I need information about extending and embedding Python

[Fredrik Lundh]

Cesar Lopez <clopez at abo.fi> wrote:
> I need to make a library for python to update some external devices in
> an embeded system with a little Hitachi microcontroller, so I need
> information about How to do that, I must to define a method to define
> librarys to control devices like, RS-232 port, Leds, Keyboards,
> Speakers.
>
> Now I´ve defined a litle program in C++, its control a green Led
> (on/off) and now I want to do that with the python interpreter, so I
> need your help.

here's an example (in plain old C):

---

#include "Python.h"

static PyObject *
device_set(PyObject* self, PyObject* args)
{
    int status;

    int value;
    if (!PyArg_ParseTuple(args, "i", &value))
        return NULL;

    /* do something! */
    status = whatever(value);

    return Py_BuildValue("i", status);
}

static PyMethodDef _functions[] = {
    {"set", device_set, 1},
    {NULL, NULL}
};

void
#ifdef WIN32
__declspec(dllexport)
#endif
initdevice()
{
    Py_InitModule("device", _functions);
}

---

import device
device.set(1) # switch it on!

---

for more info, see:

"Extending and Embedding the Python Interpreter"
http://www.python.org/doc/current/ext/ext.html

"Python/C API Reference Manual"
http://www.python.org/doc/current/api/api.html

and all the existing modules in the standard
library...

</F>