AT91SAM7X256 Board and FreeRTOS Overview Real-Time Systems Lab Dae Don Jeon

내 용  AT91SAM7X256 Board Overview  FreeRTOS Overview  Gateway Middleware Network Initializing and Update

System Boundary

Hardware Block Diagram(AT91SAM7X256) USBEthernet UART

FreeRTOS Overview  Main Features  Choice of RTOS scheduling policy  Pre-emptive : Always runs the highest available task. Tasks of identical priority share CPU time (fully pre-emptive with round robin time slicing).  Cooperative : Context switches only occur if a task blocks, or explicitly calls taskYIELD().  Co-routines (light weight tasks that utilize very little RAM).  Message queues  Semaphores [ via macros ]  Trace visualization ability (requires more RAM)  Majority of source code common to all supported development tools  Wide range of ports and examples

FreeRTOS Overview (cont’)  Basic directory structure  Demo : Contains the demo application.  Source : Contains the real time kernel source code. ※ The Majority of the real time kernel code in three files that are common to every processor architecture.(tasks.c, queue.c list.c) (croutine.c if co-routines are used)  Demo  Common : The demo application files that are used by all the ports.  Dir x : The demo application build files for port x  Dir y : The demo application build files for port y  Source  Portable : Processor specific code.

FreeRTOS Overview (cont’)  Demo Application Test  FreeRTOS/Demo/lwIP_Demo_Rowley_ARM7/

Gateway Middleware Network Initializing

… Start Standalone Network Starting #Gateway node-1 [ ] ’ s Sync list tables 1

Gateway Middleware Network Initializing … Network Joining #Gateway node-2 [ ] ’ s Sync list tables … Join to [ ] ’ s Sync list tables Join Request 12

Gateway Middleware Network Initializing … Network Joining #Gateway node-2 [ ] ’ s Sync list tables … Join Accept [ ] ’ s Sync list tables 12

Gateway Middleware Network Initializing … Sync Request [ ] ’ s Sync list tables … [ ] ’ s Sync list tables Join Response : Sync list tables 12

Gateway Middleware Network Initializing … Sync Request [ ] ’ s Sync list tables … Sync Request to All Gateway node in Sync list table. (Except Parent and Local address) In this case, no target to sync. [ ] ’ s Sync list tables 12

Gateway Middleware Network Initializing … Network Joining #Gateway node-3 [ ] ’ s Sync list tables … [ ] ’ s Sync list tables … [ ] ’ s Sync list tables 3 2 OR 1 Join Request Join to

Gateway Middleware Network Initializing … Network Joining #Gateway node-3 [ ] ’ s Sync list tables … [ ] ’ s Sync list tables … [ ] ’ s Sync list tables 3 Join Accept

Gateway Middleware Network Initializing … Network Joining #Gateway node-3 [ ] ’ s Sync list tables … [ ] ’ s Sync list tables … [ ] ’ s Sync list tables 3 Join Response : Sync list tables

Gateway Middleware Network Initializing … Network Joining #Gateway node-3 [ ] ’ s Sync list tables … [ ] ’ s Sync list tables … [ ] ’ s Sync list tables 3 Sync Request to All Gateway node in Sync list table. (Except Parent and Local address) In this case, Except parent Gateway( ), local( ) Sync target is

Gateway Middleware Network Initializing … Network Joining #Gateway node-3 [ ] ’ s Sync list tables … [ ] ’ s Sync list tables … [ ] ’ s Sync list tables 3 Update Request : Sync list tables

Gateway Middleware Network Initializing … Network Joining #Gateway node-3 [ ] ’ s Sync list tables … [ ] ’ s Sync list tables … [ ] ’ s Sync list tables 3 Initializing Complete.

Further works  FreeRTOS Ethernet and UART application Test.  ZigBee Coordinator Node Application Test.