【Linux c】USB

USB入门：driver+usb read.c+usb write.c

driver.c

#include<linux/init.h>#include<linux/kernel.h>#include<linux/module.h>#include<linux/fs.h>#include<linux/miscdevice.h>#include <linux/types.h>#include <linux/errno.h>#include <linux/mm.h>#include <linux/sched.h>#include <asm/io.h>#include <asm/uaccess.h>#include <linux/slab.h>MODULE_LICENSE("Dual BSD/GPL");static int misc_open(struct inode *nd,struct file *filp){//printk(KERN_ALERT"misc_open success\n");return 0;}static ssize_t misc_read(struct file *filp, char __user *buf, size_t count,loff_t *ppos){printk(KERN_ALERT"In the misc_read() function!\n");char data;int i=0;printk("read ppos =%d\n",(unsigned int)*ppos);    data='A';for(i=0;i<count;i++){if(copy_to_user(buf+i,&data,sizeof(data))){return -EFAULT;   }   printk("read data=%c\n",data);   }//*ppos+=count;printk("read buf=%s\n",buf);return 0;}static ssize_t misc_write(struct file *filp, const char __user *buf, size_t count,loff_t *ppos)                                                              {printk("in the write..\n");printk("write ppos=%d\n",(unsigned int)*ppos);char data;    int i;for(i=0;i<count;i++){printk("buf=%c\n",*(buf+i));if(copy_from_user(&data,buf+i,sizeof(data))){return -EFAULT;}printk("data=%c\n",data);}   //*ppos+=count;      return 0;      }                                                                           struct file_operations misc_ops ={.owner = THIS_MODULE,.open  = misc_open,   .read  = misc_read,.write = misc_write,};struct miscdevice misc={.minor = MISC_DYNAMIC_MINOR,.name = "my_misc_dev",.fops = &misc_ops,};static int zx_init(void){int ret;ret = misc_register(&misc);printk(KERN_ALERT"\t initialized %s!\n",(0==ret)?"successed":"failed");    return ret; }static void zx_exit(void){misc_deregister(&misc);printk(KERN_ALERT"Removing misc_dev...!\n");}module_init(zx_init);module_exit(zx_exit);

usb read.c

#include <stdio.h>#include <string.h>#include <unistd.h>#include <fcntl.h>#include <errno.h>#include <termios.h>#include <stdlib.h>#include <signal.h>#include <sys/stat.h>#include <sys/time.h>#include <sys/signal.h>#include <sys/types.h>#define MAX 100#define FALSE  -1#define TRUE   0 void set_speed(int fd, int speed);int set_Parity(int fd);int OpenDev(char *Dev);void main(void){int fd_usb;int nread;char buff[MAX] = {0};char *usb_dev  = "/dev/ttyS1"; fd_usb = OpenDev(usb_dev);set_speed(fd_usb, 115200);if(set_Parity(fd_usb) == FALSE){       printf("Set Parity Error\n");          return ;       }while(1){//sleep(1);if((nread = read(fd_usb, buff, sizeof(buff)-1)) > 0){  buff[nread+1] = '\0'; printf( "n = %d \n", nread);  printf( "read data =%s \n", buff);   }stpcpy(buff,"");sleep(1);}close(fd_usb);return ;}int OpenDev(char *Dev){    int  fd = open(Dev, O_RDWR);    if (fd == -1){           perror("Can't Open Serial Port");        return -1;      }else{return fd;}          }int speed_arr[] = {B115200,B38400, B19200, B9600, B4800, B2400, B1200, B300,B38400, B19200, B9600, B4800, B2400, B1200, B300, };int name_arr[] = {115200,38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, };void set_speed(int fd, int speed){int i; int status; struct termios Opt;tcgetattr(fd, &Opt); for(i= 0; i < sizeof(speed_arr) / sizeof(int); i++){ if (speed == name_arr[i]) {     tcflush(fd, TCIOFLUSH);     cfsetispeed(&Opt, speed_arr[i]); cfsetospeed(&Opt, speed_arr[i]);   status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0){    perror("tcsetattr fd1"); return;     }  tcflush(fd,TCIOFLUSH);   } }}int set_Parity(int fd){struct termios options;      if(tcgetattr(fd, &options)  !=  0){         perror("SetupSerial 1");           return(FALSE);      }//Enable the receiver and set local modeoptions.c_cflag |= (CLOCAL | CREAD);//Select 8 data bits, 1 stop bit and no parity bitoptions.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;options.c_cflag &= ~CSIZE;options.c_cflag |= CS8;//Disable hardware flow controloptions.c_cflag &= ~CRTSCTS;//Choosing raw inputoptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);//Disable software flow controloptions.c_iflag &= ~(IXON | IXOFF | IXANY);//Choosing raw outputoptions.c_oflag &= ~OPOST;//Set read timeoutsoptions.c_cc[VMIN] = 0;options.c_cc[VTIME] = 10;if(tcsetattr(fd, TCSANOW, &options) != 0){ perror("Setup Serial 3");return (FALSE);  } return (TRUE); }

