tc_acceptance.c
504 lines
| 14.5 KiB
| text/x-c
|
CLexer
/ src / tc_acceptance.c
| r390 | /*------------------------------------------------------------------------------ | |||
| -- Solar Orbiter's Low Frequency Receiver Flight Software (LFR FSW), | ||||
| -- This file is a part of the LFR FSW | ||||
| -- Copyright (C) 2012-2018, Plasma Physics Laboratory - CNRS | ||||
| -- | ||||
| -- This program is free software; you can redistribute it and/or modify | ||||
| -- it under the terms of the GNU General Public License as published by | ||||
| -- the Free Software Foundation; either version 2 of the License, or | ||||
| -- (at your option) any later version. | ||||
| -- | ||||
| -- This program is distributed in the hope that it will be useful, | ||||
| -- but WITHOUT ANY WARRANTY; without even the implied warranty of | ||||
| -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||||
| -- GNU General Public License for more details. | ||||
| -- | ||||
| -- You should have received a copy of the GNU General Public License | ||||
| -- along with this program; if not, write to the Free Software | ||||
| -- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||||
| -------------------------------------------------------------------------------*/ | ||||
| /*-- Author : Paul Leroy | ||||
| -- Contact : Alexis Jeandet | ||||
| -- Mail : alexis.jeandet@lpp.polytechnique.fr | ||||
| ----------------------------------------------------------------------------*/ | ||||
paul
|
r45 | /** Functions related to TeleCommand acceptance. | ||
| * | ||||
| * @file | ||||
| * @author P. LEROY | ||||
| * | ||||
| * A group of functions to handle TeleCommands parsing.\n | ||||
| * | ||||
| */ | ||||
| #include "tc_acceptance.h" | ||||
|
paul
|
r209 | #include <stdio.h> | ||
|
paul
|
r45 | |||
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paul
|
r321 | unsigned int lookUpTableForCRC[CONST_256] = {0}; | ||
|
paul
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r45 | |||
| //********************** | ||||
| // GENERAL USE FUNCTIONS | ||||
| unsigned int Crc_opt( unsigned char D, unsigned int Chk) | ||||
| { | ||||
| /** This function generate the CRC for one byte and returns the value of the new syndrome. | ||||
| * | ||||
| * @param D is the current byte of data. | ||||
| * @param Chk is the current syndrom value. | ||||
|
paul
|
r51 | * | ||
|
paul
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r45 | * @return the value of the new syndrome on two bytes. | ||
| * | ||||
| */ | ||||
|
paul
|
r318 | return(((Chk << SHIFT_1_BYTE) & BYTE0_MASK)^lookUpTableForCRC [(((Chk >> SHIFT_1_BYTE)^D) & BYTE1_MASK)]); | ||
|
paul
|
r45 | } | ||
| void initLookUpTableForCRC( void ) | ||||
| { | ||||
| /** This function is used to initiates the look-up table for fast CRC computation. | ||||
| * | ||||
| * The global table lookUpTableForCRC[256] is initiated. | ||||
| * | ||||
| */ | ||||
| unsigned int i; | ||||
| unsigned int tmp; | ||||
|
paul
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r318 | for (i=0; i<CONST_256; i++) | ||
|
paul
|
r45 | { | ||
| tmp = 0; | ||||
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paul
|
r318 | if((i & BIT_0) != 0) { | ||
| tmp = tmp ^ CONST_CRC_0; | ||||
|
paul
|
r45 | } | ||
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paul
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r318 | if((i & BIT_1) != 0) { | ||
| tmp = tmp ^ CONST_CRC_1; | ||||
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paul
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r45 | } | ||
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paul
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r318 | if((i & BIT_2) != 0) { | ||
| tmp = tmp ^ CONST_CRC_2; | ||||
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paul
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r45 | } | ||
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paul
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r318 | if((i & BIT_3) != 0) { | ||
| tmp = tmp ^ CONST_CRC_3; | ||||
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paul
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r45 | } | ||
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paul
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r318 | if((i & BIT_4) != 0) { | ||
| tmp = tmp ^ CONST_CRC_4; | ||||
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paul
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r45 | } | ||
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paul
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r318 | if((i & BIT_5) != 0) { | ||
| tmp = tmp ^ CONST_CRC_5; | ||||
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paul
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r45 | } | ||
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paul
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r318 | if((i & BIT_6) != 0) { | ||
| tmp = tmp ^ CONST_CRC_6; | ||||
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paul
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r45 | } | ||
