Cogent Computer Systems Inc. is offering a board support package (BSP) for running the RTEMS open source real-time operating system on its CSB337, a single board computer (SBC) based on the Atmel AT91RM9200 ARM920T system-on-chip (SOC). The BSP supports version 4.6 of the RTEMS OS and is available in full source form with one year of support for $5,995.

RTEMS, a real-time kernel, provides a high performance environment for embedded applications development, according to Cogent.

Overall features of the BSP listed by Cogent include:

• Standards Compliant, POSIX 1003.1b API including threads and RTEID/ORKID based Classic API (similar to pSOS+)
• High performance port of FreeBSD TCP/IP stack
• Debugging via GNU debugger (gdb) and DDD GUI interface to GDB that is thread aware, debug over Ethernet or Serial Port
• Filesystem Support, In-Memory Filesystem (IMFS), TFTP Client Filesystem, MS-DOS FAT32, FAT16, and FAT12 and NFS client

Kernel features of RTEMS listed by Cogent include:

• multitasking capabilities
• event-driven, priority-based, preemptive scheduling
• optional rate monotonic scheduling
• intertask communication and synchronization
• priority inheritance
• responsive interrupt management
• dynamic memory allocation
• high level of user configurability

RTEMS is complimented by the highly regarded FreeBSD TCP/IP stack, says Cogent, which supports the well-known sockets interface.

Cogent lists the following supported FreeBSD stack protocols:

• UDP, TCP, ICMP, DHCP, RARP, BOOTP, PPPD
• Client Services include:
  • Domain Name Service (DNS) client
  • Trivial FTP (TFTP) client
  • Network Filesystem System (NFS) client
• Servers include:
  • FTP server (FTPD)
  • Web Server (HTTPD)
  • Telnet Server (TELNETD)
  • Sun Remote Procedure Call (RPC)
  • Sun eXternal Data Representation (XDR)
  • CORBA

The CSB337 RTEMS ports support the serial console I/O, the real-time clock, OS and general purpose timers and Ethernet I/O, according to Cogent. Future releases will provide support for: CAN I/O (low level library only); LCD Controller (low level graphics library); and MS-DOS filesystem via compact flash and SD/MMC card socket.

Cogent CSB337 AT91RM9200-based SBC
Click for larger view

Cogent lists the following features for its CSB337 :

• 180Mhz ARM920T, 16K I-Cache, 16K D-Cache
• 32Mbyte 32-Bit Wide SDRAM
• 8Mbyte 16-Bit Wide StrataFLASH
• Secure Digital Card via 4-Bit SDIO Controller
• Epson S1D13706 with 80KByte SRAM supports up to 320×240 TFT, HR-TFT and STN LCD Displays
• One USB V1.1 Device Port
• Two USB V1.1 Host ports available via GPIO Expansion Connector
• Dual RS232 Serial – Two additional UARTS (TTL only) available via the GPIO Expansion Connector
• Infineon SAK82C900 Dual CAN Controller via SPI
• On-Chip 10/100 Mbit Controller with DMA
• Dallas DS1307 RTC With Battery
• Full CPU Bus and GPIO available via 40-Pin stackable headers
• AC'97 Interface via GPIO Expansion Connector (Compatible with the AC'97 Codec on the CSB301 Breakout Board)
• Compact Flash Interface via GPIO, Address and Data Bus Expansion Connectors (Compatible with CSB301)
• 20-Pin Header and 38-Pin, High-Speed, Embedded Trace Module Connector (16-Bit)
• Three GPIO for LED Control via Expansion Header
• Three GPIO for User Switches from Expansion Header
• 5V Only Connection

A Breakout Board, such as the CSB300, or CSB301 allows for standalone operation. Using the CSB301 also allows use of the AC'97 and Compact Flash Interfaces. Additionally, the CSB301 contains a 5.7″ Color LCD with Touch Screen and Dual RS485 for the AT91RM9200 additional UARTS. CSB301 is sold seperately.

Cogent CSB337, top view

Cogent CSB337, bottom view

 
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