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Add a demo for using LVGL, DRAM, LLVM Toolchain, ELF on an STM32F746G discovery board
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‎Tools/elf2hex.py‎

Lines changed: 16 additions & 1 deletion
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@@ -36,11 +36,17 @@ def main():
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parser.add_argument('input')
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parser.add_argument('output')
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parser.add_argument('--symbol-map')
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parser.add_argument('--relocate', action='append')
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args = parser.parse_args()
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inf = open(args.input, "rb")
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outf = open(args.output, "wb")
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relocations = {}
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for r in args.relocate:
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(a, b) = r.split(":")
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relocations[int(a, 16)] = int(b, 16)
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def emitrecord(record):
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checksum = 0
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pos = 0
@@ -75,7 +81,16 @@ def emit(vmaddr, data):
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continue
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vmaddr = segment.header.p_paddr
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data = segment.data()
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emit(segment.header.p_paddr, data)
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flags = ""
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flags += "r" if segment.header.p_flags & 0x4 else "-"
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flags += "w" if segment.header.p_flags & 0x2 else "-"
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flags += "x" if segment.header.p_flags & 0x1 else "-"
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print(f"PT_LOAD {flags} at 0x{segment.header.p_paddr:08x} - 0x{segment.header.p_paddr + len(data):08x}, size {len(data)} (0x{len(data):04x})")
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placement_addr = segment.header.p_paddr
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if segment.header.p_paddr in relocations:
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placement_addr = relocations[segment.header.p_paddr]
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print(f" ... relocating to 0x{placement_addr:08x}")
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emit(placement_addr, data)
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chunklen = 0
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vmaddr = 0

‎stm32-lvgl/.gitignore‎

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lvgl
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llvm-toolchain

‎stm32-lvgl/.sourcekit-lsp/config.json‎

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{
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"swiftPM": {
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"configuration": "release",
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"triple": "armv7em-none-none-eabi",
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"__comment": "XXX SourceKit-LSP seems to ignore the toolset (relative or absolute path)...",
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"toolset": ".../toolset.json",
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"swiftCompilerFlags": [
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"-enable-experimental-feature", "Embedded",
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"-enable-experimental-feature", "Extern",
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]
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}
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}

‎stm32-lvgl/.swift-format‎

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{
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"lineLength" : 120
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}

