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CH32V003/Makefile

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+# SPDX-License-Identifier: MIT
+#
+# Fully open-source CH32V003 template using ch32fun (MIT).
+#
+# Toolchain: Arch packages riscv64-elf-gcc + riscv64-elf-newlib
+# Flashing:  minichlink (MIT, part of ch32fun) or wchisp
+#
+# ch32fun is used as an external SDK. Point CH32FUN_ROOT at your checkout:
+#   git clone https://github.com/cnlohr/ch32fun ~/code/ch32fun
+#
+# This build does NOT use the WCH EVT SDK, WCH's GCC, libprintf, or IQmath.
+
+TARGET      ?= firmware
+TARGET_MCU  ?= CH32V003
+
+# Root of the ch32fun checkout (the directory containing ch32fun/ and minichlink/).
+CH32FUN_ROOT ?= $(HOME)/code/ch32fun
+CH32FUN      ?= $(CH32FUN_ROOT)/ch32fun
+MINICHLINK   ?= $(CH32FUN_ROOT)/minichlink
+
+# Arch's riscv64-elf-newlib installs its headers here. ch32fun only needs the
+# headers; it never links newlib (see -nostdlib below).
+NEWLIB ?= /usr/riscv64-elf/include
+
+# Arch's bare-metal RISC-V GCC. ch32fun auto-detects this too, but pinning it
+# makes the build reproducible. Override for another toolchain, e.g.
+#   make PREFIX=riscv32-unknown-elf
+PREFIX ?= riscv64-elf
+
+ifeq ($(wildcard $(CH32FUN)/ch32fun.mk),)
+$(error ch32fun not found at $(CH32FUN). Set CH32FUN_ROOT=/path/to/ch32fun)
+endif
+
+ifeq ($(wildcard $(NEWLIB)/stdio.h),)
+$(error newlib headers not found at $(NEWLIB). Install riscv64-elf-newlib or set NEWLIB=/path/to/include)
+endif
+
+ifeq ($(shell command -v $(PREFIX)-gcc 2>/dev/null),)
+$(error $(PREFIX)-gcc not found. Install riscv64-elf-gcc or set PREFIX=/path/to/toolchain-prefix)
+endif
+
+# ch32fun's build rules:
+#   - compiles ch32fun.c and $(TARGET).c
+#   - uses ch32fun.ld, -nostdlib and ch32fun/misc/libgcc.a
+#   - emits $(TARGET).elf/.bin/.hex/.lst/.map
+include $(CH32FUN)/ch32fun.mk
+
+# Build firmware only; never flash implicitly.
+all: $(TARGET).bin
+
+flash: cv_flash
+clean: cv_clean
+
+size: $(TARGET).elf
+	$(PREFIX)-size $<
+
+.PHONY: all flash clean size