Pico Beta v0.33

This is a beta release of the CubeSatSim code ported to the Raspberry Pi Pico for the v0.4 Pico PCB (also works with the v0.3 PCB). Here is the info on this board: https://github.com/alanbjohnston/CubeSatSim/tree/pico/hardware/pico/v0.4 The code is compiled using the Arduino software.

The binary UF2 file is included with this release. To install it, follow these steps:

Plug your Raspberry Pi Pico into your computer using the micro USB port while holding down the BOOTSEL button (white button on the Pico). It should mount as a drive RPI-RP2.
Drag the .UF2 file from this release to the Pico flash drive
You can monitor the serial output using Arduino or a terminal emulator such as PUTTY to see the log files or make configuration changes.
This code transmits on the usual 434.9 MHz frequency

New to this release:

• Change mode should now work correctly even in SSTV mode
• The v1 SSTV image sequence of first white AMSAT logo, then camera images if present or black stored image repeating
• Formatting now automatically reboots and should work

Known issues:

• Takes about 65 seconds to generate an SSTV image. This can hopefully be reduced in the future
• When holding pushbutton to change modes, it can take up to 4 seconds for the green LED to start blinking. There have been times in FSK and BPSK mode where it seems to take even longer - let me know if you see this.
• Sometimes the Arduino Serial Monitor stops displaying after a mode change. Closing and reopening the Serial Monitor seems to fix it.
• Sometimes QQSSTV on the Pi Ground station in Auto mode locks on ML mode instead of Scottie 2 - the image colors are wrong and repeated twice. Stopping and starting usually fixes this.

What's Changed

• Pico format by @alanbjohnston in #240
• Pico v0.33 debug by @alanbjohnston in #241

Full Changelog: v0.32...v0.33