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Table of Contents

Rotary Driver

Introduction

SC5xx processors feature an up/down counter and thumbwheel interface.

A 32-bit up/down counter is provided that can sense 2-bit quadrature or binary codes as typically emitted by industrial drives or manual thumb wheels. The counter can also operate in general-purpose up/down count modes, in which case count direction is either controlled by a level sensitive input pin or by two edge detectors. A third input can provide flexible zero marker support and can alternatively be used to input the push-button signal of thumb wheels. All three pins have a programmable debouncing circuit.

Hardware Setup

  • An ADSP-SC5xx EZ-Board: 
    • ADSP-SC584 Ezkit v1.0 and above, or,
    • ADSP-SC573 Ezkit v1.2 (BOM 1.8) and above

The SC589-EZKIT board does not include the rotary input hardware.

Software Configuration

As the Rotary hardware pin conflicts with MSI function on the ADSP-SC573 EZ-Board, thumb wheel switch is disabled by default in U-Boot for ADSP-SC573 EZ-Board out of box. To enable thumb wheel hardware switch, you should enable the thumb wheel switch in U-Boot and disable MSI function in Linux kernel. Please refer to ADSP-SC573 EZ-Board schematic and the section Mobile Storage Interface for MMC/SD for more information.

Disable MSI function in Linux kernel:

Device Drivers 

MMC/SD/SDIO card support  --->

[*] Synopsys DesignWare Memory Card Interface [*] Synopsys Designware MCI Support as platform device 

	[N]    ADI specific extensions for Synopsys DW Memory Card Interface  

As the Rotary hardware pin conflicts with EMAC RESET pin of Ethernet PHY DP83865/BCM89810 on the ADSP-SC584 EZ-Board, you should disable Ethernet function in Linux kernel. Please refer to ADSP-SC584 EZ-Board schematic and the section

Ethernet driver and performance for more information.

Disable EMAC driver in Linux kernel:

Device Drivers —> 

  [*] Network device support  --->
      [*]   Ethernet driver support  --->
          [*]   STMicroelectronics devices
              <N>     STMicroelectronics 10/100/1000 Ethernet driver
              <N>       STMMAC Platform bus support

Disable Ethernet PHY device driver in Linux kernel:

Device Drivers —> 

  [*] Network device support  --->
      -*-   PHY Device support and infrastructure  --->
          <N>  National Semiconductor PHYs 

Configure Linux kernel  You need to enable the ADI rotary driver in Linux kernel. 

Device Drivers  —>     Input device support  —>         <*>   Event interface            [*]   Miscellaneous devices  —>             <*>   ADI Rotary support Configure Buildroot You should also enable the event test program to assist with testing.

Add the event test program in the filesystem images, it's enabled in adsp-sc5xx-full image by default. vim build/conf/local.conf IMAGE_INSTALL_append = “evtest”

The driver provides two options. It can either send Key (KEY) or Relative (REL) events.

Option 1 – send Key events: Provide two KEY Codes for: 

rotary_up_key = KEY_PLUS rotary_down_key = KEY_MINUS Option 2 – send REL events: Provide one REL event type: 

rotary_rel_code = REL_WHEEL

In case your CZM input is connected (push-button signal of thumb wheels) Specify the KEY event – this will enable the CZM input. See include/linux/input.h for a full list of supported events.

rotary_button_key = KEY_ENTER The debounce prescale value is used to select the noise filtering characteristic of the input pins. Must be in the range of  0..17

debounce = 10 The driver supports various Counter types

cnt_mode = CNTMODE_QUADENC Example  You will get following information when the rotary hardware device is turned left, right or pushed.

