Specialized USB cables

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You can buy [[http://www.jaykang.com/usbafetousbm1.html this]] ready-made USB A-Type Female to USB Mini-B Type 5 Pin Male Adapter.
 
You can buy [[http://www.jaykang.com/usbafetousbm1.html this]] ready-made USB A-Type Female to USB Mini-B Type 5 Pin Male Adapter.
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=== How to make a mini type B plug to a type A jack cable ===
 
=== How to make a mini type B plug to a type A jack cable ===
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You can buy [[http://www.jaykang.com/usbtyfetotyf.html this]] ready-made USB Type A Female to Female Gender Changer.
 
You can buy [[http://www.jaykang.com/usbtyfetotyf.html this]] ready-made USB Type A Female to Female Gender Changer.
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=== How to make a type A jack to a type A jack adapter (gender changer) ===
 
=== How to make a type A jack to a type A jack adapter (gender changer) ===
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Note that these instructions are provided in the hope that they are useful but without any warranty!
 
Note that these instructions are provided in the hope that they are useful but without any warranty!
  
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:#Find an old motherboard with a set of two USB receptacles as shown above.
 
:#Find an old motherboard with a set of two USB receptacles as shown above.
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:#At your own risk, switch freerunner to USB host mode and connect an USB device to the other receptacle of the adapter. Here's how the setup should look like:
 
:#At your own risk, switch freerunner to USB host mode and connect an USB device to the other receptacle of the adapter. Here's how the setup should look like:
  
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==== Compatibility ====
 
==== Compatibility ====

Revision as of 16:28, 30 August 2008

NOTE: work in progress


Contents

Attaching the Neo (acting as a USB host) to a USB device

The USB port (5 position mini type B jack) on the Neo 1973 and Neo FreeRunner can be both a USB device or a USB host. The provided cable (5 position mini type B plug to type A plug) is used when attaching the Neo to a USB host.

A specialized cable is required when attaching the Neo to a USB device, which provides a USB type A jack at the end.

(picture)

Alternately, an adapter capable of connecting two type A plugs will allow attaching the provided USB cable to the USB cable that came with the USB device. This adapter is also known as a gender changer.

(picture)

Ready-made mini type B plug to a type A jack cable

You can buy [this] ready-made USB A-Type Female to USB Mini-B Type 5 Pin Male Adapter.

Jaykang usbafetousbm1.jpg

How to make a mini type B plug to a type A jack cable

(picture, as soon as I build it)

Parts list:

  • Mini type B plug: Digi-Key [H2958-ND]
  • type A jack: I have not yet been able to find a source for these. Meanwhile, use the jack from a standard USB extension cord
  • Cable: Ideally, the data lines should be twisted and 28 AWG, the power lines should be 20 or 28 AWG, e.g. Hitachi Cable [49248 ]

Construction instructions:

(TBA)

Ready-made type A jack to a type A jack adapter (gender changer)

You can buy [this] ready-made USB Type A Female to Female Gender Changer.

Jaykang usbtyfetotyf.jpg

How to make a type A jack to a type A jack adapter (gender changer)

This community provided instruction shows how to build an adapter from a USB socket salvaged from a computer motherboard.

Note that these instructions are provided in the hope that they are useful but without any warranty!

2-usb-receptables.jpg
  1. Find an old motherboard with a set of two USB receptacles as shown above.
  2. Desolder this set of receptacles from the motherboard. This can be bit tricky but it is doable at least with a desoldering gun.
  3. Each receptacle has four pins. Use a multimeter to verify that you have no short circuits between the pins or the shield.
  4. Solder adjacent pins together (GND to GND, D- to D-, D+ to D+, VCC to VCC).
  5. (Optional) Build a test cable. Cut an USB cable with A plug into half, connect it a receptacle and again measure that you have no short circuits. Then connect the test cable to PC and verify that you see 
black GND
green 0V
white 0V
red +5V
  1. Freerunner is shipped with a mini-B-to-A-plug cable. Connect this to a receptacle.
  2. (Optional)Connect test cable to the other receptacle and verify that you see 
black GND
green 0V
white 0V
red 0V

when freerunner acts as a device and 

black GND
green 0V
white 0V
red +5V

when it acts as a host.