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paul
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r318 | if((i & BIT_7) != 0) { | ||
| tmp = tmp ^ CONST_CRC_7; | ||||
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paul
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r45 | } | ||
| lookUpTableForCRC[i] = tmp; | ||||
| } | ||||
| } | ||||
| void GetCRCAsTwoBytes(unsigned char* data, unsigned char* crcAsTwoBytes, unsigned int sizeOfData) | ||||
| { | ||||
| /** This function calculates a two bytes Cyclic Redundancy Code. | ||||
| * | ||||
| * @param data points to a buffer containing the data on which to compute the CRC. | ||||
| * @param crcAsTwoBytes points points to a two bytes buffer in which the CRC is stored. | ||||
| * @param sizeOfData is the number of bytes of *data* used to compute the CRC. | ||||
| * | ||||
| * The specification of the Cyclic Redundancy Code is described in the following document: ECSS-E-70-41-A. | ||||
| * | ||||
| */ | ||||
| unsigned int Chk; | ||||
| int j; | ||||
|
paul
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r318 | Chk = CRC_RESET; // reset the syndrom to all ones | ||
|
paul
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r45 | for (j=0; j<sizeOfData; j++) { | ||
| Chk = Crc_opt(data[j], Chk); | ||||
| } | ||||
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paul
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r318 | crcAsTwoBytes[0] = (unsigned char) (Chk >> SHIFT_1_BYTE); | ||
| crcAsTwoBytes[1] = (unsigned char) (Chk & BYTE1_MASK); | ||||
|
paul
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r45 | } | ||
| //********************* | ||||
| // ACCEPTANCE FUNCTIONS | ||||
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paul
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r112 | int tc_parser(ccsdsTelecommandPacket_t * TCPacket, unsigned int estimatedPacketLength, unsigned char *computed_CRC) | ||
|
paul
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r45 | { | ||
| /** This function parses TeleCommands. | ||||
| * | ||||
| * @param TC points to the TeleCommand that will be parsed. | ||||
|
paul
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r112 | * @param estimatedPacketLength is the PACKET_LENGTH field calculated from the effective length of the received packet. | ||
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paul
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r46 | * | ||
|
paul
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r45 | * @return Status code of the parsing. | ||
| * | ||||
| * The parsing checks: | ||||
| * - process id | ||||
| * - category | ||||
| * - length: a global check is performed and a per subtype check also | ||||
| * - type | ||||
| * - subtype | ||||
| * - crc | ||||
| * | ||||
| */ | ||||
| int status; | ||||
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paul
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r68 | int status_crc; | ||
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paul
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r45 | unsigned char pid; | ||
| unsigned char category; | ||||
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paul
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r112 | unsigned int packetLength; | ||
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paul
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r45 | unsigned char packetType; | ||
| unsigned char packetSubtype; | ||||
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paul
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r46 | unsigned char sid; | ||
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paul
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r45 | |||
| status = CCSDS_TM_VALID; | ||||
| // APID check *** APID on 2 bytes | ||||
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paul
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r318 | pid = ((TCPacket->packetID[0] & BITS_PID_0) << SHIFT_4_BITS) | ||
| + ( (TCPacket->packetID[1] >> SHIFT_4_BITS) & BITS_PID_1 ); // PID = 11 *** 7 bits xxxxx210 7654xxxx | ||||
| category = (TCPacket->packetID[1] & BITS_CAT); // PACKET_CATEGORY = 12 *** 4 bits xxxxxxxx xxxx3210 | ||||
| packetLength = (TCPacket->packetLength[0] * CONST_256) + TCPacket->packetLength[1]; | ||||
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paul
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r112 | packetType = TCPacket->serviceType; | ||
| packetSubtype = TCPacket->serviceSubType; | ||||
| sid = TCPacket->sourceID; | ||||
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paul
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r45 | |||
| if ( pid != CCSDS_PROCESS_ID ) // CHECK THE PROCESS ID | ||||
| { | ||||
| status = ILLEGAL_APID; | ||||
| } | ||||
| if (status == CCSDS_TM_VALID) // CHECK THE CATEGORY | ||||
| { | ||||
| if ( category != CCSDS_PACKET_CATEGORY ) | ||||
| { | ||||
| status = ILLEGAL_APID; | ||||
| } | ||||
| } | ||||
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paul
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r112 | if (status == CCSDS_TM_VALID) // CHECK THE PACKET_LENGTH FIELD AND THE ESTIMATED PACKET_LENGTH COMPLIANCE | ||
