Blog - If you Linux user this instruction help to you, for upload Arduino sketch to SAMD21 M0 board | robotdyn.com
![arduino - Problem SAMD21 : ASF4 USB CDC Echo example cdcdf_acm_write() doesn't allow to send data to usb port - Electrical Engineering Stack Exchange arduino - Problem SAMD21 : ASF4 USB CDC Echo example cdcdf_acm_write() doesn't allow to send data to usb port - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/Bp9eH.png)
arduino - Problem SAMD21 : ASF4 USB CDC Echo example cdcdf_acm_write() doesn't allow to send data to usb port - Electrical Engineering Stack Exchange
![Seeeduino XIAO The Smallest Arduino Microcontroller Based on SAMD21,100% Arduino IDE Compatible, with Rich Interfaces, Breadboard-friendly, Designed for Projects Need Arduino Micro, 1 pcs: Buy Online at Best Price in UAE - Seeeduino XIAO The Smallest Arduino Microcontroller Based on SAMD21,100% Arduino IDE Compatible, with Rich Interfaces, Breadboard-friendly, Designed for Projects Need Arduino Micro, 1 pcs: Buy Online at Best Price in UAE -](https://m.media-amazon.com/images/I/51eTkMNx95L._AC_SY350_.jpg)
Seeeduino XIAO The Smallest Arduino Microcontroller Based on SAMD21,100% Arduino IDE Compatible, with Rich Interfaces, Breadboard-friendly, Designed for Projects Need Arduino Micro, 1 pcs: Buy Online at Best Price in UAE -
Glen Akins Twitterissä: "Just ported the ASF SAMD21 USB CDC STDIO example from the Xplained Pro to the SparkFun SAMD21 mini breakout. Programmed from Atmel Studio 7 using the J-Link EDU Mini.
![Application migration from 8 bit AVR to 32 bit SAM D21 | Microchip MPLAB Harmony Quick Documentation help Application migration from 8 bit AVR to 32 bit SAM D21 | Microchip MPLAB Harmony Quick Documentation help](https://microchip-mplab-harmony.github.io/quick_docs/source/migration/atmega4809_to_samd21_migration/images/hardware.png)