Rotary encoder with GPIOs - Revision history

JulienB: /* Hardware */

2017-03-14T14:56:04Z

‎Hardware

JulienB: /* Software */

2017-03-03T16:22:24Z

‎Software

JulienB: /* Software */

2017-03-03T16:21:56Z

‎Software

JulienB: /* Software */

2017-03-03T16:19:45Z

‎Software

JulienB: /* Hardware */

2017-03-03T16:17:21Z

‎Hardware

JulienB: Created page with "{{Under_Construction}} =Introduction= This page will explain you how to drive a rotary encoder connected to GPIOs of your APF/OPOS. =Hardware= The instructions were tested o..."

2017-01-26T11:29:46Z

Created page with "{{Under_Construction}} =Introduction= This page will explain you how to drive a rotary encoder connected to GPIOs of your APF/OPOS. =Hardware= The instructions were tested o..."

New page

{{Under_Construction}}

=Introduction=
This page will explain you how to drive a rotary encoder connected to GPIOs of your APF/OPOS.

=Hardware=
The instructions were tested on [[OPOS6ULDev]] where rotary encoder is connected to GPIOs on RPi compatible connector:
Encoder || RPi connector
+ || 1
GND || 6
SW ||
DT 32 ||
CLK 40 ||

=Software=
Device Tree need to be adapted:
<source lang=diff>
gpio-keys {
compatible = "gpio-keys";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_gpio_keys>;

user-button {
label = "User button";
gpios = <&gpio2 11 GPIO_ACTIVE_LOW>;
linux,code = <BTN_MISC>;
wakeup-source;
};

+ rotary1_button {
+ label = "rotary1_button";
+ gpios = <&gpio5 2 GPIO_ACTIVE_LOW>;
+ debounce-interval = <10>;
+ linux,code = <28>;
+ };
}

+ rotary1 {
+ compatible = "rotary-encoder";
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_rotary1>;
+ gpios = <&gpio5 0 1>, <&gpio5 1 1>;
+ linux,axis = <1>; /* REL_Y */
+ rotary-encoder,relative-axis;
+ };

...
&iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_gpios>;

...

+ pinctrl_rotary1: rotary1grp {
+ fsl,pins = <
+ MX6UL_PAD_SNVS_TAMPER0__GPIO5_IO00 0x0b0b0
+ MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01 0x0b0b0
+ >;
+ };

...
</source>

=Links=

[[Category:Multimedia]]

@@ Line 14: / Line 14: @@
 | GND || 6 || GND
 |-
-| SW || || Key press
+| SW || 38 (with 4.7k pullup) || Key press
 |-
 | DT || 32 ||

@@ Line 79: / Line 79: @@
 /dev/input/event1:      rotary1
 ...
 </pre>

@@ Line 74: / Line 74: @@
 <pre class="apf">
 # evtest
+No device specified, trying to scan all of /dev/input/event*
 </pre>

@@ Line 22: / Line 22: @@
 =Software=
-Device Tree need to be adapted:
+* Device tree need to be adapted:
 <source lang=diff>
          gpio-keys {
@@ Line 69: / Line 69: @@
 ...
 </source>
 =Links=
 [[Category:Multimedia]]

@@ Line 6: / Line 6: @@
 =Hardware=
 The instructions were tested on [[OPOS6ULDev]] where rotary encoder is connected to GPIOs on RPi compatible connector:
-Encoder || RPi connector
+{| border="1" cellpadding="5" cellspacing="0" summary="Restart of NFS server depending on your distribution"
-+ || 1
+|- style="background:#efefef;"
-GND || 6
+! Encoder !! Pin number <br>on RPi connector !! Function
-SW ||
+|-
-DT 32 ||
+| + || 1 || Power
-CLK 40 ||
+|-
 =Software=