Updates for README and build script

[jchillerup]

Consider this a draft PR until further notice.

Changes:

• Added some more notes to the README and explained the steps to install the Pico SDK
• Made a script that builds everything

The script needs to be updated with some distro-specific logic to install requirements. It also needs some echos to inform the user what's going on. Finally it would be nice if it could also flash the Raspberry Pi Pico.

[0rShemesh]

doesnt work for me :(:

/usr/lib/gcc/arm-none-eabi/10.3.1/../../../arm-none-eabi/bin/ld: CMakeFiles/tamarin_firmware.dir/main.c.obj: in function `main':
main.c:(.text.startup.main+0x68): undefined reference to `tud_vendor_flush'
/usr/lib/gcc/arm-none-eabi/10.3.1/../../../arm-none-eabi/bin/ld: main.c:(.text.startup.main+0x8e): undefined reference to `tud_vendor_flush'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/tamarin_firmware.dir/build.make:1191: tamarin_firmware.elf] Error 1
make[1]: *** [CMakeFiles/Makefile2:1283: CMakeFiles/tamarin_firmware.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

[intervade]

doesnt work for me :(:

/usr/lib/gcc/arm-none-eabi/10.3.1/../../../arm-none-eabi/bin/ld: CMakeFiles/tamarin_firmware.dir/main.c.obj: in function `main':
main.c:(.text.startup.main+0x68): undefined reference to `tud_vendor_flush'
/usr/lib/gcc/arm-none-eabi/10.3.1/../../../arm-none-eabi/bin/ld: main.c:(.text.startup.main+0x8e): undefined reference to `tud_vendor_flush'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/tamarin_firmware.dir/build.make:1191: tamarin_firmware.elf] Error 1
make[1]: *** [CMakeFiles/Makefile2:1283: CMakeFiles/tamarin_firmware.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

This error has to do with tinyusb. If you take out the part of the script where it changes the pico-sdk version it will compile. However, JTAG will probably be broken and seems can be fixed with pr #16