The Feather/Metro/Gemma/Trinket M0 and M4 use an ATSAMD21 or ATSAMD51 chip, and you can pretty easily get it working with the Arduino IDE. Most libraries (including the popular ones like NeoPixels and display) will work with the M0 and M4, especially devices & sensors that use I2C or SPI.
Now that you have added the appropriate URLs to the Arduino IDE preferences in the previous page, you can open the Boards Manager by navigating to the Tools->Board menu.
Once the Board Manager opens, click on the category drop down menu on the top left hand side of the window and select All. You will then be able to select and install the boards supplied by the URLs added to the preferences.
Install SAMD Support
First up, install the latest Arduino SAMD Boards (version 1.6.11 or later)
You can type Arduino SAMD in the top search bar, then when you see the entry, click Install
Install Adafruit SAMD
Next you can install the Adafruit SAMD package to add the board file definitions
Make sure you have Type All selected to the left of the Filter your search... box
You can type Adafruit SAMD in the top search bar, then when you see the entry, click Install
Even though in theory you don't need to - I recommend rebooting the IDE
Quit and reopen the Arduino IDE to ensure that all of the boards are properly installed. You should now be able to select and upload to the new boards listed in the Tools->Board menu.
Select the matching board, the current options are:
- Feather M0 (for use with any Feather M0 other than the Express)
- Feather M0 Express
- Metro M0 Express
- Circuit Playground Express
- Gemma M0
- Trinket M0
- ItsyBitsy M0
- Hallowing M0
- Crickit M0 (this is for direct programming of the Crickit, which is probably not what you want! For advanced hacking only)
- Metro M4 Express
- ItsyBitsy M4 Express
- Feather M4 Express
- Trellis M4 Express
- Grand Central M4 Express
Install Drivers (Windows 7 & 8 Only)
When you plug in the board, you'll need to possibly install a driver
Click below to download our Driver Installer
Download and run the installer
Run the installer! Since we bundle the SiLabs and FTDI drivers as well, you'll need to click through the license
Select which drivers you want to install, the defaults will set you up with just about every Adafruit board!
Click Install to do the installin'
Blink
Now you can upload your first blink sketch!
Plug in the M0 or M4 board, and wait for it to be recognized by the OS (just takes a few seconds). It will create a serial/COM port, you can now select it from the drop-down, it'll even be 'indicated' as Trinket/Gemma/Metro/Feather/ItsyBitsy/Trellis!
Now load up the Blink example
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin 13 as an output.
pinMode(13, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
And click upload! That's it, you will be able to see the LED blink rate change as you adapt the delay() calls.
If you're using Trellis M4 Express, you can go to the next page cause there's no pin 13 LED - so you won't see it blink. Still this is a good thing to test compile and upload!
Successful Upload
If you have a successful upload, you'll get a bunch of red text that tells you that the device was found and it was programmed, verified & reset
After uploading, you may see a message saying "Disk Not Ejected Properly" about the ...BOOT drive. You can ignore that message: it's an artifact of how the bootloader and uploading work.
Compilation Issues
If you get an alert that looks like
Cannot run program "{runtime.tools.arm-none-eabi-gcc.path}\bin\arm-non-eabi-g++"
Make sure you have installed the Arduino SAMD boards package, you need both Arduino & Adafruit SAMD board packages
Manually bootloading
If you ever get in a 'weird' spot with the bootloader, or you have uploaded code that crashes and doesn't auto-reboot into the bootloader, click the RST button twice (like a double-click)to get back into the bootloader.
The red LED will pulse, so you know that its in bootloader mode.
Once it is in bootloader mode, you can select the newly created COM/Serial port and re-try uploading.
You may need to go back and reselect the 'normal' USB serial port next time you want to use the normal upload.
Ubuntu & Linux Issue Fix
Follow the steps for installing Adafruit's udev rules on this page.
