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AndroidGreece.gr - View topic - Wireless driver issues
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 Wireless driver issues 
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Joined: 08 Sep 2009, 17:06
Posts: 2
Post Wireless driver issues
Kalispera,
exw ena HTC Dev-1 kai 8elw na kanw ena early-stage demo gia ena self-tuning protocolo gia to physical layer tou 802.11g.
Pio sygkekrimena, endiaferomai na pairnw apo to WIreless Interface tou Dev-1 statistics gia to signal kai noise level otan eimai syndedemenos se kapoio AP.
Wstoso den kserw an mporw na xrhsimopoiw ta methods tou class WiFiInfo apo to package android.net.wifi me granularity xronou poly mikro (dhladh e.g. na kalw thn getRssi() me periodo mikroterh tou 0.2s).

Af enos den kserw ka8e pote kai pws enhmerwnontai oi times pou epistrefoun ta methods tou class WifiInfo (einai as poume on a per-packet basis??) kai afeterou den kserw an to Dev-1 san syskeyh kai leitourgiko mporei na shkwsei toso vary measurement process.

Me mia prwth grhgorh matia katw apo to Android framework gia to sygkekrimeno thlefwno (Dev-1 / G1), h Texas Instruments parexei to source code gia ton driver tou WLAN transceiver (TI WLAN 1251 PG 1.2) kai vrisketai katw apo to ekshs directory sto source code tou Android: $(ANDROID_SRC_BASE_DIR)/system/wlan/ti/sta_dk_4_0_4_32
To erwthma einai an mporei kaneis na xrhsimopoihsei krymmena functionalities opws p.x. to Ad-Hoc mode pou oi drivers deixnoun na yposthrizoun alla to Android framework den kanei expose sto Application framework.
Ayth h diadikasia (exposing functionalities from the kernel-level) deixnei na einai arketa epiponh mias kai prepei na ylopoihsei kaneis wrapper libraries kai na tis kanei integrate sto ANdroid runtime.

Anakefalaiwnontas loipon ta erwthmata, exoume:
a) An kserei kaneis pws enhmerwnontai oi times gia noise kai rssi pou pairnoume apo ta methods tou class class WiFiInfo
b) An exei kataferei kapoios na vrei mia lysh sto ad-hoc connectivity, estw kai xrhsimopoiwntas to NDK instead tou SDK.

Exaristw,
Dimos


08 Sep 2009, 17:36
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Joined: 24 May 2008, 23:50
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Post Re: Wireless driver issues
Για την ανανέωση προφανώς υπάρχει χρονικός περιορισμός μέσα απο το API υποθέτω για την ομαλή λειτουργία της συσκευής. Ακόμα και έτσι, δειγματοληψία της τάξης των 0.2 δευτερολέπτων μου φαίνεται αρκετά ικανοποιητική.

To Ad hoc connectivity ενώ υποστηρίζεται απο τον linux kernel και τον driver της ασύρματης κάρτας, δεν παρέχεται προς το παρών μέσα απο το API. Εαν κάνεις root το τηλέφωνο, υπάρχουν άτομα που έχουν γράψει ήδη τους wrappers, αλλά δεν γνωρίζω τι ακριβώς κάνουν.

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09 Sep 2009, 14:39
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