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Raspberry Pi Pico

Can be programmed several ways.

MicroPython

If minicom is not available (like on a Mac), use screen.

  • Start the Pico, with the button pushed
  • Drag the pico_micropyhton_20210121.uf2 on the Pico's "drive"
  • A Serial new port should be available when the copy is done.

From a Mac

The port for the Raspberry Pi Pico could be like /dev/tty.usbmodem0000000000001.

$ screen /dev/tty.usbmodem0000000000001 9600
>>>

Other baud rates work too (like 115200)

Hit [Return] if needed to get to the prompt.
Type [Ctrl+D] at the prompt:

>>> 
MPY: soft reboot
MicroPython v1.13-290-g556ae7914 on 2021-01-21; Raspberry Pi Pico with RP2040
Type "help()" for more information.
>>>

Then try help(), and this kind of things, you are in a Python REPL.
Good!
Try that:

>>> from machine import Pin
>>> led = Pin(25, Pin.OUT)
>>> led.value(1)
>>> led.value(0)

To exit screen, do a [Ctrl-a] then d.

From a Raspberry Pi

Using Thonny

  • Good resource

  • Plug in your Raspberry Pi Pico to the Raspberry Pi, holding down the BOOTSEL button

  • Then Open Thonny

    • In the Menu Run > Select Interpreter, select MicroPython (Raspnberry Pi Pico).
    • Not mandatory but useful: View > Files

Other option

You will need minicom:

$ sudo apt install minicom

then (with the Pico connected, probably on /dev/ttyACM0)

$ minicom -o -D /dev/ttyACM0 [-b 115200]
Welcome to minicom 2.7.1

OPTIONS: I18n 
Compiled on Aug 13 2017, 15:25:34.
Port /dev/ttyACM0, 16:58:34

Press CTRL-A Z for help on special keys


>>>

Hit [Return] if needed to get to the prompt.
Then, just like above, try that:

>>> from machine import Pin
>>> led = Pin(25, Pin.OUT)
>>> led.value(1)
>>> led.value(0)

To exit minicom, do a [Ctrl-A] then X.

To flash a Python script on the Pico

  • Use rshell (pip3 install rshell)
$ rshell -p /dev/tty.usbmodem0000000000001 --buffer-size 512 [or more, like 1024]
Using buffer-size of 512
Connecting to /dev/tty.usbmodem0000000000001 (buffer-size 512)...
Trying to connect to REPL  connected
Testing if ubinascii.unhexlify exists ... Y
Retrieving root directories ... 
Setting time ... Jan 26, 2021 08:43:23
Evaluating board_name ... pyboard
Retrieving time epoch ... Jan 01, 1970
Welcome to rshell. Use Control-D (or the exit command) to exit rshell.
/Users/olivierlediouris/repos/small-boards/RaspberryPi-Pico/MicroPython> ls /pyboard
/Users/olivierlediouris/repos/small-boards/RaspberryPi-Pico/MicroPython> cp ./basic_101.py /pyboard/main.py
/Users/olivierlediouris/repos/small-boards/RaspberryPi-Pico/MicroPython>

The command above was done from a Mac, hence the port name /dev/tty.usbmodem0000000000001. From a Raspberry Pi, that would be like /dev/ttyACM0, from Windows, like COM4, etc.

Notice that the file at the root of the board (in pyboard) must be named main.py.

After doing the command above, unplug and re-plug the power of the Pico, and the script should start (in this case, the led is blinking forever).

Executing a Python script from the REPL

  • Use rshell to copy your script:
cp log_temp.py /pyboard
  • In screen or minicom, run it like this
>>> exec(open("log_temp.py").read())

A Note: MicroPython and the Pico Pins

in a code like that one:

from machine import UART, Pin

TX_PIN=16   # Pin(16) = GP16, pin #21. Green wire
RX_PIN=17   # Pin(17) = GP17, pin #22. White wire
BAUD_RATE=9600

uart = UART(0, baudrate=BAUD_RATE, tx=Pin(TX_PIN), rx=Pi(RX_PIN), bits=8, parity=None, stop=1)
. . .

the pin number used in Pin(16) refers to the pin labeled GP16 in the Raspberry Pi Pico pinout:

Raspberry Pi Pico pinout

this is the pin #21.

CircuitPython

. . . TODO, flesh it out.

C/C++

Unlike with Python - that has a REPL (Read Execute Print Loop), when you write a C program for the Pico, you compile it (as indicated in the doc and examples, with make -j4) into a uf2 file, which you will flash the Pico with.

. . .

dmesg | tail
[  303.217316] scsi host0: usb-storage 1-1.3:1.0
[  304.264015] scsi 0:0:0:0: Direct-Access     RPI      RP2              1    PQ: 0 ANSI: 2
[  304.265615] sd 0:0:0:0: [sda] 262144 512-byte logical blocks: (134 MB/128 MiB)
[  304.268088] sd 0:0:0:0: [sda] Write Protect is off
[  304.268104] sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00
[  304.270537] sd 0:0:0:0: [sda] No Caching mode page found
[  304.270551] sd 0:0:0:0: [sda] Assuming drive cache: write through
[  304.282139]  sda: sda1
[  304.288549] sd 0:0:0:0: [sda] Attached SCSI removable disk
[  304.295181] sd 0:0:0:0: Attached scsi generic sg0 type 0
pi@raspberrypi4:~/pico/pico-examples/build/blink $ sudo mkdir -p /mnt/pico
pi@raspberrypi4:~/pico/pico-examples/build/blink $ sudo mount /dev/sda1 /mnt/pico
pi@raspberrypi4:~/pico/pico-examples/build/blink $ ls /mnt/pico
INDEX.HTM  INFO_UF2.TXT
pi@raspberrypi4:~/pico/pico-examples/build/blink $ sudo cp blink.uf2 /mnt/pico
pi@raspberrypi4:~/pico/pico-examples/build/blink $ sudo sync
pi@raspberrypi4:~/pico/pico-examples/build/blink $ ls /mnt/pico
pi@raspberrypi4:~/pico/pico-examples/build/blink $ sudo umount /mnt/pico