This version is outdated by a newer approved version.
This version (25 Apr 2017 15:42) was approved by Michael Hennerich.
This version (25 Apr 2017 15:42) was approved by Michael Hennerich.This is an old revision of the document!
Table of Contents
USB OTG – HOST function Support
When the device is powered from the Auxiliary Power Supply it support various HOST functions, such as USB WIFI, Storage and HID. Using the correct cables is the key to OTG operation.
USB Wifi Support
PlutoSDR or M2k allows WIFI connectivity using ESSID and WPA-PSK passphrase.
The ESSID and Passphrase is set using the config.txt file in the Mass Storage Device.
The ESSID string is at most 32 alphanumeric characters, and the passphrase is at least 8 and at most 63 ASCII characters.
Supported WIFI chipsets
Linux supports a large number of USB 802.11 WIFI modules. Most of these also require a firmware file to be available on the host device. Given the constrained flash memory footprint of the device, the decision was made to support only a number of popular Ralink and Realtek based chipset modules. This includes also a few unstable drivers from the kernel staging area, so not all modules will work equally well.
Supported chipsets:
- Ralink rt2501/rt61
- Ralink rt73
- Ralink rt27xx/rt28xx/rt30xx
- Realtek 81xx
- Realtek 87xx
- Realtek 88xx
Many cheap and widely available modules will work - If you need a recommendation. The models listed below have been tested:
- TP-Link TL-WN725N Nano WLAN
Mass Storage Drive Support
PlutoSDR or M2k allows in OTG Host mode the attachment of USB Mass Storage Devices. The supported file systems is currently FAT/FAT32 only. Kernel Hotplug mechanisms are used to automount the available partitions under /media. Once the storage is mounted the LED1 will stay constantly ON. Upon storage removal the media un-mounted and the LED1 will resume its heartbeat flash. There is also a save unmount functionality implemented using the hidden button. If pressed while a media is mounted the media is unmounted and the LED1 will also resume to heartbeat flash.
Someone may ask what’s the purpose of the USB Mass Storage Device Support?
Auto Run Support
After mounting the attached storage the filesystem root is scanned for files named runme[XX][.sh]. Where XX is optimal or can be any decimal numbers starting from 0..99. The number defines the sequence in which the scripts or executables are executed. If the file extension is .sh the shell script is sourced for speed. If no .sh extension a subprocess is forked.
university/tools/pluto/usb_otg_host_function_support.1493127768.txt.gz · Last modified: 25 Apr 2017 15:42 by Michael Hennerich