Atmel Studio 7-静态库未定义函数参考

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我有两个项目的解决方案：-静态库-可执行文件

Exec项目显然取决于库。编译器可以弄清楚库在哪里，我可以使用除IO.c上的内容以外的所有内容（如定义的符号）。在输出文件夹中，我可以找到已复制的IO.o，因此库正在正常构建。错误必须在exec项目方面，但我不知道在哪里搜索。 Google使我失败，或者我搜索的方向错误。

静态库项目的结构如下：

ATMEGA2560
|-headers
| |-IO.h
|-source
| |-IO.c
|-ATMEGA2560.h

可执行项目的结构如下：

|-main.c

编译器包含路径：

../../ATMEGA2560/Release/headers <- IO.h
../../ATMEGA2560/Release/ <- ATMEGA2560.h

所有编译器选项

-x c -funsigned-char -funsigned-bitfields -DNDEBUG  -I"E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include" -I"../../ATMEGA2560/Release/headers" -I"../../ATMEGA2560/Release"  -O3 -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -Wall -Wextra -Wundef -mmcu=atmega2560 -B "E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560" -c -std=gnu99 -v -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)"

链接器库：

libm
libATMEGA2560

链接器库路径：

../../ATMEGA2560/Release <- libATMEGA2560.a

所有链接器选项：

-Wl,-static -Wl,-Map="$(OutputFileName).map" -Wl,--start-group -Wl,-lm -Wl,-lATMEGA2560  -Wl,--end-group -Wl,-L"../../ATMEGA2560/Release"  -Wl,--gc-sections -mrelax -mmcu=atmega2560 -B "E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560" -u _fstat -u _read -u _write

ATMEGA2560.h

#ifndef ATMEGA2560_H_
#define ATMEGA2560_H_

#define F_CPU 16000000L

#include <avr/io.h>
#include <util/delay.h>

#include "headers/IO.h"

#endif

IO.h

#ifndef IO_H_
#define IO_H_

void function_1(void);

#endif

IO.c

#include "../headers/IO.h"

void function_1(void)
    return;

main.c

#include "ATMEGA2560.h"

int main(void)

    function_1();
    DDRB = 0b10000000; // configure pin 7 of PORTB as output (digital pin 13 on the Arduino Mega2560)

    while(1)
    
        PORTB = 0b10000000; // set 7th bit to HIGH
        _delay_ms(1000);
        PORTB = 0b00000000; // set 7th bit to LOW
        _delay_ms(1000);

