Agenda. Gums6x Tobi. Gums6x Overo AirSTORM. Wifi setup in Gums6x. wi2wi wireless chip 9/28/12. ELE 437 Wireless Communica4on on Gums4x Embedded System

Transcription

1 9/28/12 Agenda The University of Rhode Island ELE 437 Wireless Communica4on on Gums4x Embedded System Introduc6on of Gums6x Wireless communica6on in Gums6x Wifi network setup Bluetooth in Gums6x PAN network of bluetooth Serial connec6on via bluetooth Bluetooth programming Daxian Yun RFCOMM socket programming L2CAP socket programming 旦大学 Gums6x Overo AirSTORM Architecture: ARM Cortex- A8 Processor: Texas Instruments Sitara AM3703 processor - ARM Cortex - A8 Core Processor Speed: Built to operate at 1 GHz (recommends 800MHz) RAM: 512 MB Bluetooth: Bluetooth 3.0 WIFI: b/g MicroSD card slot: 8G Gums6x Tobi Features: 10/100 Ethernet DVI- D (HDMI) USB Host USB OTG USB Console Baaery connector Stereo Audio In /Out jack wi2wi wireless chip Wifi setup in Gums6x Applica6ons - Warehousing and logis6cs Create bootable MicroSD Wifi setup Login Overo via SSH handhelds - Automo6ve acermarket - Medical equipment - Industrial handhelds - M2M applica6ons - POS terminals - Internet- enabled consumer devices - VoFi and other smartphones - WiFi enabled security cameras 1

2 Create a bootable MircoSD Card Result 1 1. Use microsd to SD card adapter or USB card reader, insert microsd card to your development machine (Linux) 2. In Linux terminal, discover your microsd card (/dev/sdb or /dev/mmcblk0p1), unmount it. sudo umount /dev/sdb1 3. Display mircosd size info, record it for further opera6on sudo fdisk l /dev/sdb 4. Par66on the card into one FAT par6on for boot and the other Linux ext3 par6on for file system sudo sfdisk - - force - D - us - H 84 - S 38 - C 4737 /dev/sdb /dev/sdb1 :128,130944,0x0C,* /dev/sdb1 * c W95 FAT32 (LBA) /dev/sdb2 :131072, /dev/sdb Linux Result 2 Cont. 5. Format and mount each par66on sudo mkfs.vfat - F 32 /dev/sdb1 - n boot sudo mke2fs - j - L rooks /dev/sdb2 sudo mkdir /media/{boot,rooks} sudo mount - t vfat /dev/sdb1 /media/boot sudo mount - t ext3 /dev/sdb2 /media/rooks 1) Download boot files (uimage, u- boot.bin, MLO and omap3- desktop- image- overo.tar.bz2) from hap://cumulus.gums6x.org/images/angstrom/developer/ 2) copy binary files to /media/boot 1. sudo cp home/zxiaorong/overo- oe/boot_files/mlo /media/boot/mlo 2. sudo cp home/zxiaorong/overo- oe/boot_files/u- boot.bin /media/boot/u- boot.bin 3. sudo cp home/zxiaorong/overo- oe/boot_files/uimage /media/boot/uimage 3) expand the root file system archive on to /media/rooks sudo tar xaf home/zxiaorong/overo- oe/boot_files/omap3- desktop- image- overo.tar.bz2 - C /media/rooks 4) unmount /media/boot and /media/rooks sudo umount /dev/sdb1 sudo umount /dev/sdb2 Connect Guns6x by USB Cable Connect gums6x by USB cable (without power on) ls /dev/ayusb0 (or ayusb1) Connect gums6x via kermit Create and edit.mykermrc in home directory. Content of.mykermrc: set line /dev/ayusb0 set flow- control none set carrier- watch off set speed connect Type kermit in terminal, then power on gums6x. Wait un6l the ini6al boot up finished danny@gums6x- vm: ~ $sudo kermit Type user name root overo login: root root@overo:~# Wifi network setup Assume we have a wireless router ID: k120 Passward: k120ele437 Encryp6on:wpa2- psk In Overo terminal: wpa_passphrase k120 k120ele437> wpa_lab.conf Use nano command to edit wpa_lab.conf as: ctrl_interface=/var/run/wpa_supplicant ctrl_interface_group=0 eapol_version=1 ap_scan=1 fast_reauth=1 network={ ssid= gums6xlab" proto=wpa2 key_mgmt=wpa- PSK pairwise=ccmp TKIP group=ccmp TKIP scan_ssid=1 #psk= " psk=14633z4c756b4c39c23fd9b7b810098bacca d0b1a44c7d50f3d12f priority=10 } Move wpa_lab.conf to /etc/wpa_lab.conf 2

