--- /dev/null
+# -*- coding: iso-8859-1 -*-\r
+\r
+##########################################################################\r
+# USPP Library (Universal Serial Port Python Library)\r
+#\r
+# Copyright (C) 2006 Isaac Barona <ibarona@gmail.com>\r
+# \r
+# This library is free software; you can redistribute it and/or\r
+# modify it under the terms of the GNU Lesser General Public\r
+# License as published by the Free Software Foundation; either\r
+# version 2.1 of the License, or (at your option) any later version.\r
+# \r
+# This library is distributed in the hope that it will be useful,\r
+# but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\r
+# Lesser General Public License for more details.\r
+\r
+# You should have received a copy of the GNU Lesser General Public\r
+# License along with this library; if not, write to the Free Software\r
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA\r
+##########################################################################\r
+\r
+#------------------------------------------------------------------------\r
+# Project: USPP Library (Universal Serial Port Python Library)\r
+# Name: SerialPort_linux.py\r
+# Purpose: Handle low level access to serial port in linux.\r
+#\r
+# Author: Isaac Barona Martinez <ibarona@gmail.com>\r
+# Copyright: (c) 2006 by Isaac Barona MartÃnez\r
+# Licence: LGPL\r
+#\r
+# Created: 26 June 2001\r
+# History:\r
+# 20 January 2002 : Damien Geranton <dgeranton@voila.fr>\r
+# - NCCS worry fixed. We must not use TERMIOS\r
+# - inWaiting call fixed.\r
+# 09 Sept 2005: Douglas Jones <dfj23@drexel.edu>\r
+# - readline method.\r
+#\r
+#-------------------------------------------------------------------------\r
+\r
+"""\r
+SerialPort_linux.py - Handle low level access to serial port in linux.\r
+\r
+See also uspp module docstring.\r
+\r
+\r
+"""\r
+\r
+import os\r
+from termios import *\r
+import fcntl\r
+import exceptions\r
+import struct\r
+import array\r
+\r
+\r
+class SerialPortException(exceptions.Exception):\r
+ """Exception raise in the SerialPort methods"""\r
+ def __init__(self, args=None):\r
+ self.args=args\r
+\r
+\r
+class SerialPort:\r
+ """Encapsulate methods for accesing to a serial port."""\r
+\r
+ BaudRatesDic={\r
+ 110: B110,\r
+ 300: B300,\r
+ 600: B600,\r
+ 1200: B1200,\r
+ 2400: B2400,\r
+ 4800: B4800, \r
+ 9600: B9600,\r
+ 19200: B19200,\r
+ 38400: B38400,\r
+ 57600: B57600,\r
+ 115200: B115200\r
+ }\r
+ buf = array.array('h', '\000'*4)\r
+\r
+ def __init__(self, dev, timeout=None, speed=None, mode='232', params=None):\r
+ """Open the serial port named by the string 'dev'\r
+\r
+ 'dev' can be any of the following strings: '/dev/ttyS0', '/dev/ttyS1',\r
+ ..., '/dev/ttySX' or '/dev/cua0', '/dev/cua1', ..., '/dev/cuaX'.\r
+ \r
+ 'timeout' specifies the inter-byte timeout or first byte timeout\r
+ (in miliseconds) for all subsequent reads on SerialPort.\r
+ If we specify None time-outs are not used for reading operations\r
+ (blocking reading).\r
+ If 'timeout' is 0 then reading operations are non-blocking. It\r
+ specifies that the reading operation is to return inmediately\r
+ with the bytes that have already been received, even if\r
+ no bytes have been received.\r
+ \r
+ 'speed' is an integer that specifies the input and output baud rate to\r
+ use. Possible values are: 110, 300, 600, 1200, 2400, 4800, 9600,\r
+ 19200, 38400, 57600 and 115200.\r
+ If None a default speed of 9600 bps is selected.\r
+ \r
+ 'mode' specifies if we are using RS-232 or RS-485. The RS-485 mode\r
+ is half duplex and use the RTS signal to indicate the\r
+ direction of the communication (transmit or recive).\r
+ Default to RS232 mode (at moment, only the RS-232 mode is\r
+ implemented).\r
+\r
+ 'params' is a list that specifies properties of the serial \r
+ communication.\r
+ If params=None it uses default values for the number of bits\r
+ per byte (8), the parity (NOPARITY) and the number of stop bits (1)\r
+ else params is the termios package mode array to use for \r
+ initialization.\r
+\r
+ """\r
+ self.__devName, self.__timeout, self.__speed=dev, timeout, speed\r
+ self.__mode=mode\r
+ self.__params=params\r
+ try:\r
