samd21-tiny Sample project using tiny with SAMD21G18A. Setup Install gcc-arm-none-eabi Install openocd Use Compile make -f target.mk Clean make -f target.mk clean Erase via SWD make -f target.mk erase Flash via SWD make -f target.mk upload Resources SAMD21G18A Datasheet SAMD Arduino Core Metro M0 Pinout Metro M0 Schematic Seeeduino XIAO Pinout Seeeduino XIAO Schematic