Adafruit Feather M0 Express - Designed for CircuitPython Created by lady ada

Last updated on 2021-09-28 05:35:24 PM EDT Guide Contents

Guide Contents 2 Overview 9 Pinouts 12 Power Pins 12 Logic pins 13 SPI Flash and NeoPixel 14 Other Pins! 15 Debug Interface 15 Assembly 17 Header Options! 17 Soldering in Plain Headers 20 Prepare the header strip: 20 Add the breakout board: 21 And Solder! 21 Soldering on Female Header 23 Tape In Place 23 Flip & Tack Solder 24 And Solder! 25 Power Management 27 Battery + USB Power 27 Power supplies 28 Measuring Battery 28 ENable pin 30 Alternative Power Options 30 Arduino IDE Setup 32 https://adafruit.github.io/arduino-board-index/package_adafruit_index.json 33 Using with Arduino IDE 35 Install SAMD Support 35 Install Adafruit SAMD 36 Install Drivers (Windows 7 & 8 Only) 37 Blink 39 Successful Upload 40 Compilation Issues 41 Manually bootloading 41 Ubuntu & Linux Issue Fix 42 Adapting Sketches to M0 & M4 43 Analog References 43 Pin Outputs & Pullups 43 Serial vs SerialUSB 43 AnalogWrite / PWM on Feather/Metro M0 44 analogWrite() PWM range 45 analogWrite() DAC on A0 45 Missing header files 45 Bootloader Launching 46 Aligned Memory Access 46

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python- © Adafruit Industries Page 2 of 255 circuitpython Floating Point Conversion 46 How Much RAM Available? 47 Storing data in FLASH 47 Pretty-Printing out registers 47 M4 Performance Options 48 CPU Speed (overclocking) 48 Optimize 49 Cache 49 Max SPI and Max QSPI 49 Enabling the Buck Converter on some M4 Boards 50 Using SPI Flash 51 Read & Write CircuitPython Files 52 Format Flash Memory 54 Datalogging Example 55 Reading and Printing Files 55 Full Usage Example 56 Accessing SPI Flash 56 Feather HELP! 58 My ItsyBitsy/Feather stopped working when I unplugged the USB! 58 My Feather never shows up as a COM or Serial port in the Arduino IDE 59 Ack! I "did something" and now when I plug in the Itsy/Feather, it doesn't show up as a device anymore so I cant upload to it or fix it... 60 I can't get the Itsy/Feather USB device to show up - I get "USB Device Malfunctioning" errors! 61 I'm having problems with COM ports and my Itsy/Feather 32u4/M0 62 I don't understand why the COM port disappears, this does not happen on my Arduino UNO! 63 I'm trying to upload to my 32u4, getting "avrdude: butterfly_recv(): programmer is not responding" errors 64 I'm trying to upload to my Feather M0, and I get this error "Connecting to programmer: .avrdude: butterfly_recv(): programmer is not responding" 66 I'm trying to upload to my Feather and i get this error "avrdude: ser_recv(): programmer is not responding" 67 I attached some wings to my Feather and now I can't read the battery voltage! 68 The yellow LED Is flickering on my Feather, but no battery is plugged in, why is that? 69 What is CircuitPython? 71 CircuitPython is based on Python 71 Why would I use CircuitPython? 71 CircuitPython 73 Set up CircuitPython Quick Start! 73 Further Information 75 Installing Mu Editor 76 Download and Install Mu 76 Using Mu 76 Creating and Editing Code 78 Creating Code 78 Editing Code 80 Your code changes are run as soon as the file is done saving. 81 1. Use an editor that writes out the file completely when you save it. 81 2. Eject or Sync the Drive After Writing 82 Oh No I Did Something Wrong and Now The CIRCUITPY Drive Doesn't Show Up!!! 82 Back to Editing Code... 83 Exploring Your First CircuitPython Program 84 Imports & Libraries 84 Setting Up The LED 84

