Cronologic Ndigo Crate Guía de usuario descargar pdf (Pagina 43)

3.5 Readout

int ndigo250m read(ndigo device *device, ndigo250m read in *in, ndigo250m read out *out)

For each DMA channel returns a pointer to an array of captured data in read out. The result

can contain any number of packets of type ndigo packet. read in provides parameters to the

driver. A call to this method automatically allows the driver to reuse the memory returned in

the previous call.

Returns an error code as deﬁned in the structure ndigo read out.

int ndigo250m acknowledge(ndigo device *device, ndigo packet *packet)

Acknowledge all data up to the packet provided as parameter. This is mandatory if acknowl-

edge last read in the ndigo read in structure is set to false for calls to ndigo read.

This feature allows to either free up partial DMA space early if there will be no call to

ndigo read anytime soon. It also allows to keep data over multiple calls to ndigo read to avoid

unnecessary copying of data.

int ndigo process tdc packet(ndigo device *device, ndigo packet *packet)

Call on a TDC packet to update the timestamp of the packet with a more accurate value. If

called more than once on a packet the timestamp will be invalid.

3.5.1 Input Structure ndigo250m read in

ndigo bool t acknowledge last read

If set ndigo read automatically acknowledges packets from the last read.

mask

This is a bitmask that deﬁnes which channels are to be read. All other channels will be left

untouched. A value of 0 reads all channels.

3.5.2 Input Structure ndigo250m read out

ndigo packet *ﬁrst packet[NDIGO25M DMA COUNT]

For each DMA channel a pointer to the ﬁrst packet that was captured by the call of ndigo read.

ndigo packet *last packet[NDIGO25M DMA COUNT]

For each DMA channels the address of the header of the last packet in the buﬀer.

int error code[NDIGO25M DMA COUNT]

#deﬁne NDIGO READ OK 0

#deﬁne NDIGO READ NO DATA 1

#deﬁne NDIGO READ INTERNAL ERROR 2

const char *error message[NDIGO25M DMA COUNT] Error messages created by readout

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