GEC2440A 按键 用扫描按键方式实现Linux 驱动程序实现

/*====================================================================== A tangjinxing driver as an example of char device drivers The initial developer of the original code is Baohua Song <author@linuxdriver.cn>. All Rights Reserved. ======================================================================*/ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/kernel.h> /* printk() */ #include <linux/slab.h> /* kmalloc() */ #include <linux/fs.h> /* everything... */ #include <linux/errno.h> /* error codes */ #include <linux/types.h> /* size_t */ #include <linux/proc_fs.h> #include <linux/fcntl.h> /* O_ACCMODE */ #include <linux/seq_file.h> #include <linux/cdev.h> #include <linux/sched.h> #include <asm/hardware.h> #include <asm/system.h> /* cli(), *_flags */ #include <asm/uaccess.h> /* copy_*_user */ #include"keydev.h" #include "key.h" int KEY_MAJOR = 0; /*预设的key的主设备号 "0"表示动态分配内存*/ #define MEM_CLEAR 0x1 int write_key=0; /*记入按键下该按键之前的按键值*/ unsigned int New_Key=NO_KEY; unsigned int Old_Key=NO_KEY; unsigned int key1; unsigned int key2; /*key设备结构体*/ struct key_dev { struct cdev cdev; /*cdev结构体*/ unsigned char mem[KEY_SIZE]; /*全局内存*/ }; struct key_dev *key_devp; /*设备结构体指针*/ struct KeyValue key={0}; /*自定义led结构体*/ /*****************************功能函数*********************************************/ /*开发板寄存器初始化*/ void led_init(void) { /*led寄存器 初始化*/ volatile unsigned int temp=0; temp=__raw_readl(rGPFCON); temp &= ~((3<<8) | (3<<10) | (3<<12) | (3<<14));//将rGPFCON控制寄存器高八位置零 temp |=((1<<8) | (1<<10) | (1<<12) | (1<<14));//初始化rGPFCON为0x5500 __raw_writel(temp,rGPFCON); // temp=__raw_readl(rGPFUP); temp |=((1<<4) | (1<<5) |(1<<6) | (1<<7) );//将rGPFUP控制寄存器高四位变为可用；高四位置’1‘ __raw_writel(temp , rGPFUP); // temp=__raw_readl(rGPFDAT); temp |= ( (1<<4) | (1<<5) | (1<<6) |(1<<7) );//灯全灭 __raw_writel(temp,rGPFDAT); printk("<0>" "scull_ledopen\n"); /*初始化完成*/ } /*控制led灯程序*/ void led_value(int led_num, int led_stata) { volatile unsigned int temp=0; switch(led_num) { case LED1: if(ON==led_stata) { //输出低电平灯亮 temp=__raw_readl(rGPFDAT); temp &= ~(1<<4);//LED_1亮 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "-----LED1 light\n"); } else { //输出高电平灯灭 temp=__raw_readl(rGPFDAT); temp |=(1<<4);//LED_1灭 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "*****LED1 shut up\n"); } break; case LED2: if(ON==led_stata) { //输出低电平灯亮 temp=__raw_readl(rGPFDAT); temp &= ~(1<<5);//LED_1亮 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "-----LED2 light\n"); } else { //输出高电平灯灭 temp=__raw_readl(rGPFDAT); temp |=(1<<5);//LED_1灭 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "*****LED2 shut up\n"); } break; case LED3: if(ON==led_stata) { //输出低电平灯亮 temp=__raw_readl(rGPFDAT); temp &= ~(1<<7);//LED_1亮 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "-----LED3 light\n"); } else { //输出高电平灯灭 temp=__raw_readl(rGPFDAT); temp |=(1<<7);//LED_1灭 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "*****LED3 shut up\n"); } break; case LED4: if(ON==led_stata) { //输出低电平灯亮 temp=__raw_readl(rGPFDAT); temp &= ~(1<<6);//LED_1亮 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "-----LED4 light\n"); } else { //输出高电平灯灭 temp=__raw_readl(rGPFDAT); temp |=(1<<6);//LED_1灭 __raw_writel(temp,rGPFDAT); /*打印出寄存器中的值*/ //printk("<0>" "*****LED4 shut up\n"); } break; default: break; } } void beep(unsigned int