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paul
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r45 | { | ||
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paul
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r112 | if (packetLength != estimatedPacketLength ) { | ||
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paul
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r51 | status = WRONG_LEN_PKT; | ||
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paul
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r45 | } | ||
| } | ||||
| if (status == CCSDS_TM_VALID) // CHECK THAT THE PACKET DOES NOT EXCEED THE MAX SIZE | ||||
| { | ||||
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paul
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r316 | if ( packetLength > CCSDS_TC_PKT_MAX_SIZE ) { | ||
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paul
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r51 | status = WRONG_LEN_PKT; | ||
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paul
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r45 | } | ||
| } | ||||
| if (status == CCSDS_TM_VALID) // CHECK THE TYPE | ||||
| { | ||||
| status = tc_check_type( packetType ); | ||||
| } | ||||
| if (status == CCSDS_TM_VALID) // CHECK THE SUBTYPE | ||||
| { | ||||
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paul
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r104 | status = tc_check_type_subtype( packetType, packetSubtype ); | ||
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paul
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r45 | } | ||
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paul
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r46 | if (status == CCSDS_TM_VALID) // CHECK THE SID | ||
| { | ||||
| status = tc_check_sid( sid ); | ||||
| } | ||||
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paul
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r45 | if (status == CCSDS_TM_VALID) // CHECK THE SUBTYPE AND LENGTH COMPLIANCE | ||
| { | ||||
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paul
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r112 | status = tc_check_length( packetSubtype, packetLength ); | ||
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paul
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r45 | } | ||
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paul
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r112 | status_crc = tc_check_crc( TCPacket, estimatedPacketLength, computed_CRC ); | ||
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paul
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r45 | if (status == CCSDS_TM_VALID ) // CHECK CRC | ||
| { | ||||
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paul
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r68 | status = status_crc; | ||
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paul
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r45 | } | ||
| return status; | ||||
| } | ||||
| int tc_check_type( unsigned char packetType ) | ||||
| { | ||||
| /** This function checks that the type of a TeleCommand is valid. | ||||
| * | ||||
| * @param packetType is the type to check. | ||||
|
paul
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r46 | * | ||
|
paul
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r45 | * @return Status code CCSDS_TM_VALID or ILL_TYPE. | ||
| * | ||||
| */ | ||||
| int status; | ||||
|
paul
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r320 | status = ILL_TYPE; | ||
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paul
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r45 | if ( (packetType == TC_TYPE_GEN) || (packetType == TC_TYPE_TIME)) | ||
| { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| else | ||||
| { | ||||
| status = ILL_TYPE; | ||||
| } | ||||
| return status; | ||||
| } | ||||
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paul
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r104 | int tc_check_type_subtype( unsigned char packetType, unsigned char packetSubType ) | ||
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paul
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r45 | { | ||
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paul
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r104 | /** This function checks that the subtype of a TeleCommand is valid and coherent with the type. | ||
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paul
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r45 | * | ||
|
paul
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r104 | * @param packetType is the type of the TC. | ||
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paul
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r45 | * @param packetSubType is the subtype to check. | ||
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paul
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r46 | * | ||
|
paul
