LE920/LE910 - Wi-Fi interface Application Note

LE920/LE910 - Wi-Fi interface

Application Note80463NT11345A r3 2015-05-21

80463NT11345A_LE920/LE910 - Wi-Fi interface Application Note

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Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 2 of 21

LE920 series

LE910-NAG/EUG


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................................................................................................................... 2

1. Introduction .................................................................................................................................. 6

...................................................................................................................................... 6

................................................................................................................................ 6

............................................................................................ 6

............................................................................................................. 7

................................................................................................................ 7

2. The Wi-Fi Interface ...................................................................................................................... 8

........................................................................................................................... 8

........................................................................................................... 8

2.2.1. LE920 Wi-Fi interface ................................................................................................................. 8

2.2.2. LE910 Wi-Fi interface ................................................................................................................. 9

........................................................................................................... 9

..................................................................................... 10

..................................................................................... 13

3. Wi-Fi Demo getting started guide ............................................................................................. 16

................................................................................................ 16

.......................................................................................................... 16

............................................................................................................ 17

........................................................................... 19


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’

[email protected]

[email protected]

[email protected]

[email protected]

mailto:[email protected]




http://www.telit.com/en/products/technical-support-center/contact.php

http://www.telit.com/


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Revision Date Changes

r1 10th Sept 2014 Initial

r2 12th Feb 2015 Software updates

r3 21st May 2015 Add LE910 support


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The Wi-Fi Interface is one part of the Baseband System.

Its main application is to be connected with Qualcomm Atheros QCA6053 chipset.

The Wi-Fi Interface is basically a dedicated SD interface that is designed as a communication

channel to the Qualcomm Atheros chipset.

LE920 Wi-Fi interface contain the following signals:

Function LE920 function pin #

WLAN RESET WIFI_SDRST_TGPIO13 Y3

SDIO CMD WIFI_SDCMD_TGPIO14 AB3

SDIO DATA 0 WIFI_SD0_TGPIO15 AD3

SDIO DATA 1 WIFI_SD1_TGPIO16 AF3

SDIO DATA 2 WIFI_SD2_TGPIO17 AH3

SDIO DATA 3 WIFI_SD3_TGPIO18 AK3

SDIO CLOCK WIFI_SDCLK_TGPIO19 AM3


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LE910 Wi-Fi interface contain the following signals:

Function LE910 function pin #

WLAN RESET WIFI_SDRST TGPIO alternate function

SDIO CMD WIFI_SDCMD N13

SDIO DATA 0 WIFI_SD0 J13

SDIO DATA 1 WIFI_SD1 M13

SDIO DATA 2 WIFI_SD2 K13

SDIO DATA 3 WIFI_SD3 H13

SDIO CLOCK WIFI_SDCLK L13

The following diagram shows basic connection of LE920 Wi-Fi interface with Qualcomm

QCA6053 ref. design

Figure 1: Basic block diagram connection

LE920/LE910

ATHEROS

QCA6053 Ref. design

WI-Fi SDIO Int.

VBATT (3.3V – 4.2V)

VAUX (1.8V)


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Wi-Fi interface connection using LE920 IFBD and QCA6053 reference schematics, is done via

IFBD utility header connectors, references PL102 and PL104.

The following table shows detailed connection:

Function LE920 function LE920 IFBD Connection

WLAN RESET WIFI_SDRST_TGPIO13 PL104 / pin 10

SDIO CMD WIFI_SDCMD_TGPIO14 PL102 / pin 22

SDIO DATA 0 WIFI_SD0_TGPIO15 PL102 / pin 21




SDIO CLOCK WIFI_SDCLK_TGPIO19 PL102 / pin 24

VBATT Supply VBATT PL104 / pin 25

1.8V Supply VAUX PL104 / pin 16

GND GND PL102 / pins 15,16


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Figure 2: LE920 IFBD and QCA6053 IFBD connection example

Connected to LE920 Wi-Fi Demo Board

Utility header connectors

LE920 Wi-Fi Demo board mounted on

xE920 IFBD


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Figure 3: Telit LE920 Wi-Fi Demo board – Top & Bottom View

Figure 4: QC SD48 Top & Bottom view


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Wi-Fi interface connection using LE910 IFBD and QCA6053 reference schematics, is done via

IFBD utility header connectors, references PL102 and PL104.

