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Develop/nn #1
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4259f88
添加 STM32F407VGT6 作为测试
00lllooolll00 b4bef98
添加 F407VGT6测试
00lllooolll00 3ff1079
[fix]将编译脚本设置为可执行
0c0b2e6
[update]新增一层 层，用于存放一些资源文件
00lllooolll00 9455052
[update]新增一层 层，用于存放一些资源文件
00lllooolll00 1d9dea9
[update]添加文件占位符
00lllooolll00 cce4ba1
[fix]修复了 `ek_main` 无法被强定义使用的问题
00lllooolll00 e270778
[fix]修复了 `ek_main` 无法被强定义使用的问题
00lllooolll00 662af6a
[update]更新各个层级的readme
00lllooolll00 4737a8f
[change]减少构建系统中的注释
00lllooolll00 9a4c89c
[update]说明如何编写单独MCU的CMakeLists
00lllooolll00 1090d0a
[fix]修复CMake报错
00lllooolll00 9f2410f
[fix]修复 workflow 报错
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| file(GLOB_RECURSE L0_SRCS "${CMAKE_CURRENT_SOURCE_DIR}/*.c") | ||
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| add_library(l0_assets STATIC ${L0_SRCS}) | ||
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| target_link_libraries(l0_assets PUBLIC | ||
| global_macros | ||
| global_options | ||
| ) | ||
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| target_include_directories(l0_assets PUBLIC inc) | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,94 @@ | ||
| # L0_Assets (资源文件层) | ||
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| ## 1. 简介 | ||
| L0_Assets 是本项目的资源文件层，用于存放与固件一起打包的资源数据。 | ||
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| 向上：为各层提供资源数据访问接口。 | ||
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| 本层主要用于存储不需要编译的静态资源，如： | ||
| - 图标、图片数据 | ||
| - 字体文件 | ||
| - 配置数据 | ||
| - 其他二进制资源 | ||
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| ## 2. 目录结构 | ||
| ```text | ||
| L0_Assets | ||
| ├── CMakeLists.txt # 构建脚本 | ||
| ├── inc/ # 头文件目录（资源声明） | ||
| │ └── assets.h | ||
| └── src/ # 源文件目录（资源定义） | ||
| └── assets.c | ||
| ``` | ||
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| ## 3. 核心开发原则 | ||
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| **静态资源管理**： | ||
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| 本层主要存放编译到固件中的静态资源数据。 | ||
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| 资源以 C 数组或 const 数据的形式提供，直接链接到最终固件。 | ||
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| **无依赖设计**： | ||
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| 本层不依赖任何其他层级（L1~L5），仅依赖 `global_macros` 和 `global_options`。 | ||
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| 保持最底层的独立性，确保资源数据可被任何层访问。 | ||
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| ## 4. 使用示例 | ||
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| ### 添加图片资源 | ||
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| ```c | ||
| // inc/logo.h | ||
| #ifndef LOGO_H | ||
| #define LOGO_H | ||
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| #include <stdint.h> | ||
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| // Logo 图片数据 (RGB565 格式) | ||
| extern const uint16_t logo_data[]; | ||
| extern const uint32_t logo_width; | ||
| extern const uint32_t logo_height; | ||
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| #endif | ||
| ``` | ||
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| ```c | ||
| // src/logo.c | ||
| #include "logo.h" | ||
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| const uint16_t logo_data[] = { | ||
| 0xFFFF, 0xFFFF, 0x0000, // ... | ||
| }; | ||
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| const uint32_t logo_width = 64; | ||
| const uint32_t logo_height = 64; | ||
| ``` | ||
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| ### 在上层使用资源 | ||
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| ```c | ||
| // L5_App 或 L4 组件中使用 | ||
| #include "assets.h" | ||
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| void display_logo(void) | ||
| { | ||
| // 使用资源数据 | ||
| lcd_draw_bitmap(0, 0, logo_width, logo_height, logo_data); | ||
| } | ||
| ``` | ||
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| ## 5. 常见问题 | ||
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| **Q: 为什么需要单独的资源层？** | ||
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| A: 将资源数据集中管理，便于维护和复用。同时，资源数据可以作为独立模块被任何层访问，符合分层架构的设计理念。 | ||
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| **Q: 资源文件如何影响固件大小？** | ||
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| A: 所有资源数据都会被链接到最终固件中，增加 FLASH 占用。建议使用压缩格式或优化资源大小。 | ||
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| **Q: 能否支持外部资源文件？** | ||
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| A: 本层仅支持编译时嵌入的静态资源。如需运行时加载外部文件（如 SD 卡），应在 L4_Components 中实现文件系统驱动。 |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1 @@ | ||
| // 这个文件夹放置一些资源文件 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,25 +1,14 @@ | ||
| add_library(l1_mcu STATIC) | ||
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| target_link_libraries(l1_mcu PUBLIC | ||
| global_macros | ||
| global_options | ||
| ) | ||
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| target_link_libraries(l1_mcu PUBLIC l0_assets global_macros global_options) | ||
| target_include_directories(l1_mcu PUBLIC inc) | ||
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| # 设置默认 MCU 型号，允许命令行 -DMCU_MODEL=xxx 覆盖 | ||
| # 选择 MCU 型号 | ||
