Send a simple sentence from the MCU to the browser on laptop.
Start the web browser code with make server.
Ensure the browser side of the code is also implemented with serial.js.
<button id="connect">Connect to device</button>
<p>Open the browser console to see received messages from the MCU!</p>
<!-- serial.js
From https://github.com/webusb/arduino/blob/gh-pages/demos/serial.js
Add 'vendorId': 0x2341 and 0x2a03 in line 27 and line 28
-->
<script src="serial.js"></script>
<script>
serial.requestPort = function() {
const filters = [
{ 'vendorId': 0x2341 },
{ 'vendorId': 0x2a03 }
];
return navigator.usb.requestDevice({ 'filters': filters }).then(
device => new serial.Port(device)
);
}
var port
let connectButton = document.querySelector('#connect')
let textDecoder = new TextDecoder()
connectButton.addEventListener('click', function() {
if (port) { // If port is already connected, disconnect it
connectButton.textContent = 'Connect'
port.disconnect()
port = null
console.log('Device is disconnected.')
} else { // If there is no port, then connect to a new port
serial.requestPort().then(selectedPort => {
port = selectedPort
port.connect().then(() => {
console.log('Device is connected to Product ID: ' + port.device_.productId.toString(16) + ' and Vendor ID: ' + port.device_.vendorId.toString(16))
connectButton.textContent = 'Disconnect'
port.onReceive = data => { console.log(textDecoder.decode(data))}
port.onReceiveError = error => { console.log('Receive error: ' + error)}
}, error => { console.log('Connection error: ' + error) })
}).catch(error => { console.log('Connection error: ' + error) })
}
})
</script>#include <WebUSB.h>
// Modified from example https://webusb.github.io/arduino/demos/console
WebUSB WebUSBSerial(1, "webusb.github.io/arduino/demos/console");
uint16_t irCode[4] = {3446, 1716, 416, 1310};
void setup() {
WebUSBSerial.begin(9600);
while (!WebUSBSerial) {}
delay(100);
}
void loop() {
WebUSBSerial.write("Hello world to the browser!");
WebUSBSerial.flush();
writeWebUSB((const uint8_t *)irCode, 8);
delay(2000);
}
void writeWebUSB(const uint8_t *buffer, int size) {
WebUSBSerial.write((const uint8_t *)buffer, size);
WebUSBSerial.flush();
}BOARD?=arduino:samd:arduino_zero_native
PORT := $(shell ls /dev/cu.usbmodem*)
.PHONY: default lint all flash clean
default: lint all flash clean
lint:
cpplint --extensions=ino --filter=-legal/copyright,-whitespace/line_length,-readability/casting,-readability/todo *.ino
all:
# This custom PCB does not have a crytal on pins PA00 and PA01
# Hence, use -DCRYSTALLESS to replace the extra_flags in boards.txt
arduino-cli compile --fqbn $(BOARD) --build-properties build.extra_flags="-DCRYSTALLESS -D__SAMD21G18A__ {build.usb_flags}" ./
flash:
arduino-cli upload -p $(PORT) --fqbn $(BOARD)
clean:
rm -r build
server:
echo "Open Chrome browser at http://localhost:8000/webusb-send.html"
python -m SimpleHTTPServer 8000