nordic_common.h

NRf24l01 代码

/* Copyright (c) 2006 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is confidential property of Nordic Semiconductor. The use,
 * copying, transfer or disclosure of such information is prohibited except by express written
 * agreement with Nordic Semiconductor.
 */

/** @file
 * Common defines and macros for firmware developed by Nordic Semiconductor.
 *
 * @author Ken A. Redergaard
 */

#ifndef NORDIC_COMMON_H__
#define NORDIC_COMMON_H__

/** Swaps the upper byte with the lower byte in a 16 bit variable */
//lint -emacro((572),SWAP) // Suppress warning 572 "Excessive shift value"
#define SWAP(x) ((((x)&0xFF)<<8)|(((x)>>8)&0xFF))

/** The upper 8 bits of a 16 bit value */
#define MSB(a) ((a & 0xFF00) >> 8)
/** The lower 8 bits (of a 16 bit value) */
#define LSB(a) ((a & 0xFF))

/** Leaves the minimum of the two arguments */
#define MIN(a, b) ((a) < (b) ? (a) : (b))
/** Leaves the maximum of the two arguments */
#define MAX(a, b) ((a) < (b) ? (b) : (a))

#define BIT_0 0x01 /**< The value of bit 0 */
#define BIT_1 0x02 /**< The value of bit 1 */
#define BIT_2 0x04 /**< The value of bit 2 */
#define BIT_3 0x08 /**< The value of bit 3 */
#define BIT_4 0x10 /**< The value of bit 4 */
#define BIT_5 0x20 /**< The value of bit 5 */
#define BIT_6 0x40 /**< The value of bit 6 */
#define BIT_7 0x80 /**< The value of bit 7 */

#endif // NORDIC_COMMON_H__