MSP430, Rowley

embOS for Texas Instruments MSP430 was developed for and with Rowley compiler and supports all memory models offered by this compiler.
It comes with an easy to use start workspace and start project for Rowley's CrossStudio V1.2. Software development with simulator or MSP430 Flash Emulation Tool using Rowleys's built-in debugger is supported.

Resources and performance data

Memory usage
Kernel size (ROM)	1587 bytes
Kernel RAM usage	28 bytes
RAM usage per task control block	18 bytes
RAM usage per resource semaphore	4 bytes
RAM usage per counting semaphore	2 bytes
RAM usage per mailbox	12 bytes
RAM usage per software timer	10 bytes
RAM usage event	0 bytes
Min. stack-size per task (RAM)	56 bytes
Timing
Context switch time	313 clock cycles (78.2 µs), independent of number of tasks
Interrupt latency time	max. 154 clock cycles (38.5 µs)
Kernel CPU usage/TICK	less than 1% of total calculation time at 1000 Interrupts/second (1ms TICK)
Basic time unit (TICK)	typ. 1 ms, min. 100 µs (10 kHz interrupt frequency)
Features
Max. no. of tasks	Unlimited (by available RAM only)
Max. no. of mailboxes	unlimited (by available RAM only)
Max. no. of semaphores (resource/binary/counting)	unlimited (by available RAM only)
Max. no. of software timers	unlimited (by available RAM only)
Max. no. of priorities	255
Stack size idle task (RAM)	0(no memory needed)
Nested interrupts	permitted
Task switches from within ISR	possible

Absolute data given above were measured with embOS release build on an MSP430F149 CPU running at 4.8MHz.

embOSView offers system analysis during runtime

Available Emulators

• Texas Instruments

Additional information

Rowley Web site for additional compiler info / support

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Release notes

1. Tool chain used for build
2. Performance
3. New features
4. Improvements
5. Program corrections
6. Known problems
7. Release history
8. Miscellaneous

Tool chain used for build

The following tools have been used:

Compiler:  Rowley  HCC           V1.2 Release build on Jan 15 2004 at 16:15:00
Assembler: Rowley  HAS           V1.2 Release build on Jan 15 2004 at 16:15:00
Librarian: Rowley  HAR           V1.2 Release build on Jan 15 2004 at 16:12:36
Workbench: Rowley  CrossStudio   V1.2

Performance

1. Task switch time
   Release library : 78.2 us = 313 cycles
2. Interrupt latency
   Release library: 38.5 us = 154 cycles

Absolute timings are based on an MSP430F149 running at approx. 4.8 MHz and release build library

New features

Version 3.20

1. OS_Suspend() / OS_Resume() implemented
   New functions to suspend and resume tasks unconditionally.
2. Fixed size memory blocks implemeted
   New functions to allocate fixed size memory blocks from embOS.
3. Dynamic memory allocation supported by embOS
   Thread safe dynamic memory allocation functions implemented.
   Not delivered with standard libraries. Can be activated when compiling sources only.

Improvements

None

Program corrections

None

Known problems

None

Release history

Version	Release date	Short explanation
V3.20f	30. Apr 2003	Initial release for MSP430 using "Rowley CrossStudio 1.2 for MSP 430"

Miscellaneous

This document was first released with version 3.20f of the software.
Software released earlier is documented internally. This information is available at request.