usb write.c

#include <stdio.h>#include <string.h>#include <unistd.h>#include <fcntl.h>#include <errno.h>#include <termios.h>#include <stdlib.h>#include <signal.h>#include <sys/stat.h>#include <sys/time.h>#include <sys/signal.h>#include <sys/types.h>#define MAX 100#define FALSE  -1#define TRUE   0 void set_speed(int fd, int speed);int set_Parity(int fd);int OpenDev(char *Dev);void main(void){int fd_usb;int fd_misc;int nwrite;char buff[MAX] = "ssweiqqmmiioobgjklptyrewepsswei";char *usb_dev  = "/dev/ttyS0"; char *misc_dev = "/dev/my_misc_dev";fd_misc = OpenDev(misc_dev);fd_usb = OpenDev(usb_dev);set_speed(fd_usb, 115200);if(set_Parity(fd_usb) == FALSE){       printf("Set Parity Error\n");          return ;       }while(1){//read data from misc deviceread(fd_misc, buff, sizeof(buff)-1);printf("read from misc device:%s\n",buff);//write to /dev/ttyS0if((nwrite = write(fd_usb, buff, sizeof(buff)-1)) > 0){ printf("write Len= %d\n",nwrite); }sleep(1);}close(fd_usb);close(fd_misc);return ;}int OpenDev(char *Dev){    int  fd = open(Dev, O_RDWR);    if (fd == -1){           perror("Can't Open Serial Port");        return -1;      }else{return fd;}          }int speed_arr[] = {B115200,B38400, B19200, B9600, B4800, B2400, B1200, B300,B38400, B19200, B9600, B4800, B2400, B1200, B300, };int name_arr[] = {115200,38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, };void set_speed(int fd, int speed){int i; int status; struct termios Opt;tcgetattr(fd, &Opt); for(i= 0; i < sizeof(speed_arr) / sizeof(int); i++){ if (speed == name_arr[i]) {     tcflush(fd, TCIOFLUSH);     cfsetispeed(&Opt, speed_arr[i]); cfsetospeed(&Opt, speed_arr[i]);   status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0){    perror("tcsetattr fd1"); return;     }  tcflush(fd, TCIOFLUSH);   } }}int set_Parity(int fd){struct termios options;      if(tcgetattr(fd, &options)  !=  0){         perror("SetupSerial 1");           return(FALSE);      }//Enable the receiver and set local modeoptions.c_cflag |= (CLOCAL | CREAD);//Select 8 data bits, 1 stop bit and no parity bitoptions.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;options.c_cflag &= ~CSIZE;options.c_cflag |= CS8;//Disable hardware flow controloptions.c_cflag &= ~CRTSCTS;//Choosing raw inputoptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);//Disable software flow controloptions.c_iflag &= ~(IXON | IXOFF | IXANY);//Choosing raw outputoptions.c_oflag &= ~OPOST;//Set read timeoutsoptions.c_cc[VMIN] = 0;options.c_cc[VTIME] = 10;if(tcsetattr(fd,TCSANOW,&options) != 0){ perror("SetupSerial 3");return (FALSE);  } return (TRUE); }

