Struct OpenSkyhawk::CalBlob

ClassList > OpenSkyhawk > CalBlob

The whole persisted calibration set, written and erased as one unit. More...

• #include <AxisCal.h>

Public Attributes

Type	Name
AxisCal	axes offset 6 — 64 bytes
uint16_t	crc offset 70 — CRC-16/CCITT-FALSE over bytes [0, 70)
uint32_t	magic offset 0 — CAL_MAGIC
uint16_t	version offset 4 — CAL_VERSION

Detailed Description

Offsets are natural-alignment under ARM EABI and happen to pack tight with no padding. That is luck rather than design, which is why the static_asserts below are load-bearing — crc is computed over offsetof(CalBlob, crc) bytes, so a layout change silently invalidates every stored blob unless CAL_VERSION moves with it.

Note:

Not __attribute__((packed)). There is no padding to remove, and packing would make every field access unaligned on a Cortex-M0+, which has no unaligned load/store.

Public Attributes Documentation

variable axes

offset 6 — 64 bytes

AxisCal OpenSkyhawk::CalBlob::axes[AXIS_CAL_SLOTS];

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variable crc

offset 70 — CRC-16/CCITT-FALSE over bytes [0, 70)

uint16_t OpenSkyhawk::CalBlob::crc;

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variable magic

offset 0 — CAL_MAGIC

uint32_t OpenSkyhawk::CalBlob::magic;

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variable version

offset 4 — CAL_VERSION

uint16_t OpenSkyhawk::CalBlob::version;

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The documentation for this class was generated from the following file Firmware/Libraries/SimGateway/AxisCal.h