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ORCA SOM/ORCA Evaluation Kit/Interfaces and Connectors/UARTs

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=== Description ===

The UARTs interfaces ~~are~~ available on the Evaluation Kit at are mapped to the ~~connector J8~~ following connectors: * J8 is a 20x2x2.54mm pin header expansion connector that delivers many interfaces unused on board. ~~Some interfaces could not be available in a specific model~~On this connector are mapped these instances: UART1; UART2 (default debug console); UART4.

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

* J9 is a 8x1x1.25mm 53398-0871 Molex connector that delivers one RS232 4 wires (mapped to UART1) and one RS485 2 wires (mapped to UART3) [[File:{{{nome-som}}-EVB-UARTs-connector.png|thumb|center|500px|UARTs connector]]

===Signals ===

The following ~~table describes~~ tables describe the ~~interface~~ interfaces signals:

==== J8 ====

{| class="wikitable"

! latexfontsize="scriptsize" | Pin#

| SAI2_TXFS

| UART1_CTS

|shared with RS232

|-

| 8

| SAI2_RXFS

| UART1_TXD

| shared with RS232

|-

|10

| SAI2_RXC

| UART1_RXD

| shared with RS232

|-

|11

| SAI2_RXD0

| UART1_RTS

| shared with RS232|-|19|J15.122|ECSPI2_MOSI|UART4_TXD|Transmit signal (OUT)|-|21|J15.120|ECSPI2_MISO|UART4_CTS|Clear to send (OUT)|-|23|J15.124|ECSPI2_SCLK|UART4_RXD|Receive signal (IN)|-|24|J15.126|ECSPI2_SS0|UART4_RTS|Request to send (IN)|-|27|J15.248|UART2_RXD|UART2_RXD|default debug console|-|29|J15.250|UART2_TXD|UART2_TXD|default debug console

|-

|31

|J15.256

|UART4_RXD

|alternative to ECSPI2_SCLK

|-

|33

|J15.258

|UART4_TXD

|alternative to ECSPI2_MOSI

|-

|1, 17

| -

|3V3_CB

|Power output for transceiver supply

|BOARD_PGOOD driven rail

|-

|6, 9, 14, 20, 25, 30, 34, 39

| -

|DGND

|Ground

|

|}

=== J9 ===

{| class="wikitable"

! latexfontsize="scriptsize" | Pin#

! latexfontsize="scriptsize" | SOM Pin#

! latexfontsize="scriptsize" | Pin name

! latexfontsize="scriptsize" | Pin function

! latexfontsize="scriptsize" | Pin Notes

|-

|1

| -

| RS485_A

|Non inverting BUS signal

|

|-

|2

| -

| RS485_B

|Inverting BUS signal

|

|-

|3

| -

| RS485_B_120R

|Termination resistor

|connect this signal to RS485_B

to enable the 120R termination

|-

|4

| -

| DGND

|Ground

|

|-

|5|J15.144|RS232_TX|Transmit line|shared with J8.8|-|6|J15.140|RS232_RX|Receive line|shared with J8.10

|-

|-

|}

=== Device mapping ===

~~UART3~~ UART1 is mapped to <code>/dev/ttymxc0</code> device in Linux UART2 is mapped to <code>/dev/~~ttymxc2~~ttymxc1</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel. UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux UART4 is mapped to <code>/dev/ttymxc3</code> device in Linux

=== Device usage ===

~~To connect~~ The TTL UARTs on J8 can be connected to ~~the debug serial port:~~external devices that use 0-3.3V levels.

~~# connect the DB9 adapter bracket to the J22 connector on~~ The RS232 and RS485 uses 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~~standard protocols.

----

[[Category:ORCA SOM]]

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