编译输出：

------ Build started: Project: ATMEGA2560, Configuration: Release AVR ------
        Shell Utils Path E:\ATMEL\7.0\shellUtils
        E:\ATMEL\7.0\shellUtils\make.exe all 
        Using built-in specs.
        Reading specs from E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/device-specs/specs-atmega2560
        COLLECT_GCC=E:\ATMEL\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\avr-gcc.exe
        Target: avr
        Configured with: /home/toolsbuild/workspace/avr8-gnu-toolchain/src/gcc/configure LDFLAGS=-L/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs/lib CPPFLAGS= --target=avr --host=i686-w64-mingw32 --build=x86_64-pc-linux-gnu --prefix=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86 --libdir=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86/lib --enable-languages=c,c++ --with-dwarf2 --enable-doc --disable-shared --disable-libada --disable-libssp --disable-nls --with-avrlibc=yes --with-mpfr=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs --with-gmp=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs --with-mpc=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs --enable-win32-registry=avrtoolchain --with-pkgversion=AVR_8_bit_GNU_Toolchain_3.6.2_1778 --with-bugurl=http://www.microchip.com
        Thread model: single
        gcc version 5.4.0 (AVR_8_bit_GNU_Toolchain_3.6.2_1778) 
        COLLECT_GCC_OPTIONS='-funsigned-char' '-funsigned-bitfields' '-D' 'NDEBUG' '-I' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include' '-O3' '-ffunction-sections' '-fdata-sections' '-fpack-struct' '-fshort-enums' '-mrelax' '-Wall' '-Wextra' '-Wundef'  '-B' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560' '-c' '-std=gnu99' '-v' '-MD' '-MP' '-MF' 'source/IO.d' '-MT' 'source/IO.d' '-MT' 'source/IO.o' '-o' 'source/IO.o' '-specs=device-specs/specs-atmega2560' '-mmcu=avr6'
         e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../libexec/gcc/avr/5.4.0/cc1.exe -quiet -v -I E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include -imultilib avr6 -iprefix e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/ -MD source/IO.d -MF source/IO.d -MP -MT source/IO.d -MT source/IO.o -D__AVR_ATmega2560__ -D__AVR_DEVICE_NAME__=atmega2560 -D__AVR_DEV_LIB_NAME__=m2560 -D NDEBUG ../source/IO.c -mn-flash=4 -mno-skip-bug -quiet -dumpbase IO.c -mrelax -mmcu=avr6 -auxbase-strip source/IO.o -O3 -Wall -Wextra -Wundef -std=gnu99 -version -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -o C:\Users\gothi\AppData\Local\Temp\cc9EwEFa.s
        GNU C99 (AVR_8_bit_GNU_Toolchain_3.6.2_1778) version 5.4.0 (avr)
            compiled by GNU C version 4.7.4, GMP version 5.0.2, MPFR version 3.0.0, MPC version 0.9
        GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
        ignoring nonexistent directory "e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/../../../../avr/sys-include"
        ignoring duplicate directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/include"
        ignoring duplicate directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/include-fixed"
        ignoring nonexistent directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/../../../../avr/sys-include"
        ignoring duplicate directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/../../../../avr/include"
        #include "..." search starts here:
        #include <...> search starts here:
         E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include
         e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/include
         e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/include-fixed
         e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/../../../../avr/include
        End of search list.
        GNU C99 (AVR_8_bit_GNU_Toolchain_3.6.2_1778) version 5.4.0 (avr)
            compiled by GNU C version 4.7.4, GMP version 5.0.2, MPFR version 3.0.0, MPC version 0.9
        GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
        Compiler executable checksum: 7a32dfd92aeb38c911f2be52b5ef5d52
        COLLECT_GCC_OPTIONS='-funsigned-char' '-funsigned-bitfields' '-D' 'NDEBUG' '-I' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include' '-O3' '-ffunction-sections' '-fdata-sections' '-fpack-struct' '-fshort-enums' '-mrelax' '-Wall' '-Wextra' '-Wundef'  '-B' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560' '-c' '-std=gnu99' '-v' '-MD' '-MP' '-MF' 'source/IO.d' '-MT' 'source/IO.d' '-MT' 'source/IO.o' '-o' 'source/IO.o' '-specs=device-specs/specs-atmega2560' '-mmcu=avr6'