第二组：

driver:

misc.c

#include<linux/init.h>#include<linux/kernel.h>#include<linux/module.h>#include<linux/fs.h>#include<linux/miscdevice.h>#include <linux/types.h>#include <linux/errno.h>#include <linux/mm.h>#include <linux/sched.h>#include <asm/io.h>#include <asm/uaccess.h>#include <linux/slab.h>MODULE_LICENSE("Dual BSD/GPL");static int misc_open(struct inode *nd,struct file *filp){return 0;}static ssize_t misc_read(struct file *filp, char __user *buf, size_t count,loff_t *ppos){printk(KERN_ALERT"In the misc_read() function!\n");char data;int i=0;printk("read ppos =%d\n",(unsigned int)*ppos);    data='A';for(i=0;i<count;i++){if(copy_to_user(buf+i,&data,sizeof(data))){return -EFAULT;   }   printk("read data=%c\n",data);   }printk("read buf=%s\n",buf);return 0;}static ssize_t misc_write(struct file *filp, const char __user *buf, size_t count,loff_t *ppos)                                                              {printk("in the write..\n");printk("write ppos=%d\n",(unsigned int)*ppos);char data;    int i;for(i=0;i<count;i++){printk("buf=%c\n",*(buf+i));if(copy_from_user(&data,buf+i,sizeof(data))){return -EFAULT;}printk("data=%c\n",data);}      return 0;      }                                                                           struct file_operations misc_ops ={.owner = THIS_MODULE,.open  = misc_open,   .read  = misc_read,.write = misc_write,};struct miscdevice misc={.minor = MISC_DYNAMIC_MINOR,.name = "my_misc_dev",.fops = &misc_ops,};static int zx_init(void){int ret;ret = misc_register(&misc);printk(KERN_ALERT"\t initialized %s!\n",(0==ret)?"successed":"failed");    return ret; }static void zx_exit(void){misc_deregister(&misc);printk(KERN_ALERT"Removing misc_dev...!\n");}module_init(zx_init);module_exit(zx_exit);

usb.c

#include <stdio.h>/* Standard input/output definitions */#include <string.h>/* String function definitions */#include <unistd.h>/* UNIX standard function definitions */#include <fcntl.h>/* File control definitions */#include <errno.h>/* Error number definitions */#include <termios.h>/* POSIX terminal control definitions */#include<stdlib.h>#include<signal.h>#include<sys/stat.h>#include <sys/time.h>#include <sys/signal.h>#define MAX 100/* * 'open_port()' - Open serial port /dev/ttyS0 * Returns the file descriptor on success or -1 on error. */ void open_usb();void open_misc();char w_buf[MAX] = {0};char r_buf[MAX] = {0};void main(){//strcmp(w_buf,"abcdefghijklmnop");//read data from misc device//open_misc(); strcpy(r_buf,"abcdefghijklmnop"); //write data to usb deviceopen_usb();return ;}void open_usb(){int fd; /* File descriptor for the port */struct termios options;int status;int n;fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);if(fd != -1){printf("open /dev/ttyS0 succeed!\n");//set blockingfcntl(fd, F_SETFL, 0);//set baud rates tcgetattr(fd, &options);/* * Set the baud rates to 115200 */cfsetispeed(&options, B115200);cfsetospeed(&options, B115200);/* * Enable the receiver and set local mode */options.c_cflag |= (CLOCAL | CREAD);/* * Select 8 data bits, 1 stop bit and no parity bit */options.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;options.c_cflag &= ~CSIZE;options.c_cflag |= CS8;/* * Disable hardware flow control */options.c_cflag &= ~CRTSCTS;/* * Choosing standard input */options.c_lflag |= (ICANON | ECHO | ECHOE);/* * Disable software flow control */options.c_iflag &= ~(IXON | IXOFF | IXANY);/* * Choosing raw output */options.c_oflag &= ~OPOST;/* * Set read timeouts */options.c_cc[VMIN] = 8;options.c_cc[VTIME] = 10;     if(strlen(r_buf) > 1){while(1){n = write(fd, r_buf, sizeof(r_buf)-1);if(n < 0){//fputs("write() fo 4 bytes failed!\n", stderr);printf("write to dev/ttyS1 failed!\n");}elseprintf("write to dev/ttyS1 device:%s\n",r_buf);sleep(1);}}elseprintf("r_buf = ""!\n");status = tcsetattr(fd, TCSADRAIN, &options);if (status != 0){printf("tcsetattr failed!\n");            return;}}else{//perror("open_port: Unable to open /dev/ttyS0 -");printf("/dev/ttyS0 open failed!\n");}}void open_misc(){int fd;int flag;stpcpy(r_buf,"");fd = open("/dev/my_misc_dev",O_RDWR | O_NOCTTY | O_NDELAY);if(fd != -1){fcntl(fd, F_SETFL, 0);printf("open misc device succeed!\n");    read(fd, r_buf, sizeof(r_buf)-1);printf("read from misc device:%s\n",r_buf);}else{printf("Misc device open failure\n");}close(fd);}