rzsa opened a new pull request, #17032:
URL: https://github.com/apache/nuttx/pull/17032
## Summary
This PR adds conditional compilation support for the STM32H7 LTDC (LCD-TFT
Display Controller) driver in the CMake build system. Specifically, it includes
stm32_ltdc.c in the source list (SRCS) when CONFIG_STM32H7_LTDC is enabled in
the NuttX configuration.
## Impact
The LTDC driver for STM32H7 is already implemented in the codebase, but it
was not being built via CMake due to missing inclusion in CMakeLists.txt. This
change ensures that the driver can be compiled and linked properly when the
configuration option is selected, enabling display support for STM32H7-based
boards without build errors. This aligns with ongoing efforts to improve
STM32H7 peripheral support in NuttX.
## Testing
Tested on host: Linux Mint 22.2 Zara base: Ubuntu 24.04 noble, with CMake
version 3.28.3 and arm-none-eabi-gcc (15:13.2.rel1-2) 13.2.1 20231009
toolchain.
Tested build with CMake for the STM32H7 target, using the stm32h750b-dk:lvgl
configuration.
Build logs before changes:
```
❯ cmake -B ../build -DBOARD_CONFIG=stm32h750b-dk:lvgl -GNinja
-- Found Python3: /home/user/nuttxspace/.env/bin/python3 (found version
"3.12.3") found components: Interpreter
-- Processing includes:
/home/user/nuttxspace/nuttx/boards/arm/stm32h7/stm32h750b-dk/configs/lvgl/defconfig
→ /home/user/nuttxspace/build/.defconfig.processed
-- Initializing NuttX
Select HOST_LINUX=y
-- CMake: 3.28.3
-- Ninja: 1.11.1
-- Board: stm32h750b-dk
-- Config: lvgl
-- Appdir: /home/user/nuttxspace/apps
-- The C compiler identification is GNU 13.2.1
-- The CXX compiler identification is GNU 13.2.1
-- The ASM compiler identification is GNU
-- Found assembler: /usr/bin/arm-none-eabi-gcc
-- Configuring done (4.6s)
-- Generating done (0.2s)
-- Build files have been written to: /home/user/nuttxspace/build
❯ cmake --build ../build
[1814/1817] Linking CXX executable nuttx
FAILED: nuttx
: && /usr/bin/arm-none-eabi-g++ --specs=nosys.specs
-Wl,--print-memory-usage -Wl,--entry=__start -nostdlib -Wl,--gc-sections
-Wl,--cref -Wl,-Map=nuttx.map @CMakeFiles/nuttx.rsp -o nuttx && :
/usr/lib/gcc/arm-none-eabi/13.2.1/../../../arm-none-eabi/bin/ld:
boards/libboard.a(stm32_lcd.c.obj): in function `up_fbinitialize':
stm32_lcd.c:(.text.up_fbinitialize+0x26): undefined reference to
`stm32_ltdcinitialize'
/usr/lib/gcc/arm-none-eabi/13.2.1/../../../arm-none-eabi/bin/ld:
boards/libboard.a(stm32_lcd.c.obj): in function `up_fbgetvplane':
stm32_lcd.c:(.text.up_fbgetvplane+0x2): undefined reference to
`stm32_ltdcgetvplane'
Memory region Used Size Region Size %age Used
itcm: 0 B 64 KB 0.00%
flash: 465004 B 2 MB 22.17%
dtcm1: 0 B 64 KB 0.00%
dtcm2: 0 B 64 KB 0.00%
sram: 13500 B 512 KB 2.57%
sram1: 0 B 128 KB 0.00%
sram2: 0 B 128 KB 0.00%
sram3: 0 B 32 KB 0.00%
sram4: 0 B 64 KB 0.00%
bbram: 0 B 4 KB 0.00%
sdram: 0 B 8 MB 0.00%
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
```
Build logs after changes:
```
❯ cmake -B ../build -DBOARD_CONFIG=stm32h750b-dk:lvgl -GNinja
-- Found Python3: /home/user/nuttxspace/.env/bin/python3 (found version
"3.12.3") found components: Interpreter
-- Processing includes:
/home/user/nuttxspace/nuttx/boards/arm/stm32h7/stm32h750b-dk/configs/lvgl/defconfig
→ /home/user/nuttxspace/build/.defconfig.processed
-- Initializing NuttX
Select HOST_LINUX=y
-- CMake: 3.28.3
-- Ninja: 1.11.1
-- Board: stm32h750b-dk
-- Config: lvgl
-- Appdir: /home/user/nuttxspace/apps
-- The C compiler identification is GNU 13.2.1
-- The CXX compiler identification is GNU 13.2.1
-- The ASM compiler identification is GNU
-- Found assembler: /usr/bin/arm-none-eabi-gcc
-- Configuring done (2.6s)
-- Generating done (0.2s)
-- Build files have been written to: /home/user/nuttxspace/build
❯ cmake --build ../build
[1815/1818] Linking CXX executable nuttx
Memory region Used Size Region Size %age Used
itcm: 0 B 64 KB 0.00%
flash: 465752 B 2 MB 22.21%
dtcm1: 0 B 64 KB 0.00%
dtcm2: 0 B 64 KB 0.00%
sram: 13632 B 512 KB 2.60%
sram1: 0 B 128 KB 0.00%
sram2: 0 B 128 KB 0.00%
sram3: 0 B 32 KB 0.00%
sram4: 0 B 64 KB 0.00%
bbram: 0 B 4 KB 0.00%
sdram: 0 B 8 MB 0.00%
[1818/1818] Generating System.map
```
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