构建错误，"undeclared (first use in function)" 错误但已声明

Question

我是 STM32 MCU 编程的新手，我在 TrueStudio 上开始了一个 SPI 项目。我也需要一个 LCD 库，因此我调整了一个现有的库以供我使用，并将这些文件添加到 Inc 和 Src 下。

当我尝试编译时，我收到一条错误消息，指出函数中第一次使用了先前未声明的定义，但是，它们已在相应的头文件中定义，并且该头文件已被包含在 C 文件中。我错过了什么？我所有的错误似乎都在 'HD44780.c' 文件中。我还应该提到我使用 CubeMX 软件生成引脚定义源代码。项目的 zip 文件可用 here.

如有任何帮助，我们将不胜感激！编辑：此处列出了确切的错误消息：

Description                         Resource    Path            Location    Type
'HD44780_D4_GPIO_PORT' undeclared (first use in this function)  HD44780.c   /STM32F103C6T8_SPI/Src  line 242    C/C++ Problem
'HD44780_D5_GPIO_PORT' undeclared (first use in this function)  HD44780.c   /STM32F103C6T8_SPI/Src  line 241    C/C++ Problem
'HD44780_D6_GPIO_PORT' undeclared (first use in this function)  HD44780.c   /STM32F103C6T8_SPI/Src  line 240    C/C++ Problem
'HD44780_D7_GPIO_PORT' undeclared (first use in this function)  HD44780.c   /STM32F103C6T8_SPI/Src  line 239    C/C++ Problem
'HD44780_E_GPIO_PORT' undeclared (first use in this function)   HD44780.c   /STM32F103C6T8_SPI/Src  line 39     C/C++ Problem
'HD44780_RS_GPIO_PORT' undeclared (first use in this function)  HD44780.c   /STM32F103C6T8_SPI/Src  line 36     C/C++ Problem
'HD44780_RS_GPIO_PORT' undeclared (first use in this function)  HD44780.c   /STM32F103C6T8_SPI/Src  line 37     C/C++ Problem

Warnings
implicit declaration of function 'DELAY_Init' [-Wimplicit-function-declaration] HD44780.c   /STM32F103C6T8_SPI/Src  line 81 C/C++ Problem

Info
each undeclared identifier is reported only once for each function it appears in    HD44780.c   /STM32F103C6T8_SPI/Src  line 36 C/C++ Problem
in expansion of macro 'HD44780_E_BLINK' HD44780.c   /STM32F103C6T8_SPI/Src  line 243    C/C++ Problem
in expansion of macro 'HD44780_E_HIGH'  HD44780.c   /STM32F103C6T8_SPI/Src  line 41 C/C++ Problem
in expansion of macro 'HD44780_RS_HIGH' HD44780.c   /STM32F103C6T8_SPI/Src  line 229    C/C++ Problem
in expansion of macro 'HD44780_RS_LOW'  HD44780.c   /STM32F103C6T8_SPI/Src  line 219    C/C++ Problem

Answer 1

在 main.h 中，您定义的是 HD44780_*_GPIO_Port 而不是 HD44780_*_GPIO_PORT。注意全大写 PORT.

构建错误，"undeclared (first use in function)" 错误但已声明

Build error, "undeclared (first use in function)" error but it has been declared

microcontroller

stm32

build-error