CFLAGS_MCU += -mtune=cortex-m0plus -mcpu=cortex-m0plus -msoft-float
CFLAGS_MCU += -DCFG_TUSB_MCU=OPT_MCU_SAMD21
MPY_CROSS_MCU_ARCH = armv6m
MICROPY_HW_CODESIZE ?= 184K
MICROPY_VFS_LFS1 ?= 1
SRC_S += shared/runtime/gchelper_thumb1.s