+ self.__handle=os.open(dev, os.O_RDWR)\r
+ except:\r
+ raise SerialPortException('Unable to open port')\r
+\r
+ self.__configure()\r
+\r
+ def __del__(self):\r
+ """Close the serial port and restore its initial configuration\r
+ \r
+ To close the serial port we have to do explicity: del s\r
+ (where s is an instance of SerialPort)\r
+ """\r
+ \r
+ tcsetattr(self.__handle, TCSANOW, self.__oldmode)\r
+ \r
+ try:\r
+ os.close(self.__handle)\r
+ except IOError:\r
+ raise SerialPortException('Unable to close port')\r
+\r
+\r
+ def __configure(self):\r
+ """Configure the serial port.\r
+\r
+ Private method called in the class constructor that configure the \r
+ serial port with the characteristics given in the constructor.\r
+ """\r
+ if not self.__speed:\r
+ self.__speed=9600\r
+ \r
+ # Save the initial port configuration\r
+ self.__oldmode=tcgetattr(self.__handle)\r
+ if not self.__params:\r
+ # self.__params is a list of attributes of the file descriptor\r
+ # self.__handle as follows:\r
+ # [c_iflag, c_oflag, c_cflag, c_lflag, c_ispeed, c_ospeed, cc]\r
+ # where cc is a list of the tty special characters.\r
+ self.__params=[]\r
+ # c_iflag\r
+ self.__params.append(IGNPAR) \r
+ # c_oflag\r
+ self.__params.append(0) \r
+ # c_cflag\r
+ self.__params.append(CS8|CLOCAL|CREAD) \r
+ # c_lflag\r
+ self.__params.append(0) \r
+ # c_ispeed\r
+ self.__params.append(SerialPort.BaudRatesDic[self.__speed]) \r
+ # c_ospeed\r
+ self.__params.append(SerialPort.BaudRatesDic[self.__speed]) \r
+ cc=[0]*NCCS\r
+ if self.__timeout==None:\r
+ # A reading is only complete when VMIN characters have\r
+ # been received (blocking reading)\r
+ cc[VMIN]=1\r
+ cc[VTIME]=0\r
+ elif self.__timeout==0:\r
+ # Non-blocking reading. The reading operation returns\r
+ # inmeditately, returning the characters waiting to \r
+ # be read.\r
+ cc[VMIN]=0\r
+ cc[VTIME]=0\r
+ else:\r
+ # Time-out reading. For a reading to be correct\r
+ # a character must be recieved in VTIME*100 seconds.\r
+ cc[VMIN]=0\r
+ cc[VTIME]=self.__timeout/100\r
+ self.__params.append(cc) # c_cc\r
+ \r
+ tcsetattr(self.__handle, TCSANOW, self.__params)\r
+ \r
+\r
+ def fileno(self):\r
+ """Return the file descriptor for opened device.\r
+\r
+ This information can be used for example with the \r
+ select funcion.\r
+ """\r
+ return self.__handle\r
+\r
+\r
+ def __read1(self):\r
+ """Read 1 byte from the serial port.\r
+\r
+ Generate an exception if no byte is read and self.timeout!=0 \r
+ because a timeout has expired.\r
+ """\r
+ byte = os.read(self.__handle, 1)\r
+ if len(byte)==0 and self.__timeout!=0: # Time-out\r
+ raise SerialPortException('Timeout')\r
+ else:\r
+ return byte\r
+ \r
+\r
+ def read(self, num=1):\r
+ """Read num bytes from the serial port.\r
+\r
+ Uses the private method __read1 to read num bytes. If an exception\r
+ is generated in any of the calls to __read1 the exception is reraised.\r
+ """\r
+ s=''\r
+ for i in range(num):\r
+ s=s+SerialPort.__read1(self)\r
+ \r
+ return s\r
+\r
+\r
+ def readline(self):\r
+ """Read a line from the serial port. Returns input once a '\n'\r
+ character is found.\r
+ Douglas Jones (dfj23@drexel.edu) 09/09/2005.\r
+ """\r
+\r
+ s = ''\r
+ while not '\n' in s:\r
+ s = s+SerialPort.__read1(self)\r
+\r
+ return s \r
+\r
+ \r
+ def write(self, s):\r
+ """Write the string s to the serial port"""\r
+\r
+ os.write(self.__handle, s)\r
+\r
+ \r
+ def inWaiting(self):\r
+ """Returns the number of bytes waiting to be read"""\r
+ data = struct.pack("L", 0)\r
+ data=fcntl.ioctl(self.__handle, TIOCINQ, data)\r
+ return struct.unpack("L", data)[0]\r
+\r
+ def outWaiting(self):\r
+ """Returns the number of bytes waiting to be write\r
+ mod. by J.Grauheding\r
+ result needs some finetunning\r
+ """\r
+ rbuf=fcntl.ioctl(self.__handle, TIOCOUTQ, self.buf)\r
+ return rbuf\r
+\r
+ def getlsr(self):\r
+ """Returns the status of the UART LSR Register\r
+ J.Grauheding\r
+ """\r
+ rbuf=fcntl.ioctl(self.__handle, TIOCSERGETLSR, self.buf)\r
+ return ord(rbuf[0])\r
+\r
+ def get_temt(self):\r
+ """Returns the Tranmitterbuffer Empty Bit of LSR Register\r
+ J.Grauheding\r
+ test result against TIOCSER_TEMT\r
+ """\r
+ rbuf=fcntl.ioctl(self.__handle, TIOCSERGETLSR, self.buf)\r
