{ printk("[KERN] %s %d\n", __func__, __LINE__); return 0; } static ssize_t mywrite(struct file *filp, const char * __user buf, size_t len, loff_t *off) { printk("[KERN] %s %d\n", __func__, __LINE__); return len; } //=== static struct file_operations fops =...
printk("alloc Device ID failed, value:%d\r\n", retVal); return 1; } else { printk("alloc Device ID success, major:%d minor:%d\r\n", MAJOR(g_DeviceID), MINOR(g_DeviceID)); } cdev_init(&g_Cdev, &chrdevTest_fops); retVal = cdev_add(&g_Cdev, g_DeviceID, 1); if(retVal <...
Ping 是一种常用的网络诊断工具，用于测试与目标服务器之间的连接质量和延迟。通过发送 ICMP（Internet ...
echo n > /sys/module/printk/parameters/console_suspend 是一个用于调整Linux内核行为的命令,特别是在处理系统休眠(suspend)和唤醒(resume)时。以下是该命令的详细解释和执行步骤: 命令含义和作用 echo n > /sys/module/printk/parameters/console_suspend:这条命令的作用是设置内核参数,以便在系统进入休眠...
21 printk(KERN_ERR "read error"); 22 return -EIO; 23 } 24 25 *ppos += wrinten; 26 27 return wrinten; 28 } 29 30 static ssize_t demo_write (struct file *fp, const char __user *user_buf, size_t count, loff_t *ppos) ...
printk("create_proc_entry failed\n"); }#endif...return0; ... }//himax852xes_probe 添加节点例子2 #defineCONFIG_SLT_DEVINFO_CTP#ifdefCONFIG_SLT_DEVINFO_CTP#includestructdevinfo_struct*s_DEVINFO_ctp=NULL;staticchar*temp_ver;staticchar*temp_ver_config;staticvoiddevinfo_ctp_regchar(char*mod...
{ printk(KERN_INFO "Hello, kernel\n"); return 0; } static void __exit hello_exit(void) { printk(KERN_INFO "Goodbye, kernel\n"); } module_init(hello_init); module_exit(hello_exit); EOF echo 'obj-m := hello.o' > Makefile make -C ~/WSL2-Linux-Kernel M=`pwd` modules sudo...
1staticssize_t demo_write (structfile *fp,constchar__user *user_buf, size_t count, loff_t *ppos)2{3charkbuf[10] = {0};45printk(KERN_INFO"user_buf: %p, count: %d, ppos: %lld\n",6user_buf, count, *ppos);78returnsimple_write_to_buffer(kbuf,sizeof(kbuf), ppos, user_buf, ...
1staticssize_t demo_write (structfile *fp,constchar__user *user_buf, size_t count, loff_t *ppos)2{3charkbuf[10] = {0};45printk(KERN_INFO"user_buf: %p, count: %d, ppos: %lld\n",6user_buf, count, *ppos);78returnsimple_write_to_buffer(kbuf,sizeof(kbuf), ppos, user_buf, ...
1、排除驱动程序问题：找到串口芯片的驱动程序，在其中加入往寄存器写数据的函数，加入printk打印接收数据。若正常，则排除驱动程序；2、排除芯片问题：将串口的RX和TX短接，运行minicom发数据，用示波器抓波形分析是否有数据传输。若正常，则排除芯片问题。3、排除cat/echo的问题：若串口是同步模式打开，且...