linux - Linux 下的 FTDI TTL

Question

为了向外部设备发送命令，我使用了 FTDI 的 TTL-232R-3V3 线。我想在那里设定通往高或低的具体途径。不需要奇偶校验或停止位。

我的操作系统是 Ubuntu Linux 13.04。

我想开发一个Java或C应用程序，它可以发送这些命令。但是当我尝试安装线路驱动程序时出现错误:

我正在关注this指导，我决定安装 D2XX 驱动程序。我认为我已经成功安装了步骤 2.1 中所述的共享对象和静态库，无论如何我没有收到任何错误消息。

但是，当我尝试编译示例代码(如步骤 3 中所述)时，执行 make -B 命令时得到以下输出。

for n in BitMode EEPROM/erase EEPROM/read EEPROM/write EEPROM/user/read EEPROM/user/size EEPROM/user/write Events LargeRead MultiThread SetVIDPID Simple Timeouts ; do make -C $n || exit 1; done
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/BitMode'
gcc main.c -o bitmode -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib  
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/BitMode'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/erase'
gcc main.c -o erase -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/erase'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/read'
gcc main.c -o read -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/read'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/write'
gcc main.c -o write -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/write'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/user/read'
gcc main.c -o readua -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/user/read'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/user/size'
gcc main.c -o sizeua -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/user/size'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/user/write'
gcc main.c -o writeua -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/EEPROM/user/write'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/Events'
gcc main.c -o events -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/Events'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/LargeRead'
gcc main.c -o largeread -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/LargeRead'
make[1]: Betrete Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/MultiThread'
gcc main.c -o multi -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples/MultiThread'
gcc main.c -o multi -Wall -Wextra -L. -lftd2xx -Wl,-rpath /usr/local/lib
/usr/bin/ld: /tmp/ccoAsrRg.o: undefined reference to symbol     'pthread_create@@GLIBC_2.2.5'
/usr/bin/ld: note: 'pthread_create@@GLIBC_2.2.5' is defined in DSO /lib/x86_64-linux-    gnu/libpthread.so.0 so try adding it to the linker command line
/lib/x86_64-linux-gnu/libpthread.so.0: could not read symbols: Ungültiger Vorgang
collect2: Fehler: ld gab 1 als Ende-Status zurück
make[1]: *** [multi] Fehler 1
make[1]: Verlasse Verzeichnis '/home/robin/Dokumente/Java/Stepper/lib/release/examples    /MultiThread'
make: *** [subdirs] Fehler 1

如何修复该错误？有人使用过这条线和 Linux 吗？提前致谢!

Answer 1

某些示例或其依赖项之一正在使用 pthreads，但 Makefile 未为此进行配置。

编辑 Makefile 并将 -pthread 添加到 CFLAGS 和 LDFLAGS。您可以通过添加行来做到这一点

CFLAGS += -pthread
LDFLAGS += -pthread

但是，您可能根本不需要 D2XX 库。 FTDI 内核驱动程序应创建一个 /dev/ttyUSBn 设备，您可以像“真正的”串行端口一样使用它。