Programming with the QUTy Development Board

The QUTy development board supports two modes through its USB-C interface:

• Programming through the Unified Program and Debug Interface (UPDI)
• Serial communication through the Universal Asynchronous Receiver/Transmitter (UART)

UPDI is used for programming and debugging the ATtiny1626 microcontroller. It allows direct access to SRAM, registers, flash, EEPROM, USERROW, SIGROW, and other fuses.

UART facilitates serial communication between the QUTy board and a host machine, enabling data exchange during program execution.

Tables of Contents

1. Programming through UPDI
   1. Uploading Firmware using PlatformIO
   2. Uploading Firmware using pymcuprog
2. Serial Communication through UART

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Programming through UPDI

Upon successfully building a project using PlatformIO, the QUTy platform emits a firmware.hex file to the .pio/build/QUTy/ directory. This file can be uploaded to the ATtiny1626 using the UPDI interface on the QUTy board.

This can be done in one of two ways:

• Using the PlatformIO interface
• Using the pymcuprog utility

Uploading Firmware using PlatformIO

1. Connect the QUTy board to the host machine using a USB-C cable.
2. Place the slide switch S6 on the QUTy board in the UPDI position (left).
3. Upload the firmware using the PlatformIO interface.

A successful upload will result in the following output:

Configuring upload protocol...
AVAILABLE: updi
CURRENT: upload_protocol = updi
Looking for upload port...
Auto-detected: COM3
Forcing reset using 1200bps open/close on port COM3
Uploading .pio/build/QUTy/firmware.hex
Connecting to SerialUPDI
Pinging device...
Ping response: 1E9429
Erasing device before writing from hex file...
Writing from hex file...
Writing flash...
Done.
======================= [SUCCESS] Took x seconds =======================

Uploading Firmware using pymcuprog

1. Connect the QUTy board to the host machine using a USB-C cable.
2. Place the slide switch S6 on the QUTy board in the UPDI position (left).

3. Execute the following command to erase the device:

   # pymcuprog erase -t uart -u <device-port> -d attiny1626
   

   A successful erase will result in the following output:

   Connecting to SerialUPDI
   Pinging device...
   Ping response: 1E9429
   Chip/Bulk erase:
   - Memory type eeprom is conditionally erased (depending upon EESAVE fuse setting)
   - Memory type flash is always erased
   - Memory type lockbits is always erased
   Erased.
   Done.
   

4. Execute the following command to upload the firmware:

   # pymcuprog write -t uart -u <device-port> -d attiny1626 -f .pio/build/QUTy/firmware.hex
   

   A successful upload will result in the following output:

   Connecting to SerialUPDI
   Pinging device...
   Ping response: 1E9429
   Writing from hex file...
   Writing flash...
   Done.
   

Serial Communication through UART

Ensure firmware has been uploaded to the QUTy board before reading this section.

To allow serial communication between the QUTy board and the host machine:

1. Connect the QUTy board to the host machine using a USB-C cable.
2. Place the slide switch S6 on the QUTy board in the UART position (right).

3. Open the serial monitor in PlatformIO or use a serial terminal program to communicate with the QUTy board, ensuring the UART protocol is configured appropriately. By default, the ATtiny1626 uses 9600—8N1:

   • Baud rate: 9600 bps
   • Data bits: 8 bits
   • Parity: None
   • Stop bits: 1 bit
4. Restart the QUTy board using pushbutton S5 to restart program execution, allowing transmitted data to be received by the host machine.