基于全志A40i进行交叉编译测试

环境：Unbuntu20.4LTS
交叉编译工具链：arm-linux-gnueabihf-gcc
软件：VsCode

编译环境搭建及测试

下载交叉编译器

工具地址：https://releases.linaro.org/components/toolchain/binaries/
比如gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf.tar.xz
完整路径：
https://releases.linaro.org/components/toolchain/binaries/7.5-2019.12/arm-linux-gnueabihf/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf.tar.xz

安装

先解压

1 2	xz -d gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf.tar.xz tar -vxf gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf.tar

将当前的bin目录添加到环境变量中，使用命令pwd

1 2	root@xiaobai-virtual-machine:/home/xiaobai/Work/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin# pwd /home/xiaobai/Work/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin

1	export PATH=/home/xiaobai/Work/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin:$PATH

环境变量生效

1	source ~/.bashrc

查看设置的路径，命令echo $PATH
顺便输入arm然后按按tab键看看有没有补齐

使用

输入命令arm-linux-gnueabihf-gcc -v，查看是否出现版本信息

Using built-in specs.
COLLECT_GCC=arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/home/xiaobai/Work/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../libexec/gcc/arm-linux-gnueabihf/7.5.0/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: '/home/tcwg-buildslave/workspace/tcwg-make-release_1/snapshots/gcc.git~linaro-7.5-2019.12/configure' SHELL=/bin/bash --with-mpc=/home/tcwg-buildslave/workspace/tcwg-make-release_1/_build/builds/destdir/x86_64-unknown-linux-gnu --with-mpfr=/home/tcwg-buildslave/workspace/tcwg-make-release_1/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gmp=/home/tcwg-buildslave/workspace/tcwg-make-release_1/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gnu-as --with-gnu-ld --disable-libmudflap --enable-lto --enable-shared --without-included-gettext --enable-nls --with-system-zlib --disable-sjlj-exceptions --enable-gnu-unique-object --enable-linker-build-id --disable-libstdcxx-pch --enable-c99 --enable-clocale=gnu --enable-libstdcxx-debug --enable-long-long --with-cloog=no --with-ppl=no --with-isl=no --disable-multilib --with-float=hard --with-fpu=vfpv3-d16 --with-mode=thumb --with-tune=cortex-a9 --with-arch=armv7-a --enable-threads=posix --enable-multiarch --enable-libstdcxx-time=yes --enable-gnu-indirect-function --with-build-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release_1/_build/sysroots/arm-linux-gnueabihf --with-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release_1/_build/builds/destdir/x86_64-unknown-linux-gnu/arm-linux-gnueabihf/libc --enable-checking=release --disable-bootstrap --enable-languages=c,c++,fortran,lto --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-linux-gnueabihf --prefix=/home/tcwg-buildslave/workspace/tcwg-make-release_1/_build/builds/destdir/x86_64-unknown-linux-gnu
Thread model: posix
gcc version 7.5.0 (Linaro GCC 7.5-2019.12)

在a40i开发板上配置sftp用于文件传输，将编译完成的可执行文件传到a40i开发板上运行

在Unbuntu20下编写一个helloworld.c文件

通过其他教程学习了一下Makefile文件的构成及简单实现，make编译得到可执行文件main

将main文件通过sftp复制到a40i开发板root目录下，修改运行权限并运行测试

利用上述方式控制LED闪烁

linux系统下一切皆文件

编写gpio_test.c文件，这里参考了文章https://www.jianshu.com/p/e5ecd92c0787

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
char *GPIO_PATH = "/sys/class/gpio/gpio43/value";
int main(int argc, char *argv[])
{
    int res = 0;
    int fd;
    char *path;
    
    printf("Gpio test demo\n");
    if(argc >= 2)
    {
        path = argv[1];
    }
    else
    {
        path = GPIO_PATH;
    }
    
    fd = open(path, O_WRONLY);
    if(fd<0)
    {
        printf("Failed to Open gpio %s/n", path);
        exit(1);
    }
    while(1)
    {
        write(fd, "1", 1);
        sleep(1);
        write(fd, "0", 1);
        sleep(1);
    }
    close(fd);
}

编写Makefile文件进行编译

将生成的可执行文件gpio_flash复制到a40i开发板目录中，不加任何参数运行可以看到a40i核心板上的LED闪烁

带参数可以换一个gpio进行控制