279 lines
9.6 KiB
C
279 lines
9.6 KiB
C
/**************************************************************************/
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/*!
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@file common.h
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@author hathach (tinyusb.org)
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@section LICENSE
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Software License Agreement (BSD License)
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Copyright (c) 2013, hathach (tinyusb.org)
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holders nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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This file is part of the tinyusb stack.
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*/
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/**************************************************************************/
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/** \ingroup Group_Common
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* \defgroup Group_CommonH common.h
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* @{ */
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#ifndef _TUSB_COMMON_H_
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#define _TUSB_COMMON_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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//--------------------------------------------------------------------+
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// INCLUDES
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//--------------------------------------------------------------------+
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//------------- Standard Header -------------//
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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//------------- TUSB Option Header -------------//
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#include "tusb_option.h"
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//------------- General Header -------------//
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#include "compiler/compiler.h"
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#include "assertion.h"
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#include "verify.h"
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#include "binary.h"
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#include "tusb_errors.h"
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#include "fifo.h"
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//------------- TUSB Header -------------//
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#include "tusb_types.h"
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#include "std_descriptors.h"
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#include "std_request.h"
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//--------------------------------------------------------------------+
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// MACROS
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//--------------------------------------------------------------------+
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#define MAX_OF(a, b) ( (a) > (b) ? (a) : (b) )
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#define MIN_OF(a, b) ( (a) < (b) ? (a) : (b) )
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#define U16_HIGH_U8(u16) ((uint8_t) (((u16) >> 8) & 0x00ff))
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#define U16_LOW_U8(u16) ((uint8_t) ((u16) & 0x00ff))
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#define U16_TO_U8S_BE(u16) U16_HIGH_U8(u16), U16_LOW_U8(u16)
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#define U16_TO_U8S_LE(u16) U16_LOW_U8(u16), U16_HIGH_U8(u16)
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#define U32_B1_U8(u32) ((uint8_t) (((u32) >> 24) & 0x000000ff)) // MSB
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#define U32_B2_U8(u32) ((uint8_t) (((u32) >> 16) & 0x000000ff))
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#define U32_B3_U8(u32) ((uint8_t) (((u32) >> 8) & 0x000000ff))
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#define U32_B4_U8(u32) ((uint8_t) ((u32) & 0x000000ff)) // LSB
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#define U32_TO_U8S_BE(u32) U32_B1_U8(u32), U32_B2_U8(u32), U32_B3_U8(u32), U32_B4_U8(u32)
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#define U32_TO_U8S_LE(u32) U32_B4_U8(u32), U32_B3_U8(u32), U32_B2_U8(u32), U32_B1_U8(u32)
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//------------- Endian Conversion -------------//
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#define ENDIAN_BE(u32) \
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(uint32_t) ( (((u32) & 0xFF) << 24) | (((u32) & 0xFF00) << 8) | (((u32) >> 8) & 0xFF00) | (((u32) >> 24) & 0xFF) )
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#define ENDIAN_BE16(le16) ((uint16_t) ((U16_LOW_U8(le16) << 8) | U16_HIGH_U8(le16)) )
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#ifndef __n2be_16
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#define __n2be_16(u16) ((uint16_t) ((U16_LOW_U8(u16) << 8) | U16_HIGH_U8(u16)) )
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#define __be2n_16(u16) __n2be_16(u16)
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#endif
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//--------------------------------------------------------------------+
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// INLINE FUNCTION
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//--------------------------------------------------------------------+
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#define memclr_(buffer, size) memset((buffer), 0, (size))
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#define memclr(buffer, size) memset(buffer, 0, size)
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#define varclr(_var) memclr(_var, sizeof(*(_var)))
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#define arrclr(_arr) memclr(_arr, sizeof(_arr))
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#define arrcount(_arr) ( sizeof(_arr) / sizeof(_arr[0]) )
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static inline uint8_t const * descriptor_next(uint8_t const p_desc[])
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{
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return p_desc + p_desc[DESCRIPTOR_OFFSET_LENGTH];
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}
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static inline uint8_t descriptor_typeof(uint8_t const p_desc[])
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{
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return p_desc[DESCRIPTOR_OFFSET_TYPE];
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}
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//------------- Conversion -------------//
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/// form an uint32_t from 4 x uint8_t
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static inline uint32_t u32_from_u8(uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t u32_from_u8(uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4)
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{
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return ( ((uint32_t) b1) << 24) + ( ((uint32_t) b2) << 16) + ( ((uint32_t) b3) << 8) + b4;
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}
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static inline uint8_t u16_high_u8(uint16_t u16) ATTR_CONST ATTR_ALWAYS_INLINE;
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static inline uint8_t u16_high_u8(uint16_t u16)
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{
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return (uint8_t) ( ((uint16_t) (u16 >> 8)) & 0x00ff);
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}
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static inline uint8_t u16_low_u8(uint16_t u16) ATTR_CONST ATTR_ALWAYS_INLINE;
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static inline uint8_t u16_low_u8(uint16_t u16)
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{
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return (uint8_t) (u16 & 0x00ff);
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}