freq) { /*蜂鸣器初始化*/ volatile unsigned int temp=0; //设置引脚GPB2为Timer功能引 temp=__raw_readl(rGPBCON); temp &=~((1<<2) | (1<<3)); temp |=(1<<3); __raw_writel(temp,rGPBCON); temp=__raw_readl(rGPBUP); temp |=(1<<1); __raw_writel(temp,rGPBUP); //定时器配置寄存器0的前8位置一 //预分频器Prescaler 0配置成255 temp=__raw_readl(rTCFG0); temp |=0xff; __raw_writel(temp,rTCFG0); //定时器配置寄存器0的前8位置一 //预分频器Prescaler 0配置成255 temp=__raw_readl(rTCFG1); temp &=~((1<<4) | (1<<5) | (1<<6) | (1<<7)); temp |=(1<<5); __raw_writel(temp,rTCFG1); //定时器配置寄存器0的前8位置一 //预分频器Prescaler 0配置成255 temp=__raw_readl(rTCNTB1); temp=((50000>>11)*freq); __raw_writel( temp,rTCNTB1); //当定时器数到总数的一半时电平翻转 temp=__raw_readl(rTCMPB1); temp=((50000>>12)*freq); __raw_writel(temp, rTCMPB1); //BIT[11]:Timer 1 auto reload on/off = Interval mode (auto reload) //BIT[10]:Timer 1 output inverter on/off = Inverter off //BIT[9]:Timer 1 manual update = Update TCNTB1 & TCMPB1 //BIT[8]:Timer 1 start/stop = Stop temp=__raw_readl(rTCON); temp &=~((1<<8) | (1<<9) | (1<<10) | (1<<11)); temp |=(1<<9); __raw_writel(temp,rTCON); //设置为auto reload并且Start for Timer 1 //open [9] [8] temp = __raw_readl(rTCON); temp &= ~(0xf<<8); temp |= (1<<11)|(1<<8); __raw_writel(temp,rTCON); temp = __raw_readl(rTCON); temp &=(~(1<<9)); __raw_writel(temp,rTCON); printk("<0>" "----------beep_init scuessful\n"); /*蜂鸣器初始化完毕*/ } /*关闭蜂鸣器*/ void beep_stop(void) { volatile unsigned int temp=0; temp = __raw_readl(rTCON); temp &=(~(1<<8)); __raw_writel(temp,rTCON); } /*********************************key**************************************/ /*键盘寄存器初始化*/ void key_Init(void) { volatile unsigned int temp=0; temp=__raw_readl(rGPFCON); temp &=~( (3<<4) | 3); __raw_writel(temp,rGPFCON); temp=__raw_readl(rGPGCON); temp &=~( (3<<6) | (3<<22) ); __raw_writel(temp,rGPGCON); temp=__raw_readl(rGPFUP); temp |=( (0x1) | (1<<3)); __raw_writel(temp,rGPFUP); temp=__raw_readl(rGPGUP); temp |=((1<<3) | (1<<11)); __raw_writel(temp,rGPGUP); printk("<0>" "key_init()\n"); } /*键盘初始化完成*/ int key_scanf(void) { volatile unsigned int temp=0; temp= __raw_readl(rGPFDAT) ; //printk("rGPFDAT = 0x%x\n",temp); temp=( (~temp) & (0x1 |(0x1<<2) ) ); switch( temp ) { case 0x1: return KEY_1; case 1<<2: return KEY_2; default: break; } temp= __raw_readl(rGPGDAT) ; //printk("rGPGDAT = 0x%x\n",temp); temp=(~temp) & ( (1<<3) | (1<<11) ) ; switch(temp) { case 0x8: return KEY_3; case 0x1<<11: return KEY_4; default: break; } return NO_KEY; } void key_delay(int time) { int i; int j; for( i=0; i<=time; i++) { for(j=0; j<=650; j++); } } /*获取按键值*/ int get_key(void) { key1=key_scanf();//防抖动 key_delay(1000); key2=key_scanf(); if(key1 != key2) return NO_KEY; New_Key=key2; //防重复 //防止按一个按键有多个信号产生；判断连个标志位的值 //由于此函数在while(1)循环中执行，防止无限发送信号，标准位进行判断 if(New_Key == Old_Key) { return NO_KEY; } else { Old_Key=New_Key; return New_Key; } } /*初始化模块结束*/ /*********************************************************************************/ /*文件打开函数*/ int key_open(struct inode *inode, struct file *filp) { #ifdef LED_INIT led_init(); #endif #ifdef KEY_INIT key_Init();//键盘初始化 #endif return 0; } /*文件释放函数*/ int key_release(struct inode *inode, struct file *filp) { return 0; } /* ioctl设备控制函数 */ static int key_ioctl(struct inode *inodep, struct file *filp, unsigned int cmd, unsigned long arg) { /* struct key_dev *dev = filp->private_data; //获得设备结构体指针 switch (cmd) { case MEM_CLEAR: memset(k