extern size_t ciaaLibs_circBufWriteTo(ciaaLibs_CircBufType * cbuf, int32_t filDes, size_t nbytes)
{
size_t rawCount;
/* the tail of the circular buffer my be changed, therefore it has to be
* read only once */
size_t tail = cbuf->tail;
/* if the users tries to read to much data, only available data will be
* provided */
if (nbytes > ciaaLibs_circBufCount(cbuf, tail))
{
nbytes = ciaaLibs_circBufCount(cbuf, tail);
}
/* check if data to be read */
if (nbytes > 0)
{
rawCount = ciaaLibs_circBufRawCount(cbuf, tail);
/* check if all data can be read without wrapping */
if (nbytes <= rawCount)
{
ciaaPOSIX_write(filDes, ciaaLibs_circBufReadPos(cbuf), nbytes);
}
else
{
ciaaPOSIX_write(filDes, ciaaLibs_circBufReadPos(cbuf), rawCount);
ciaaPOSIX_write(filDes, (void*)(&cbuf->buf[0]), nbytes-rawCount);
}
}
return nbytes;
} /* end ciaaLibs_circBufWriteTo */
extern void ciaaSerialDevices_txConfirmation(ciaaDevices_deviceType const * const device, uint32_t const nbyte)
{
/* get serial device */
ciaaSerialDevices_deviceType * serialDevice =
(ciaaSerialDevices_deviceType*) device->layer;
uint32_t write = 0;
ciaaLibs_CircBufType * cbuf = &serialDevice->txBuf;
uint32_t tail = cbuf->tail;
uint32_t rawCount = ciaaLibs_circBufRawCount(cbuf, tail);
uint32_t count = ciaaLibs_circBufCount(cbuf, tail);
TaskType taskID = serialDevice->blocked.taskID;
/* if some data have to be transmitted */
if (count > 0)
{
/* write data to the driver */
write = serialDevice->device->write(device->loLayer, ciaaLibs_circBufReadPos(cbuf), rawCount);
/* update buffer */
ciaaLibs_circBufUpdateHead(cbuf, write);
/* if all bytes were written and more data is available */
if ( (write == rawCount) && (count > rawCount ) )
{
/* re calculate rawCount */
rawCount = ciaaLibs_circBufRawCount(cbuf, tail);
/* write more bytes */
write = serialDevice->device->write(device->loLayer,
ciaaLibs_circBufReadPos(cbuf), rawCount);
if (write > 0)
{
/* update buffer */
ciaaLibs_circBufUpdateHead(cbuf, write);
}
}
/* if task is blocked and waiting for reception of this device */
if ( (255 != taskID) &&
(serialDevice->blocked.fct ==
(void*) ciaaSerialDevices_write) )
{
/* invalidate task id */
serialDevice->blocked.taskID = 255; /* TODO add a macro */
/* reset function */
serialDevice->blocked.fct = NULL;
/* set task event */
#ifdef POSIXE
SetEvent(taskID, POSIXE);
#endif
}
}
}
extern size_t ciaaLibs_circBufGet(ciaaLibs_CircBufType * cbuf, void * data, size_t nbytes)
{
size_t rawCount;
/* the tail of the circular buffer my be changed, therefore it has to be
* read only once */
size_t tail = cbuf->tail;
/* if the users tries to read to much data, only available data will be
* provided */
if (nbytes > ciaaLibs_circBufCount(cbuf, tail))
{
nbytes = ciaaLibs_circBufCount(cbuf, tail);
}
/* check if data to be read */
if (nbytes > 0)
{
rawCount = ciaaLibs_circBufRawCount(cbuf, tail);
/* check if all data can be read without wrapping */
if (nbytes <= rawCount)
{
ciaaPOSIX_memcpy(data, ciaaLibs_circBufReadPos(cbuf), nbytes);
}
else
{
ciaaPOSIX_memcpy(data, ciaaLibs_circBufReadPos(cbuf), rawCount);
ciaaPOSIX_memcpy((void*)((intptr_t)data + rawCount), (void*)(&cbuf->buf[0]), nbytes-rawCount);
}
/* calculates new head position */
ciaaLibs_circBufUpdateHead(cbuf, nbytes);
}
return nbytes;
} /* end ciaaLibs_circBufGet */