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python- © Adafruit Industries Page 3 of 255 circuitpython Loop-de-loops 85 What Happens When My Code Finishes Running? 85 What if I don't have the loop? 86 More Changes 87 Naming Your Program File 87 Connecting to the Serial Console 88 Are you using Mu? 88 Setting Permissions on Linux 89 Using Something Else? 90 Interacting with the Serial Console 91 The REPL 95 Returning to the serial console 98 CircuitPython Libraries 99 Installing the CircuitPython Library Bundle 100 Example Files 101 Copying Libraries to Your Board 102 Example: ImportError Due to Missing Library 102 Library Install on Non-Express Boards 103 Updating CircuitPython Libraries/Examples 104 Frequently Asked Questions 105 I have to continue using an older version of CircuitPython; where can I find compatible libraries? 105 Is ESP8266 or ESP32 supported in CircuitPython? Why not? 105 How do I connect to the Internet with CircuitPython? 106 Is there asyncio support in CircuitPython? 107 My RGB NeoPixel/DotStar LED is blinking funny colors - what does it mean? 108 What is a MemoryError? 109 What do I do when I encounter a MemoryError? 109 Can the order of my import statements affect memory? 110 How can I create my own .mpy files? 110 How do I check how much memory I have free? 110 Does CircuitPython support interrupts? 110 Does Feather M0 support WINC1500? 111 Can AVRs such as ATmega328 or ATmega2560 run CircuitPython? 111 Commonly Used Acronyms 111 Troubleshooting 112 Always Run the Latest Version of CircuitPython and Libraries 112 I have to continue using CircuitPython 5.x, 4.x, 3.x or 2.x, where can I find compatible libraries? 112 CPLAYBOOT, TRINKETBOOT, FEATHERBOOT, or GEMMABOOT Drive Not Present 112 You may have a different board. 113 MakeCode 113 MacOS 113 Windows 10 113 Windows 7 or 8.1 113 Windows Explorer Locks Up When Accessing boardnameBOOT Drive 114 Copying UF2 to boardnameBOOT Drive Hangs at 0% Copied 115 CIRCUITPY Drive Does Not Appear 115 Device Errors or Problems on Windows 115 Serial Console in Mu Not Displaying Anything 116 CircuitPython RGB Status Light 116

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python- © Adafruit Industries Page 4 of 255 circuitpython ValueError: Incompatible .mpy file. 117 CIRCUITPY Drive Issues 118 Easiest Way: Use storage.erase_filesystem() 118 Old Way: For the Circuit Playground Express, Feather M0 Express, and Metro M0 Express: 118 Old Way: For Non-Express Boards with a UF2 bootloader (Gemma M0, Trinket M0): 120 Old Way: For non-Express Boards without a UF2 bootloader (Feather M0 Basic Proto, Feather Adalogger, Arduino Zero): 120 Running Out of File Space on Non-Express Boards 121 Delete something! 121 Use tabs 121 MacOS loves to add extra files. 121 Prevent & Remove MacOS Hidden Files 122 Copy Files on MacOS Without Creating Hidden Files 122 Other MacOS Space-Saving Tips 123 Device locked up or boot looping 124 Uninstalling CircuitPython 126 Backup Your Code 126 Moving Circuit Playground Express to MakeCode 126 Moving to Arduino 127 Welcome to the Community! 130 Adafruit Discord 130 Adafruit Forums 131 Adafruit Github 132 ReadTheDocs 133 CircuitPython Essentials 135 CircuitPython Pins and Modules 136 CircuitPython Pins 136 import board 136 I2C, SPI, and UART 137 What Are All the Available Names? 138 Microcontroller Pin Names 139 CircuitPython Built-In Modules 140 CircuitPython Built-Ins 141 Thing That Are Built In and Work 141 Flow Control 141 Math 141 Tuples, Lists, Arrays, and Dictionaries 141 Classes, Objects and Functions 141 Lambdas 141 Random Numbers 142 CircuitPython Digital In & Out 143 Find the pins! 144 Read the Docs 146 CircuitPython Analog In 147 Creating the analog input 147 get_voltage Helper 147 Main Loop 147 Changing It Up 148 Wire it up 148 Reading Analog Pin Values 151 CircuitPython Analog Out 152 Creating an analog output 152

