Initial project setup

managed_components/espressif__tinyusb/hw/bsp/gd32vf103/family.mk

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+# https://www.embecosm.com/resources/tool-chain-downloads/#riscv-stable
+#CROSS_COMPILE ?= riscv32-unknown-elf-
+
+# Toolchain from https://nucleisys.com/download.php
+#CROSS_COMPILE ?= riscv-nuclei-elf-
+
+# Toolchain from https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack
+CROSS_COMPILE ?= riscv-none-elf-
+
+# Submodules
+NUCLEI_SDK = hw/mcu/gd/nuclei-sdk
+
+# Nuclei-SDK paths
+GD32VF103_SDK_SOC = $(NUCLEI_SDK)/SoC/gd32vf103
+GD32VF103_SDK_DRIVER = $(GD32VF103_SDK_SOC)/Common/Source/Drivers
+LIBC_STUBS = $(GD32VF103_SDK_SOC)/Common/Source/Stubs
+STARTUP_ASM = $(GD32VF103_SDK_SOC)/Common/Source/GCC
+
+include $(TOP)/$(BOARD_PATH)/board.mk
+CPU_CORE ?= rv32imac-ilp32
+
+CFLAGS += \
+	-mcmodel=medlow \
+	-mstrict-align \
+	-nostdlib -nostartfiles \
+	-DCFG_TUSB_MCU=OPT_MCU_GD32VF103 \
+	-DDOWNLOAD_MODE=DOWNLOAD_MODE_FLASHXIP
+
+# mcu driver cause following warnings
+CFLAGS += -Wno-error=unused-parameter
+
+SRC_C += \
+	src/portable/synopsys/dwc2/dcd_dwc2.c \
+	src/portable/synopsys/dwc2/hcd_dwc2.c \
+	src/portable/synopsys/dwc2/dwc2_common.c \
+	$(GD32VF103_SDK_DRIVER)/gd32vf103_gpio.c \
+	$(GD32VF103_SDK_DRIVER)/gd32vf103_rcu.c \
+	$(GD32VF103_SDK_DRIVER)/gd32vf103_usart.c \
+	$(GD32VF103_SDK_DRIVER)/Usb/gd32vf103_usb_hw.c \
+	$(LIBC_STUBS)/sbrk.c \
+	$(LIBC_STUBS)/close.c \
+	$(LIBC_STUBS)/isatty.c \
+	$(LIBC_STUBS)/fstat.c \
+	$(LIBC_STUBS)/lseek.c \
+	$(LIBC_STUBS)/read.c
+
+SRC_S += \
+	$(STARTUP_ASM)/startup_gd32vf103.S \
+	$(STARTUP_ASM)/intexc_gd32vf103.S
+
+INC += \
+	$(TOP)/$(BOARD_PATH) \
+	$(TOP)/$(NUCLEI_SDK)/NMSIS/Core/Include \
+	$(TOP)/$(GD32VF103_SDK_SOC)/Common/Include \
+	$(TOP)/$(GD32VF103_SDK_SOC)/Common/Include/Usb
+
+# For freeRTOS port source
+FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/RISC-V
+
+# For flash-jlink target
+JLINK_IF = jtag
+
+# flash target ROM bootloader
+flash: $(BUILD)/$(PROJECT).bin
+	dfu-util -R -a 0 --dfuse-address 0x08000000 -D $<