| set(MCU_MODEL "STM32F429ZIT6_GCC" CACHE STRING "Select MCU Model") | ||
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| message(STATUS "L1 Configuration: Integrating ${MCU_MODEL} into l1_mcu") | ||
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| if(NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/${MCU_MODEL}") | ||
| message(FATAL_ERROR "MCU directory not found: ${CMAKE_CURRENT_SOURCE_DIR}/${MCU_MODEL}") | ||
| endif() | ||
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| # 添加 stub 源文件（提供 ek_main 的弱定义） | ||
| target_sources(l1_mcu PRIVATE | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/stub/ek_app_stub.c | ||
| ) | ||
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| # 进入子目录。注意：此时 l1_mcu 目标已经存在，子目录可以向其添加文件 | ||
| add_subdirectory(${MCU_MODEL}) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| [PreviousLibFiles] | ||
| LibFiles=Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_rcc.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_rcc_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_bus.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_rcc.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_system.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_utils.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_flash.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_flash_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_flash_ramfunc.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_gpio.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_gpio_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_gpio.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_dma_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_dma.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_dma.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_dmamux.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_pwr.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_pwr_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_pwr.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_cortex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_cortex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal.h;Drivers/STM32F4xx_HAL_Driver/Inc/Legacy/stm32_hal_legacy.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_def.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_exti.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_exti.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_uart.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_usart.h;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cortex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_exti.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_rcc.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_rcc_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_bus.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_rcc.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_system.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_utils.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_flash.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_flash_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_flash_ramfunc.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_gpio.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_gpio_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_gpio.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_dma_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_dma.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_dma.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_dmamux.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_pwr.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_pwr_ex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_pwr.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_cortex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_cortex.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal.h;Drivers/STM32F4xx_HAL_Driver/Inc/Legacy/stm32_hal_legacy.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_def.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_exti.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_exti.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_uart.h;Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_ll_usart.h;Drivers/CMSIS/Device/ST/STM32F4xx/Include/stm32f407xx.h;Drivers/CMSIS/Device/ST/STM32F4xx/Include/stm32f4xx.h;Drivers/CMSIS/Device/ST/STM32F4xx/Include/system_stm32f4xx.h;Drivers/CMSIS/Device/ST/STM32F4xx/Include/system_stm32f4xx.h;Drivers/CMSIS/Device/ST/STM32F4xx/Source/Templates/system_stm32f4xx.c;Drivers/CMSIS/Include/core_cm35p.h;Drivers/CMSIS/Include/core_armv8mbl.h;Drivers/CMSIS/Include/core_sc300.h;Drivers/CMSIS/Include/core_cm0.h;Drivers/CMSIS/Include/core_cm4.h;Drivers/CMSIS/Include/core_cm23.h;Drivers/CMSIS/Include/cmsis_armclang.h;Drivers/CMSIS/Include/mpu_armv8.h;Drivers/CMSIS/Include/pmu_armv8.h;Drivers/CMSIS/Include/cachel1_armv7.h;Drivers/CMSIS/Include/cmsis_armclang_ltm.h;Drivers/CMSIS/Include/core_cm33.h;Drivers/CMSIS/Include/core_cm7.h;Drivers/CMSIS/Include/cmsis_version.h;Drivers/CMSIS/Include/core_cm55.h;Drivers/CMSIS/Include/tz_context.h;Drivers/CMSIS/Include/core_sc000.h;Drivers/CMSIS/Include/core_cm1.h;Drivers/CMSIS/Include/core_starmc1.h;Drivers/CMSIS/Include/core_cm85.h;Drivers/CMSIS/Include/cmsis_iccarm.h;Drivers/CMSIS/Include/cmsis_armcc.h;Drivers/CMSIS/Include/pac_armv81.h;Drivers/CMSIS/Include/cmsis_compiler.h;Drivers/CMSIS/Include/core_armv81mml.h;Drivers/CMSIS/Include/core_cm3.h;Drivers/CMSIS/Include/mpu_armv7.h;Drivers/CMSIS/Include/cmsis_gcc.h;Drivers/CMSIS/Include/core_armv8mml.h;Drivers/CMSIS/Include/core_cm0plus.h; | ||
