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RL-ARM User's Guide
RL-RTX Overview Product Description
Basic Functions Interprocess Communications Product Specification Technical Data Timing Specifications How To Use Your First RTX Application Theory of Operation Timer Tick Interrupt System Clock Task Task Management Idle Task System Resources Cooperative Multitasking Round-Robin Multitasking Preemptive Multitasking Priority Inversion Stack Management User Timers Interrupt Functions Configuring RTX Kernel Basic RTX Configuration Tasks Stack Size Stack Checking Run in Privileged Mode Hardware Timer Round-Robin Multitasking Idle Task User Timers Advanced RTX Configuration HW Resources Required Configuration Macros Library Files Using RTX Kernel Writing Programs Include Files Defining Tasks Multiple Instances External References Using a Mailbox SWI Functions SVC Functions Debugging Active Tasks System Info Usage Hints ARM Version Cortex Version Create New RTX Application Function Overview 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 Example Programs Library Reference AppendixTiming Specifications
| nFunction | ARM7™/ARM9™ (µs @60MHz) | Cortex™-M (µs @72MHz) |
|---|---|---|
| Initialize system (os_sys_init), start task | 46.2 | 22.1 |
| Create defined task, no task switch | 17.0 | 8.1 |
| Create defined task, switch task | 19.1 | 9.3 |
| Delete task (os_tsk_delete) | 9.3 | 4.8 |
| Task switch (by os_tsk_delete_self) | 11.2 | 5.1 |
| Task switch (by os_tsk_pass) | 6.6 | 3.9 |
| Task switch (upon set event) | 7.8 | 4.3 |
| Task switch (upon sent semaphore) | 7.7 | 4.4 |
| Task switch (upon sent message) | 8.4 | 4.8 |
| Set event (no task switch) | 2.4 | 1.9 |
| Send semaphore (no task switch) | 1.7 | 1.6 |
| Send message (no task switch) | 4.5 | 2.5 |
| Get own task identifier (os_tsk_self) | 1.2 | 1.5 |
| Interrupt response for IRQ ISR | 1.1 | n/a, see note |
| Maximum interrupt lockout for IRQ ISR's | 3.1 | n/a, see note |
| Maximum interrupt latency for IRQ ISR's (response + lockout) | 4.2 | n/a, see note |
Note
- The table for ARM7™/ARM9™ RTX Kernel library is measured for LPC2138 CPU with the system clock set to 60 MHz, code execution from internal flash and with MAM fully enabled.
- The table for Cortex™-M3 RTX Kernel library is measured for STM32F103RB CPU with the system clock set to 72 MHz, code execution from internal flash, with Flash Latency 2 wait states and the Prefetch Buffer enabled.
- The RTX Kernel for the test is configured for 10 tasks, 10 user timers and stack checking disabled.
- Interrupt response for ISRs includes the ISR prolog as generated by RealView Compilation Tools. The RVCT fast interrupt procedures have the same interrupt response time without the RTX kernel.
- The RTX Kernel library for Cortex™-M does not disable interrupts. Interrupt response time for ISRs is the same as without the RTX kernel.
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