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r45 | * @return Status code CCSDS_TM_VALID or ILL_SUBTYPE. | ||
| * | ||||
| */ | ||||
| int status; | ||||
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paul
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r104 | switch(packetType) | ||
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paul
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r45 | { | ||
|
paul
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r104 | case TC_TYPE_GEN: | ||
| if ( (packetSubType == TC_SUBTYPE_RESET) | ||||
| || (packetSubType == TC_SUBTYPE_LOAD_COMM) | ||||
| || (packetSubType == TC_SUBTYPE_LOAD_NORM) || (packetSubType == TC_SUBTYPE_LOAD_BURST) | ||||
| || (packetSubType == TC_SUBTYPE_LOAD_SBM1) || (packetSubType == TC_SUBTYPE_LOAD_SBM2) | ||||
| || (packetSubType == TC_SUBTYPE_DUMP) | ||||
| || (packetSubType == TC_SUBTYPE_ENTER) | ||||
| || (packetSubType == TC_SUBTYPE_UPDT_INFO) | ||||
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paul
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r194 | || (packetSubType == TC_SUBTYPE_EN_CAL) || (packetSubType == TC_SUBTYPE_DIS_CAL) | ||
| || (packetSubType == TC_SUBTYPE_LOAD_K) || (packetSubType == TC_SUBTYPE_DUMP_K) | ||||
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paul
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r282 | || (packetSubType == TC_SUBTYPE_LOAD_FBINS) | ||
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paul
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r283 | || (packetSubType == TC_SUBTYPE_LOAD_FILTER_PAR)) | ||
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paul
|
r104 | { | ||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| else | ||||
| { | ||||
| status = ILL_SUBTYPE; | ||||
| } | ||||
| break; | ||||
| case TC_TYPE_TIME: | ||||
| if (packetSubType == TC_SUBTYPE_UPDT_TIME) | ||||
| { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| else | ||||
| { | ||||
| status = ILL_SUBTYPE; | ||||
| } | ||||
| break; | ||||
| default: | ||||
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paul
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r51 | status = ILL_SUBTYPE; | ||
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paul
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r104 | break; | ||
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paul
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r45 | } | ||
| return status; | ||||
| } | ||||
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paul
|
r46 | int tc_check_sid( unsigned char sid ) | ||
| { | ||||
| /** This function checks that the sid of a TeleCommand is valid. | ||||
| * | ||||
| * @param sid is the sid to check. | ||||
| * | ||||
| * @return Status code CCSDS_TM_VALID or CORRUPTED. | ||||
| * | ||||
| */ | ||||
| int status; | ||||
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paul
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r320 | status = WRONG_SRC_ID; | ||
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paul
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r104 | if ( (sid == SID_TC_MISSION_TIMELINE) || (sid == SID_TC_TC_SEQUENCES) || (sid == SID_TC_RECOVERY_ACTION_CMD) | ||
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paul
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r46 | || (sid == SID_TC_BACKUP_MISSION_TIMELINE) | ||
| || (sid == SID_TC_DIRECT_CMD) || (sid == SID_TC_SPARE_GRD_SRC1) || (sid == SID_TC_SPARE_GRD_SRC2) | ||||
| || (sid == SID_TC_OBCP) || (sid == SID_TC_SYSTEM_CONTROL) || (sid == SID_TC_AOCS) | ||||
| || (sid == SID_TC_RPW_INTERNAL)) | ||||
| { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| else | ||||
| { | ||||
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paul
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r51 | status = WRONG_SRC_ID; | ||
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paul
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r46 | } | ||
| return status; | ||||
| } | ||||
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paul
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r45 | int tc_check_length( unsigned char packetSubType, unsigned int length ) | ||
| { | ||||
| /** This function checks that the subtype and the length are compliant. | ||||
| * | ||||
| * @param packetSubType is the subtype to check. | ||||
| * @param length is the length to check. | ||||
|
paul
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r46 | * | ||
|
paul
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r45 | * @return Status code CCSDS_TM_VALID or ILL_TYPE. | ||
| * | ||||
| */ | ||||
| int status; | ||||
| status = LFR_SUCCESSFUL; | ||||
| switch(packetSubType) | ||||
| { | ||||
| case TC_SUBTYPE_RESET: | ||||
| if (length!=(TC_LEN_RESET-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
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r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_LOAD_COMM: | ||||
| if (length!=(TC_LEN_LOAD_COMM-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
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paul