+ return ord(rbuf[0]) & TIOSER_TEMT\r
+\r
+\r
+ def flush(self):\r
+ """Discards all bytes from the output or input buffer"""\r
+ tcflush(self.__handle, TCIOFLUSH)\r
+\r
+ def rts_on(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, SerialPort.buf)\r
+ SerialPort.buf[1] = ord(rbuf[3]) | TIOCM_RTS\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMSET, SerialPort.buf)\r
+ return rbuf\r
+\r
+ def rts_off(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, self.buf)\r
+ self.buf[1]=ord(rbuf[3]) & ~TIOCM_RTS\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMSET, self.buf)\r
+ return rbuf\r
+\r
+ def dtr_on(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, SerialPort.buf)\r
+ SerialPort.buf[1] = ord(rbuf[3]) | TIOCM_DTR\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMSET, SerialPort.buf)\r
+ return rbuf\r
+\r
+ def dtr_off(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, self.buf)\r
+ self.buf[1]=ord(rbuf[3]) & ~TIOCM_DTR\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMSET, self.buf)\r
+ return rbuf\r
+\r
+ def cts(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, self.buf)\r
+ return ord(rbuf[3]) & TIOCM_CTS\r
+\r
+ def cd(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, self.buf)\r
+ return ord(rbuf[3]) & TIOCM_CAR\r
+\r
+ def dsr(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, self.buf)\r
+ return ord(rbuf[2]) & (TIOCM_DSR>>8)\r
+\r
+ def ri(self):\r
+ """ J.Grauheding """\r
+ rbuf = fcntl.ioctl(self.__handle, TIOCMGET, self.buf)\r
+ return ord(rbuf[3]) & TIOCM_RNG\r
+\r
+ \r
+\r
--- /dev/null
+#!/usr/bin/env python
+import sys, time
+from SerialPort_linux import *
+
+# contains the last received checksum from a READ, WRITE or CHECKSUM command
+last_checksum = 0
+
+def sendByte(byte):
+ time.sleep(0.01) # just to get sure, wait 10ms
+ tty.write(chr(byte))
+ tty.flush()
+
+def sendWord(word):
+ sendByte(word & 0xFF)
+ sendByte((word >> 8) & 0xFF)
+
+def sendDWord(dword):
+ sendByte(dword & 0xFF)
+ sendByte((dword >> 8) & 0xFF)
+ sendByte((dword >> 16) & 0xFF)
+ sendByte((dword >> 24) & 0xFF)
+
+def recvByte():
+ return ord(tty.read())
+
+def recvChecksum():
+ global last_checksum
+ # get checksum
+ last_checksum = recvByte()
+ last_checksum |= (recvByte() << 8)
+
+def cmdREAD(address, size):
+ # send READ command
+ sendByte(0x01)
+ if (recvByte() != 0xF1):
+ raise Exception
+ sendByte(0x02)
+ if (recvByte() != 0x82):
+ raise Exception
+ # tell desired address and size
+ sendDWord(address)
+ sendWord(size)
+ # get binary stream of data
+ data = []
+ for i in range(0, size):
+ data.append(recvByte())
+ # get checksum
+ recvChecksum()
+ return data
+
+def cmdWRITE(address, size, data):
+ # send WRITE command
+ sendByte(0x01)
+ if (recvByte() != 0xF1):
+ raise Exception
+ sendByte(0x03)
+ if (recvByte() != 0x83):
+ raise Exception
+ # tell desired address and size
+ sendDWord(address)
+ sendWord(size)
+ # write binary stream of data
+ for i in range(0, size):
+ sendByte(data[i])
+ # get checksum
+ recvChecksum()
+
+def cmdBAUDRATE(baudrate):
+ global last_checksum
+
+ # send BAUDRATE command
+ sendByte(0x01)
+ if (recvByte() != 0xF1):
+ raise Exception
+ sendByte(0x06)
+ if (recvByte() != 0x86):
+ raise Exception
+ # send desired baudrate
+ sendByte(baudrate & 0xFF)
+ sendByte((baudrate >> 8) & 0xFF)
+ sendByte((baudrate >> 16) & 0xFF)
+ sendByte((baudrate >> 24) & 0xFF)
+
+print "Initializing serial port..."
+tty = SerialPort("/dev/ttyUSB0", 100, 9600)
+
+print "Please press RESET on your 1337 board..."
+
+while 1:
+ tty.write('V')
+ tty.flush()
+ try:
+ if tty.read() == 'F':
+ break
+ except SerialPortException:
+ # timeout happened, who cares ;-)
+ pass
+
+print "OK, trying to set baudrate..."
+
+# set baudrate
+cmdBAUDRATE(19200)
+tty = SerialPort("/dev/ttyUSB0", 100, 19200)
+
+print
+
+# write something to the begin of the IRAM
+data = [255, 2, 3, 4]
+print "Writing", data, "to the IRAM..."
+cmdWRITE(0x00030000, 4, data)
+print "Received Checksum:", last_checksum
+print
+
+print "Reading from the IRAM again..."
+data2 = cmdREAD(0x00030000, 4)
+print "Received data:", data2, "Checksum:", last_checksum
projects / pyfrprog.git / commitdiff