         e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/as.exe -mmcu=avr6 --mlink-relax -mno-skip-bug -o source/IO.o C:\Users\gothi\AppData\Local\Temp\cc9EwEFa.s
        COMPILER_PATH=E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../libexec/gcc/avr/5.4.0/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../libexec/gcc/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/
        LIBRARY_PATH=E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/avr6/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/avr6/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/lib/avr6/;E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/lib/
        COLLECT_GCC_OPTIONS='-funsigned-char' '-funsigned-bitfields' '-D' 'NDEBUG' '-I' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include' '-O3' '-ffunction-sections' '-fdata-sections' '-fpack-struct' '-fshort-enums' '-mrelax' '-Wall' '-Wextra' '-Wundef'  '-B' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560' '-c' '-std=gnu99' '-v' '-MD' '-MP' '-MF' 'source/IO.d' '-MT' 'source/IO.d' '-MT' 'source/IO.o' '-o' 'source/IO.o' '-specs=device-specs/specs-atmega2560' '-mmcu=avr6'
        E:\ATMEL\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\avr-ar.exe: creating libATMEGA2560.a
        C:\Windows\System32\xcopy /Y "C:\Users\gothi\Documents\Atmel Studio\7.0\Drone\ATMEGA2560\headers\*.h" "C:\Users\gothi\Documents\Atmel Studio\7.0\Drone\ATMEGA2560\Release\headers\*.h" 
C:\Windows\System32\xcopy /Y "C:\Users\gothi\Documents\Atmel Studio\7.0\Drone\ATMEGA2560\*.h" "C:\Users\USER\Documents\Atmel Studio\7.0\Drone\ATMEGA2560\Release\*.h" 
        C:\Users\gothi\Documents\Atmel Studio\7.0\Drone\ATMEGA2560\headers\IO.h
        1 File(s) copied
        C:\Users\gothi\Documents\Atmel Studio\7.0\Drone\ATMEGA2560\ATMEGA2560.h
        1 File(s) copied
------ Build started: Project: Drone, Configuration: Release AVR ------
        Shell Utils Path E:\ATMEL\7.0\shellUtils
        E:\ATMEL\7.0\shellUtils\make.exe all 
        Using built-in specs.
        Reading specs from E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/device-specs/specs-atmega2560
        COLLECT_GCC=E:\ATMEL\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\avr-gcc.exe
        Target: avr
        Configured with: /home/toolsbuild/workspace/avr8-gnu-toolchain/src/gcc/configure LDFLAGS=-L/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs/lib CPPFLAGS= --target=avr --host=i686-w64-mingw32 --build=x86_64-pc-linux-gnu --prefix=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86 --libdir=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86/lib --enable-languages=c,c++ --with-dwarf2 --enable-doc --disable-shared --disable-libada --disable-libssp --disable-nls --with-avrlibc=yes --with-mpfr=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs --with-gmp=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs --with-mpc=/home/toolsbuild/workspace/avr8-gnu-toolchain/avr8-gnu-toolchain-win32_x86-hostlibs --enable-win32-registry=avrtoolchain --with-pkgversion=AVR_8_bit_GNU_Toolchain_3.6.2_1778 --with-bugurl=http://www.microchip.com
        Thread model: single
        gcc version 5.4.0 (AVR_8_bit_GNU_Toolchain_3.6.2_1778) 
        COLLECT_GCC_OPTIONS='-funsigned-char' '-funsigned-bitfields' '-D' 'NDEBUG' '-I' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include' '-I' '../../ATMEGA2560/Release/headers' '-I' '../../ATMEGA2560/Release' '-O3' '-ffunction-sections' '-fdata-sections' '-fpack-struct' '-fshort-enums' '-mrelax' '-Wall' '-Wextra' '-Wundef'  '-B' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560' '-c' '-std=gnu99' '-v' '-MD' '-MP' '-MF' 'main.d' '-MT' 'main.d' '-MT' 'main.o' '-o' 'main.o' '-specs=device-specs/specs-atmega2560' '-mmcu=avr6'
         e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../libexec/gcc/avr/5.4.0/cc1.exe -quiet -v -I E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include -I ../../ATMEGA2560/Release/headers -I ../../ATMEGA2560/Release -imultilib avr6 -iprefix e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/ -MD main.d -MF main.d -MP -MT main.d -MT main.o -D__AVR_ATmega2560__ -D__AVR_DEVICE_NAME__=atmega2560 -D__AVR_DEV_LIB_NAME__=m2560 -D NDEBUG .././main.c -mn-flash=4 -mno-skip-bug -quiet -dumpbase main.c -mrelax -mmcu=avr6 -auxbase-strip main.o -O3 -Wall -Wextra -Wundef -std=gnu99 -version -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -o C:\Users\gothi\AppData\Local\Temp\ccvaSiXr.s
