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==UARTs interface ==


=== Description ===

The UARTs interface available on the Evaluation Kit are mapped to the following connectors:

* J21 is a standard DB9 male connector for the configurable UART1 port. The board provides some configuration options for the selection of the UART mode (RS232/RS422/RS485 with auto-direction)


[[File:AXEL Lite-EVB-DB9-connector.png|thumb|center| 500px|DB9 configuration]]

* J25 is a 6x1x2.54mm horizontal socket header for the UART3 port. This is a Digilent Pmod™ Compatible connector for the UART Pmod™ Compatiblemodule (6-Pin Pmod™ Compatible Connector Digilent Pmod™ Interface Specification Type 4 UART)


[[File:AXEL Lite-EVB-PMOD-connector.png|thumb|center| 500px|PMOD configuration]]

===Signals ===

The following tables describes the interface signals

==== UART1 ====

{{ImportantMessage|text=In the schematics page 13, the signals label are referring to the original AXEL Lite EVK SOM's signals. ''UART5'' is referencing the AXEL Lite UART connection and should be used just as a signal labels.<br>For MITO 8M mini/Nano EVK, the UART connected is '''UART1'''}}

{| class="wikitable"
! latexfontsize="scriptsize" | Pin#
! latexfontsize="scriptsize" | SOM Pin#
! latexfontsize="scriptsize" | Pin name
! latexfontsize="scriptsize" | RS-232
! latexfontsize="scriptsize" | RS-422
! latexfontsize="scriptsize" | RS-485
|-
| 1 || - || Not connected || Not connected || Not connected || Not connected
|-
| 2 || J10.95 || UART5_A || UART5 receive line || UART5_A || UART5_A
|-
| 3 || J10.93 || UART5_Y || UART5 transmit line || UART5_Y || UART5_A
|-
| 4 || - || Not connected || Not connected || Not connected || Not connected
|-
| 5 || - || DGND || Ground || Ground || Ground
|-
| 6 || - || Not connected || Not connected || Not connected || Not connected
|-
| 7 || J10.105 || UART5_Z || UART5 Request To Send || UART5_Z || UART5_B
|-
| 8 || J10.107 || UART5_B || UART5 Clear To Send || UART5_B || UART5_B
|-
| 9 || - || Not connected || Not connected || Not connected || Not connected
|}

The J19 and J20 jumpers are used to configure the UART mode, as reported below:

{| class="wikitable"
! latexfontsize="scriptsize" | Jumper
! latexfontsize="scriptsize" | RS232 mode
! latexfontsize="scriptsize" | RS422 mode
! latexfontsize="scriptsize" | RS485 mode
|-
| 1-3 || open || open || closed
|-
| 5-7 || open || closed || open
|-
| 9-11 || open || closed || open
|-
| 2-4 || open || open || closed
|-
| 6-8 || open || closed || closed
|-
| 10-12 || open || closed || closed
|-
| 13-15 || open || open || closed
|-
| 14-16 || open || open || closed
|}

[[File:AXEL_Lite-EVB-UART5-connector.png|thumb|center| 500px|J19 and J20 connectors]]

[[File: AXEL_Lite_-_EVK-_UART5_configuration_jumpers.jpg|500px|thumb|UART5 jumper configuration|center]]

==== UART3 ====

{| class="wikitable"
! latexfontsize="scriptsize" | Pin#
! latexfontsize="scriptsize" | SOM Pin#
! latexfontsize="scriptsize" | Pin name
! latexfontsize="scriptsize" | Pin function
! latexfontsize="scriptsize" | Pin Notes
|-
| 1 || J10.50 || PMOD_A0 || Clear to send ||
|-
| 2 || J10.89 || PMOD_A1 || Transmit data ||
|-
| 3 || J10.91 || PMOD_A2 || Receive data ||
|-
| 4 || J10.40 || PMOD_A3 || Request to send ||
|-
| 5 || - || DGND || Ground ||
|-
| 6 || - || 3V3 || +3.3 V ||
|}

=== Device mapping ===
* UART1 is mapped to <code>/dev/ttymxc1</code> device in Linux
* UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux

=== Device usage ===

* UART1 is a MultiProtocol that supports (after hardware Jumper configuration) the RS232, RS4222 or RS485 protocols. The related ''device tree file'' has to be properly configured too for enabling the GPIO transceiver configuration.
* UART3 can be used with a PMOD adapter or with a TTL peripheral

----

[[Category:MITO 8M Mini]]
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