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Technical Support On-Line Manuals RL-ARM User's Guide (MDK v4) RL-RTX Overview Product Description Product Specification Technical Data Timing Specifications Advantages Your First RTX Application Theory of Operation Timer Tick Interrupt System Task Manager Task Management Idle Task System Resources Scheduling Options Pre-emptive Scheduling Round-Robin Scheduling Cooperative Multitasking Priority Inversion Stack Management User Timers Interrupt Functions Configuring RL-RTX Configuration Options Tasks Stack Size Stack Checking Run in Privileged Mode Hardware Timer Round-Robin Multitasking User Timers FIFO Queue Buffer Idle Task Error Function Create New RTX_Config.c Configuration Macros Alternate Tick Timer Low Power RTX Library Files Using RL-RTX Writing Programs Include Files Defining Tasks Multiple Instances External References Using a Mailbox SWI Functions SVC Functions Debugging System Info Task Info Event Viewer Usage Hints ARM7/ARM9 Version Cortex-M Version Create New RTX Application Function Reference Event Flag Management Routines Mailbox Management Routines Memory Allocation Routines Mutex Management Routines Semaphore Management Routines System Functions Task Management Routines Time Management Routines User Timer Management Routines RL-FlashFS RL-TCPnet RL-CAN RL-USB Example Programs Library Reference Appendix |
Run in Privileged ModeRTX Library version for Cortex™-M devices allows to select the running mode of all user tasks. User tasks may run in two modes:
In privileged mode user may access and configure the system and control registers like NVIC interrupt controller etc. This is however not allowed from unprivileged mode. An access to NVIC registers from unprivileged mode will result in Hard Fault.
You can enable the privileged mode for old projects. The existing code will run without any modifications when RTX_Config.c configuration file is replaced with a new one and a project is recompiled for a new Cortex™-M RTX Kernel library. Tasks are not protected in privileged mode and you may configure the system for example the interrupts from any task. Privileged mode is disabled by default. This allows all tasks to run in protected mode. The tasks are not allowed to change system settings, change interrupts etc. The user has two options:
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