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Updated printf_config readme #5

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Updated printf_config readme #5

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13 changes: 11 additions & 2 deletions markdown/STM32_printf_config.md
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Expand Up @@ -36,8 +36,17 @@
This config is for `STM32F407VGT`. For others, you need to modify `hal` include.

3. Modify Makefile
- Add `printf_config.c` on `C_SOURCES`.
- Add `-u _printf_float` on `LDFLAGS` to print floating points.
- Add `printf_config.c` on `C_SOURCES` variable. The `C_SOURCES` variable is located in the MakeFile.
Example: `Core/Src/printf_config.c`
- Add `-u _printf_float` on `LDFLAGS` variable to print floating points. The `LDFLAGS` variable is located below the line `# libraries`in the Makefile.
```cpp
LDFLAGS = $(MCU) -specs=nano.specs -T$(LDSCRIPT) $(LIBDIR) $(LIBS) -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref -Wl,--gc-sections
```
The modified `LDFLAGS` is reflected as:

```cpp
LDFLAGS = $(MCU) -specs=nano.specs -T$(LDSCRIPT) $(LIBDIR) $(LIBS) -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref -Wl,--gc-sections -u _printf_float
```


## STM32 Cube Programmer
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