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#include "pcilib.h"
#include <Python.h>
#include "pci.h"
#include "error.h"
/*!
* \brief Global pointer to pcilib_t context.
* Used by __setPcilib and read_register.
*/
pcilib_t* __ctx = 0;
/*!
* \brief Wraps for pcilib_open function.
* \param[in] fpga_device path to the device file [/dev/fpga0]
* \param[in] model specifies the model of hardware, autodetected if NULL is passed
* \return Pointer to pcilib_t, created by pcilib_open, serialized to bytearray
*/
PyObject* __createPcilibInstance(const char *fpga_device, const char *model)
{
//opening device
pcilib_t* ctx = pcilib_open(fpga_device, model);
//serializing object
return PyByteArray_FromStringAndSize((const char*)&ctx, sizeof(pcilib_t*));
}
/*!
* \brief Sets pcilib context to wraper.
* \param[in] addr Pointer to pcilib_t, serialized to bytearray
*/
void __setPcilib(PyObject* addr)
{
if(!PyByteArray_Check(addr))
{
PyErr_SetString(PyExc_Exception, "Incorrect addr type. Only bytearray is allowed");
return NULL;
}
//deserializing adress
char* pAddr = PyByteArray_AsString(addr);
//hard copy context adress
for(int i = 0; i < sizeof(pcilib_t*) + 10; i++)
((char*)&__ctx)[i] = pAddr[i];
free(pAddr);
}
/*!
* \brief Reads register value.
* \param[in] regname the name of the register
* \param[in] bank should specify the bank name if register with the same name may occur in multiple banks, NULL otherwise
* \return register value, can be integer or float type
*/
PyObject* read_register(const char *regname, const char *bank)
{
if(!__ctx)
{
PyErr_SetString(PyExc_Exception, "pcilib_t handler not initialized");
return NULL;
}
pcilib_get_dma_description(__ctx);
pcilib_value_t val = {0};
pcilib_register_value_t reg_value;
int err;
err = pcilib_read_register(__ctx, bank, regname, ®_value);
if(err)
{
PyErr_SetString(PyExc_Exception, "Failed: read_register");
return NULL;
}
err = pcilib_set_value_from_register_value(__ctx, &val, reg_value);
if(err)
{
PyErr_SetString(PyExc_Exception, "Failed: pcilib_set_value_from_register_value");
return NULL;
}
switch(val.type)
{
case PCILIB_TYPE_INVALID:
PyErr_SetString(PyExc_Exception, "Invalid register output type (PCILIB_TYPE_INVALID)");
return NULL;
case PCILIB_TYPE_STRING:
PyErr_SetString(PyExc_Exception, "Invalid register output type (PCILIB_TYPE_STRING)");
return NULL;
case PCILIB_TYPE_LONG:
{
long ret;
ret = pcilib_get_value_as_int(__ctx, &val, &err);
if(err)
{
PyErr_SetString(PyExc_Exception, "Failed: pcilib_get_value_as_int");
return NULL;
}
return PyInt_FromLong((long) ret);
}
case PCILIB_TYPE_DOUBLE:
{
double ret;
ret = pcilib_get_value_as_float(__ctx, &val, &err);
if(err)
{
PyErr_SetString(PyExc_Exception, "Failed: pcilib_get_value_as_int");
return NULL;
}
return PyFloat_FromDouble((double) ret);
}
default:
PyErr_SetString(PyExc_Exception, "Invalid register output type (unknown)");
return NULL;
}
}
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