why is my arduino stuck on uploading?

Question

my arduino for the playground adafruit express gets stuck uploading, and is saying that it is not recognizing the ports. <Arduino: 1.8.16 (Windows Store 1.8.51.0) (Windows 10), Board: "Adafruit Circuit Playground"

Sketch uses 6360 bytes (22%) of program storage space. Maximum is 28672 bytes.
Global variables use 351 bytes of dynamic memory.
Forcing reset using 1200bps open/close on port COM13
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
PORTS {COM13, } / {COM13, } => {}
Uploading using selected port: COM13
C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.51.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avrdude -CC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.51.0_x86__mdqgnx93n4wtt\hardware\tools\avr/etc/avrdude.conf -v -patmega32u4 -cavr109 -PCOM13 -b57600 -D -Uflash:w:C:\Users\Owner\AppData\Local\Temp\arduino_build_570140/sorting_numbers_test.ino.hex:i
avrdude: Version 6.3-20190619
     Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

     Copyright (c) 2007-2014 Joerg Wunsch



     System wide configuration file is "C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.51.0_x86__mdqgnx93n4wtt\hardware\tools\avr/etc/avrdude.conf"



     Using Port                    : COM13

     Using Programmer              : avr109

     Overriding Baud Rate          : 57600

     AVR Part                      : ATmega32U4

     Chip Erase delay              : 9000 us

     PAGEL                         : PD7

     BS2                           : PA0

     RESET disposition             : dedicated

     RETRY pulse                   : SCK

     serial program mode           : yes

     parallel program mode         : yes

     Timeout                       : 200

     StabDelay                     : 100

     CmdexeDelay                   : 25

     SyncLoops                     : 32

     ByteDelay                     : 0

     PollIndex                     : 3

     PollValue                     : 0x53

     Memory Detail                 :



                              Block Poll               Page                       Polled

       Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack

       ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------

       eeprom        65    20     4    0 no       1024    4      0  9000  9000 0x00 0x00

       flash         65     6   128    0 yes     32768  128    256  4500  4500 0x00 0x00

       lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

       hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

       efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

       lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

       calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00

       signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00



     Programmer Type : butterfly

     Description     : Atmel AppNote AVR109 Boot Loader




Connecting to programmer: .avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
Found programmer: Id = "F"; type = @
Software Version = �.v; Hardware Version = �. 


avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: error: buffered memory access not supported. Maybe it isn't
a butterfly/AVR109 but a AVR910 device?
avrdude: initialization failed, rc=-1
     Double check connections and try again, or use -F to override

     this check.




avrdude: butterfly_recv(): programmer is not responding
avrdude: error: programmer did not respond to command: leave prog mode
avrdude: butterfly_recv(): programmer is not responding
avrdude: error: programmer did not respond to command: exit bootloader
avrdude done.  Thank you.
the selected serial port
does not exist or your board is not connected
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.>

Answer 1

• ...for the playground adafruit express gets stuck...

• avrdude: initialization failed, rc=-1

You appear to have selected the "Classic" rather than "Express" version of the board, which are different things.

• The classic you have selected uses an AVR ATMega32u4 like you'd find in the Arduino Micro/Leonardo.

• The "Express" uses an ATSAMD21 chip like an Arduino Zero.

They don't use the same family of microcontroller, bootloader, bootloader protocol, or upload tool. The boards manager package that supports the Class board is completely different from the one that supports the Express board; they are divided support along the lines of the AVR (8-bit) vs SAMD (32-bit arm) chips.

In short, choose the "Express" version of the board after you've gone through setup process for the Express. If you have problems uploading to an Express with the Express board selected, you're likely to see errors that mention bossac, but you're not going to see anything about avrdude.