‎stm32-lvgl/.swift-version‎

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main-snapshot-2025-03-28

‎stm32-lvgl/Makefile‎

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##===----------------------------------------------------------------------===##
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##
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## This source file is part of the Swift open source project
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##
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## Copyright (c) 2023 Apple Inc. and the Swift project authors.
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## Licensed under Apache License v2.0 with Runtime Library Exception
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##
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## See https://swift.org/LICENSE.txt for license information
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##
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##===----------------------------------------------------------------------===##
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# Paths
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REPOROOT := $(shell git rev-parse --show-toplevel)
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TOOLSROOT := $(REPOROOT)/Tools
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TOOLSET := $(PWD)/toolset.json
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ELF2HEX := $(TOOLSROOT)/elf2hex.py
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SWIFT_BUILD := swift build
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NM := nm
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LLVM_TOOLCHAIN := $(PWD)/llvm-toolchain
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# Flags
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ARCH := armv7em
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TARGET := $(ARCH)-none-none-eabi
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SWIFT_BUILD_ARGS := \
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--configuration release \
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--triple $(TARGET) \
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--toolset $(TOOLSET) \
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--disable-local-rpath
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BUILDROOT := $(shell $(SWIFT_BUILD) $(SWIFT_BUILD_ARGS) --show-bin-path)
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.PHONY: build
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build:
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@echo "checking dependencies..."
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# TODO: Check that we have swiftly and recent Swift main toolchain
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if [[ ! -d $(PWD)/lvgl ]]; then echo "\n *** LVGL checkout not found, please run ./fetch-dependencies.sh\n" ; exit 1 ; fi
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if [[ ! -d $(PWD)/llvm-toolchain ]]; then echo "\n *** LLVM toolchain checkout not found, please run ./fetch-dependencies.sh\n" ; exit 1 ; fi
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mkdir -p .build
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@echo "configuring LVGL..."
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cmake -B .build/lvgl -G Ninja ./lvgl \
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-DCMAKE_EXPORT_COMPILE_COMMANDS=On \
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-DTOOLCHAIN_PATH=$(LLVM_TOOLCHAIN) \
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-DCMAKE_TOOLCHAIN_FILE=../clang-arm-toolchain.cmake \
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-DLV_CONF_PATH=../Sources/CLVGL/include/lv_conf.h
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@echo "building LVGL..."
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cmake --build .build/lvgl
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@echo "building..."
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$(SWIFT_BUILD) \
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$(SWIFT_BUILD_ARGS) \
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--verbose
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@echo "disassembling..."
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$(LLVM_TOOLCHAIN)/bin/llvm-objdump --all-headers --disassemble --mcpu=cortex-m7 \
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$(BUILDROOT)/Application \
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| c++filt | swift demangle > $(BUILDROOT)/Application.disassembly
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@echo "extracting binary..."
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$(eval FLASH_DATA_START = `$(NM) -p $(BUILDROOT)/Application | grep __flash_data_start | cut -d' ' -f1`)
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@echo " FLASH_DATA_START = 0x$(FLASH_DATA_START)"
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$(eval SRAM_DATA_START = `$(NM) -p $(BUILDROOT)/Application | grep __data_start | cut -d' ' -f1`)
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@echo " SRAM_DATA_START = 0x$(SRAM_DATA_START)"
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$(eval FLASH_DATA_LEN = `$(NM) -p $(BUILDROOT)/Application | grep __flash_data_len | cut -d' ' -f1`)
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@echo " FLASH_DATA_LEN = 0x$(FLASH_DATA_LEN)"
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$(ELF2HEX) \
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$(BUILDROOT)/Application $(BUILDROOT)/Application.hex --relocate "0x$(SRAM_DATA_START):0x$(FLASH_DATA_START)"
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ls -al $(BUILDROOT)/Application.hex
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@echo "\n *** All done, build succeeded!\n"
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flash:
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@echo "flashing..."
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st-flash --reset --format ihex write $(BUILDROOT)/Application.hex
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.PHONY: clean
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clean:
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@echo "cleaning..."
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@swift package clean
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@rm -rf .build

‎stm32-lvgl/Package.resolved‎

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‎stm32-lvgl/Package.swift‎

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// swift-tools-version: 5.10
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import PackageDescription
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let package = Package(
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name: "stm32-lvgl",
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platforms: [
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.macOS(.v10_15)
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],
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products: [
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.executable(name: "Application", targets: ["Application"])
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],
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dependencies: [
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.package(url: "https://github.com/apple/swift-mmio", branch: "main")
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],
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targets: [
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.executableTarget(name: "Application",
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dependencies: [
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"Registers",
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"Support",
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"CLVGL",
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]),
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// SVD2Swift \
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// --input Tools/SVDs/stm32f7x6.patched.svd \
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// --output stm32-lvgl/Sources/STM32F7x6 \
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// --peripherals FLASH LTDC RCC PWR FMC SCB DBGMCU USART1 STK NVIC \
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// GPIOA GPIOB GPIOC GPIOD GPIOE GPIOF GPIOG GPIOH GPIOI GPIOJ GPIOK \
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// --access-level public
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.target(name: "Registers",
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dependencies: [
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.product(name: "MMIO", package: "swift-mmio"),
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]),
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.target(name: "Support"),
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.target(name: "CLVGL"),
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])

‎stm32-lvgl/README.md‎

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# stm32-lvgl
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...
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## How to build and run this example:
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...

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