TOPPERS/JSP kernel

The TOPPERS/JSP kernel is a real-time kernel that is in conformity with the µITRON4.0 specification. It is also the first development result by the TOPPERS Project. JSP is an acronym for Just Standard Profile, and as the name shows, is implemented in accordance with the µITRON4.0 specification standard profile regulation. The latest JSP release can be downloaded from here.

Main features are as follows:

• Easy to read and reconstructible source code
  Keeping in mind that utilization would be for research and development, emphasis was put on easy to read and reconstructible source codes. The algorithm, although easy to read, is not inefficient. For example, by using heap structure to manage time events, a complex but efficient algorithms are employed.
• Porting to other targets is easy to do
  C language is used for most parts of the kernel. Clear separation of target independent parts and target dependent parts are made, therefore making porting to other target processors and systems is made easy. There have been reports where, if the target processor architecture is familiar, that porting was accomplished in three days.
• High efficiency performance and low RAM usage
  For a kernel where most parts are written in C, high efficiency performance and low RAM usage is realized
  
• Simulation environment on Linux and Windows
  Simulation environments for JSP kernel to run on Linux and Windows are available. These simulation environments switch multiple tasks within one process in Linux/Windows. It is the best suited for proto-type development of embedded systems, logic level verifications, and real-time learning experiences.
• It is possible to construct systems solely using free software
  GCC and GNU develop environment are standard software develop environments. Therefore the user can acquire not only the kernel itself, but also the develop environment free and develop a system.

Target system

The JSP kernel supports the following target processor/target system at this time.

Directory		Develop environment
	Processor (product no.)	System (manufacturer)
m68k		GNU develop environment
	M68040（MC68LC040）	DVE-68K/40 (DENSAN CO., LTD.)
sh3		GNU develop environment
	SH3（SH7709A）	MS7709ASE01 (Hitachi ULSI Systems Co.,Ltd.)
	SH3（SH7729R）	MS7729RSE01 (Hitachi ULSI Systems Co.,Ltd.)
	SH3（SH7727）	MS7727CP01 (Hitachi ULSI Systems Co.,Ltd.)
	SH4（SH7750）	MS7750SE01 (Hitachi ULSI Systems Co.,Ltd.)
sh3-ghs		GHS develop environment
	SH3（SH7709A）	MS7709ASE01 (Hitachi ULSI Systems Co.,Ltd.)
	SH3（SH7727）	MS7727CP01 (Hitachi ULSI Systems Co.,Ltd.)
sh1		GNU develop environment
	SH1（SH7032）	KZ-SH1-01(Kyoto Microcomputer Co.,Ltd.)  T RISC assessment kit SH-1(CQ Publishing Co.,ltd.)
	SH1（SH7034）	µITRON onboard SH1CPU board (CHUO ELECTRIC WORKS Co.,LTD.)
sh2		GNU develop environment
	SH2（SH7145）	AP_SH2F_6A (Alpha Project)
	SH2(SH7615)	HSB7615IT (Hokuto Denshi co,. ltd.)
h8		GNU develop environment
	H8（H8/3048F）	AKI-H8/3048F(Akizuki Denshi Tsusho Co., Ltd.)
	H8（H8/3052F）	AKI-H8/3052F(Akizuki Denshi Tsusho Co., Ltd.)
	H8（H8/3067F）	AKI-H8/3067F(Akizuki Denshi Tsusho Co., Ltd.)
	H8（H8/3068F）	AKI-H8/3068F(Akizuki Denshi Tsusho Co., Ltd.)
	H8（H8/3069F）	AKI-H8/3069F(Akizuki Denshi Tsusho Co., Ltd.)
h8s		GNU develop environment
	H8S（2350）	H8S/2350 assessment board (MISPO Inc)
armv4		GNU develop environment
	ARM9 （ARM922T）	KZ-ARM9EXPCI-01(Kyoto Microcomputer Co.,Ltd.)
armv4-ghs		GHSdevelop environment
	ARM9 （ARM920T）	Integrator/AP+CM920T（ARM）
	ARM9E（ARM966E-S）	Integrator/AP+CM966E-S（ARM）
m32r		GNU develop environment
	M32R（M32102S6FP）	M3A-2131G50(Mitsubishi Electric Corporation)
microblaze		GNU develop environment
	MicroBlaze	MIREF（YDK）
	MicroBlaze	MIRE_MULTI3000（YDK）
	MicroBlaze	MultiMedia Board（Xilinx）
tms320c54x		Texas Instruments develop environment
	TMS320C54x（TSM320C5402）	TMS320VC5402 DSK（Texas Instruments）
xstormy16		GNU develop environment
	xstormy16	SANYO Micricontrollers develop tool (SANYO Electric Co., Ltd.)
mips3		GNU develop environment
	MIPS3（VR4131）	KZ-Vr4131PCI-01(Kyoto Microcomputer Co.,Ltd.)
	MIPS3（VR5500）	RTE-VR5500-CB(64) (Midas lab Inc.)
m16c-renesas		Renesas develop environment
	M16C（M30620FCAFP-CPU）	OASKS16 (OAKS ELECTRONICS CO., LTD )
	M16C（M30262F8FG-CPU）	OAKS16-MINI (OAKS ELECTRONICS CO., LTD )
s1c33		GNU develop environment
	SC33	DMT33209（EPSON）
	SC33	LUXUN2（EPSON）
powerpc32		GNU develop environment
	PowerPC32（MPC860T）	TB6102S (TANBAC Co.,Ltd.)
nios2		GNU develop environment
	Nios2	NiosII Development Board (ALTERA)

