tools/flterm.py

   1 #!/usr/bin/env python3
   2 import sys, os, time, serial, threading, argparse
   3 from serial.tools.miniterm import console, character, LF
   4
   5 sfl_magic_len = 14
   6 sfl_magic_req = "sL5DdSMmkekro\n"
   7 sfl_magic_ack = "z6IHG7cYDID6o\n"
   8
   9 # General commands
  10 sfl_cmd_abort = 0x00
  11 sfl_cmd_load = 0x01
  12 sfl_cmd_jump = 0x02
  13
  14 # Replies
  15 sfl_ack_success = 'K'
  16 sfl_ack_crcerror = 'C'
  17 sfl_ack_unknown = 'U'
  18 sfl_ack_error = 'E'
  19
  20 # XXX : can we get CRC16 from a standard Python library as it's done
  21 # for CRC32 with binascii?
  22 crc16_table = [
  23     0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
  24     0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
  25     0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
  26     0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
  27     0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
  28     0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
  29     0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
  30     0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
  31     0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
  32     0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
  33     0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
  34     0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
  35     0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
  36     0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
  37     0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
  38     0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
  39     0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
  40     0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
  41     0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
  42     0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
  43     0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
  44     0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
  45     0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
  46     0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
  47     0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
  48     0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
  49     0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
  50     0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
  51     0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
  52     0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
  53     0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
  54     0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
  55 ]
  56
  57
  58 def crc16(l):
  59     crc = 0
  60     for d in l:
  61         crc = crc16_table[((crc >> 8) ^ d) & 0xff] ^ (crc << 8)
  62     return crc
  63
  64
  65 class SFLFrame:
  66     def __init__(self):
  67         self.length = None
  68         self.cmd = None
  69         self.payload = []
  70         self.crc = None
  71         self.raw = []
  72
  73     def compute_crc(self):
  74         crc_data = []
  75         crc_data.append(self.cmd)
  76         for d in self.payload:
  77             crc_data.append(d)
  78         self.crc = crc16(crc_data)
  79         return self.crc
  80
  81     def encode(self):
  82         self.raw = []
  83         self.raw.append(self.length)
  84         self.compute_crc()
  85         self.raw.append((self.crc & 0xff00) >> 8)
  86         self.raw.append(self.crc & 0x00ff)
  87         self.raw.append(self.cmd)
  88         for d in self.payload:
  89             self.raw.append(d)
  90
  91
  92 def get_file_data(filename):
  93     with open(filename, "rb") as f:
  94         data = []
  95         while True:
  96             w = f.read(1)
  97             if not w:
  98                 break
  99             data.append(int.from_bytes(w, "big"))
 100     return data
 101
 102
 103 class Flterm:
 104     def __init__(self, kernel_image, kernel_address):
 105         self.kernel_image = kernel_image
 106         self.kernel_address = kernel_address
 107
 108         self.reader_alive = False
 109         self.writer_alive = False
 110
 111         self.detect_magic_str = " "*len(sfl_magic_req)
 112
 113     def open(self, port, speed):
 114         port = port if not port.isdigit() else int(port)
 115         self.serial = serial.Serial(port, speed, timeout=0.25)
 116         self.serial.flushOutput()
 117         self.serial.flushInput()
 118         self.serial.close() # in case port was not correctly closed
 119         self.serial.open()
 120
 121     def close(self):
 122         self.serial.close()
 123
 124     def write_exact(self, data):
 125         if isinstance(data, str):
 126             self.serial.write(bytes(data, "utf-8"))
 127         else:
 128             self.serial.write(serial.to_bytes(data))
 129
 130     def send_frame(self, frame):
 131         frame.encode()
 132         retry = 1
 133         while retry:
 134             self.write_exact(frame.raw)
 135             # Get the reply from the device
 136             reply = character(self.serial.read())
 137             if reply == sfl_ack_success:
 138                 retry = 0
 139             elif reply == sfl_ack_crcerror:
 140                 retry = 1
 141             else:
 142                 print("[FLTERM] Got unknown reply '{}' from the device, aborting.".format(reply))
 143                 return 0
 144         return 1
 145
 146     def upload(self, filename, address):
 147         data = get_file_data(filename)
 148         print("[FLTERM] Uploading {} ({} bytes)...".format(filename, len(data)))
 149         current_address = address
 150         position = 0
 151         length = len(data)
 152         start = time.time()
 153         while len(data) != 0:
 154             print("{}%\r".format(100*position//length), end="")
 155             frame = SFLFrame()
 156             if len(data) > 251:
 157                 frame_data = data[:251]
 158             frame.length = len(frame_data)+4
 159             frame.cmd = sfl_cmd_load
 160             frame.payload.append((current_address & 0xff000000) >> 24)
 161             frame.payload.append((current_address & 0x00ff0000) >> 16)
 162             frame.payload.append((current_address & 0x0000ff00) >> 8)
 163             frame.payload.append((current_address & 0x000000ff) >> 0)
 164             for d in frame_data:
 165                 frame.payload.append(d)
 166             if self.send_frame(frame) == 0:
 167                 return
 168             current_address += len(frame_data)
 169             position += len(frame_data)
 170             try:
 171                 data = data[251:]
 172             except:
 173                 data = []
 174         end = time.time()
 175         elapsed = end - start
 176         print("[FLTERM] Upload complete ({0:.1f}KB/s).".format(length/(elapsed*1024)))
 177         return length
 178
 179     def boot(self):
 180         print("[FLTERM] Booting the device.")
