创维特试验箱上现步进电机的运转。.docVIP

嵌入式系统实验报告 一、实验时间 2015年5月5日14:30~21:30 二、实验地点 一实验楼401机房 三、实验目的 1、在创维特试验箱上实现步进电机的运转。 四、实验步骤 1、了解步进电机的运作方式。 2、编译驱动代码 代码： static struct timer_list ttimer; static int Device_Open = 0; static int num=2; /*used to control the speed of the stepper*/ static enum{off,clockwise,anticlockwise} status=off; /*used to indicate and set the status of the stepper*/ static int row=0; unsigned char pulse_table[] = { 0x05, 0x09, 0x0a, 0x06, }; static char* out_base; /* kernel addr*/ int device_ioctl(struct inode *,struct file *,unsigned int ,unsigned long ); static void time_tick(unsigned long data) { static int i=0; // printk(time_tick\n); switch(status) { case off: break; case clockwise: if(++i==num){ i=0; if( row == 4 ) row = 0; writeb(pulse_table[row++],out_base); } ttimer.expires=jiffies+5; //set timer add_timer(ttimer); //add timer break; case anticlockwise: if(++i==num){ i=0; if( row == -1 ) row = 3; writeb(pulse_table[row--],out_base); } ttimer.expires=jiffies+5; //set timer add_timer(ttimer); //add timer break; default: break; } } /* This function is called whenever a process attempts * to open the device file */ static int device_open(struct inode *inode, struct file *file) { printk(Device Open\n); /* We dont want to talk to two processes at the * same time */ if (Device_Open) return -EBUSY; Device_Open++; MOD_INC_USE_COUNT; return 0; } /* This function is called when a process closes the * device file. It doesnt have a return value because * it cannot fail. Regardless of what else happens, you * should always be able to close a device (in 2.0, a 2.2 * device file could be impossible to close). */ static int device_release(struct inode *inode, struct file *file) { printk((Device Release\n)); /* Were now ready for our next caller */ Device_Open --; MOD_DEC_USE_COUNT; return 0; } /* This fu