TOPPERS/JSP kernel release1.3 supports the following target processor/target system.

Simulation environment

As a JSP kernel simulation environment, a Linux based environment and a Windows based are available. These simulation environments are activated within a process of Linux/Windows by switching multiple tasks, and can be used as a thread library as well.

Also in the below processor, by applying program(s) provided by GNU and develop tool environment provided by manufacturers embedded microcomputer actions can be simulated on personal computers and can activate JSP kernel without having assessment boards ready. For simulation tool information, see the document attached to the JSP kernel release package.

Develop environment

GNU develop environment such as GCC is appointed as TOPPERS/JSP kernel’s standard software develop environment. GCC extension functions, such as inline function and inline assembler function, are utilized in some parts. However, for target processors not supported by the GNU develop environment, other type of compiler is utilized. For example, Visual C++ is used for Windows simulation environment.

GNU develop environment

Within the GNU develop environment BINUTILS, GCC_CORE and GDB is specifically needed. If a standard library is necessary for the application program, NEWLIB can be employed. Cygwin is needed if the develop environment is constructed on Windows. Source codes can be downloaded from the following links: GNU develop environment: GNU Project, Ring Server NEWLIB: Red Hat Cygwin: Red Hat, Ring Server BINUTILS, GCC_CORE, and GDB binary for Cygwin SH can be obtained from the below link. Open at /usr/local/ and make a path to /usr/local/sh/bin to use. Develop environment binary package (SH, Cygwin) When performing a remote debugging utilizing GDB (GNU debugger) by connecting the host machine and target system using a serial interface, a program called a stub is needed on the target system. The following are stub source programs which have been reconstructed so is can be used with the TOPPERS/JSP kernel. SH3 stub (approx.30KB) 68040 stub (approx.24KB)

Simple monitor for H8

Simple monitor for H8 is distributed below. The H8 flash ROM by Renesas Technology Corp. has limited rewrite capacity. Therefore, writing the debug module to the flash ROM and debugging is not an ideal method. The H8 simple monitor is a program which loads the debug module to RAM for execution. Write the H8 simple monitor to the flash ROM and load the debug module to the RAM of the H8 or a RAM setup externally for debugging. By this, the problem of limited times of rewriting to the flash ROM can be circumvented. The below is a summary of the H8 simple monitor. The target system is AKI-H8/3048F, 3052F, 3068F and 3069F by Akizuki Denshi Tsusho Co. The monitor is designed to conform with the TOPPERS/JSP kernel for H8, and it is possible to load a debug module embedded with the TOPPERS/JSP kernel for H8 to RAM and execute. A virtual interrupt vector can be set in the internal RAM of the H8. The H8/3048F is compatible with the monitor debugger by Akizuki Denshi Tsusho Co. There is a function to display/change the memory contents. Simple monitor for H8 (72KB)

Other target systems

Other simulation environments

Development staff

TOPPERS Project members who are development staff for the TOPPERS/JSP kernel are as follows (association is of when the member joined TOPPERS)

* Names of development staffs are listed with permission