interrupt

I am currently working on a bootloader firmware application targeted to STM32F030C8. I specified in my scatter file that the bootloader app will occupy main memory location 0x08000000 to 0x08002FFF (sector 0 to sector 2). I also wrote a main firmware application that is stored from 0x08003000 to 0x0800C800. After downloading both firmware to the MCU internal FLASH, I lauched the main app from the bootloader using the code below: /************************************************************//** * \brief Start the main application if available and correct ****************************************

Is it possible to disable all interrupts with a ASM/C/C++ program to get full control about the processor? If yes -> how? If not -> how do "atomic" operation system calls work (for example entering a critical section)? Thanks for your help! Ludwig Weinzierl In x86 assembly the the commands are sti set interrupt enable bit cli clear interrupt enable bit These commands set and clear the IF Flag . When the IF flag is set, the CPU will handle hardware interrupts, and when it is clear the CPU will ignore hardware interrupts. It does not affect the handling of non-maskable interrupts though, nor

My platform is x86 and x86-64, on Windows. The point of the interrupt priority system is to have the highest priority interrupt beat out the others. To enforce this, I'm guessing that Windows will disable all interrupts of lower level completely, until the ISR for the higher-level interrupt is complete. But if the CPU isn't listening to interrupts, what happens? Do they just silently disappear? Or are they queued in hardware, waiting for interrupts to become enabled again? If they are stored, where? Are there limitations to how many can queue up? What happens if too many interrupts go

Is there any way to run one last command before a running Python script is stopped by being killed by some other script, keyboard interrupt etc. import time try: time.sleep(10) finally: print "clean up" clean up Traceback (most recent call last): File "<stdin>", line 2, in <module> KeyboardInterrupt If you need to catch other OS level interrupts, look at the signal module: http://docs.python.org/library/signal.html Signal Example from signal import * import sys, time def clean(*args): print "clean me" sys.exit(0) for sig in (SIGABRT, SIGBREAK, SIGILL, SIGINT, SIGSEGV, SIGTERM): signal(sig,

I have an embedded project using a STM32F103 (ARM Cortex M3), it is getting a occasionally getting hard fault in release mode. As part of recovery, I would like to retrieve the PC value from before the hard fault and store it for later debugging in the battery backed region. How would I determine the value of the program counter at the point of the hard fault? Obviously, the PC is now set to its location within the hardfault interrupt. Where should I look? It there an address for the normal mode register bank? Thanks! Cortex-M3 uses a quite different model of exception handling from the

This is a followup question to Is a successful send() "atomic"? , as I think it actually concerns system calls in general, not just sends on sockets. Which system calls can be interrupted, and when they are, where is the interruption handled? I've learned about SA_RESTART, but don't exactly understand what is going on. If I make a system call without SA_RESTART, can the call be interrupted by any kind of interrupts (e.g. user input) that don't concern my application, but require the OS to abort my call and do something else? Or is it only interrupted by signals that directly concern my process

Both cause a program to stop executing. It's clear that there must be some differences in how this happens, though. What are they? Summary thread.interrupt() does not stop a thread. It is used for coordination in multi-threaded programs. Don't use it unless you know exactly what you do. Throwing a RuntimeException will (usually) terminate the thread but not necessarily the program. System.exit(int) almost always terminates the program and returns a status code. In unusual situations, System.exit(int) might not actually stop the program. Runtime.getRuntime().halt(int) on the other hand, always