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| ThreadX for SH |  |
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| TheadX | ||||||||||||||||||||||||||
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Express Logic's ThreadX® Real-Time Operating System (RTOS) is available from and supported by Green Hills Software. ThreadX is fully integrated with the Green Hills Software MULTI® Integrated Development Environment, providing Optimizing Compilers, Source Debugger, Graphical Project Builder and many other powerful tools for development of embedded application. |
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| Highlights | ||||||||||||||||||||||||||
 Small footprint (sizes in bytes):Instruction area size 3-20K Global data area 696 Thread control block 144 Queue control block 44 Event Flag control block 28 Timer control block 56 Semaphore control block 32 Block Memory control block 48 Byte Memory control block 52  |
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Fast Execution (20MHz, 0 wait-states, SH3): context switch 6.8us tx_thread_suspend 14.6us tx_thread_resume 11.6us tx_thread_relinquish 4.8us tx_semaphore_get 4.6us tx_semaphore_put 4.6us tx_queue_send 7.6us tx_queue_receive 7.6us tx_event_flags_set 6.4us tx_event_flags_get 7.0us tx_block_allocate 5.6us tx_block_release 5.2us tx_byte_allocate 6.4us tx_byte_release 7.8us |
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| SH Optimizations | ||||||||||||||||||||||||||
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ThreadX optimizes context switching on the Hitachi SH. When context switching occurs inside of a ThreadX service call, only the registers preserved across function calls are saved as part of the thread's context, i.e. registers R8-R14, PR, MACH, and MACL.
A similar technique is used in interrupt handling. On the front end of interrupt service routines, only the compiler's scratch registers are saved initially (registers R0-R7). The full register set is saved only if thread preemption is required. | ||||||||||||||||||||||||||
| Further Optimizations for the SH3 | ||||||||||||||||||||||||||
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ThreadX is further optimized for the SH3. Register Bank 1 (BANK1) is used on the front-end of interrupt context saving for improved performance. When initial context saving is done, Register Bank 0 is available for use - including nested interrupts. | ||||||||||||||||||||||||||
| Improve Your Embedded Development | ||||||||||||||||||||||||||
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Let our extensive experience with Hitachi's SH family of microprocessors help your product development. The ThreadX high-performance real-time kernel, helps improve your product's quality and its time-to-market. In addition, using ThreadX makes it easier to enhance your product in the future.
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