can-helpers.h File Reference

This header file is part of CAN/CAN FD bus common support. It implements functions and defines used to simplify controller's operations. More...

#include <rtems.h>
#include <stdatomic.h>

Go to the source code of this file.

Macros
#define	RTEMS_CAN_USER_MAGIC   0x05402033
	This define provides user magic value. It is used to check whether rtems_can_user structure was correctly initialized.
#define	BIT(nr)   (1UL << (nr))
#define	GENMASK(h, l)   (((~0UL) << (l)) & (~0UL >> (sizeof(long) * 8 - 1 - (h))))
#define	__bf_shf(x)   (__builtin_ffsll(x) - 1)
#define	FIELD_PREP(_mask, _val)
#define	FIELD_GET(_mask, _reg)

Detailed Description

This header file is part of CAN/CAN FD bus common support. It implements functions and defines used to simplify controller's operations.

Implementation is based on original LinCAN - Linux CAN bus driver Part of OrtCAN project https://ortcan.sourceforge.net/

Macro Definition Documentation

FIELD_GET

#define FIELD_GET	(		_mask,
			_reg
	)

Value:

    ({                              \
        (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \
    })

FIELD_PREP

#define FIELD_PREP	(		_mask,
			_val
	)

Value:

    ({                              \
        ((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask);   \
    })