The following table shows detailed connection:

Function LE910 function LE910 IFBD Connection

WLAN RESET WIFI_SDRST PL102 / pin 6

(example for GPIO_05 set as

alternate function)

SDIO CMD WIFI_SDCMD PL204 / pin 8

SDIO DATA 0 WIFI_SD0 PL204 / pin 3




SDIO CLOCK WIFI_SDCLK PL204 / pin 7

VBATT Supply VBATT PL101 / pin 9

1.8V Supply VAUX PL102 / pin 1

GND GND PL102 / pin 10

PL204 / pin 10

PL101 / pin 10


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Figure 5: LE910 IFBD and QCA6053 IFBD connection example

Connected to LE910 Wi-Fi Demo Board

Utility header connectors


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Figure 6: Telit LE910 Wi-Fi Demo board – Top & Bottom View


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The following Drivers must be installed:

- Android SDK platform on a Windows machine:

a) Go to http://developer.android.com/sdk/index.html.

Follow the instructions for installing the SDK (Select SDK only, no need for ADT

bundles).

b) Right-click My Computer, select Properties→Advanced→Environment Variables, and set

the path to include the c:\android-sdk-windows\tools directory.

The path must point to directory with fastboot.exe file in it.

For example -> C:\Program Files\Android\android-sdk\platform-tools

c) Navigate to the %USERPROFILE%\.android directory (simply copy this line into the file

browser: %USERPROFILE%\.android).

d) In the %USERPROFILE%\.android directory, create/edit the adb_usb.ini file. If the file

already exists, it will contain a DO NOT EDIT message. Disregard this message and edit

the file anyway. To edit, add a line containing 0x1bc7 to the end of the file. The file

contents should look like this:

# ANDROID 3RD PARTY USB VENDOR ID LIST -- DO NOT EDIT.

# USE 'android update adb' TO GENERATE.

# 1 USB VENDOR ID PER LINE: 0x1bc7

- USB drivers on a Windows machine:

1) Open Command prompt (cmd.exe), and execute ‘adb shell’ command.

Line marking will changed to / # -> you can proceed to step 2.

The following steps (2-4) are run from within this shell, as is.

2) echo 1 > /sys/devices/platform/msm_sdcc.2/polling

3) modprobe ar6000 targetconf="router" devmode=ap

4) hostapd -B /etc/hostapd.conf

5) There might be a need to start a data call on the Linux side, which is done by issuing the

following command: network_connect_client start


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a. WLAN support access point mode. To activate it you should:

1. Change wlan mode to access point.

AT#WLANMODE=0

2. Start wlan.

AT#WLANSTART=1

b. WLAN support client mode. To activate it you should:

1. Change WLAN mode to client.

AT#WLANMODE=1

2. Start WLAN.

AT#WLANSTART=1

c. Switch to access point/ client

After activating WLAN you can switch mode from AP to client and from client to AP

using #WLANMODE

1. Change WLAN mode to client.

AT#WLANMODE=1

2. Change wlan mode to access point.

AT#WLANMODE=0

d. Change broadcast mode

After activating/ defining WLAN as AP (see a,c2) you can makes the SSID visible and

broadcast using #WLANBROADCAST.

1. Change SSID to be visible.

AT#WLANBROADCAST=0

2. Change SSID to be invisible.

AT#WLANBROADCAST=1

e. Change/set the network name

After activating/ defining WLAN as AP (see a,c2) you can change/ set the name of the

network using:

AT#WLANSSID="network name"

f. Change/set the network security


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After activating/ defining WLAN as AP (see a,c2) you can change/ set the network

security using #WLANSECURITY.

1. Disable network security

AT#WLANSECURITY=0

2. Enable and define network security

AT#WLANSECURITY= wpa, key_mgmt, pairwise, key

wpa - security type

1 – wpa1

2 – wpa2

3 – wpa1 + wpa2

key_mgmt - This controls what key management algorithms a client can

authenticate with.

