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

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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
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<section begin="Body" />
  
 
==UARTs interface ==
 
==UARTs interface ==
−
 
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''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
 
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''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
 
  
 
=== Description  ===
 
=== Description  ===
  
−
The UARTs interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.  
+
The UART interfaces are available on the Evaluation Kit at the connectors J9 and J10.  
  
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''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).
+
J9 and J10 are 3 pin terminal blocks 5.0mm pitch respectively for USART3 and UART8. Can be independently used as RS232 or RS485 based on kit model. '''TODO:aggiungere link alla pagina di composizione P/N'''
  
  
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The following table describes the interface signals:
 
The following table describes the interface signals:
  
 +
==== J9 ====
 
{| class="wikitable"  
 
{| class="wikitable"  
−
! latexfontsize="scriptsize"| Pin#
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! latexfontsize="scriptsize" | Pin#
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! latexfontsize="scriptsize"| SOM Pin#
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! latexfontsize="scriptsize" | SOM Pin#
−
! latexfontsize="scriptsize"| Pin name
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! latexfontsize="scriptsize" | RS232
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! latexfontsize="scriptsize"| Pin function
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! latexfontsize="scriptsize" | RS485
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! latexfontsize="scriptsize"| Pin Notes
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! latexfontsize="scriptsize" | Pin Notes
 +
|-
 +
|1
 +
| J18.89
 +
| USART3_TX
 +
| RS485_A
 +
|
 
|-
 
|-
−
|1,2,4,6,,7,8,10
+
| 2
 +
| J18.91
 +
| USART3_RX
 +
| RS485_B
 +
|
 +
|-
 +
| 3
 
| -
 
| -
−
| N.A.
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| Ground
−
| N.C.
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| Ground
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| Not connected
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|  
 +
|}
 +
 
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==== J10 ====
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{| class="wikitable"
 +
! latexfontsize="scriptsize" | Pin#
 +
! latexfontsize="scriptsize" | SOM Pin#
 +
! latexfontsize="scriptsize" | RS232
 +
! latexfontsize="scriptsize" | RS485
 +
! latexfontsize="scriptsize" | Pin Notes
 
|-
 
|-
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| 3
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|1
−
| J1.189
+
| J18.191
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| RS232_RX
+
| UART8_TX
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| Receive line
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| RS485_A
 
|  
 
|  
 
|-
 
|-
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| 3
+
| 2
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| J1.187
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| J18.193
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| RS232_TX
+
| UART8_RX
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| Transmit line
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| RS485_B
 
|  
 
|  
 
|-
 
|-
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| 9
+
| 3
 
| -
 
| -
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| DGND
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| Ground
 
| Ground
 
| Ground
 
|  
 
|  
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=== 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.
+
USART3 is mapped to <code>/dev/ttyxxx</code> device in Linux.
 +
 
 +
UART8 is mapped to <code>/dev/ttyxxx</code> device in Linux.
  
 
=== Device usage ===
 
=== Device usage ===
−
 
+
Fix the signal cables to the terminal with a small flat screwdriver.
−
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)
 
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# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
−
 
 
 
----
 
----
  
 
[[Category:ETRA]]
 
[[Category:ETRA]]

Revision as of 14:29, 31 December 2020

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History
Version Issue Date Notes
1.0.0 Dec 2020 First Release


UARTs interface[edit | edit source]

Description[edit | edit source]

The UART interfaces are available on the Evaluation Kit at the connectors J9 and J10.

J9 and J10 are 3 pin terminal blocks 5.0mm pitch respectively for USART3 and UART8. Can be independently used as RS232 or RS485 based on kit model. TODO:aggiungere link alla pagina di composizione P/N


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

Signals[edit | edit source]

The following table describes the interface signals:

J9[edit | edit source]

Pin# SOM Pin# RS232 RS485 Pin Notes
1 J18.89 USART3_TX RS485_A
2 J18.91 USART3_RX RS485_B
3 - Ground Ground

J10[edit | edit source]

Pin# SOM Pin# RS232 RS485 Pin Notes
1 J18.191 UART8_TX RS485_A
2 J18.193 UART8_RX RS485_B
3 - Ground Ground

Device mapping[edit | edit source]

USART3 is mapped to /dev/ttyxxx device in Linux.

UART8 is mapped to /dev/ttyxxx device in Linux.

Device usage[edit | edit source]

Fix the signal cables to the terminal with a small flat screwdriver.

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