How does Teensy tell what device to connect to USB?

How does Teensy tell what device to connect to USB?

When programs do use USB, type of device Teensy becomes depends on the code you have loaded. Your computer will see a new USB device connect when your program begin using the USB port. In Arduino, the device type is controlled by the Tools > USB Type menu. In C language, the USB code you use determine the type of device.

Do you need Teensy library for capacitive touch?

Teensy LC, 3.0, 3.1, 3.2 & 3.6 have superior hardware-based capacitive touch sensing circuitry on specific pins. They do not require this library. To read capacitance on those pins, simply use touchRead (pin).

What causes the led to stop blinking on Teensy?

No software or drivers on your computer are necessary for the button to stop the LED blink. When the LED blinks and the pushbutton causes the blinking to stop, this is a very good indication your Teensy hardware is functioning properly. When the LED stops blinking, if the Teensy Loader program is running, it should detect the Teensy board.

Why does Teensy loader not detect my Linux board?

On Linux, the udev rule file must be installed. If the LED blinks, and the pushbutton stops the blinking, but Teensy Loader never detects your board, and you’ve followed the steps above, the problem is almost certainly a faulty USB cable. Many USB cables made for charging devices have only power wires but no data lines.

How can this be done using a modern Teensy?

How can this be done using a modern Teensy (i.e. 3.6 or 4.0) if at all? All Teensies support digitalWriteFast out of the box. digitalWriteFast compiles to just setting the bit in the right port register. You can not do that faster by direct register manipulation.

What happens when I Disconnect Teensy from my computer?

Experience troubleshooting Arduino does not apply to Teensy! During programming, Teensy appears as a HID device . When Teensy reboots, electrically your computer sees Teensy disconnect, as if the cable were physically unplugged. When Teensy begins running your program, the USB is disconnected.

How does serial.print ( ) work on a teensy?

The UART buffers 2 bytes, so Serial.print () will return when all but the last 2 bytes have been sent to the FTDI converter chip, which in turn stores the bytes into its own USB buffer. On a Teensy, Serial.print () writes directly into the USB buffer.