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Clean up AIS lat/lon types and formatting.

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This commit is contained in:
Jared Boone 2016-01-15 15:25:32 -08:00
parent 1e92d416c7
commit f3989050e8
4 changed files with 82 additions and 13 deletions
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50
firmware/common/ais_packet.hpp
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@ -40,8 +40,54 @@ struct DateTime {
uint8_t second;
};
using Latitude = int32_t;
using Longitude = int32_t;
template<size_t FieldSize, int32_t DegMax, uint32_t NAValue>
struct LatLonBase {
constexpr LatLonBase(
) : LatLonBase { raw_not_available }
{
}
constexpr LatLonBase(
const int32_t raw
) : raw_ { raw }
{
}
constexpr LatLonBase(
const LatLonBase& other
) : raw_ { other.raw_ }
{
}
int32_t normalized() const {
return static_cast<int32_t>(raw() << sign_extend_shift) / (1 << sign_extend_shift);
}
int32_t raw() const {
return raw_;
}
bool is_not_available() const {
return raw() == raw_not_available;
}
bool is_valid() const {
return (normalized() >= raw_valid_min) && (normalized() <= raw_valid_max);
}
private:
int32_t raw_;
static constexpr size_t sign_extend_shift = 32 - FieldSize;
static constexpr int32_t raw_not_available = NAValue;
static constexpr int32_t raw_valid_min = -DegMax * 60 * 10000;
static constexpr int32_t raw_valid_max = DegMax * 60 * 10000;
};
using Latitude = LatLonBase<27, 90, 0x3412140>;
using Longitude = LatLonBase<28, 180, 0x6791AC0>;
using RateOfTurn = int8_t;
using SpeedOverGround = uint16_t;
using CourseOverGround = uint16_t;