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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-embed-gcc-xpack
CROSS_COMPILE ?= riscv-none-embed-
# Submodules
NUCLEI_SDK = hw/mcu/gd/nuclei-sdk
DEPS_SUBMODULES += $(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
SKIP_NANOLIB = 1
CFLAGS += \
-march=rv32imac \
-mabi=ilp32 \
-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 \
$(GD32VF103_SDK_DRIVER)/gd32vf103_rcu.c \
$(GD32VF103_SDK_DRIVER)/gd32vf103_gpio.c \
$(GD32VF103_SDK_DRIVER)/Usb/gd32vf103_usb_hw.c \
$(GD32VF103_SDK_DRIVER)/gd32vf103_usart.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_PORT = 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 $<
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