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DioneOS News

Full verification of the system version for ARM Cortex-M3

2013-11-14

Version for ARM Cortex-M3 was tested automatically (full code coverage: all functions, marcos, code lines, conditions, etc.). Tests were performed on STM32L162.

DioneOS for ARM Cortex-M3

2013-03-29

DioneOS version for ARM Cortex-M3 processor was released.

Introduction to Multithreading

2011-07-11

'Introduction to Multithreaded Programming' has been added in tutorials section

State Machine support.

2011-06-15

State machine support has been added to the system. Pattern for state machine coding is defined.

Texas Instruments Developer Network

2011-04-11

ELESOFTROM entered Texas Instruments MCU Developer Network. This program gathers companies that develop software for TI MCUs and provide professional services in this domain.

Regular MSP430 supported.

2011-04-05

Support for regular MSP430 microcontroller and small code model has been added.

DioneOS release for MSP430x

2011-02-02

First release of the DioneOS System. Support for MSP430x and large code model.

Evaluation of the System Performance

In order to evaluate performance of the system critical operations were checked:
1. context switching between two threads,
2. extra load was measured that is introduced by epilog and prolog of critical section, as well as system tick interrupt.

The test consisted of two threads and semaphore, mutex, ISR working in various configurations. Generally, higher priority thread was waiting on some synchronization object while the other thread or ISR was releasing the object. Delay between release operation and continuation of execution in the thread that was waiting was measured. Execution of testpoints in the code was signalled on output processor pins and recorded by logic analyser.

IdDescription
MSP430x
 ARM Cortex-M3
fosc=25MHz fosc=32MHz
1from os_sema_post_intr()
to os_sema_wait()		 10.4us 9.26us
2from os_sema_post()
to os_sema_wait()		 11.9us 7.9us
3OS_DINT_SAVE
OS_INT_RESTORE		 -- 1.16us
4os_schedule() -- 3.2us
5from os_mutex_release()
to os_mutex_get()		 11.9us 7.86us
6Extra load by SysTick ISR (no timers) 4.1us1.78us
7Extra load by SysTick ISR (1 timer is armed) 4.6us 3.28us

Measurements were performed on the version optimized for speed:
1. MSP430F5438, silicon_version=msp430x, large_code_model, opt_level=3.
2. STM32L162, optimization -O2
Extra functionalities that supports debugging were disabled (e.g. semaphore overflow check, lock detection, scheduler statistics etc.)