 181         frame = SFLFrame()
 182         frame.length = 4
 183         frame.cmd = sfl_cmd_jump
 184         frame.payload.append((self.kernel_address & 0xff000000) >> 24)
 185         frame.payload.append((self.kernel_address & 0x00ff0000) >> 16)
 186         frame.payload.append((self.kernel_address & 0x0000ff00) >> 8)
 187         frame.payload.append((self.kernel_address & 0x000000ff) >> 0)
 188         self.send_frame(frame)
 189
 190     def detect_magic(self, data):
 191         if data is not "":
 192             self.detect_magic_str = self.detect_magic_str[1:] + data
 193             return self.detect_magic_str == sfl_magic_req
 194         else:
 195             return False
 196
 197     def answer_magic(self):
 198         print("[FLTERM] Received firmware download request from the device.")
 199         if os.path.exists(self.kernel_image):
 200             self.write_exact(sfl_magic_ack)
 201             self.upload(self.kernel_image, self.kernel_address)
 202             self.boot()
 203         print("[FLTERM] Done.");
 204
 205     def reader(self):
 206         try:
 207             while self.reader_alive:
 208                 c = character(self.serial.read())
 209                 if c == '\r':
 210                     sys.stdout.write('\n')
 211                 else:
 212                     sys.stdout.write(c)
 213                 sys.stdout.flush()
 214
 215                 if self.kernel_image is not None:
 216                     if self.detect_magic(c):
 217                         self.answer_magic()
 218
 219         except serial.SerialException:
 220             self.reader_alive = False
 221             raise
 222
 223     def start_reader(self):
 224         self.reader_alive = True
 225         self.reader_thread = threading.Thread(target=self.reader)
 226         self.reader_thread.setDaemon(True)
 227         self.reader_thread.start()
 228
 229     def stop_reader(self):
 230         self.reader_alive = False
 231         self.reader_thread.join()
 232
 233     def writer(self):
 234         try:
 235             while self.writer_alive:
 236                 try:
 237                     b = console.getkey()
 238                 except KeyboardInterrupt:
 239                     b = serial.to_bytes([3])
 240                 c = character(b)
 241                 if c == chr(0x03):
 242                     self.stop()
 243                 elif c == '\n':
 244                     self.serial.write(LF)
 245                 else:
 246                     self.serial.write(b)
 247         except:
 248             self.writer_alive = False
 249             raise
 250
 251     def start_writer(self):
 252         self.writer_alive = True
 253         self.writer_thread = threading.Thread(target=self.writer)
 254         self.writer_thread.setDaemon(True)
 255         self.writer_thread.start()
 256
 257     def stop_writer(self):
 258         self.writer_alive = False
 259         self.writer_thread.join()
 260
 261     def start(self):
 262         print("[FLTERM] Starting....")
 263         self.start_reader()
 264         self.start_writer()
 265
 266     def stop(self):
 267         self.reader_alive = False
 268         self.writer_alive = False
 269
 270     def join(self, writer_only=False):
 271         self.writer_thread.join()
 272         if not writer_only:
 273             self.reader_thread.join()
 274
 275
 276 def _get_args():
 277     parser = argparse.ArgumentParser()
 278     parser.add_argument("--port", default="2", help="serial port")
 279     parser.add_argument("--speed", default=115200, help="serial baudrate")
 280     parser.add_argument("--kernel", default=None, help="kernel image")
 281     parser.add_argument("--kernel_adr", default=0x40000000, help="kernel address")
 282     return parser.parse_args()
 283
 284 if __name__ == "__main__":
 285     args = _get_args()
 286     flterm = Flterm(args.kernel, args.kernel_adr)
 287     flterm.open(args.port, args.speed)
 288     flterm.start()
 289     try:
 290         flterm.join(True)
 291     except KeyboardInterrupt:
 292         pass
 293     flterm.join()