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最近发现由于自己不良的安装软件的习惯，shell的PATH路径包含了很多冗余的项。这里使用shell命令去除PATH的冗余项。export PATH=$(echo $PATH | sed 's/:/\n/g' | sort | uniq | tr -s '\n' ':' | sed 's/:$//g')上面的代码可以去除linux环境变量中的重复项。 最近查看环境变量时，发现PATH中包含了很多... 阅读全文
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Add a syscall to kernel and replace linux kernel of RPi.Prepare: Cross compilerLinux Kernel for RPiReference: Official guideFirstly, get the latest kernel: git clone https://github.com/raspberrypi/... 阅读全文
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In this article, I will use three asynchronous conferencing--select, poll and epoll on serial port to transmit data between PC and Raspberry pi.OutlineCharacter device file of serial portNaive serial ... 阅读全文
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Opps, my computer system was broken again... Let's repire it.IntroductionThe system of my PC is broken. I could enter the UEFI setting. So that means I coud start my PC using USB flash drive. But firs... 阅读全文
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A few days ago, I have tried to write bare medal program but failed. Now I find that the main mistake is that I have mistake the address of GPIO of BCM 2835(Raspberry Pi 1 for which the sample code is... 阅读全文