231 lines
5.2 KiB
C++
231 lines
5.2 KiB
C++
/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include <satnogs/tc_tm.h>
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namespace gr
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{
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namespace satnogs
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{
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uint8_t
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checkSum (const uint8_t *data, uint16_t size)
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{
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uint8_t CRC = 0;
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for (int i = 0; i <= size; i++) {
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CRC = CRC ^ data[i];
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}
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return CRC;
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}
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/*Must check for endianess*/
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OBC_ret_state_t
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unpack_pkt (const uint8_t *buf, tc_tm_pkt *pkt, const uint16_t size)
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{
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union _cnv cnv;
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uint8_t tmp_crc[2];
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uint8_t ver, dfield_hdr, ccsds_sec_hdr, tc_pus;
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tmp_crc[0] = buf[size - 1];
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tmp_crc[1] = checkSum (buf, size - 2);
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ver = buf[0] >> 5;
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pkt->type = (buf[0] >> 4) & 0x01;
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dfield_hdr = (buf[0] >> 3) & 0x01;
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cnv.cnv8[0] = buf[1];
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cnv.cnv8[1] = 0x07 & buf[0];
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pkt->app_id = cnv.cnv16[0];
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pkt->seq_flags = buf[2] >> 6;
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cnv.cnv8[0] = buf[3];
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cnv.cnv8[1] = buf[2] & 0x3F;
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pkt->seq_count = cnv.cnv16[0];
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cnv.cnv8[0] = buf[4];
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cnv.cnv8[1] = buf[5];
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pkt->len = cnv.cnv16[0];
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ccsds_sec_hdr = buf[6] >> 7;
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tc_pus = buf[6] >> 4;
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pkt->ack = 0x04 & buf[6];
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pkt->ser_type = buf[7];
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pkt->ser_subtype = buf[8];
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pkt->dest_id = buf[9];
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if (app_id_verification[pkt->app_id] != 1) {
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return R_OBC_PKT_ILLEGAL_APPID;
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}
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if (pkt->len != size - 7) {
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return R_OBC_PKT_INV_LEN;
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}
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if (tmp_crc[0] != tmp_crc[1]) {
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return R_OBC_PKT_INC_CRC;
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}
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if (services_verification_TC_TM[pkt->ser_type][pkt->ser_subtype][pkt->type]
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!= 1) {
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return R_OBC_PKT_ILLEGAL_PKT_TP;
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}
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if (ver != 0) {
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return R_OBC_ERROR;
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}
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if (tc_pus != 1) {
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return R_OBC_ERROR;
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}
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if (ccsds_sec_hdr != 0) {
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return R_OBC_ERROR;
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}
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if (pkt->type != TC && pkt->type != TM) {
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return R_OBC_ERROR;
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}
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if (dfield_hdr != 1) {
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return R_OBC_ERROR;
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}
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if (pkt->ack != TC_ACK_NO || pkt->ack != TC_ACK_ACC
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|| pkt->ack != TC_ACK_EXE_COMP) {
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return R_OBC_ERROR;
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}
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for (int i = 0; i < pkt->len - 4; i++) {
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pkt->data[i] = buf[10 + i];
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}
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return R_OBC_OK;
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}
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/**
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* Packs a TC packet into a byte buffer
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* @param buf buffer to store the data to be sent
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* @param pkt the data to be stored in the buffer
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* @param size size of the array
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* @return appropriate error code or R_OBC_OK if all operation succeed
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*/
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OBC_ret_state_t
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pack_pkt (uint8_t *buf, tc_tm_pkt *pkt, uint16_t *size)
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{
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union _cnv cnv;
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uint8_t buf_pointer;
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cnv.cnv16[0] = pkt->app_id;
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buf[0] = ( ECSS_VER_NUMBER << 5 | pkt->type << 4
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| ECSS_DATA_FIELD_HDR_FLG << 3 | cnv.cnv8[1]);
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buf[1] = cnv.cnv8[0];
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cnv.cnv16[0] = pkt->seq_count;
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buf[2] = (pkt->seq_flags << 6 | cnv.cnv8[1]);
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buf[3] = cnv.cnv8[0];
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/* TYPE = 0 TM, TYPE = 1 TC*/
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if (pkt->type == TM) {
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buf[6] = ECSS_PUS_VER << 4;
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}
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else if (pkt->type == TC) {
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buf[6] = ( ECSS_SEC_HDR_FIELD_FLG << 7 | ECSS_PUS_VER << 4 | pkt->ack);
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}
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else {
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return R_OBC_ERROR;
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}
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buf[7] = pkt->ser_type;
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buf[8] = pkt->ser_subtype;
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buf[9] = pkt->dest_id; /*source or destination*/
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buf_pointer = 10;
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if (pkt->ser_type == TC_VERIFICATION_SERVICE) {
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//cnv.cnv16[0] = tc_pkt_id;
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//cnv.cnv16[1] = tc_pkt_seq_ctrl;
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/*verification_pack_pkt_api (buf, pkt, &buf_pointer);*/
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}
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else if (pkt->ser_type == TC_HOUSEKEEPING_SERVICE) {
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/*hk_pack_pkt_api (buf, pkt, &buf_pointer);*/
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}
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else if (pkt->ser_type == TC_FUNCTION_MANAGEMENT_SERVICE
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&& pkt->ser_subtype == 1) {
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buf[10] = pkt->data[0];
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buf[11] = pkt->data[1];
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buf[12] = pkt->data[2];
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buf[13] = pkt->data[3];
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buf[14] = pkt->data[4];
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buf_pointer += 5;
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}
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else {
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return R_OBC_ERROR;
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}
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/*check if this is correct*/
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cnv.cnv16[0] = buf_pointer - 6;
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buf[4] = cnv.cnv8[0];
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buf[5] = cnv.cnv8[1];
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buf[buf_pointer] = checkSum (buf, buf_pointer - 1);
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*size = buf_pointer;
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return R_OBC_OK;
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}
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OBC_ret_state_t
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crt_pkt (tc_tm_pkt *pkt, uint16_t app_id, uint8_t type, uint8_t ack,
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uint8_t ser_type, uint8_t ser_subtype, uint16_t dest_id)
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{
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pkt->type = type;
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pkt->app_id = app_id;
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pkt->dest_id = dest_id;
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pkt->ser_type = ser_type;
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pkt->ser_subtype = ser_subtype;
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return R_OBC_OK;
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}
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} /* namespace satnogs */
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} /* namespace gr */
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