1. Shared Memory IP Simulation Ben Davis

2. Outline Description Target Hardware Simulation Model TCP/IP uIP lwIP Results

3. Project Descritpion OS Independent TCP/IP Implementation Project requirments defined by employer, Applied Reasearch Laboratories Hardware is still in development phase Start of software development early o Simulate a shared memory interface to a TCP/IP stack o Run simulation on linux, with minimal OS dependencies o Utilize uIP or lwIP tcp/ip stack

4. Hardware, microcontroller Atmel SAM3U4E ARM Coretex M3 revision 2, up to 96MHz Memory protection Unit Thumb-2 Instruction Set Embedded Flash (64-256Kbytes) Embedded SRAM (16-48Kbytes)

5. Hardware, MAC Altera FPGA, Cyclone II Triple Speed Ethernet Megacore Function 10/100/1000-Mbps media access controller (MAC) Flexible IP options - MAC only, MAC+.....

6. Hardware

7. Software Emulation MicroController Primary focus is the running of TCP/IP, this can be run in a linux environment with minimal OS oriented function calls Network driver accessing OS shared memory instead of static shared memory MAC Secondary Application running in linux access same shared memory space as uIP Utilize tunneling driver (/dev/net/tun) to create virtual point- to-point network Actual application will have a translator in the FPGA to convert the shared memory access to avalon interface.

8. Shared Memory MAC Control Block 12 bytes Transmit Control Block 32 bytes Receive Control Block 32 bytes Receive Buffer UIP_BUF_SIZE bytes Transmit Buffer UIP_BUF_SIZE bytes Misc Other Shared Mem 0xA0000000 0x60000000 0x9FFFFFFF 0x60000000 0x60FFFFFF 0xFFFFFFFF 0x5FFFFFFF 0x00000000 Chip Select 0 Misc memory External SRAM Misc memory 0x61000000 SAM3U4E Memory Map

9. TCP/IP Model FTP, SSH, TELNET,... TCP,UDP,... IP(v4, v6), ICMP,... Tunnels, PPP, MAC,...

10. uIP "The open-source uIP TCP/IP stack provides TCP/IP connectivity to tiny embedded 8-bit microcontrollers, with maintained interoperability and RFC standards compliance." http://www.sics.se/~adam/uip/index.php/Main_Page Adam Dunkels Very small code size Very low RAM usage, configuarble at compile time Numerous ports available

11. uIP, Porting Network device init() request shared memory read() read from shared memory write() write to shared memory Timer clock_init() clock_time() gettimeofday() uipopt.h 32 bit addition, crc32

12. lwIP More Advanced Fully Functional o thread support o semaphore and mailbox allocation Core Functionality o single threaded model o preferred No-OS option

13. lwIP, Porting Only Core Functionality Network device init() request shared memory low level input() read from shared memory low level output() write to shared memory Polling or asynchrounous

14. TCP/IP Application httpd webserver Bidirectional test application access through mozilla, navigate web interface wget for course output performance

15. SAM3U4E Beyond Simluation: Toolchain for SAM3U4E Codesourcery g++ lite eabi armv7 thumb2 library Porting initialize system resources new timer calls

16. Results/Tradeoffs uIP vs lwIP o space - uIP o throughput- lwIP Could utilize a minimalist OS like eCOS, which inlcludes lwIP, or freeRTOS. Validity of simulation.

17. Conlcusion Questions?