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wio:wiopi-en

WIOpi

Introduction

WIOpi is a program targeted for the Raspberry Pi and its GPIO.
The hardware requirements and support are the same as for RocNetNode.
By running the WIOpi program on the Raspberry Pi, it will behave and process like a WIO on ESP base.

WIOpi runs in context of user pi.

The user pi is default in the groups gpio, i2c and spi, so no need to run WIOpi in super user context.

$ groups
pi adm dialout cdrom sudo audio video plugdev games users input netdev gpio i2c spi

The following files and directories are extracted:

.
├── cam
│   └── cam.py
├── reboot.sh
├── scripts
│   └── Disco00.led
├── startwiopi.sh
├── update.sh
└── wiopi

The commands to start and stop the cam.py Python script can be specified in the wiopi.ini.
Defauls are:

    <var name="startcam" vt="string" defval="nohup python3 cam/cam.py &amp;"/>
    <var name="stopcam" vt="string" defval="killall python3"/>


Install

Activate I2C, SPI and UART in the raspi-conf utility.

cd
mkdir WIOpi
cd WIOpi
wget https://wiki.rocrail.net/rocrail-snapshot/WIOpi-ARMHF.tar.gz
tar xf WIOpi-ARMHF.tar.gz
rm WIOpi-ARMHF.tar.gz

Add a crontab task:

@reboot /home/pi/WIOpi/startwiopi.sh

The ARMHF build runs also under PiOS 64bit. (ARM64)


Command Line Options

Option Description
-t <filename> trace filename
-server <ip> Rocrail server IP or DNS name
-id <1…255> WIOpi Node ID


Pinout

The Pinout and mapping is printed in the console after startup.
It depends on the configuration found in the wiopi.ini.
See for Raspberry Pi Pinout information: https://de.pinout.xyz


Supported Hardware

  • Pi02 (max. 4 = 128 I/O)
  • Pi03 (max. 4 = 64 Servo)
  • Pi06 (Power & Patch)
  • Pi08 (max. 8 = 128 LED. Output address < = 128)
  • ID12 RFID reader on Pi01
  • SSD1306 / SH1106 OLED (max. 2, restricted by the I2C addressing of the SSD1306 / SH1106)
    Note: The SH1106 seems incompatible with the Pi01, I2C Driver, so it must be connected directly to the I2C pins.
  • HT16K33 (max. 2 Clock)
  • BMx280 (max. 2 Environment)
  • GCA214 RailCom reader on Pi01 (PiOS 32bit only because of the none standard baudrate of 250000.)
  • Play sound with "omxplayer" (Without prefix forward slash)
  • Mobile soft PWM for controlling a DC Motor (Power MOSFET and bistable direction relay)
  • WS2801 RGB LEDs over SPI (Output address > 128)
    • LEDScript support in case Port Type is set to Macro.
  • 2 Servos on the hardware PWM pins (phys. 32 & 33). 1)
  • Analog inputs: PCF8591 and ADS1115


Sound

The Servo outputs, PWM0 and PWM1, can also be used for audio:

dtoverlay=pwm-2chan,pin=12,func=2,pin2=13,func2=4

The filter is quit simple: (Example is for just one channel.)

                  1µ
                 || | 
Servo0 -+---+----|| |----+
        |   |    || |    |   /|
       +-+  |            |  / |
       |1| ---         +---+  |
       |5| --- 33n     |   |  |
       |0|  |          |   |  |
       +-+  |          +---+  |
        |   |            |  \ |
   GND -+---+------------+   \|


Pi01

LED functions

Both LEDs will flash fast on a show command to identify itself.
Another show command will stop this flashing.

LED1 (green) Description
Off WIOpi does not run, or no GPIO access granted.
Slow flash Normal function.
Fast flash No Rocrail server connection.


LED2 (red) Description
Off Idle communication.
Flash Packet received.


Pushbutton

In case both LEDs are flashing to identify itself, it will stop this mode.
Otherwise it sends a query response to the Server.


Signals on Pi02/Pi08

Signals Support is also available on the Pi02, with address offset 129.

