原创 【原创】怎么在NIOS中快速定位找到宏定义的声明位置？

刚接触NiosII，看到IO口操作中要用到altera_avalon_pio_regs.h,我在NiosII的安装目录下没有找到，但是编译能通过，后来把搜索范围扩大到整个QuartusII的安装目录终于把它找到，可能版本问题吧，路径如下：

D:\altera\ip\altera\sopc_builder_ip\altera_avalon_pio\inc

其中定义

在Nios的project编译完成后双击文件也可浏览

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#ifndef __ALTERA_AVALON_PIO_REGS_H__
#define __ALTERA_AVALON_PIO_REGS_H__

#include <io.h>

#define IOADDR_ALTERA_AVALON_PIO_DATA(base)           __IO_CALC_ADDRESS_NATIVE(base, 0)
#define IORD_ALTERA_AVALON_PIO_DATA(base)             IORD(base, 0)
#define IOWR_ALTERA_AVALON_PIO_DATA(base, data)       IOWR(base, 0, data)

#define IOADDR_ALTERA_AVALON_PIO_DIRECTION(base)      __IO_CALC_ADDRESS_NATIVE(base, 1)
#define IORD_ALTERA_AVALON_PIO_DIRECTION(base)        IORD(base, 1)
#define IOWR_ALTERA_AVALON_PIO_DIRECTION(base, data)  IOWR(base, 1, data)

#define IOADDR_ALTERA_AVALON_PIO_IRQ_MASK(base)       __IO_CALC_ADDRESS_NATIVE(base, 2)
#define IORD_ALTERA_AVALON_PIO_IRQ_MASK(base)         IORD(base, 2)
#define IOWR_ALTERA_AVALON_PIO_IRQ_MASK(base, data)   IOWR(base, 2, data)

#define IOADDR_ALTERA_AVALON_PIO_EDGE_CAP(base)       __IO_CALC_ADDRESS_NATIVE(base, 3)
#define IORD_ALTERA_AVALON_PIO_EDGE_CAP(base)         IORD(base, 3)
#define IOWR_ALTERA_AVALON_PIO_EDGE_CAP(base, data)   IOWR(base, 3, data)

/* Defintions for direction-register operation with bi-directional PIOs */
#define ALTERA_AVALON_PIO_DIRECTION_INPUT  0
#define ALTERA_AVALON_PIO_DIRECTION_OUTPUT 1

#endif /* __ALTERA_AVALON_PIO_REGS_H__ */

--------------引------------------用-----------------------结----------------------束------------------------------------------

我今天遇到的类似问题的困扰：

譬如“IOWR_ALTERA_AVALON_PIO_DIRECTION(SDA_BASE, OUT);”的语句，怎么在NIOS中快速定位找到IOWR_ALTERA_AVALON_PIO_DIRECTION的定义？？

不过多试两下，找到办法了，笔记一下，就是：

光标定到需要查询的位置，右键选择“Open Declaration”，就自动弹出宏声明的位置所在了。如图：