Processing pico (platform: https://github.com/maxgerhardt/platform-raspberrypi.git; board: pico; framework: picosdk)
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Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/raspberrypi/pico.html
PLATFORM: Raspberry Pi RP2040 (1.16.0+sha.1f67f1e) > Raspberry Pi Pico
HARDWARE: RP2040 133MHz, 256KB RAM, 2MB Flash
DEBUG: Current (blackmagic) External (blackmagic, cmsis-dap, jlink, pico-debug, picoprobe, raspberrypi-swd)
PACKAGES: 
 - framework-picosdk @ 1.20000.0+sha.f943e7b 
 - tool-picotool-rp2040-earlephilhower @ 5.140200.240929 (14.2.0) 
 - toolchain-gccarmnoneeabi @ 1.90301.200702 (9.3.1)
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 1 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Linking .pio/build/pico/firmware.elf
/home/moritz/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/9.3.1/../../../../arm-none-eabi/bin/ld: .pio/build/pico/src/main.o: in function `main':
main.cpp:(.text.startup.main+0x10): undefined reference to `spi_init'
collect2: error: ld returned 1 exit status
*** [.pio/build/pico/firmware.elf] Error 1

[env:pico]
platform = https://github.com/maxgerhardt/platform-raspberrypi.git
board = pico
framework = picosdk

#include <hardware/spi.h>

int main() {
    spi_init(spi0, 123);
    return 0;
}