  1. At your own risk, switch freerunner to USB host mode and connect an USB device to the other receptacle of the adapter. Here's how the setup should look like:
  • Usb-gender-changer1.jpg
  • Usb-gender-changer2.jpg

Compatibility

The adapter works with kingston data traveller 4G memory stick and aiptec pencam webcam. However, for some reason (probably the missing 15k resistors at D+ and D-) it did not work with any of the tested USB keyboards or mice: 

usb 1-2: new full speed USB device using s3c2410-ohci and address 24
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 25
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 26
usb 1-2: device not accepting address 26, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 27
usb 1-2: device not accepting address 27, error -62

However, if I connect neo to small (unpowered) USB hub 

usb 1-2: new full speed USB device using s3c2410-ohci and address 61
usb 1-2: configuration #1 chosen from 1 choice
hub 1-2:1.0: USB hub found
hub 1-2:1.0: 4 ports detected

and connect the keyboard to the hub then it is correctly recognized: 

usb 1-2.3: new low speed USB device using s3c2410-ohci and address 62
usb 1-2.3: configuration #1 chosen from 1 choice
input:   USB Keyboard as /devices/platform/s3c2410-ohci/usb1/1-2/1-2.3/1-2.3:1.0/input/input13
input: USB HID v1.10 Keyboard [  USB Keyboard] on usb-s3c24xx-2.3
input:   USB Keyboard as /devices/platform/s3c2410-ohci/usb1/1-2/1-2.3/1-2.3:1.1/input/input14
input: USB HID v1.10 Device [  USB Keyboard] on usb-s3c24xx-2.3

With the hub I can also use both keyboard and usb memory stick at the same time.

Power consumption

When I unplug the USB hub (with only keyboard connected to it) the power consumption estimate at /sys/devices/platform/bq2700-battery.0/power_supply/bat/current_now decreases from 175000 to 145000 (are these microamperes?).

How to make a USB cable for powering attached USB devices and charging the Neo while in host mode

This cable might be necessary for a number of reasons, e.g.

  • The application requires that the Neo not become suspended
  • The application requires long run time
  • The attached USB device consumes a lot of power

These instructions will show you how to make a cable with 3 ends:

  • A mini-USB type B cable for the Neo itself
  • A cable of whatever type to go to your USB device.
  • A cable going to a +5V +/-10%(max!) power supply with enough power for your device and to charge the Neo. This could be a wall charger or even another USB plug.

You connect the Data+ and Data- wires of the Neo and the device, and connect all of the ground wires together and all of the +5V wires together. This powers the Neo and the device, while letting the neo talk to the device. You have to connect 2pcs 15kOhm resistors, one from D+ to ground, and one from D- to ground, to comply with USB-spec for hostmode, as Neo is switching off the internal resistors when you enable charging/powering over USB by asserting EN_USBHOST. See schematics, LOCATION:49XX

Just for reference, the USB wires from left to right are:

  • Black: Power -
  • Green: Data -
  • White: Data +
  • Red: Power +

The Mini_USB-B connector has a fifth pin, the ID-pin. This pin is supposed to be short to ground to signal Freerunner to enter hostmode. For the Y-cable and enabling external power while in hostmode, you may connect a 47kOhm resistor from ID-pin to ground. This is the same trick the OM-wallcharger uses to signal to Freerunner it can charge with 1A. Future kernels should switch to hostmode + external power when seeing this 47k resistor.

Retrieved from "http://openmoko.org/index.php?title=Specialized_USB_cables&oldid=50627"
Personal tools
NOTE: work in progress


Attaching the Neo (acting as a USB host) to a USB device

The USB port (5 position mini type B jack) on the Neo 1973 and Neo FreeRunner can be both a USB device or a USB host. The provided cable (5 position mini type B plug to type A plug) is used when attaching the Neo to a USB host.

A specialized cable is required when attaching the Neo to a USB device, which provides a USB type A jack at the end.

(picture)

Alternately, an adapter capable of connecting two type A plugs will allow attaching the provided USB cable to the USB cable that came with the USB device. This adapter is also known as a gender changer.

(picture)

Ready-made mini type B plug to a type A jack cable

You can buy [this] ready-made USB A-Type Female to USB Mini-B Type 5 Pin Male Adapter. Jaykang usbafetousbm1.jpg

How to make a mini type B plug to a type A jack cable

(picture, as soon as I build it)

Parts list:

  • Mini type B plug: Digi-Key [H2958-ND]
  • type A jack: I have not yet been able to find a source for these. Meanwhile, use the jack from a standard USB extension cord
  • Cable: Ideally, the data lines should be twisted and 28 AWG, the power lines should be 20 or 28 AWG, e.g. Hitachi Cable [49248 ]

Construction instructions:

(TBA)

Ready-made type A jack to a type A jack adapter (gender changer)

You can buy [this] ready-made USB Type A Female to Female Gender Changer. Jaykang usbtyfetotyf.jpg

How to make a type A jack to a type A jack adapter (gender changer)

This community provided instruction shows how to build an adapter from a USB socket salvaged from a computer motherboard.

