static inline u8 siox_status_clean()

in siox-core.c [51:66]

• 4 lines of code
• 1 McCabe index (conditional complexity)

static inline u8 siox_status_clean(u8 status_read, u8 status_written)
{
	/*
	 * bits 3:1 of status sample the respective bit in the status
	 * byte written in the previous cycle but inverted. So if you wrote the
	 * status word as 0xa before (counter = 0b101), it is expected to get
	 * back the counter bits as 0b010.
	 *
	 * So given the last status written this function toggles the there
	 * unset counter bits in the read value such that the counter bits in
	 * the return value are all zero iff the bits were read as expected to
	 * simplify error detection.
	 */

	return status_read ^ (~status_written & 0xe);
}