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! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |1.0.0{{oldid| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" 14093|Oct 20202021/07/16}}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First DESK -MX6-L release
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |3.0.0{{oldid| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" 16263|Feb 2022/03/03}}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK-MX6-L 3.0.0 DESK release
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |Add RS282/RS485 setting mode
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |DESK-MX6-L 4.0.0 release
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<pre>
uart2 {
fsl,pins = <
MX6QDL_PAD_SD3_DAT4__UART2_RX_DATA 0x1b0b1
...
...
[ 10.010016302170] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 78, base_baud = 5000000) is a IMX[ 10.011009303041] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 79, base_baud = 5000000) is a IMX[ 20.198543569731] printk: console [ttymxc2] enabled[ 0.582478] 21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 80, base_baud = 5000000) is a IMX[ 20.208297594030] 21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 81, base_baud = 5000000) is a IMX
...
...
root@imx6qxelk:~#
</pre>
==== Configuring the RS232/RS485 mode====
When the UART5 (aka <code>/dev/ttymxc4</code> device in Linux) is properly configured using the hardware jumpers (see [[AXEL_Lite_SOM/AXEL_Lite_Evaluation_Kit/Interfaces_and_Connectors/UARTs#UART5 | Interfaces and Connectors - UART5]] EVK page), the MultiProtocol transceiver pins has to be initialized for setting the related user selectable modes: the RS232 or RS485 mode can be selected with the <code>gpio-leds</code> class and the led <code>rs232_on</code>.
From <code>imx6q-sbcx-cb0012.dts</code> or <code>imx6dl-sbcx-cb0012.dts</code>:
<pre>
leds {
compatible = "gpio-leds";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_rs232_485_422_1>;
rs232_485_422 {
gpios = <&gpio7 13 GPIO_ACTIVE_HIGH>;
linux,default-trigger = "default-on";
};
rs232_on {
gpios = <&gpio5 29 GPIO_ACTIVE_LOW>;
linux,default-trigger = "default-on";
};
};
</pre>
===== RS232 mode =====
This is the default protocol mode; this can be also activated (when different) using the following command:
<pre class="workstation-terminal">
root@desk-mx6:~# echo 0 > /sys/class/leds/rs232_on/brightness
</pre>
===== RS485 mode =====
This mode can be activated using the following command:
<pre class="workstation-terminal">
root@desk-mx6:~# echo 255 > /sys/class/leds/rs232_on/brightness
</pre>