#include <linux/module.h> // Needed by all modules#include <linux/kernel.h> // Needed for KERN_ALERT#include <linux/init.h>   // Needed for the macros#include <asm/io.h>#include <linux/types.h>#include <linux/fcntl.h>#include <sys/syscall.h>#include <linux/errno.h>#include <linux/fs.h>#include <linux/unistd.h>#include <linux/wrapper.h>#include <asm/uaccess.h>#define da_major 152typedef volatile unsigned int AT91_REG;//#include <linux/modversions.h>MODULE_LICENSE("GPL");static int da_open(struct inode *,struct file *);static ssize_t da_write(struct file *,const char *,size_t,loff_t *);static int da_close(struct inode *,struct file *); static int da_open(struct inode *inode,struct file *file){	//PIO A基地址ffff f400	//PIO C基地址ffff f800	//PMC基地址ffff fc00  AT91_REG *PIO_PDR=0;     AT91_REG *PIO_ASR=0;     AT91_REG *PIO_PER=0;     AT91_REG *PIO_OWER=0;    AT91_REG *PIO_OER=0;     AT91_REG *PIO_ODSR=0;    AT91_REG *PMC_PCER=0;           PIO_PDR = ioremap((unsigned long)0xfffff404,(unsigned long)1);      PIO_ASR = ioremap((unsigned long)0xfffff470,(unsigned long)1);      PIO_PER = ioremap((unsigned long)0xfffff800,(unsigned long)1);      PIO_OWER = ioremap((unsigned long)0xfffff8a0,(unsigned long)1);      PIO_ODSR = ioremap((unsigned long)0xfffff838,(unsigned long)1);      PIO_OER = ioremap((unsigned long)0xfffff810,(unsigned long)1);      *PIO_PDR=0X26;//禁止PA1,2,5I/O功能      *PIO_ASR=0X26;//PA1,2,5選擇外圍功能A      *PIO_PER=0x6000;//使能PC14I/O功能，DA的清零信號      *PIO_OER=0x6000;//PC14輸出使能      *PIO_OWER=0x6000;//PC14輸出寫使能      *PIO_ODSR=0x0;//PC14輸出0，將DA輸出清零            PMC_PCER = ioremap((unsigned long)0xfffffc10,(unsigned long)1);      *PMC_PCER=0X2000;//使能SPI外圍時鐘      *PIO_ODSR=0x6000;//將清零信號置1   return 0;}static ssize_t da_write(struct file *file,const char *buffer,size_t count,loff_t *offset){ char value;//SPI define  AT91_REG *SPI_CR=0;  //SPI控制寄存器，使能SPI  AT91_REG *SPI_MR=0;  //SPI模式寄存器，設定主機模式，選擇NPCS2  AT91_REG *SPI_TDR=0; //SPI發送數據寄存器  //AT91_REG *SPI_SR=0;  //SPI狀態寄存器，用于檢測TDRE  AT91_REG *SPI_CSR2=0; //SPI片選寄存器，設定數據發送時序      SPI_CSR2 = ioremap((unsigned long)0xfffe0038,(unsigned long)1);      SPI_MR = ioremap((unsigned long)0xfffe0004,(unsigned long)1);      SPI_CR = ioremap((unsigned long)0xfffe0000,(unsigned long)1);      //SPI_SR = ioremap((unsigned long)0xfffe0010,(unsigned long)1);      SPI_TDR = ioremap((unsigned long)0xfffe000c,(unsigned long)1);      *SPI_CSR2=0x30603; //Tcss約33ns，spck約7.4M      *SPI_MR=0x30001;  //選擇NPCS2，主機模式      *SPI_CR=0x01;     //使能SPI      while(count>0)      { get_user(value,buffer++);        *SPI_TDR=value;        count--;      }              return (count);  	}static int da_close(struct inode *inode,struct file *file){	return 0;}struct file_operations da_fops ={	open:da_open,	write:da_write,	release:da_close,};int da_init(void){	int rc;	rc=register_chrdev(da_major,"spi2",&da_fops);	if (rc<0)	{		printk(KERN_WARNING "da:can't get major %d\n",da_major);		return rc;	}	printk(KERN_INFO "da:get major %d\n",da_major);	return 0;}	int init_module(void){	return da_init();}void cleanup_module(void){	unregister_chrdev(da_major,"spi2");	printk(KERN_ALERT "Goodbye\n");}