as %: 25
"""

XON = chr(17)
XOFF = chr(19)
DIALOG_START = XON
DIALOG_END = XOFF
DIALOG_SEND = "S"
DIALOG_RECV = "R"
DIALOG_PROMPT = chr(3)
DIALOG_ACK = chr(62)
FILE_START = chr(18)  # DC2?
FILE_END = chr(26)  # ctrl-z
LINE_FEED = chr(10)
CARRIAGE_RETURN = chr(13)

port = serial.Serial(**serial_opts)


def main():
    print "  Status: Waiting for host..."
    await(DIALOG_START)
    cmd = port.read(1)
    if cmd == DIALOG_SEND:
        port.write(LINE_FEED)
        # send response?
        print "  Status: Got download request"
        print "  Status: Starting dialog mode"
        # put any dialog prompts here
        print "  Status: Ending dialog mode, sending file"
        port.write(DIALOG_END)
        send_file()
    elif cmd == DIALOG_RECV:
        # receive command?
        pass


def send_file():
    # remote gobbles the first line... why?
    port.write(" "+LINE_FEED)
    await(DIALOG_ACK)
    b = 2
    for line in fileinput.input():
        line = line.strip()
        print "    File:", line
        port.write(line + LINE_FEED)
        b += len(line) + 1
        await(DIALOG_ACK)
    print "  Status: End of file, total", b, "bytes"
    fileinput.close()
    port.write(FILE_END)


def prompt(text):
    print "  Prompt:", text
    port.write(text + " ")
    port.write(DIALOG_PROMPT)
    response = await(CARRIAGE_RETURN)
    port.write(CARRIAGE_RETURN + LINE_FEED)
    print "Response:", response
    return response


def await(char):
    line = ""
    while True:
        c = port.read(1)
        if c == char:
            return line
            print "    RECV: %" % c.encode("dec")
        else:
            print "    RECV: % (unexpected)" % c.encode("dec")
        line += c


if __name__ == "__main__":
    main()
    print "\nPress a key to close."
    try:
        raw_input()
    except e:
        pass