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python- © Adafruit Industries Page 5 of 255 circuitpython Setting the analog output 152 Main Loop 152 Find the pin 153 CircuitPython PWM 157 PWM with Fixed Frequency 157 Create a PWM Output 158 Main Loop 158 PWM Output with Variable Frequency 159 Wire it up 160 Where's My PWM? 164 CircuitPython Servo 166 Servo Wiring 166 Standard Servo Code 169 Continuous Servo Code 169 CircuitPython Cap Touch 171 Create the Touch Input 171 Main Loop 171 Find the Pin(s) 172 CircuitPython Internal RGB LED 176 Create the LED 177 Brightness 177 Main Loop 177 Making Rainbows (Because Who Doesn't Love 'Em!) 178 Circuit Playground Express Rainbow 179 CircuitPython NeoPixel 181 Wiring It Up 181 The Code 182 Create the LED 183 NeoPixel Helpers 184 Main Loop 184 NeoPixel RGBW 184 Read the Docs 186 CircuitPython DotStar 187 Wire It Up 187 The Code 188 Create the LED 190 DotStar Helpers 191 Main Loop 191 Is it SPI? 192 Read the Docs 192 CircuitPython UART Serial 194 The Code 195 Wire It Up 196 Where's my UART? 199 Trinket M0: Create UART before I2C 200 CircuitPython I2C 202 Wire It Up 202 Find Your Sensor 205 I2C Sensor Data 206 Where's my I2C? 207 CircuitPython HID Keyboard and Mouse 209 CircuitPython Keyboard Emulator 209 Create the Objects and Variables 211 The Main Loop 211

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python- © Adafruit Industries Page 6 of 255 circuitpython CircuitPython Mouse Emulator 211 Create the Objects and Variables 214 CircuitPython HID Mouse Helpers 214 Main Loop 214 CircuitPython CPU Temp 216 CircuitPython Storage 217 Logging the Temperature 219 CircuitPython Expectations 222 Always Run the Latest Version of CircuitPython and Libraries 222 I have to continue using CircuitPython 3.x or 2.x, where can I find compatible libraries? 222 Switching Between CircuitPython and Arduino 222 The Difference Between Express And Non-Express Boards 223 Non-Express Boards: Gemma, Trinket, and QT Py 223 Small Disk Space 223 No Audio or NVM 223 Differences Between CircuitPython and MicroPython 223 Differences Between CircuitPython and Python 224 Python Libraries 224 Integers in CircuitPython 224 Floating Point Numbers and Digits of Precision for Floats in CircuitPython 224 Differences between MicroPython and Python 224 MakeCode 225 What is MakeCode Maker? 226 How is it related to makecode.adafruit.com ? 226 Is it open source? 227 Editing Blocks 230 Blinky! 230 Editing JavaScript 232 Blocks to JavaScript 232 Downloading and Flashing 233 Step 1: Connect your board via USB 233 Step 2: Test your code in the simulator 233 Step 3: Download and flash your code 234 General Steps to copy over your program (not specific to any Operating system) 234 Saving and Sharing 235 Extracting your code from the board 235 Sharing 235 Custom Extensions 236 Account setup 236 Commit and push 237 Conflicts 238 Testing your package 239 UF2 Bootloader Details 241 Entering Bootloader Mode 242 Using the Mass Storage Bootloader 244 Using the BOSSA Bootloader 245 Windows 7 Drivers 245 Verifying Serial Port in Device Manager 246 Running bossac on the command line 248 Using bossac Versions 1.7.0, 1.8 248 Using bossac Versions 1.9 or Later 248

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python- © Adafruit Industries Page 7 of 255 circuitpython Updating the bootloader 249 Getting Rid of Windows Pop-ups 250 Making your own UF2 251 Installing the bootloader on a fresh/bricked board 252 Downloads 253 Datasheets 253 Firmware 253 Schematic & Fabrication Print 253

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