Note that these instructions are provided in the hope that they are useful but without any warranty!

2-usb-receptables.jpg

  1. Find an old motherboard with a set of two USB receptacles as shown above.
  2. Desolder this set of receptacles from the motherboard. This can be bit tricky but it is doable at least with a desoldering gun.
  3. Each receptacle has four pins. Use a multimeter to verify that you have no short circuits between the pins or the shield.
  4. Solder adjacent pins together (GND to GND, D- to D-, D+ to D+, VCC to VCC).
  5. (Optional) Build a test cable. Cut an USB cable with A plug into half, connect it a receptacle and again measure that you have no short circuits. Then connect the test cable to PC and verify that you see 
black GND
green 0V
white 0V
red +5V
  1. Freerunner is shipped with a mini-B-to-A-plug cable. Connect this to a receptacle.
  2. (Optional)Connect test cable to the other receptacle and verify that you see 
black GND
green 0V
white 0V
red 0V

when freerunner acts as a device and 

black GND
green 0V
white 0V
red +5V

when it acts as a host.

  1. At your own risk, switch freerunner to USB host mode and connect an USB device to the other receptacle of the adapter. Here's how the setup should look like:

Usb-gender-changer1.jpg Usb-gender-changer2.jpg

Compatibility

The adapter works with kingston data traveller 4G memory stick and aiptec pencam webcam. However, for some reason (probably the missing 15k resistors at D+ and D-) it did not work with any of the tested USB keyboards or mice: 

usb 1-2: new full speed USB device using s3c2410-ohci and address 24
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 25
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 26
usb 1-2: device not accepting address 26, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 27
usb 1-2: device not accepting address 27, error -62

However, if I connect neo to small (unpowered) USB hub 

usb 1-2: new full speed USB device using s3c2410-ohci and address 61
usb 1-2: configuration #1 chosen from 1 choice
hub 1-2:1.0: USB hub found
hub 1-2:1.0: 4 ports detected

and connect the keyboard to the hub then it is correctly recognized: 

usb 1-2.3: new low speed USB device using s3c2410-ohci and address 62
usb 1-2.3: configuration #1 chosen from 1 choice
input:   USB Keyboard as /devices/platform/s3c2410-ohci/usb1/1-2/1-2.3/1-2.3:1.0/input/input13
input: USB HID v1.10 Keyboard [  USB Keyboard] on usb-s3c24xx-2.3
input:   USB Keyboard as /devices/platform/s3c2410-ohci/usb1/1-2/1-2.3/1-2.3:1.1/input/input14
input: USB HID v1.10 Device [  USB Keyboard] on usb-s3c24xx-2.3

With the hub I can also use both keyboard and usb memory stick at the same time.

Power consumption

When I unplug the USB hub (with only keyboard connected to it) the power consumption estimate at /sys/devices/platform/bq2700-battery.0/power_supply/bat/current_now decreases from 175000 to 145000 (are these microamperes?).

How to make a USB cable for powering attached USB devices and charging the Neo while in host mode

This cable might be necessary for a number of reasons, e.g.

  • The application requires that the Neo not become suspended
  • The application requires long run time
  • The attached USB device consumes a lot of power

These instructions will show you how to make a cable with 3 ends:

  • A mini-USB type B cable for the Neo itself
  • A cable of whatever type to go to your USB device.
  • A cable going to a +5V +/-10%(max!) power supply with enough power for your device and to charge the Neo. This could be a wall charger or even another USB plug.

You connect the Data+ and Data- wires of the Neo and the device, and connect all of the ground wires together and all of the +5V wires together. This powers the Neo and the device, while letting the neo talk to the device. You have to connect 2pcs 15kOhm resistors, one from D+ to ground, and one from D- to ground, to comply with USB-spec for hostmode, as Neo is switching off the internal resistors when you enable charging/powering over USB by asserting EN_USBHOST. See schematics, LOCATION:49XX

Just for reference, the USB wires from left to right are:

  • Black: Power -
  • Green: Data -
  • White: Data +
  • Red: Power +

The Mini_USB-B connector has a fifth pin, the ID-pin. This pin is supposed to be short to ground to signal Freerunner to enter hostmode. For the Y-cable and enabling external power while in hostmode, you may connect a 47kOhm resistor from ID-pin to ground. This is the same trick the OM-wallcharger uses to signal to Freerunner it can charge with 1A. Future kernels should switch to hostmode + external power when seeing this 47k resistor.