Pi08: 1…128
Pi02: 129…256 (mapped on 1…128)
WS2801


Stepper Control

See for turntable setup: WIO Stepper
img_20201213_122942_0.jpg

4 Wire
Function Header GPIO
IN1 (Coil 1) 7 4
GND 9 -
IN2 (Coil 2) 11 17
IN3 (Coil 3) 13 27
IN4 (Coil 4) 15 22
HALL (Calibrate) 21 9


3w-wired.jpg

3 Wire
Function Header GPIO Example TB6600
STEP(Clock) 7 4 CLK+
GND 9 - EN-, DIR-, CLK-
DIR 11 17 DIR+
ENABLE 13 27 EN+
HALL (Calibrate) 21 13

qsh4218-35-10-027.jpg


WS2801

WS2801 Header Function
DI 19 MOSI Digital In
CI 23 SCLK Clock In
GND 25 GND Ground

Output settings for LEDScript

Address > 128.
Options Color, Type Macro.


WIOpi-01

The Rpi-Zero header mounted on the bottom side. (without factory header)
The Rpi-1/4 header mounted on the top side. (factory default)
Short header on the Rpi-1; No native servo support.

 --------------------  
| Rpi0 bottom hdr    |
 --------------------
 |  |
  --       Zero set top
 |  |
 |  |
 ----------------------------------------
| WIOpi-01                               |
 ----------------------------------------
 |  |                                 || 
 |  |                                 ||
  --       Pi2++ piggy bag            ||
 |  |                                 ||
 ----------------------------------------
| Rpi1/4 top hdr                         |
 ----------------------------------------



CAM

The CAM can be used parallel with WIOpi as documented here:

top - 11:54:34 up 26 min,  2 users,  load average: 1.53, 1.27, 0.85
Tasks:  77 total,   1 running,  76 sleeping,   0 stopped,   0 zombie
%Cpu(s):  7.2 us, 15.4 sy,  0.0 ni, 71.9 id,  0.0 wa,  0.0 hi,  5.5 si,  0.0 st
MiB Mem :    368.4 total,    222.4 free,     73.5 used,     72.5 buff/cache
MiB Swap:      0.0 total,      0.0 free,      0.0 used.    244.2 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                              
  527 root      20   0       0      0      0 I   8.1   0.0   0:00.48 kworker/u2:2-brcmf_wq/mmc1:0001:1                                                    
  435 pi        20   0  120260  20208   8232 S   7.8   5.4   1:56.07 python3                                                                              
  301 pi        20   0    9944   2528   2072 S   7.5   0.7   2:00.87 wiopi                                                                                
  526 root      20   0       0      0      0 I   2.9   0.0   0:00.61 kworker/0:1-events                                                                   
  521 pi        20   0   10280   2972   2516 R   1.3   0.8   0:01.73 top                                                                                  

Link to stream:

http://<zero-name>:8081


I2C Slaves

WIOpi supports up to 4 Arduino Slaves.
The reserved I2C device addresses are 0x7C, 0x7D, 0x7E and 0x7F.
The WIOnano can be used as skeleton:

To address a pin on a slave, the following parameters are involved:

  • Node ID: The ID of the WIOpi
  • Address: Pin number
  • Port: Slave I2C ID

Supported Rocrail objects:

  • Digital output

Monitor trace DOUT(0x0A) on Pin 5(data[0]) off(data[1]):

opc=0x0A dlc=5 data=05 00 00 00 7C 00 00 00


Ten times a second, the slaves are polled for their input pin state. (If any defined.)

20210105.083513.532 w9999I main     OWire    0187 I2C device found at 0x7C
20210105.083513.542 w9999I main     ODisplay 0392 init SSD1306 device 0x3C geometry=3
...
20210105.083513.886 w9999I doManage OManager 0101 read reg array slave 0x7C rc=2: opc=0x99 11 66
  • Note 1: The Arduino Nano cannot handle error free I2C speeds above the default 100kHz.


User Pin Definitions

To remap pins for Pi01, Stepper and Mobile, the following child nodes in the wiopi.ini can be used:

<wiopi server="localhost">
  <pindef fn="PWM" nr="12"/>
  <pindef fn="IN1" nr="7"/>
</wiopoi>

The nr attribute resembles the connector number, not the GPIO.

Name(fn) Description Remark
LED1 Pi01 LED1 output
LED2 Pi01 LED2 output
Button Pi01 Button input
IN1 Stepper IN1 output 3W Clock
IN2 Stepper IN2 output 3W Dir
IN3 Stepper IN3 output 3W Enable
IN4 Stepper IN4 output
CAL Stepper calibration input
PWM Mobile PWM output
FWD Mobile forwards relay pulse output
REV Mobile reverse relay pulse output
LIGHTS1 Mobile lights Cab 1 output
LIGHTS2 Mobile lights Cab 2 output


ESC

1)
Note: WIOpi must be started with sudo to be able to use the PWM outputs.
wio/wiopi-en.txt · Last modified: 2021/01/20 09:04 by rjversluis