File content as of revision 1:589beced7ccc:

# mbedRPC.py - mbed RPC interface for Python
#
##Copyright (c) 2010 ARM Ltd
##
##Permission is hereby granted, free of charge, to any person obtaining a copy
##of this software and associated documentation files (the "Software"), to deal
##in the Software without restriction, including without limitation the rights
##to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
##copies of the Software, and to permit persons to whom the Software is
##furnished to do so, subject to the following conditions:
## 
##The above copyright notice and this permission notice shall be included in
##all copies or substantial portions of the Software.
## 
##THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
##IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
##FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
##AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
##LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
##OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
##THE SOFTWARE.
#
# Example:
# >from mbedRPC import*
# >mbed = SerialRPC("COM5",9600)
# >myled = DigitalOut(mbed,"myled") <--- Where the text in quotations matches your RPC pin definition's second parameter, in this case it could be RpcDigitalOut myled(LED1,"myled");
# >myled.write(1)
# >

import serial, urllib2, time

# mbed super class
class mbed:
    def __init__(self):
        print("This will work as a demo but no transport mechanism has been selected")

    def rpc(self, name, method, args):
        print("Superclass method not overridden")


# Transport mechanisms, derived from mbed
class SerialRPC(mbed):
    def __init__(self, port, baud):
        self.ser = serial.Serial(port)
        self.ser.setBaudrate(baud)

    def rpc(self, name, method, args):
        # creates the command to be sent serially - /name/method arg1 arg2 arg3 ... argN
        str = "/" + name + "/" + method + " " + " ".join(args) + "\n"
        # prints the command being executed
        print str
        # writes the command to serial
        self.ser.write(str)
        # strips trailing characters from the line just written
        ret_val = self.ser.readline().strip()
        return ret_val


class HTTPRPC(mbed):
    def __init__(self, ip):
        self.host = "http://" + ip

    def rpc(self, name, method, args):
        response = urllib2.urlopen(self.host + "/rpc/" + name + "/" + method + "%20" + "%20".join(args))
        return response.read().strip()


# generic mbed interface super class
class mbed_interface():
    # initialize an mbed interface with a transport mechanism and pin name
    def __init__(self, this_mbed, mpin):
        self.mbed = this_mbed
        if isinstance(mpin, str):
            self.name = mpin

    def __del__(self):
        r = self.mbed.rpc(self.name, "delete", [])

    def new(self, class_name, name, pin1, pin2 = "", pin3 = ""):
        args = [arg for arg in [pin1,pin2,pin3,name] if arg != ""]
        r = self.mbed.rpc(class_name, "new", args)

    # generic read
    def read(self):
        r = self.mbed.rpc(self.name, "read", [])
        return int(r)


# for classes that need write functionality - inherits from the generic reading interface
class mbed_interface_write(mbed_interface):
    def __init__(self, this_mbed, mpin):
        mbed_interface.__init__(self, this_mbed, mpin)

    # generic write
    def write(self, value):
        r = self.mbed.rpc(self.name, "write", [str(value)])


# mbed interfaces
class DigitalOut(mbed_interface_write):
    def __init__(self, this_mbed, mpin):
        mbed_interface_write.__init__(self, this_mbed, mpin)


class AnalogIn(mbed_interface):
    def __init__(self, this_mbed, mpin):
        mbed_interface.__init__(self, this_mbed, mpin)

    def read_u16(self):
        r = self.mbed.rpc(self.name, "read_u16", [])
        return int(r)


class AnalogOut(mbed_interface_write):
    def __init__(self, this_mbed, mpin):
        mbed_interface_write.__init__(self, this_mbed, mpin)

    def write_u16(self, value):
        self.mbed.rpc(self.name, "write_u16", [str(value)])

    def read(self):
        r = self.mbed.rpc(self.name, "read", [])
        return float(r)


class DigitalIn(mbed_interface):
    def __init__(self, this_mbed, mpin):
        mbed_interface.__init__(self, this_mbed, mpin)


class PwmOut(mbed_interface_write):
    def __init__(self, this_mbed, mpin):
        mbed_interface_write.__init__(self, this_mbed, mpin)

    def read(self):
        r = self.mbed.rpc(self.name, "read", [])
        return r

    def period(self, value):
        self.mbed.rpc(self.name, "period", [str(value)])

    def period_ms(self, value):
        self.mbed.rpc(self.name, "period_ms", [str(value)])

    def period_us(self, value):
        self.mbed.rpc(self.name, "period_us", [str(value)])

    def pulsewidth(self, value):
        self.mbed.rpc(self.name, "pulsewidth", [str(value)])

    def pulsewidth_ms(self, value):
        self.mbed.rpc(self.name, "pulsewidth_ms", [str(value)])

    def pulsewidth_us(self, value):
        self.mbed.rpc(self.name, "pulsewidth_us", [str(value)])


class RPCFunction(mbed_interface):
    def __init__(self, this_mbed, name):
        mbed_interface.__init__(self, this_mbed, name)

    def run(self, input):
        r = self.mbed.rpc(self.name, "run", [input])
        return r


class RPCVariable(mbed_interface_write):
    def __init__(self, this_mbed, name):
        mbed_interface_write.__init__(self, this_mbed, name)

    def read(self):
        r = self.mbed.rpc(self.name, "read", [])
        return r

class Timer(mbed_interface):
    def __init__(self, this_mbed, name):
        mbed_interface.__init__(self, this_mbed, name)

    def start(self):
        r = self.mbed.rpc(self.name, "start", [])

    def stop(self):
        r = self.mbed.rpc(self.name, "stop", [])

    def reset(self):
        r = self.mbed.rpc(self.name, "reset", [])

    def read(self):
        r = self.mbed.rpc(self.name, "read", [])
        return float(re.search('\d+\.*\d*', r).group(0))

    def read_ms(self):
        r = self.mbed.rpc(self.name, "read_ms", [])
        return float(re.search('\d+\.*\d*', r).group(0))

    def read_us(self):
        r = self.mbed.rpc(self.name, "read_us", [])
        return float(re.search('\d+\.*\d*', r).group(0))

# Serial
class Serial():
    def __init__(self, this_mbed, tx, rx=""):
        self.mbed = this_mbed
        if isinstance(tx, str):
            self.name = tx

    def __del__(self):
        r = self.mbed.rpc(self.name, "delete", [])

    def baud(self, value):
        r = self.mbed.rpc(self.name, "baud", [str(value)])

    def putc(self, value):
        r = self.mbed.rpc(self.name, "putc", [str(value)])

    def puts(self, value):
        r = self.mbed.rpc(self.name, "puts", ["\"" + str(value) + "\""])

    def getc(self):
        r = self.mbed.rpc(self.name, "getc", [])
        return int(r)


def wait(s):
    time.sleep(s)