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Schedule and Syllabus

Schedule and Syllabus. Lecture Linux Device Drivers Linux IPC and Synchronization Embedded Networking Distributed Control Safety Lab Interrupt Driven Device Driver Project of your Choice Quiz (11/13) Timing analysis (Timing Diagrams)

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Schedule and Syllabus

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  1. Schedule and Syllabus • Lecture • Linux Device Drivers • Linux IPC and Synchronization • Embedded Networking • Distributed Control • Safety • Lab • Interrupt Driven Device Driver • Project of your Choice • Quiz (11/13) • Timing analysis (Timing Diagrams) • RTOS Basics (Latency, Signal, Wait, Multi-Threading, Resources) • Process/Thread Synchronization • Device Drivers in Linux • Synchronization and IPC in Linux CSE 466 – Fall 2000 - Introduction - 1

  2. Lab Discussion • The Sonar: Where you need capacitors • The Intrinsyc Board and Breakout Board Overview • Hardware • Boot Sequence and Options • Power Supply Setup w/ Sonar • Programmed I/O from Kernel Space (In the Device Driver) • GPDR • GPSR • GPCR • GPLR • Use Port0 to Read (GPIO 5 or 6 works for sure) (INIT) • Use Port1 to Write (GPIO 11,12,13 work for sure) (ECHO) CSE 466 – Fall 2000 - Introduction - 2

  3. Reference • Cerfboard HW spec • device driver skeleton CSE 466 – Fall 2000 - Introduction - 3

  4. Driver Template #define SONAR_DEV_MAJOR 23 /* arbitary choice for major number */ #define SONAR_IDENT "Sonar Device Driver" #define SONAR "Sonar" /* Useful GPIO macros are defined in the linux/include/asm-arm/arch/SA-1100.h */ /* --- function declarations --- */ …. /* The file operation struct. You should not need to change this */ static struct file_operations hello_file_ops = {NULL, NULL, Sonar_read, Sonar_write, NULL,NULL,NULL,NULL,Sonar_open,NULL,hello_release,NULL,NULL }; int Sonar_init(void) { // gets called during system boot printk("\n\nSonar_init called\n\n"); if (lock==true) { printk("Device Sonar already installed .\n"); return -1; }; lock=true; if (register_chrdev(Sonar_DEV_MAJOR,Sonar,&Sonar_file_ops)) { printk("%s, cannot register to major device %d\n", Sonar_IDENT,Sonar_DEV_MAJOR); return 1; } else { printk("Installed %s\n",Sonar_IDENT); return 0; } } CSE 466 – Fall 2000 - Introduction - 4

  5. Driver Template int Sonar_open(struct inode *inode,struct file *file) { /* Grab any resources our driver needs, including interrupt lines, memory ranges, ports */ /* register interrupt routines */ /* manage mutual exclusion if necessary */ return 0; } int Sonar_release(struct inode *inode,struct file *file) { /* Release any resources our driver has */ return 0; } static ssize_t Sonar_read(struct file * file, char * buffer, size_t count, loff_t *ppos) { // be sure to honor blocking/nonblocking settings from open /* Use the function below to copy from kernel to user space */ // __copy_to_user((void*)buffer,(void *)str,count)) return 0; } static ssize_t Sonar_write(struct file * file, const char * buffer, size_t count, loff_t *ppos) { // be sure to honor blocking/nonblocking settings /* Use the function below to copy from user to kernel space */ // __copy_from_user((void*)str,(void *)buffer,count)) return 0; } CSE 466 – Fall 2000 - Introduction - 5

  6. Back to Sonar Driver • Simple case CSE 466 – Fall 2000 - Introduction - 6

  7. Sonar w/ Better Properties CSE 466 – Fall 2000 - Introduction - 7

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