Register and protocol reference

SPI frames are 16 bits. Bit 15 is even parity. In a command, bit 14 selects a read and bits 13:0 carry the address. In a response, bit 14 is the error flag and bits 13:0 carry data. Read responses are delayed by one frame, so ordinary reads send a command followed by NOP.

Registers used by the driver

Address	Symbol	Purpose
0x0000	AS5048A_REG_NOP	Retrieves a pending response without requesting another register.
0x0001	AS5048A_REG_CLEAR_ERROR	Returns and clears communication error flags.
0x0016	AS5048A_REG_ZERO_POSITION_HIGH	Zero-position bits 13:6.
0x0017	AS5048A_REG_ZERO_POSITION_LOW	Zero-position bits 5:0.
0x3FFD	AS5048A_REG_DIAGNOSTICS_AGC	AGC and magnetic diagnostic flags.
0x3FFE	AS5048A_REG_MAGNITUDE	14-bit CORDIC magnitude.
0x3FFF	AS5048A_REG_ANGLE	14-bit compensated angle.

registers.h also defines masks, offsets, angle conversion constants, field helpers, response helpers, and zero-position split/combine macros. Programming control symbols are defined for completeness, but the public driver provides no OTP programming operation.