fsfw/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.cpp

#include "TcPacketPus.h"

#include <cstring>

#include "fsfw/globalfunctions/CRC.h"

TcPacketPus::TcPacketPus(const uint8_t *setData) : TcPacketPusBase(setData) {
  tcData = reinterpret_cast<TcPacketPointer *>(const_cast<uint8_t *>(setData));
}

void TcPacketPus::initializeTcPacket(uint16_t apid, uint16_t sequenceCount, uint8_t ack,
                                     uint8_t service, uint8_t subservice,
                                     pus::PusVersion pusVersion, uint16_t sourceId) {
  initSpacePacketHeader(true, true, apid, sequenceCount);
  std::memset(&tcData->dataField, 0, sizeof(tcData->dataField));
  setPacketDataLength(sizeof(PUSTcDataFieldHeader) + CRC_SIZE - 1);
  // Data Field Header. For PUS A, the first bit (CCSDS Secondary Header Flag) is zero
  tcData->dataField.versionTypeAck = pusVersion << 4 | (ack & 0x0F);
  tcData->dataField.serviceType = service;
  tcData->dataField.serviceSubtype = subservice;
#if FSFW_USE_PUS_C_TELECOMMANDS == 1
  tcData->dataField.sourceIdH = (sourceId >> 8) | 0xff;
  tcData->dataField.sourceIdL = sourceId & 0xff;
#else
  tcData->dataField.sourceId = sourceId;
#endif
}

uint8_t TcPacketPus::getService() const { return tcData->dataField.serviceType; }

uint8_t TcPacketPus::getSubService() const { return tcData->dataField.serviceSubtype; }

uint8_t TcPacketPus::getAcknowledgeFlags() const {
  return tcData->dataField.versionTypeAck & 0b00001111;
}

const uint8_t *TcPacketPus::getApplicationData() const { return &tcData->appData; }

uint16_t TcPacketPus::getApplicationDataSize() const {
  return SpacePacketBase::getPacketDataLen() - sizeof(tcData->dataField) - CRC_SIZE + 1;
}

uint16_t TcPacketPus::getErrorControl() const {
  uint16_t size = getApplicationDataSize() + CRC_SIZE;
  uint8_t *p_to_buffer = &tcData->appData;
  return (p_to_buffer[size - 2] << 8) + p_to_buffer[size - 1];
}

void TcPacketPus::setErrorControl() {
  uint32_t full_size = getFullSize();
  uint16_t crc = CRC::crc16ccitt(getWholeData(), full_size - CRC_SIZE);
  uint32_t size = getApplicationDataSize();
  (&tcData->appData)[size] = (crc & 0XFF00) >> 8;  // CRCH
  (&tcData->appData)[size + 1] = (crc)&0X00FF;     // CRCL
}

uint8_t TcPacketPus::getSecondaryHeaderFlag() const {
#if FSFW_USE_PUS_C_TELECOMMANDS == 1
  // Does not exist for PUS C
  return 0;
#else
  return (tcData->dataField.versionTypeAck & 0b10000000) >> 7;
#endif
}

uint8_t TcPacketPus::getPusVersionNumber() const {
#if FSFW_USE_PUS_C_TELECOMMANDS == 1
  return (tcData->dataField.versionTypeAck & 0b11110000) >> 4;
#else
  return (tcData->dataField.versionTypeAck & 0b01110000) >> 4;
#endif
}

uint16_t TcPacketPus::getSourceId() const {
#if FSFW_USE_PUS_C_TELECOMMANDS == 1
  return (tcData->dataField.sourceIdH << 8) | tcData->dataField.sourceIdL;
#else
  return tcData->dataField.sourceId;
#endif
}

size_t TcPacketPus::calculateFullPacketLength(size_t appDataLen) const {
  return sizeof(CCSDSPrimaryHeader) + sizeof(PUSTcDataFieldHeader) + appDataLen +
         TcPacketPusBase::CRC_SIZE;
}

ReturnValue_t TcPacketPus::setData(uint8_t *dataPtr, size_t maxSize, void *args) {
  ReturnValue_t result = SpacePacketBase::setData(dataPtr, maxSize, args);
  if (result != HasReturnvaluesIF::RETURN_OK) {
    return result;
  }
  if (maxSize < sizeof(TcPacketPointer)) {
    return HasReturnvaluesIF::RETURN_FAILED;
  }
  // This function is const-correct, but it was decided to keep the pointer non-const
  // for convenience. Therefore, cast away constness here and then cast to packet type.
  tcData = reinterpret_cast<TcPacketPointer *>(const_cast<uint8_t *>(dataPtr));
  return HasReturnvaluesIF::RETURN_OK;
}