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r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_LOAD_NORM: | ||||
| if (length!=(TC_LEN_LOAD_NORM-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
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r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_LOAD_BURST: | ||||
| if (length!=(TC_LEN_LOAD_BURST-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
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paul
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r51 | status = WRONG_LEN_PKT; | ||
|
paul
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r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_LOAD_SBM1: | ||||
| if (length!=(TC_LEN_LOAD_SBM1-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
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paul
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r51 | status = WRONG_LEN_PKT; | ||
|
paul
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r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_LOAD_SBM2: | ||||
| if (length!=(TC_LEN_LOAD_SBM2-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
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r51 | status = WRONG_LEN_PKT; | ||
|
paul
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r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_DUMP: | ||||
| if (length!=(TC_LEN_DUMP-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
|
r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_ENTER: | ||||
| if (length!=(TC_LEN_ENTER-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
|
r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_UPDT_INFO: | ||||
| if (length!=(TC_LEN_UPDT_INFO-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
|
r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_EN_CAL: | ||||
| if (length!=(TC_LEN_EN_CAL-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
|
r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_DIS_CAL: | ||||
| if (length!=(TC_LEN_DIS_CAL-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
|
r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
|
paul
|
r194 | case TC_SUBTYPE_LOAD_K: | ||
| if (length!=(TC_LEN_LOAD_K-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
| status = WRONG_LEN_PKT; | ||||
| } | ||||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_DUMP_K: | ||||
| if (length!=(TC_LEN_DUMP_K-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
| status = WRONG_LEN_PKT; | ||||
| } | ||||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| case TC_SUBTYPE_LOAD_FBINS: | ||||
| if (length!=(TC_LEN_LOAD_FBINS-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
| status = WRONG_LEN_PKT; | ||||
| } | ||||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
|
paul
|
r283 | case TC_SUBTYPE_LOAD_FILTER_PAR: | ||
| if (length!=(TC_LEN_LOAD_FILTER_PAR-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
|
paul
|
r282 | status = WRONG_LEN_PKT; | ||
| } | ||||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
|
paul
|
r45 | case TC_SUBTYPE_UPDT_TIME: | ||
| if (length!=(TC_LEN_UPDT_TIME-CCSDS_TC_TM_PACKET_OFFSET)) { | ||||
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paul
|
r51 | status = WRONG_LEN_PKT; | ||
|
paul
|
r45 | } | ||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| break; | ||||
| default: // if the subtype is not a legal value, return ILL_SUBTYPE | ||||
| status = ILL_SUBTYPE; | ||||
| break ; | ||||
| } | ||||
| return status; | ||||
| } | ||||
| int tc_check_crc( ccsdsTelecommandPacket_t * TCPacket, unsigned int length, unsigned char *computed_CRC ) | ||||
| { | ||||
| /** This function checks the CRC validity of the corresponding TeleCommand packet. | ||||
| * | ||||
| * @param TCPacket points to the TeleCommand packet to check. | ||||
| * @param length is the length of the TC packet. | ||||
|
paul
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r46 | * | ||
|
paul
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r45 | * @return Status code CCSDS_TM_VALID or INCOR_CHECKSUM. | ||
| * | ||||
| */ | ||||
| int status; | ||||
| unsigned char * CCSDSContent; | ||||
|
paul
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r320 | status = INCOR_CHECKSUM; | ||
|
paul
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r45 | CCSDSContent = (unsigned char*) TCPacket->packetID; | ||
|
paul
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r318 | GetCRCAsTwoBytes(CCSDSContent, computed_CRC, length + CCSDS_TC_TM_PACKET_OFFSET - BYTES_PER_CRC); // 2 CRC bytes removed from the calculation of the CRC | ||
|
paul
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r209 | |||
|
paul
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r318 | if (computed_CRC[0] != CCSDSContent[length + CCSDS_TC_TM_PACKET_OFFSET - BYTES_PER_CRC]) { | ||
|
paul
|
r45 | status = INCOR_CHECKSUM; | ||
| } | ||||
| else if (computed_CRC[1] != CCSDSContent[length + CCSDS_TC_TM_PACKET_OFFSET -1]) { | ||||
| status = INCOR_CHECKSUM; | ||||
| } | ||||
| else { | ||||
| status = CCSDS_TM_VALID; | ||||
| } | ||||
| return status; | ||||
| } | ||||
