If you need to test your embedded hardware remotely, this tool sends remote mouse clicks from your web-browser
Raspberry Pi as 'heart' of whole system, and custom cap with few ATTiny8 chips works as vitrual mouse (or touchscreen/keyboard/etc).
RPi sends commands to ATTiny via i2c bus and can use SPI bus as AVR programmer, toggles switches using optocouplers.
From another side, RPi connects to MQTT broker and subscribes for topics with encoded mouse clicks. In 'web' folder I put small example how to send mouse clicks directly from web-page.
Description of MQTT channels, screen resolutions and coordinates. All RPi and console scripts read this file on start and use as common point to establish links. File format, JSON:
{
"MQTT": {
"addr" : "10.11.12.1",
"port" : 1883,
"login" : "rpi",
"password" : "123"
},
"Shelf": [
{
"name" : "FirstDev",
"screen" : {
"xsize" : 1024,
"ysize" : 768
},
"remote" : {
"X0" : 234,
"Y0" : 12,
"X1" : 555,
"Y1" : 200
}
},
{
"name" : "AnotherDev",
"screen" : {
"xsize" : 800,
"ysize" : 600
}
}
],
"HID": [
{
"name" : "FirstDev",
"device" : "rpi1",
"topic" : "/aaa/bbb/1",
"port" : 38
},
{
"name" : "AnotherDev",
"device" : "rpi1",
"topic" : "/aaa/ccc/1",
"port" : 40
}
]
}
Topic (defined in config) - for HID number;
Message in format "XXX,YYY,B" (three comma-separated digits without spaces)
Byte1 - Magic number indicating packet start. Arduino library doesn't support start/stop indication between bytes.
Byte2, Byte3, Byte4 - X and Y coordinates 12 bits long
Byte5 - button state [xxxxxRML] (R- right, M- middle, L- left)
Based on ATTiny85 chip, possible to use Digispark Arduino board as prototype:
VUSB library as USB HID
SDA - pin1
SCL - pin3
LED - pin2
Possible to reconfigure HID profiles on working equipment. (Touch Screen, Joystick, Keyboard, Mouse etc)
VUSB library as USB HID
SDA - pin1
SCL - pin3
LED - pin2
Possible to reconfigure HID profiles on working equipment. (Touch Screen, Joystick, Keyboard, Mouse etc)
Based on instructions and this one
Install avrdude programmer:
sudo apt install avrdude
configure programmer in avrdude config file:
programmer
id = "pi_hid1";
desc = "Bitbang GPIO lines for first HID";
type = "linuxgpio";
reset = 24;
sck = 3;
mosi = 2;
miso = 23;
;
programmer
id = "pi_hid2";
desc = "Bitbang GPIO lines for second HID";
type = "linuxgpio";
reset = xx; <- next value
sck = 3;
mosi = 2;
miso = xx; <- too
;
....
All chips have common SCK and MOSI pins (the same with SCL and SDA for I2C communication) and individual MISO and RESET
Check chip connection:
avrdude -C hids_gpio.conf -p attiny85 -c pi_hid1 -v
It should respond with fuse state and "avrdude: AVR device initialized and ready to accept instructions"
Writing procedure:
avrdude -C hids_gpio.conf -p attiny85 -c pi_hid1 -v -U flash:w:firmware.hex
Some pins in GPIO config shared with i2c bus. To resolve conflicts remove i2c module before programming:
rmmod i2c_bcm2835
and install it back after programming:
modprobe i2c_bcm2835
Just edit the Digispark's platform.txt file and add this:
## Create hex
....
## Save hex
recipe.output.tmp_file={build.project_name}.hex
recipe.output.save_file={build.project_name}.hex
Install AVR-gcc
sudo apt install avr-libc gcc-avr
Supports 3 buttons and range 0..4095 for X and Y axis.
const PROGMEM unsigned char mouse_usbHidReportDescriptor[] = { /* USB report descriptor */
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x02, // Usage (Mouse)
0xA1, 0x01, // Collection (Application)
0x09, 0x01, // Usage (Pointer)
0xA1, 0x00, // Collection (Physical)
0x05, 0x09, // Usage Page (Button)
0x19, 0x01, // Usage Minimum (0x01)
0x29, 0x03, // Usage Maximum (0x03)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x95, 0x03, // Report Count (3)
0x75, 0x01, // Report Size (1)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x01, // Report Count (1)
0x75, 0x05, // Report Size (5)
0x81, 0x01, // Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x30, // Usage (X)
0x09, 0x31, // Usage (Y)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x0F, // Logical Maximum (4095)
0x75, 0x0C, // Report Size (12)
0x95, 0x02, // Report Count (2)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0, // End Collection
0xC0, // End Collection
};
Define screen shapes and coordinates, convert point on screen to HID coordinates inside pre-defined topic;
Use JS to convert on-screen mouse clicks into MQTT messages:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Demo</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/paho-mqtt/1.0.1/mqttws31.min.js" type="text/javascript">
</script>
<style>
#demo-box {
width: 200px;
height: 200px;
border: 1px solid powderblue;}
</style>
<script type = "text/javascript" language="javascript">
// Create MQTT connection
var mqtt;
var reconn=2000;
var host="localhost";
var port=9001;
function onConnect() {
console.log("Connected");
}
function MQTTconnect() {
mqtt = new Paho.MQTT.Client(host,port,"clientjs");
var options = {
timeout: 3,
onSuccess: onConnect,
};
console.log("Connecting");
mqtt.connect(options);
}
</script>
</head>
<body onload="MQTTconnect()">
<script src="http://code.jquery.com/jquery-latest.min.js"
type="text/javascript"></script>
HID event sender example
<div id="demo-box"></div>
<script type="text/javascript">
$(function() {
$("#demo-box").click(function(e) {
var offset = $(this).offset();
var relativeX = (e.pageX - offset.left);
var relativeY = (e.pageY - offset.top);
// Sending click coordinate
msg = new Paho.MQTT.Message(relativeX+","+relativeY+",1");
msg.destinationName = "/aaa/bbb/1";
console.log("Msg "+relativeX + " , " +relativeY);
mqtt.send(msg);
// Release mouse button
msg = new Paho.MQTT.Message(relativeX+","+relativeY+",0");
msg.destinationName = "/aaa/bbb/1";
mqtt.send(msg);
});
});
</script>
</body>
</html>JS script requires WebSocket connection to MQTT broker. You need to make changes in the mosquitto.conf file, by adding the following:
listener 9001
protocol websockets
Enable UART in boot config:
vi /boot/config.txt
insert after last line:
enable_uart=1
Connect UART-to-USB dongle with ribbon cable:
sudo apt-get install libkmod-dev
sudo pip install kmod