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The correct power-on sequence for obtaining the battery percentage is to first power on the PicoCalc with the battery inserted Then connect the USB Type-C cable to read the battery percentage. The battery percentage also can be retrieved via I2C communication within the UF2 program. PicoCalc keyboard firmware updating required.
PicoCalc Hello World
Demonstrate how to use spi screen, i2c keyboard and psram on PicoCalc.
Building
mkdir build
cd build
export PICO_SDK_PATH=/where/pico-sdk/is
cmake ..
make
How to Upload UF2
Uploading a UF2 file to the Raspberry Pi Pico on a Linux system is straightforward. Here’s how you can do it:
Step 1: Prepare Your Raspberry Pi Pico
Enter Bootloader Mode:
- Hold down the BOOTSEL button on your Pico.
- While holding the button, connect the Pico to your Linux PC via USB.
- Release the BOOTSEL button.
- Check If the Pico Is Recognized:
Your Pico should appear as a mass storage device named RPI-RP2.
Verify using the following command:
lsblk
You should see a new device (e.g., /media/$USER/RPI-RP2 or /run/media/$USER/RPI-RP2).
Step 2: Copy the UF2 File to the Pico
cp your_firmware.uf2 /media/$USER/RPI-RP2/
Step 3: Run it
On PicoCalc, the default serial port of the Pico is the USB Type-C port, not its built-in Micro USB port.
So here is the standard running procedures:
- Unplug the pico from Micro-USB cable
- Plug the pico via USB Type-C
- Press Power On on Top of the PicoCalc
If your firmware includes serial output, you can monitor it using minicom or screen:
screen /dev/ttyACM0 115200
(Replace /dev/ttyACM0 with the correct serial port for your Pico.)
The serial monitor of Arduino IDE is another great choice for PicoCalc serial output on both Linux and Windows.