# evtest /dev/input/event0 Input driver version is 1.0.1 Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100 Input device name: “3100b000.cnt” Supported events: 

Event type 0 (Sync)
Event type 1 (Key)
  Event code 28 (Enter)
Event type 3 (Absolute)
  Event code 8 (Wheel)
    Value      0
    Min     -256
    Max      256

Testing … (interrupt to exit) Event: time 172.195518, type 3 (Absolute), code 8 (Wheel), value 1 Event: time 172.195518, ————-- Report Sync ———— Event: time 172.206199, type 3 (Absolute), code 8 (Wheel), value 2 Event: time 172.206199, ————-- Report Sync ———— Event: time 172.211954, type 3 (Absolute), code 8 (Wheel), value 3 Event: time 172.211954, ————-- Report Sync ———— Event: time 172.218301, type 3 (Absolute), code 8 (Wheel), value 4 Event: time 172.218301, ————-- Report Sync ———— Event: time 172.401334, type 3 (Absolute), code 8 (Wheel), value 5 Event: time 172.401334, ————-- Report Sync ———— Event: time 172.485123, type 3 (Absolute), code 8 (Wheel), value 4 Event: time 172.485123, ————-- Report Sync ———— Event: time 173.511092, type 3 (Absolute), code 8 (Wheel), value 3 Event: time 173.511092, ————-- Report Sync ———— Event: time 173.565120, type 3 (Absolute), code 8 (Wheel), value 2 Event: time 173.565120, ————-- Report Sync ———— Event: time 173.582020, type 3 (Absolute), code 8 (Wheel), value 1 Event: time 173.582020, ————-- Report Sync ———— Event: time 173.600967, type 3 (Absolute), code 8 (Wheel), value 0 Event: time 173.600967, ————-- Report Sync ———— Event: time 175.609542, type 3 (Absolute), code 8 (Wheel), value 1 Event: time 175.609542, ————-- Report Sync ———— Event: time 175.624487, type 3 (Absolute), code 8 (Wheel), value 2 Event: time 175.624487, ————-- Report Sync ———— Event: time 175.629124, type 3 (Absolute), code 8 (Wheel), value 3 Event: time 175.629124, ————-- Report Sync ———— Event: time 175.633278, type 3 (Absolute), code 8 (Wheel), value 4 Event: time 175.633278, ————-- Report Sync ———— Event: time 176.719340, type 3 (Absolute), code 8 (Wheel), value 5 Event: time 176.719340, ————-- Report Sync ———— Event: time 176.741497, type 3 (Absolute), code 8 (Wheel), value 6 Event: time 176.741497, ————-- Report Sync ———— Event: time 176.748370, type 3 (Absolute), code 8 (Wheel), value 7 Event: time 176.748370, ————-- Report Sync ———— Event: time 176.754401, type 3 (Absolute), code 8 (Wheel), value 8 Event: time 176.754401, ————-- Report Sync ———— Event: time 177.670738, type 3 (Absolute), code 8 (Wheel), value 9 Event: time 177.670738, ————-- Report Sync ———— Event: time 177.691486, type 3 (Absolute), code 8 (Wheel), value 10 Event: time 177.691486, ————-- Report Sync ———— Event: time 177.698444, type 3 (Absolute), code 8 (Wheel), value 11 Event: time 177.698444, ————-- Report Sync ———— Event: time 177.705056, type 3 (Absolute), code 8 (Wheel), value 12 Event: time 177.705056, ————-- Report Sync ———— Event: time 178.598188, type 3 (Absolute), code 8 (Wheel), value 11 Event: time 178.598188, ————-- Report Sync ———— Event: time 178.700345, type 3 (Absolute), code 8 (Wheel), value 10 Event: time 178.700345, ————-- Report Sync ———— Event: time 178.710039, type 3 (Absolute), code 8 (Wheel), value 9 Event: time 178.710039, ————-- Report Sync ———— Event: time 178.716659, type 3 (Absolute), code 8 (Wheel), value 8 Event: time 178.716659, ————-- Report Sync ———— Event: time 179.628879, type 3 (Absolute), code 8 (Wheel), value 7 Event: time 179.628879, ————-- Report Sync ———— Event: time 179.705605, type 3 (Absolute), code 8 (Wheel), value 6 Event: time 179.705605, ————-- Report Sync ———— Event: time 179.714243, type 3 (Absolute), code 8 (Wheel), value 5 Event: time 179.714243, ————-- Report Sync ———— Event: time 179.719841, type 3 (Absolute), code 8 (Wheel), value 4 Event: time 179.719841, ————-- Report Sync ————

resources/tools-software/linuxdsp/docs/linux-kernel-and-drivers/rotary/rotary.1593753904.txt.gz · Last modified: 03 Jul 2020 07:25 by Sunny Feng

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