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decoder.cpp
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decoder.cpp
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#include "Python.h"
#include <string>
#include <iostream>
#include <stdlib.h>
#include <time.h>
#include "wiringPi.h"
#include "RCSwitch.h"
#include "RcOok.h"
using namespace std;
static int do_exit = 0;
static int initalized = 0;
RCSwitch *rc;
/*
read433 - Function for reading directly from an RTL-SDR and returning a list of
Manchester decoded bits.
*/
static PyObject *read433(PyObject *self, PyObject *args, PyObject *kwds) {
PyObject *output, *bits, *temp, *temp2, *temp2a, *temp2b, *temp3;
long inputPin, duration, verbose, tStart, nMessage, i;
struct sigaction sigact;
char message[RCSWITCH_MAX_MESS_SIZE];
char messages[1024][RCSWITCH_MAX_MESS_SIZE];
verbose = 0;
static char *kwlist[] = {"inputPin", "duration", NULL};
if( !PyArg_ParseTupleAndKeywords(args, kwds, "ii", kwlist, &inputPin, &duration) ) {
PyErr_Format(PyExc_RuntimeError, "Invalid parameters");
return NULL;
}
// Validate the input
if( duration <= 0 ) {
PyErr_Format(PyExc_ValueError, "Duration value must be greater than zero");
return NULL;
}
// Setup the 433 MHz receiver if needed
if( !initalized ) {
if(wiringPiSetupSys() == -1) {
PyErr_Format(PyExc_RuntimeError, "Cannot initialize the wiringPi library");
return NULL;
}
if( initalized != inputPin ) {
rc = new RCSwitch(inputPin,-1);
}
initalized = (int) inputPin;
}
// Go
Py_BEGIN_ALLOW_THREADS
nMessage = 0;
tStart = (long) time(NULL);
while ((long) time(NULL) - tStart < duration && !do_exit) {
//// Check for a message
if ( rc->OokAvailable() ) {
rc->getOokCode(message);
if( verbose ) {
cout << message << "\n" << flush;
}
strcpy(messages[nMessage], message);
nMessage += 1;
if( nMessage == 1024 ) {
duration = 0;
}
}
//// Wait a bit (~1 ms)
usleep(1000);
}
Py_END_ALLOW_THREADS
// Shutdown the receiver
rc->disableReceive();
// Setup the output list
bits = PyList_New(0);
for(i=0; i<nMessage; i++) {
strcpy(message, messages[i]);
temp = PyString_FromString(message);
temp2 = PyObject_CallMethod(temp, "split", "(si)", " ", 1);
temp2a = PyList_GetItem(temp2, (Py_ssize_t) 0);
temp2b = PyList_GetItem(temp2, (Py_ssize_t) 1);
temp3 = PyTuple_Pack((Py_ssize_t) 2, temp2a, temp2b);
PyList_Append(bits, temp3);
Py_DECREF(temp);
Py_DECREF(temp2);
Py_DECREF(temp3);
}
// Return
output = Py_BuildValue("O", bits);
return output;
}
PyDoc_STRVAR(read433_doc, \
"Read in the data from a 433 MHz receiver device and perform Manchester\n\
decoding, and return a list of strings for each packet received that is\n\
suitable for identifying Oregon Scientific v2.1 and v3.0 sensor data.\n\
\n\
Inputs:\n\
* inputPin - GPIO pin on the Raspberry Pi to use\n\
* duration - integer number of seconds to capture data for\n\
\n\
Outputs:\n\
* packets - a list of two-element tuples containing the protocol and\n\
the packat data-header as a hex string\n\
\n\
Based on:\n\
* http://www.osengr.org/WxShield/Downloads/OregonScientific-RF-Protocols-II.pdf\n\
* http://www.disk91.com/2013/technology/hardware/oregon-scientific-sensors-with-raspberry-pi/\n\
* https://github.com/daveblackuk/RPI_Oregan.git\n\
");
/*
Module Setup - Function Definitions and Documentation
*/
static PyMethodDef DecoderMethods[] = {
{"read433", (PyCFunction) read433, METH_VARARGS | METH_KEYWORDS, read433_doc},
{NULL, NULL, 0, NULL}
};
PyDoc_STRVAR(Decoder_doc, \
"Module to read in and Manchester decode Oregon Scientific v2.1 and v3.0 weather\n\
station data.");
/*
Module Setup - Initialization
*/
PyMODINIT_FUNC initdecoder(void) {
PyObject *m;
// Module definitions and functions
m = Py_InitModule3("decoder", DecoderMethods, Decoder_doc);
// Version and revision information
PyModule_AddObject(m, "__version__", PyString_FromString("0.2"));
}