3 Wifi network setup (2) Login Overo via SSH Edit /etc/network/interfaces as: allow- hotplug wlan0 auto wlan0 iface wlan0 inet dhcp wireless_mode managed wireless_essid k120 pre- up wpa_supplicant - B - Dwext - iwlan0 - c/etc/wpa_lab.conf post- down killall - q wpa_supplicant Remove networkmanager: opkg list_installed grep networkmanager If exist, then : opkg remove networkmanager Connect an antenna to J2 on Overo Air, reboot Overo Air Now the wifi should be work, check the ip address by ifconfig ifconfig a In your linux terminal, use SSH login to Overa Air(assume the ip address is ) ssh root@ The authen6city of host ' ( )' can't be established. RSA key fingerprint is c5:8a:b6:b9:0e:ab:f0:f6:53:19:11:d7:65:70:cd:9b. Are you sure you want to con6nue connec6ng (yes/no)? yes Warning: Permanently added ' ' (RSA) to the list of known hosts. Last login: Fri Sep 7 05:44: root@overo:~# Bluetooth in Gums6x Introduc6on to Bluetooth Introduc6on to Bluetooth Bluez- u6ls and bluetooth development tool PAN network setup Serial connec6on setup Bluetooth programming Bluetooth network topology; piconet and scaaernet. The first level Bluetooth network is called piconet. All the devices in a piconet share same channel. A maximum of 255 devices can be linked together in a piconet, but only 8 devices can stay ac6ve at a same 6me. Out of eight devices, there is one master device and other seven are slave. All the ac6ve devices in a piconet can be iden6fied by 3- bit ac6ve device address. Bluez and Bluez development tool hciconfig hcitool sdptool hcidump l2ping rfcomm Opkg install bluez-utils hciconfig hciconfig hcix [up Open and ini6alize HCI device down Close HCI device reset Reset HCI device rstat] Reset stat conters auth Enable Authen6ca6on noauth Disable Authen6ca6on encrypt Enable Encryp6on noencrypt Disable Encryp6on piscan Set page scan and inquiry scan mode noscan Disable scan modes iscan Set inquiry scan mode only pscan Set page scan mode only inq [length] Inquiry of devices ptype [type] Set packet type lm [mode] Get/Set default link mode lp [policy] Get/Set default link policy conn Show ac6ve connec6ons features Show features name [name] Get/Set local name class [class] Get/Set class of device version Display version informa6on 3

4 hcitool sdptool & l2ping rfcomm pand pan network setup Assume we have two Gums6x, one is bluetooth server and the other is bluetooth client Set server: Check bluetooth pand connec6on Server: Client: Set client: 4

5 Bluetooth serial connec6on via RFCOMM Set both bluetooth devices to scan enable mode hciconfig hcix piscan Bind the device and check for the connec6on: $rfcomm bind 0 00:80:37:2E:32:39 1 $rfcomm show 00:80:37:2E:32:39 rfcomm0: 00:80:37:2E:32:39 channel 1 clean If conneciton works fine. Use Kermit to connec6on two devices: kermit - l /dev/rfcomm0 configure Kermit with set carrier- watch off set speed set file type bin set reliable fast set flow- control none set rec pack 4096 set send pack 4096 set window 5 set prefixing all Cont. Bluetooth programming bluez- libs tar.gz cross compile Bluetooth RFCOMM programming Compile rfcomm_server.c tar xvfz bluez- libs tar.gz cd bluez- libs /configure make && make install In home directory of Ubuntu, there s a tar file rfcomm.tar, copy it to your gums6x use scp rfcomm.tar root@ :/home/root tar xvf rfcomm.tar Check file rfcomm_server.c and rfcomm_client.c and bluetooth.h rfcomm.h Change the bluetooth address of server and client to your gums6x bluetooth address cd rfcomm gcc o rfcomm_server rfcomm_server.c lbluetooth./rfcomm_server Compile rfcomm_client.c cd rfcomm gcc o rfcomm_client rfcomm_client.c lbluetooth./rfcomm_client Reference [1] hap:// a- bootable- microsd- card.html [2] hap:// to- my- gums6x- system.html [3] hap://wiki.gums6x.org/index.php?6tle=overo_wifi 5