0 - WPA-PSK

1 - WPA-EAP

2 - WPA-PSK and WPA-EAP

pairwise - This controls wpa's data encryption

0 – TKIP

1 – CCMP

2 - TKIP and CCMP

key - the network's password (8…63 characters)

Example: define the security to be wpa1, key management algorithms to be WPA-EAP, data

encryption: TKIP, password: 0123456789.

AT#WLANSECURITY=1,0,0,"0123456789"

g. Change/set the AP channel number

After activating/ defining WLAN as AP (see a,c2) you can change/ set the channel

number using:

AT#WLANCHANNEL= number.

NOTE: The channel number should be defined according to the standard.

h. Change/ set the WIFI protocol

WLAN support WIFI protocols b,g,n.

After activating/ defining WLAN as AP (see a,c2) you can change/ set the wireless

protocol using #WLANPROTOCOL.

1. Set the wireless protocol to 802.11b

AT#WLANPROTOCOL=0

2. Set the wireless protocol to 802.11g

AT#WLANPROTOCOL=1


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3. Set the wireless protocol to 802.11n

AT#WLANPROTOCOL=2

i. Scan for wireless networks

After activating/ defining WLAN as client (see b,c1) you can scan for wireless networks

using #WLANSCAN.

1. Scan and display short output:

AT#WLANSCAN=0

2. Scan and display extend output:

AT#WLANSCAN=1

j. Connect to the network

After scanning for wireless networks (see i) you can connect to a specific SSID using

#WLANCONNECT.

1. Connect to network without security.

AT#WLANCONNECT = "SSID NAME"

2. Connect to secure network.

a. With ASCII key

AT#WLANCONNECT="SSID_NAME",1,"KEY"

b. With hexadecimal key

AT#WLANCONNECT="SSID_NAME",0,"KEY"

k. Disconnect from the network

After connecting to the network (see j) you can disconnect using:

AT#WLANDISCONNECT

l. Add/ change Hostapd configuration file

Hostapd configuration file controls many options with regards to AP mode only, in which

not all are supported by the current WIFI chip.

AT#WLANCONFIG= file size.

m. Display last error regarding to the activation of hostapd configuration file

interface

Interface name. Should be set to the WLAN interface.


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interface=eth0

ssid

Set the name of the network

ssid=LE9X0_AP

hw_mode

Define the WIFI protocol

Protocol Frequency Signal Maximum data rate

802.11b 2.4 GHz HR-DSSS 11 Mbps

802.11g 2.4 GHz OFDM 54 Mbps

802.11n 2.4 or 5 GHz OFDM 600 Mbps (theoretical)

Define as 802.11b

Hw_mode=b

ieee80211n=0

wmm_enabled=0

Define as 802.11g

Hw_mode=g

ieee80211n=0

wmm_enabled=0

Define as 802.11n

Hw_mode=g

ieee80211n=1

wmm_enabled=1

ieee80211n: Set to 1 to enable 802.11n support, 0 to disable it

channel_num

Define the channel number

channel_num=1

ignore_broadcast_ssid

Enables/disables broadcasting the ssid

ignore_broadcast_ssid=0/1

wpa

Enables/disables WPA.

wpa=0/1/2/3

wpa=0 - disable wpa

wpa=1 - enables wpa1

wpa=2 - enables wpa2

wpa=3 - enables both

wpa_key_mgmt

Controls what key management algorithms a client can authenticate with.

wpa_key_mgmt=WPA-PSK / WPA-EAP

wpa_pairwise


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Controls wpa's data encryption

wpa_pairwise=TKIP / CCMP

wpa_passphrase

This can be either entered as a 256-bit secret in hex format (64 hex digits), wpa_psk, or as an

ASCII passphrase (8..63 characters) that will be converted to PSK. This conversion uses

SSID so the PSK changes when ASCII passphrase is used and the SSID is changed.

wpa_passphrase=1234567890

Documents

LE920/LE910 - Wi-Fi interface Application Note