Difference between revisions of "ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/USB ports"

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(Created page with "{{subst:EVB_Interfaces_and_Connectors | nome-som=ETRA | nome-peripheral =USB}}")
 
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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
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<section end="History" />
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<section begin=Body/>
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<section begin="Body" />
  
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==USB interface ==
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==USB ports ==
−
 
 
−
''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
 
−
''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
 
  
 
=== Description  ===
 
=== Description  ===
 +
ETRA SBC provides two USB ports, one HOST and one OTG:
 +
* J17 is a standard USB HOST 2.0 Type A connector
 +
[[File:{{{nome-som}}-EVB-USB-HOST-connector.png|thumb|center|500px|USB HOST connector]]
  
−
The USB interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.
+
* J16 is a micro-AB type receptacle for a USB OTG connection: this interface can operate in Host mode and Device (peripheral) mode
−
 
 
−
''Jxx'' is a ''TBD:connector-type'' header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console).
 
−
 
 
−
 
 
 
[[File:{{{nome-som}}-EVB-USB-connector.png|thumb|center|500px|USB connector]]
 
[[File:{{{nome-som}}-EVB-USB-connector.png|thumb|center|500px|USB connector]]
  
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The following table describes the interface signals:
 
The following table describes the interface signals:
  
−
{| class="wikitable"  
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==== USB HOST ====
−
! latexfontsize="scriptsize"| Pin#
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{| class="wikitable"
−
! latexfontsize="scriptsize"| SOM Pin#
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!Pin#
−
! latexfontsize="scriptsize"| Pin name
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!SOM Pin#
−
! latexfontsize="scriptsize"| Pin function
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!Pin name
−
! latexfontsize="scriptsize"| Pin Notes
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!Pin function
 +
!Pin Notes
 +
|-
 +
|1
 +
|J18.188
 +
|USB_HOST_VBUS
 +
|VBUS
 +
|
 +
|-
 +
|2
 +
|J18.202
 +
|USB_DM1
 +
|USB Host Data -
 +
|
 +
|-
 +
|3
 +
|J18.200
 +
|USB_DP1
 +
|USB Host Data +
 +
|
 +
|-
 +
|4
 +
| -
 +
|DGND
 +
|Ground
 +
|
 
|-
 
|-
−
|1,2,4,6,,7,8,10
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|5, 6, 7, 8
 
| -
 
| -
−
| N.A.
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|PCB_GND_RNG
−
| N.C.
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|Shield
−
| Not connected
+
|
 +
|}
 +
 
 +
==== USB OTG ====
 +
{| class="wikitable"
 +
!Pin#
 +
!SOM Pin#
 +
!Pin name
 +
!Pin function
 +
!Pin Notes
 +
|-
 +
|1
 +
|J18.185
 +
|VBUS_OTG_IN
 +
|VBUS
 +
|Can be used to power the board
 +
|-
 +
|2
 +
|J18.196
 +
|USB_DM2
 +
|USB OTG Data -
 +
|
 +
|-
 +
|3
 +
|J18.198
 +
|USB_DP2
 +
|USB OTG Data +
 +
|
 
|-
 
|-
−
| 3
+
|4
−
| J1.189
+
|J18.72
−
| RS232_RX
+
|PA8
−
| Receive line
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|USB OTG ID
−
|  
+
|
 
|-
 
|-
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| 3
+
|5
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| J1.187
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| -
−
| RS232_TX
+
|GND
−
| Transmit line
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|Ground
−
|  
+
|
 
|-
 
|-
−
| 9
+
|6, 7, 8
 
| -
 
| -
−
| DGND
+
|PCB_GND_RNG
−
| Ground
+
|Shield
−
|  
+
|
 
|}
 
|}
  
 
=== Device mapping ===
 
=== Device mapping ===
−
UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.
+
The USB Host port can be used under Linux for connecting USB peripheral devices: the related peripheral driver has to be integrated into the Linux kernel.
−
 
 
−
=== Device usage ===
 
−
 
 
−
To connect to the debug serial port:
 
−
 
 
−
# connect the DB9 adapter bracket to the J22 connector on the SBCX board
 
−
# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
 
−
# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
  
 +
The USB OTG feature can be easily tested using the Mass Storage Gadget driver.
 
----
 
----
  
 
[[Category:ETRA]]
 
[[Category:ETRA]]

Revision as of 15:06, 31 December 2020

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History
Version Issue Date Notes
1.0.0 Dec 2020 First Release


USB ports[edit | edit source]

Description[edit | edit source]

ETRA SBC provides two USB ports, one HOST and one OTG:

  • J17 is a standard USB HOST 2.0 Type A connector

[[File:{Template:Nome-som-EVB-USB-HOST-connector.png|thumb|center|500px|USB HOST connector]]

  • J16 is a micro-AB type receptacle for a USB OTG connection: this interface can operate in Host mode and Device (peripheral) mode

[[File:{Template:Nome-som-EVB-USB-connector.png|thumb|center|500px|USB connector]]

Signals[edit | edit source]

The following table describes the interface signals:

USB HOST[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J18.188 USB_HOST_VBUS VBUS
2 J18.202 USB_DM1 USB Host Data -
3 J18.200 USB_DP1 USB Host Data +
4 - DGND Ground
5, 6, 7, 8 - PCB_GND_RNG Shield

USB OTG[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J18.185 VBUS_OTG_IN VBUS Can be used to power the board
2 J18.196 USB_DM2 USB OTG Data -
3 J18.198 USB_DP2 USB OTG Data +
4 J18.72 PA8 USB OTG ID
5 - GND Ground
6, 7, 8 - PCB_GND_RNG Shield

Device mapping[edit | edit source]

The USB Host port can be used under Linux for connecting USB peripheral devices: the related peripheral driver has to be integrated into the Linux kernel.

The USB OTG feature can be easily tested using the Mass Storage Gadget driver.

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