        GNU C99 (AVR_8_bit_GNU_Toolchain_3.6.2_1778) version 5.4.0 (avr)
            compiled by GNU C version 4.7.4, GMP version 5.0.2, MPFR version 3.0.0, MPC version 0.9
        GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
        ignoring nonexistent directory "e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/../../../../avr/sys-include"
        ignoring duplicate directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/include"
        ignoring duplicate directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/include-fixed"
        ignoring nonexistent directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/../../../../avr/sys-include"
        ignoring duplicate directory "e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/lib/gcc/../../lib/gcc/avr/5.4.0/../../../../avr/include"
        #include "..." search starts here:
        #include <...> search starts here:
         E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include
         ../../ATMEGA2560/Release/headers
         ../../ATMEGA2560/Release
         e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/include
         e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/include-fixed
         e:\atmel\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\../lib/gcc/avr/5.4.0/../../../../avr/include
        End of search list.
        GNU C99 (AVR_8_bit_GNU_Toolchain_3.6.2_1778) version 5.4.0 (avr)
            compiled by GNU C version 4.7.4, GMP version 5.0.2, MPFR version 3.0.0, MPC version 0.9
        GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
        Compiler executable checksum: 7a32dfd92aeb38c911f2be52b5ef5d52
        COLLECT_GCC_OPTIONS='-funsigned-char' '-funsigned-bitfields' '-D' 'NDEBUG' '-I' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include' '-I' '../../ATMEGA2560/Release/headers' '-I' '../../ATMEGA2560/Release' '-O3' '-ffunction-sections' '-fdata-sections' '-fpack-struct' '-fshort-enums' '-mrelax' '-Wall' '-Wextra' '-Wundef'  '-B' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560' '-c' '-std=gnu99' '-v' '-MD' '-MP' '-MF' 'main.d' '-MT' 'main.d' '-MT' 'main.o' '-o' 'main.o' '-specs=device-specs/specs-atmega2560' '-mmcu=avr6'
         e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/as.exe -mmcu=avr6 --mlink-relax -mno-skip-bug -o main.o C:\Users\gothi\AppData\Local\Temp\ccvaSiXr.s
        COMPILER_PATH=E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../libexec/gcc/avr/5.4.0/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../libexec/gcc/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/
        LIBRARY_PATH=E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/avr6/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/avr6/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/lib/avr6/;E:/ATMEL/7.0/Packs/atmel/ATmega_DFP/1.3.300/gcc/dev/atmega2560/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/;e:/atmel/7.0/toolchain/avr8/avr8-gnu-toolchain/bin/../lib/gcc/avr/5.4.0/../../../../avr/lib/
        COLLECT_GCC_OPTIONS='-funsigned-char' '-funsigned-bitfields' '-D' 'NDEBUG' '-I' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\include' '-I' '../../ATMEGA2560/Release/headers' '-I' '../../ATMEGA2560/Release' '-O3' '-ffunction-sections' '-fdata-sections' '-fpack-struct' '-fshort-enums' '-mrelax' '-Wall' '-Wextra' '-Wundef'  '-B' 'E:\ATMEL\7.0\Packs\atmel\ATmega_DFP\1.3.300\gcc\dev\atmega2560' '-c' '-std=gnu99' '-v' '-MD' '-MP' '-MF' 'main.d' '-MT' 'main.d' '-MT' 'main.o' '-o' 'main.o' '-specs=device-specs/specs-atmega2560' '-mmcu=avr6'
        main.o: In function `main':
C:\Users\USER\Documents\Atmel Studio\7.0\Drone\Drone\Release\main.c(1,1): error: undefined reference to `function_1'
collect2.exe(0,0): error: ld returned 1 exit status
        make: *** [Drone.elf] Error 1
C:\Users\USER\Documents\Atmel Studio\7.0\Drone\Drone\Release\Makefile(106,1): error: recipe for target 'Drone.elf' failed
Done building project "Drone.cproj" -- FAILED.

Build FAILED.
========== Build: 1 succeeded or up-to-date, 1 failed, 0 skipped ==========
答案

也许这只是一个错字，但您说您的静态库具有结构：

ATMEGA2560
|-headers
| |-IO.h
|-source
| |-IO.c
|-ATMEGA2560.h

但是您引用的是其中包含Release文件夹的目录，例如，

ATMEGA2560
|-Release
| |-headers
| | |-IO.h
| |-source
| | |-IO.c
| |-ATMEGA2560.h

此外，还有avr / io.h，来自AVR libc库和您的IO.h。过去，我在使用Atmel Studio时遇到问题，无法分辨adc.h和ADC.h之类的文件之间的区别。尝试将您的ATMEGA2560标头IO.h重命名为其他名称（如果可以的话），也许可以解决您的问题。

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