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使用树莓派做AVR芯片的下载器

  1. 安装avrdude
  2. 更改配置文件，查找gpio将对应的linuxgpio中相关注释的内容删除
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    #This programmer bitbangs GPIO lines using the Linux sysfs GPIO interface
    #
    #To enable it set the configuration below to match the GPIO lines connected to the
    #relevant ISP header pins and uncomment the entry definition. In case you don't
    #have the required permissions to edit this system wide config file put the
    #entry in a separate <your name>.conf file and use it with -C+<your name>.conf
    #on the command line.
    #
    #To check if your avrdude build has support for the linuxgpio programmer compiled in,
    #use -c?type on the command line and look for linuxgpio in the list. If it's not available
    #you need pass the --enable-linuxgpio=yes option to configure and recompile avrdude.
    #
    programmer
      id    = "linuxgpio";
      desc  = "Use the Linux sysfs interface to bitbang GPIO lines";
      type  = "linuxgpio";
      reset = 16;
      sck   = 24;
      mosi  = 23;
      miso  = 18;
    ;

note:avrdude配置文件中的IO编号对应的芯片上的管脚编号BCM#，而不是树莓派提供的排针接口的编号

  1. 使用avrdude下载程序时，选择下载器linuxgpio
  2. 在使用过程中，常会遇到Can't export GPIO 16, already exported/busy?: Device or resource busy的错误，原因尚未搞清楚，可以用如下指令恢复
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    sudo echo 16 > /sys/class/gpio/unexport