在SDIO.c中有这么一段宏定义：
/* ------------ SDIO registers bit address in the alias region ----------- */
#define SDIO_OFFSET (SDIO_BASE - PERIPH_BASE)
/* --- CLKCR Register ---*/
/* Alias word address of CLKEN bit */
#define CLKCR_OFFSET (SDIO_OFFSET + 0x04)
#define CLKEN_BitNumber 0x08
#define CLKCR_CLKEN_BB (PERIPH_BB_BASE + (CLKCR_OFFSET * 32) + (CLKEN_BitNumber * 4))
/* --- CMD Register ---*/
/* Alias word address of SDIOSUSPEND bit */
#define CMD_OFFSET (SDIO_OFFSET + 0x0C)
#define SDIOSUSPEND_BitNumber 0x0B
#define CMD_SDIOSUSPEND_BB (PERIPH_BB_BASE + (CMD_OFFSET * 32) + (SDIOSUSPEND_BitNumber * 4))
/* Alias word address of ENCMDCOMPL bit */
#define ENCMDCOMPL_BitNumber 0x0C
#define CMD_ENCMDCOMPL_BB (PERIPH_BB_BASE + (CMD_OFFSET * 32) + (ENCMDCOMPL_BitNumber * 4))
/* Alias word address of NIEN bit */
#define NIEN_BitNumber 0x0D
#define CMD_NIEN_BB (PERIPH_BB_BASE + (CMD_OFFSET * 32) + (NIEN_BitNumber * 4))
/* Alias word address of ATACMD bit */
#define ATACMD_BitNumber 0x0E
#define CMD_ATACMD_BB (PERIPH_BB_BASE + (CMD_OFFSET * 32) + (ATACMD_BitNumber * 4))
/* --- DCTRL Register ---*/
/* Alias word address of DMAEN bit */
#define DCTRL_OFFSET (SDIO_OFFSET + 0x2C)
#define DMAEN_BitNumber 0x03
#define DCTRL_DMAEN_BB (PERIPH_BB_BASE + (DCTRL_OFFSET * 32) + (DMAEN_BitNumber * 4))
/* Alias word address of RWSTART bit */
#define RWSTART_BitNumber 0x08
#define DCTRL_RWSTART_BB (PERIPH_BB_BASE + (DCTRL_OFFSET * 32) + (RWSTART_BitNumber * 4))
/* Alias word address of RWSTOP bit */
#define RWSTOP_BitNumber 0x09
#define DCTRL_RWSTOP_BB (PERIPH_BB_BASE + (DCTRL_OFFSET * 32) + (RWSTOP_BitNumber * 4))
/* Alias word address of RWMOD bit */
#define RWMOD_BitNumber 0x0A
#define DCTRL_RWMOD_BB (PERIPH_BB_BASE + (DCTRL_OFFSET * 32) + (RWMOD_BitNumber * 4))
/* Alias word address of SDIOEN bit */
#define SDIOEN_BitNumber 0x0B
#define DCTRL_SDIOEN_BB (PERIPH_BB_BASE + (DCTRL_OFFSET * 32) + (SDIOEN_BitNumber * 4))
请问大家到底是什么意思啊！！
我看了下#define PERIPH_BB_BASE （（uint32_t)) 0x42000000 指什么片外地址。
不懂，请大家帮我解释下！！
小弟在这谢过了！
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