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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > CTS / V2-0-0

Constituent: cts_scp_enet     Tag: mv2304

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CTX_scp.c File Reference

CTX service callback ("spacecraft" specific). More...

#include <string.h>
#include "PBS/MBA.h"
#include "MSG/MSG_pubdefs.h"
#include "CCSDS/CCSDS_pkt.h"
#include "CTDB/CTDB_config.h"
#include "CTDB/CTDB_bc.h"
#include "ITC/ITC_apidefs.h"
#include "ITC/ITC_drvdefs.h"
#include "ITC/ITC_pubdefs.h"
#include "ITC/ITC_msgs.h"
#include "CTS/CTS_pubdefs.h"
#include "CTS/CTS_msgs.h"
#include "CTS_prvdefs.h"

Include dependency graph for CTX_scp.c:

Functions
void	CTX_freePacket (void *pkt, void *prm)
	Free a queue item.
unsigned int	CTX_createService (ITC_TaskID tid, unsigned int nim, ITC_cb_Memory *rtn, void *prm)
	Initialize an CTX service control block.
unsigned int	CTX_sendCmd (void *prm, const ITC_QueueItem *qitem, void *pay, unsigned int len)
	Callback for service task sending telecommands to LAT.

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Detailed Description

CTX service callback ("spacecraft" specific).

CVS $Id: CTX_scp.c,v 1.3 2005/04/12 00:15:24 apw Exp $

Author:

A.P.Waite

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Function Documentation

unsigned int CTX_createService (  ITC_TaskID  tid, unsigned int  nim, ITC_cb_Memory *  rtn, void *  prm )

Initialize an CTX service control block. Parameters: tid  (in) ITC task ID for this service nim  (in) Mask of ITC nodes served by this service (not implemented) rtn  (in) Memory allocator for diagnostic stream prm  (in) Memory allocator for diagnostic stream - parameter Return values: CTS_SUCCESS  Success CTS_GENERROR  Generic error CTX_createService() creates and intializes an CTX service control block

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void CTX_freePacket (  void *  pkt, void *  prm )  [static]

Free a queue item. Parameters: pkt  Packet to free (unused) prm  User context parameter (queue item)

unsigned int CTX_sendCmd (  void *  prm, const ITC_QueueItem *  qitem, void *  pay, unsigned int  len )

Callback for service task sending telecommands to LAT. Parameters: prm  (in) User context parameter qitem  (in) Queue item pay  (in) Queue item payload pointer len  (in) Queue item payload length CTX_sendCmd() reads one ITC queue, ITC_QID_CMD, looking for commands that spacecraft side applications want to send to the LAT. Commands are expected to be valid CCSDS packets contained in ITC protocol (though CTX_sendCmd() will check CCSDS integrity, see below). Warning: Byte ordering: CTX_sendCmd() requires that incoming packets have their CCSDS header in machine-local byte order. Because the CTDB driver expects the packet in network (big-endian) order, CTX_sendCmd() will perform any necessary byte-swapping on CCSDS headers and checksum fields only. (A service layer routine such as CTX_sendCmd() has no basis to perform CCSDS packet payload byte-swapping). If any of the following conditions is true, the packet is dropped: Packet size is less than the sum of: a telecommand primary header, a telecommand secondary header, a telecommand checksum. Packet length is greater than a maximum size defined by CTDB_CONFIG_PKT_SIZE_CMD_RX. The packet is an odd number of bytes. The packet is not CCSDS version 1. Packet secondary header bit is clear. Packet command bit is clear. APID is outside the allowed range for telecommands from spacecraft to LAT. For packets passing these tests, CTX_sendCmd() will: Insert the CCSDS header sequence number (maintained per APID). Calculate and insert the checksum. Do any necessary byte-swapping on headers and checksums. ????? Return values: CTX_BADQUEU  CTX does not accept packets this queue CTX_CMDAPID  Telecommand APID not in valid range CTX_CMDBITC  Telecommand bit clear in telecommand packet CTX_CMDEVEN  Telecommand packet length not an even number of bytes CTX_CMDHEAD  Telecommand packet header verification failed CTX_CMDLEN  Telecommand packet length not in valid range CTX_CMDQUEU  Error queueing telecommmand packet to CTDB driver ITC_FORWARD  Service completed successfully, do not free packet

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