关于Nios II的数据类型的一点想法
鄙人觉得Nios II HAL自带的数据类型宏真的不好用，而且还有个alt_前缀，移植很麻烦。代码1 alt_types.h
#ifndef __ALT_TYPES_H__
#define __ALT_TYPES_H__
/******************************************************************************
* *
* License Agreement *
* *
* Copyright (c) 2003 Altera Corporation, San Jose, California, USA. *
* All rights reserved. *
* *
******************************************************************************/
/*
* Don't declare these typedefs if this file is included by assembly source.
*/
#ifndef ALT_ASM_SRC
typedef signed charalt_8;
typedef unsigned charalt_u8;
typedef signed short alt_16;
typedef unsigned short alt_u16;
typedef signed long alt_32;
typedef unsigned long alt_u32;
typedef long long alt_64;
typedef unsigned long long alt_u64;
#endif
#define ALT_INLINE __inline__
#define ALT_ALWAYS_INLINE __attribute__ ((always_inline))
#define ALT_WEAK __attribute__((weak))
#endif /* __ALT_TYPES_H__ */
我习惯于使用STM32的数据类型宏，因为都是32位的RISC处理器，所以都是通用的，推荐大家也使用。哈哈，看起来都比较清爽。
代码2 my_types.h
// copy from stm32f10x_type.h
#ifndef MY_TYPES_H_
#define MY_TYPES_H_
typedef signed longs32;
typedef signed short s16;
typedef signed chars8;
typedef signed longconst sc32;/* Read Only */
typedef signed short const sc16;/* Read Only */
typedef signed charconst sc8; /* Read Only */
typedef volatile signed longvs32;
typedef volatile signed short vs16;
typedef volatile signed charvs8;
typedef volatile signed longconst vsc32;/* Read Only */
typedef volatile signed short const vsc16;/* Read Only */
typedef volatile signed charconst vsc8; /* Read Only */
typedef unsigned longu32;
typedef unsigned short u16;
typedef unsigned charu8;
typedef unsigned longconst uc32;/* Read Only */
typedef unsigned short const uc16;/* Read Only */
typedef unsigned charconst uc8; /* Read Only */
typedef volatile unsigned longvu32;
typedef volatile unsigned short vu16;
typedef volatile unsigned charvu8;
typedef volatile unsigned longconst vuc32;/* Read Only */
typedef volatile unsigned short const vuc16;/* Read Only */
typedef volatile unsigned charconst vuc8; /* Read Only */
typedef enum {FALSE = 0, TRUE = !FALSE} bool;
#endif /* MY_TYPES_H_ */
下面给个my_types.h的使用范例。
代码3 PIO寄存器结构体
#include "my_types.h"
// PIO Data structure
typedef struct
{
vu32 DATA : 32;
vu32 DIRECTION : 32;
vu32 INTERRUPT_MASK : 32;
vu32 EDGE_CAPTURE : 32;
}PIO_T; 不错，值得借鉴
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