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Updated CCSDS CuC Functions

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This commit is contained in:
Steffen Gaisser 2022-03-28 21:24:33 +02:00
parent b4effe7a46
commit 4f9797af3b
3 changed files with 50 additions and 10 deletions
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12
src/fsfw/timemanager/CCSDSTime.cpp
View File

@ -428,7 +428,7 @@ ReturnValue_t CCSDSTime::convertFromCUC(timeval* to, const uint8_t* from, size_t
from++;
ReturnValue_t result = convertFromCUC(to, pField, from, foundLength, maxLength - 1);
if (result == HasReturnvaluesIF::RETURN_OK) {
if (foundLength != NULL) {
if (foundLength != nullptr) {
*foundLength += 1;
}
}
@ -588,18 +588,18 @@ ReturnValue_t CCSDSTime::convertFromCUC(timeval* to, uint8_t pField, const uint8
uint8_t nCoarse = ((pField & 0b1100) >> 2) + 1;
uint8_t nFine = (pField & 0b11);
size_t totalLength = nCoarse + nFine;
if (foundLength != NULL) {
if (foundLength != nullptr) {
*foundLength = totalLength;
}
if (totalLength > maxLength) {
return LENGTH_MISMATCH;
}
for (int count = 0; count < nCoarse; count++) {
secs += *from << ((nCoarse * 8 - 8) * (1 + count));
for (int count = nCoarse; count > 0; count--) {
secs += *from << (count * 8 - 8);
from++;
}
for (int count = 0; count < nFine; count++) {
subSeconds += *from << ((nFine * 8 - 8) * (1 + count));
for (int count = nFine; count > 0; count--) {
subSeconds += *from << (count * 8 - 8);
from++;
}
// Move to POSIX epoch.

27
src/fsfw/timemanager/CCSDSTime.h
View File

@ -161,18 +161,37 @@ class CCSDSTime : public HasReturnvaluesIF {
*/
static ReturnValue_t convertFromCcsds(timeval *to, uint8_t const *from, size_t *foundLength,
size_t maxLength);
/**
* @brief Currently unsupported conversion due to leapseconds
*
* @param to Time Of Day (UTC)
* @param from Buffer to take the CUC from
* @param length Length of buffer
* @return ReturnValue_t UNSUPPORTED_TIME_FORMAT in any case ATM
*/
static ReturnValue_t convertFromCUC(Clock::TimeOfDay_t *to, uint8_t const *from, uint8_t length);
/**
* @brief Converts from CCSDS CUC to timeval
*
* If input is CCSDS Epoch this is TAI! -> No leapsecond support.
*
* Currently, it only supports seconds + 2 Byte Subseconds (1/65536 seconds)
*
*
* @param to Timeval to write the result to
* @param from Buffer to read from
* @param foundLength Length found by this function (can be nullptr if unused)
* @param maxLength Max length of the buffer to be read
* @return ReturnValue_t - RETURN_OK if successful
* - LENGTH_MISMATCH if expected length is larger than maxLength
*/
static ReturnValue_t convertFromCUC(timeval *to, uint8_t const *from, size_t *foundLength,
size_t maxLength);
static ReturnValue_t convertFromCUC(timeval *to, uint8_t pField, uint8_t const *from,
size_t *foundLength, size_t maxLength);
static ReturnValue_t convertFromCCS(timeval *to, uint8_t const *from, size_t *foundLength,
size_t maxLength);
static ReturnValue_t convertFromCCS(timeval *to, uint8_t pField, uint8_t const *from,
size_t *foundLength, size_t maxLength);

21
tests/src/fsfw_tests/unit/timemanager/TestCCSDSTime.cpp
View File

@ -179,6 +179,27 @@ TEST_CASE("CCSDSTime Tests", "[TestCCSDSTime]") {
CHECK(todFromCCSDS.second == time.second);
CHECK(todFromCCSDS.usecond == 123000);
}
SECTION("CUC") {
timeval to;
// seconds = 0x771E960F, microseconds = 0x237
// microseconds = 567000
// This gives 37158.912 1/65536 seconds -> rounded to 37159 -> 0x9127
// This results in -> 567001 us
std::array<uint8_t, 7> cucBuffer = {
CCSDSTime::P_FIELD_CUC_6B_CCSDS, 0x77, 0x1E, 0x96, 0x0F, 0x91, 0x27};
size_t foundLength = 0;
auto result = CCSDSTime::convertFromCUC(&to, cucBuffer.data(), &foundLength, cucBuffer.size());
REQUIRE(result == HasReturnvaluesIF::RETURN_OK);
REQUIRE(foundLength == 7);
REQUIRE(to.tv_sec == 1619801999); // TAI (no leap seconds)
REQUIRE(to.tv_usec == 567001);
Clock::TimeOfDay_t tod;
result = CCSDSTime::convertFromCUC(&tod, cucBuffer.data(), cucBuffer.size());
// This test must be changed if this is ever going to be implemented
REQUIRE(result == CCSDSTime::UNSUPPORTED_TIME_FORMAT);
}
SECTION("CCSDS Failures") {
Clock::TimeOfDay_t time;
time.year = 2020;