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| [PreviousUsedCMakes] | ||
| SourceFiles=Core/Src/main.c;Core/Src/gpio.c;Core/Src/usart.c;Core/Src/stm32f4xx_it.c;Core/Src/stm32f4xx_hal_msp.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cortex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_exti.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c;Drivers/CMSIS/Device/ST/STM32F4xx/Source/Templates/system_stm32f4xx.c;Core/Src/system_stm32f4xx.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cortex.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_exti.c;Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c;Drivers/CMSIS/Device/ST/STM32F4xx/Source/Templates/system_stm32f4xx.c;Core/Src/system_stm32f4xx.c;;; | ||
| HeaderPath=Drivers/STM32F4xx_HAL_Driver/Inc;Drivers/STM32F4xx_HAL_Driver/Inc/Legacy;Drivers/CMSIS/Device/ST/STM32F4xx/Include;Drivers/CMSIS/Include;Middlewares/ST/ARM/DSP/Inc;Core/Inc; | ||
| CDefines=USE_HAL_DRIVER;STM32F407xx;USE_HAL_DRIVER;USE_HAL_DRIVER; | ||
|
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||
| [PreviousGenFiles] | ||
| AdvancedFolderStructure=true | ||
| HeaderFileListSize=5 | ||
| HeaderFiles#0=../Core/Inc/gpio.h | ||
| HeaderFiles#1=../Core/Inc/usart.h | ||
| HeaderFiles#2=../Core/Inc/stm32f4xx_it.h | ||
| HeaderFiles#3=../Core/Inc/stm32f4xx_hal_conf.h | ||
| HeaderFiles#4=../Core/Inc/main.h | ||
| HeaderFolderListSize=1 | ||
| HeaderPath#0=../Core/Inc | ||
| HeaderFiles=; | ||
| SourceFileListSize=5 | ||
| SourceFiles#0=../Core/Src/gpio.c | ||
| SourceFiles#1=../Core/Src/usart.c | ||
| SourceFiles#2=../Core/Src/stm32f4xx_it.c | ||
| SourceFiles#3=../Core/Src/stm32f4xx_hal_msp.c | ||
| SourceFiles#4=../Core/Src/main.c | ||
| SourceFolderListSize=1 | ||
| SourcePath#0=../Core/Src | ||
| SourceFiles=; | ||
|
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| [ThirdPartyIp] | ||
| ThirdPartyIpNumber=1 | ||
| ThirdPartyIpName#0=STMicroelectronics.X-CUBE-ALGOBUILD.1.4.0 | ||
|
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| [ThirdPartyIp#STMicroelectronics.X-CUBE-ALGOBUILD.1.4.0] | ||
| library=../Middlewares/ST/ARM/DSP/Lib/libarm_cortexM4lf_math.a; | ||
| header=../Middlewares/ST/ARM/DSP/Inc/arm_math.h; | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| # STM32 头文件路径 | ||
| set(MX_Include_Dirs | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Core/Inc | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Drivers/STM32F4xx_HAL_Driver/Inc | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Drivers/CMSIS/Device/ST/STM32F4xx/Include | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Drivers/CMSIS/Include | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Middlewares/ST/ARM/DSP/Inc | ||
| ) | ||
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| # 收集源文件 | ||
| file(GLOB MX_Start_S ${CMAKE_CURRENT_SOURCE_DIR}/*.s) | ||
| aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR}/Core/Src MX_Core_Src) | ||
| aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR}/Drivers/STM32F4xx_HAL_Driver/Src MX_Driver_Src) | ||
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| # 创建 cubemx_hal OBJECT 库（不生成独立静态库，对象将被添加到 l1_mcu） | ||
| add_library(cubemx_hal OBJECT ${MX_Start_S} ${MX_Core_Src} ${MX_Driver_Src}) | ||
|
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| # ARM DSP 数学库 - 作为源文件添加 | ||
| target_sources(cubemx_hal PRIVATE | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/Middlewares/ST/ARM/DSP/Lib/libarm_cortexM4lf_math.a | ||
| ) | ||
|
|
||
| # 头文件路径 - PUBLIC（传递给使用者） | ||
| target_include_directories(cubemx_hal PUBLIC | ||
| ${MX_Include_Dirs} | ||
| ) | ||
|
|
||
| # STM32 宏定义 - PUBLIC（传递给使用者） | ||
| target_compile_definitions(cubemx_hal PUBLIC | ||
| USE_HAL_DRIVER | ||
| STM32F407xx | ||
| $<$<CONFIG:Debug>:DEBUG> | ||
| ) | ||
|
|
||
| # 链接全局配置 | ||
| target_link_libraries(cubemx_hal PUBLIC | ||
| global_macros | ||
| global_options | ||
| ) | ||
|
|
||
| # 将 cubemx_hal 的对象文件添加到 l1_mcu（整合到 l1_mcu 静态库中） | ||
| # 这样上层只需要链接 l1_mcu，不需要知道 cubemx_hal 的存在 | ||
| target_sources(l1_mcu PRIVATE | ||
| $<TARGET_OBJECTS:cubemx_hal> | ||
| ) | ||
|
|
||
| # 将 cubemx_hal 的头文件和宏定义传递给 l1_mcu 的使用者 | ||
| target_include_directories(l1_mcu PUBLIC | ||
| $<TARGET_PROPERTY:cubemx_hal,INTERFACE_INCLUDE_DIRECTORIES> | ||
| ) | ||
|
|
||
| target_compile_definitions(l1_mcu PUBLIC | ||
| $<TARGET_PROPERTY:cubemx_hal,INTERFACE_COMPILE_DEFINITIONS> | ||
| ) |
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Add a comment explaining why the --undefined flag is necessary for ek_main, as this is a non-standard linking requirement that forces symbol resolution across layers.