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static inline uint16_t u16_le2be(uint16_t u16) ATTR_CONST ATTR_ALWAYS_INLINE;
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static inline uint16_t u16_le2be(uint16_t u16)
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{
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return ((uint16_t)(u16_low_u8(u16) << 8)) | u16_high_u8(u16);
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}
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//------------- Min -------------//
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static inline uint8_t min8_of(uint8_t x, uint8_t y) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint8_t min8_of(uint8_t x, uint8_t y)
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{
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return (x < y) ? x : y;
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}
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static inline uint16_t min16_of(uint16_t x, uint16_t y) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint16_t min16_of(uint16_t x, uint16_t y)
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{
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return (x < y) ? x : y;
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}
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static inline uint32_t min32_of(uint32_t x, uint32_t y) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t min32_of(uint32_t x, uint32_t y)
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{
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return (x < y) ? x : y;
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}
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//------------- Max -------------//
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static inline uint32_t max32_of(uint32_t x, uint32_t y) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t max32_of(uint32_t x, uint32_t y)
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{
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return (x > y) ? x : y;
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}
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static inline uint16_t max16_of(uint16_t x, uint16_t y) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint16_t max16_of(uint16_t x, uint16_t y)
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{
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return (x > y) ? x : y;
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}
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//------------- Align -------------//
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static inline uint32_t align32 (uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t align32 (uint32_t value)
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{
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return (value & 0xFFFFFFE0UL);
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}
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static inline uint32_t align16 (uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t align16 (uint32_t value)
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{
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return (value & 0xFFFFFFF0UL);
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}
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static inline uint32_t align_n (uint32_t alignment, uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t align_n (uint32_t alignment, uint32_t value)
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{
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return value & ((uint32_t) ~(alignment-1));
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}
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static inline uint32_t align4k (uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t align4k (uint32_t value)
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{
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return (value & 0xFFFFF000UL);
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}
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static inline uint32_t offset4k(uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t offset4k(uint32_t value)
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{
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return (value & 0xFFFUL);
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}
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//------------- Mathematics -------------//
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static inline uint32_t abs_of(int32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint32_t abs_of(int32_t value)
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{
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return (value < 0) ? (-value) : value;
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}
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/// inclusive range checking
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static inline bool is_in_range(uint32_t lower, uint32_t value, uint32_t upper) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline bool is_in_range(uint32_t lower, uint32_t value, uint32_t upper)
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{
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return (lower <= value) && (value <= upper);
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}
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/// exclusive range checking
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static inline bool is_in_range_exclusive(uint32_t lower, uint32_t value, uint32_t upper) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline bool is_in_range_exclusive(uint32_t lower, uint32_t value, uint32_t upper)
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{
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return (lower < value) && (value < upper);
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}
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// TODO use clz
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static inline uint8_t log2_of(uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint8_t log2_of(uint32_t value)
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{
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uint8_t result = 0; // log2 of a value is its MSB's position
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while (value >>= 1)
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{
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result++;
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}
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return result;
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}
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// return the number of set bits in value
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static inline uint8_t cardinality_of(uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint8_t cardinality_of(uint32_t value)
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{
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// Brian Kernighan's method goes through as many iterations as there are set bits. So if we have a 32-bit word with only
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// the high bit set, then it will only go once through the loop
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// Published in 1988, the C Programming Language 2nd Ed. (by Brian W. Kernighan and Dennis M. Ritchie)
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// mentions this in exercise 2-9. On April 19, 2006 Don Knuth pointed out to me that this method
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// "was first published by Peter Wegner in CACM 3 (1960), 322. (Also discovered independently by Derrick Lehmer and
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// published in 1964 in a book edited by Beckenbach.)"
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uint8_t count;
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for (count = 0; value; count++)
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{
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value &= value - 1; // clear the least significant bit set
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}
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return count;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _TUSB_COMMON_H_ */
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/** @} */
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