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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > CTS / V2-1-0

Constituent: cts_lcp_sumt     Tag: mv2304

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CTX_lcp.c File Reference

CTX service callback (LAT/SIU 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_rt.h"
#include "CTDB/SUMT_rt.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_lcp.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)
	CTDB service layer callback.
unsigned int	CTX_sendTlm (void *prm, const ITC_QueueItem *qitem, void *pay, unsigned int len)
	CTDB service layer callback.

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Detailed Description

CTX service callback (LAT/SIU specific).

CVS $Id: CTX_lcp.c,v 1.4 2005/05/12 01:23:17 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 )

CTDB service layer callback. 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 LAT side applications want to send to the spacecraft. 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_sendCdm() 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: CTS_BADQUEU  CTX does not accept packets this queue CTS_CMDAPID  Telecommand APID not in valid range CTS_CMDBITC  Telecommand bit clear in telecommand packet CTS_CMDEVEN  Telecommand packet length not an even number of bytes CTS_CMDHEAD  Telecommand packet header verification failed CTS_CMDLEN  Telecommand packet length not in valid range CTS_CMDQUEU  Error queueing telecommmand packet to CTDB driver ITC_FORWARD  Service completed successfully, do not free packet

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

CTDB service layer callback. Parameters: prm  (in) User context parameter qitem  (in) Queue item pay  (in) Queue item payload pointer len  (in) Queue item payload length CTX_sendTlm() reads two ITC queues, ITC_QID_CTL_X and ITC_QID_CTL, looking for telemetry that LAT side applications want to send to the spacecraft. Telemtry is expected to be in the form of valid CCSDS packets contained in ITC protocol (though CTX_sendTlm() will check CCSDS integrity, see below). The two queues have dedicated purposes: ITC_QID_CTL_X Alert telemetry ITC_QID_CTL Diagnostic telemetry Warning: Byte ordering: CTX_sendTlm() 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_sendTlm() will perform any necessary byte-swapping on CCSDS headers only. (A service layer routine such CTX_sendTlm() 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 telemetry primary header and a telemetry secondary header. Packet length is greater than a maximum size defined by CTDB_CONFIG_PKT_SIZE_TELEM. The packet is not CCSDS version 1. Packet secondary header bit is clear. Packet command bit is set. For packets arriving on the ITC_QID_CTL_X queue, the APID is outside the valid range for alert telemetry. For packets arriving on the ITC_QID_CTL queue, the APID is outside the valid range for diagnostic telemetry. For packets passing these tests, CTX_sendTlm() will: Insert the CCSDS header sequence number (maintained per APID). Do any necessary byte-swapping on headers. ????? Return values: CTS_BADQUEU  CTX does not accept packets this queue CTS_TLMAPID  Telemetry APID not in valid range CTS_TLMBITS  Telecommand bit set in telemetry packet CTS_TLMEVEN  Telemetry packet length not an even number of bytes CTS_TLMHEAD  Telemetry packet header verification failed CTS_TLMLEN  Telemetry packet length not in valid range CTS_TLMQUEU  Error queueing telemetry to CTDB driver ITC_FORWARD  Service completed successfully, do not free packet

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