arm: use structures to manipulate registers-EEWORLD

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Use structures to manipulate registers:

//When assigning and retrieving register values, pay attention to the length of the register. Some register values are only 8 bits.

//Also note, use volatile to modify register variables. volatile reference http://www.cnblogs.com/mylinux/p/4630749.html

//addr.h

typedef unsigned int S3C24X0_REG32;

/* NAND FLASH (see S3C2410 manual chapter 6) */

typedef struct {

S3C24X0_REG32 NFCONF;

S3C24X0_REG32 NFCMD;

S3C24X0_REG32 NFADDR;

S3C24X0_REG32 NFDATA;

S3C24X0_REG32 NFSTAT;

S3C24X0_REG32 NFECC;

} S3C2410_NAND;

//nand.c

static S3C2410_NAND* s3c2410nand = (S3C2410_NAND *)0x4e000000;

//In this way, s3c2410nand represents the starting address of the register group.

//&s3c2410nand->NFCMD represents the address of the NFCMD register.

//s3c2410nand->NFCMD represents the value of the NFCMD register.

//When assigning and retrieving register values, pay attention to the length of the register. Some register values are only 8 bits.

//Also note, use volatile to modify register variables.

/* Read data */

static unsigned char s3c2410_read_data(void)

{

volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFDATA;

return *p;

}

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