nrf.rar_ nrf_linux 24L01_nRF_nRF2401_nrf linux

#include<linux/module.h> #include<linux/init.h> #include<linux/kernel.h> #include<linux/config.h> #include<linux/fs.h> #include<asm/uaccess.h> #include<linux/version.h> #include<linux/irq.h> #include<linux/poll.h> #include<linux/delay.h> #include<asm/arch/irq.h> #include<asm/hardware.h> #include<linux/spinlock.h> #include<asm/arch/S3C2440.h> //为了使用GPIO端口定义 #include<linux/devfs_fs_kernel.h> //为了使用devfs_register和devfs_unregister函数 MODULE_LICENSE("GPL"); #define DEVICE_NAME "nRF2401" #define MAJOR_NUM 233 #define MINOR_NUM 0 static devfs_handle_t devfs_handle=NULL; static devfs_handle_t devfs_nRF2401_dir=NULL; //在/dev下建立相应的目录 #define DEV_DIR "nRF2401" static DECLARE_WAIT_QUEUE_HEAD(nRF2401_wait); static int ready=0; #define DR1 GPIO_G9 //定义GPIO口与NRF2440的接口 #define PWR_UP GPIO_B6 #define CLK1 GPIO_G7 #define MISO GPIO_G5 #define MOSI GPIO_G6 #define CE GPIO_E13 #define CS GPIO_E12 #define LED GPIO_F4 #define PACKETLEN 22 unsigned char RData[PACKETLEN]; //指向驱动程序申请的用于存放接收数据的内存区域 static struct nRF2401Config{ unsigned char n; //配置字长度 unsigned char buf[15];//配置字数组 }config={15, { 0x00, //接收通道2有效数据长度 0xB0, //接收通道1有效数据长度 0x00,0x00,0x00,0x00,0x00, //接收通道2地址,最长5字节,缺少位用0填 0x00,0xcc,0xcc,0xcc,0xcc, //接收通道1地址,最长5字节,缺少位用0填 0x83, //32位地址长度(bit7-bit2);16bit CRC(bit1);CRC enable 0x4f,//单通道接收(bit7);ShockBrust(bit6);速率(bit5);晶振频率(bit4-bit2);功率(bit2-bit0) 0x01 //频道(bit7-bit1);发送/接收(bit0:0/1) } }; static void SPI_init(void){ //IO initial set_gpio_ctrl(DR1|GPIO_MODE_ALT0);//设置为DR1为中断模式 set_gpio_ctrl(CE|GPIO_MODE_OUT|GPIO_PULLUP_EN); set_gpio_ctrl(CS|GPIO_MODE_OUT|GPIO_PULLUP_EN); set_gpio_ctrl(PWR_UP|GPIO_MODE_OUT|GPIO_PULLUP_EN); set_gpio_ctrl(CLK1|GPIO_MODE_ALT1|GPIO_PULLUP_EN);//设置引脚为SPI set_gpio_ctrl(MISO|GPIO_MODE_ALT1|GPIO_PULLUP_EN); set_gpio_ctrl(MOSI|GPIO_MODE_ALT1|GPIO_PULLUP_EN); set_gpio_ctrl(LED|GPIO_MODE_OUT|GPIO_PULLUP_EN);//设置LED引脚 write_gpio_bit(PWR_UP,0);//初始化nFR2401引脚 write_gpio_bit(CE,0); write_gpio_bit(CS,0); write_gpio_bit(LED,1);//关LED //REGISTER initial SPPRE1=0xff; //设置波特率为132,300bps SPCON1=0x18;//设置为查询方式 printk("SPI configured\n"); } static void SPI_poll_done(void){ int ncount=0; while(!(SPSTA1&0x01)){ //判断SPI发送寄存器是否已经准备好 ncount++; if(ncount>=5000){ printk("SPI state poll failed\n"); // return -1; break; } } //return 0; } static void SPI_tx_data(unsigned char data){ //通过SPI发送数据 SPI_poll_done(); SPTDAT1=data; SPI_poll_done(); } void RX_Packet(void) { //读取数据包 unsigned char i; for(i=0;i<PACKETLEN;i++) { SPI_tx_data(0xff); RData[i]=SPRDAT1; } printk("recevie RX_Packet\n"); } static void nRF2401_ON(void) { //nRF2401上电 write_gpio_bit(CE,0); write_gpio_bit(CS,0); write_gpio_bit(PWR_UP,1); mdelay(3);//延时3ms,nrf2401进入待机模式 printk("nRF2401 on\n"); } static void nRF2401_Config(void) { //nRF2401配置 unsigned char i; write_gpio_bit(CE,0); write_gpio_bit(CS,1); udelay(10); //延时10us for(i=0;i<config.n;i++){ SPI_tx_data(config.buf[i]); } write_gpio_bit(CS,0); write_gpio_bit(CE,1);//激活接收模式,经过202us内部延时后进入接收模式 printk("nRF2401 configed\n"); } static void nRF2401_Close(void)//关闭nRF2401 { write_gpio_bit(CE,0); write_gpio_bit(CS,0); write_gpio_bit(PWR_UP,0); printk("nRF2401 close\n"); } static void nRF2401_irq(int irq,void *dev_id,struct pt_regs *reg) { unsigned int flags; write_gpio_bit(LED,0);//开LED,表示接收到数据 save_flags(flags); //中断处理时禁止再次中断 cli(); //printk("nRF2401have prepared the datas!\n"); //中断处理函数 //mdelay(1000); RX_Packet(); restore_flags(flags); write_gpio_bit(LED,1);//关LED,表示读完数据 ready=1; wake_up_interruptible(&nRF2401_wait); //通知应用程序有数据可读 } static int requestb_irq(void) //中断申请函数 { set_external_irq(IRQ_EINT17,EXT_RISING_EDGE,GPIO_PULLUP_DIS);//DR1上升沿触发 if(request_irq(IRQ_EINT17,&nRF2401_irq,SA_INTERRUPT,DEVICE_NAME,&nRF2401_irq)){ printk(DEVICE_NAME" request_irq failed!\n"); return -1; } printk("irq succes!\n"); return 0; } static void freeb_irq(void) { free_irq(IRQ_EINT17,nRF2401_irq); } static int nRF2401_open(struct inode *inode,struct file *file) { ready=0; nRF2401_ON(); nRF2401_Config(); printk(DEVICE_NAME" open\n"); MOD_INC_USE_COUNT; return 1; } static int nRF2401_release(struct inode *inode,struct file *file) { nRF2401_Close(); printk(DEVICE_NAME" release\n"); MOD_DEC_USE_COUNT; return 1; } static ssize_t nRF2401_read(struct file *file,char *buf,size_t len,loff_t *off) { __copy_to_user(buf,RData,sizeof(RData)); ready=0; return sizeof(RData); } /*static ssize_t nRF2401_write(struct file *file,const char *buf,size_t len,loff_t *off) { __copy_from_user(&,buf,sizeof()); return sizeof(); }*/ static unsigned int nRF2401_select(struct file *file,struct poll_table_struct *wait) { //printk("poll ready is%d\n",ready); if(ready)return 1; poll_wait(file,&nRF2401_wait,wait);//使外部应用程序阻塞,等待数据准备好 return 0; } static struct file_operations nRF2401_fops={ owner: THIS_MODULE, open:nRF2401_open, release:nRF2401_release, //ioctl:nRF2401_ioctl, read:nRF2401_read, // write:nRF2401_write, poll:nRF2401_select, }; static int nRF2401_init(void) { int ret; ret=register_chrdev(MAJOR_NUM,DEVICE_NAME,&nRF2401_fops); if(ret) { printk(DEVICE_NAME" register failure\n"); return ret; } else printk(DEVICE_NAME" register success\n"); ret=requestb_irq(); if(ret){ ret=unregister_chrdev(MAJOR_NUM,DEVICE_NAME); if(ret) { printk(DEVICE_NAME" unregister failure\n"); } else printk(DEVICE_NAME" unregister success\n"); return ret; } devfs_nRF2401_dir=devfs_mk_dir(NULL,DEV_DIR,NULL); devfs_handle=devfs_register(devfs_nRF2401_dir,DEVICE_NAME,DEVFS_FL_DEFAULT,MAJOR_NUM,MINOR_NUM,S_IFCHR|S_IRUSR|S_IWUSR,&nRF2401_fops,NULL); SPI_init(); return ret; } static void nRF2401_exit(void) { int ret; devfs_unregister(devfs_handle); freeb_irq(); ret=unregister_chrdev(MAJOR_NUM,DEVICE_NAME); if(ret) { printk(DEVICE_NAME" unregister failure\n"); } else printk(DEVICE_NAME" unregister success\n"); } module_init(nRF2401_init); module_exit(nRF2401_exit);