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【Development Environment Construction】 1. Development environment construction: operating system or virtual machine Ubuntu installation, network service configuration, Tool installation, etc. Tool resources : https://pan.baidu.com/s/1bpakJtP // env/embedded linux software development environment (updated from time to time) Steps to organize : http://blog.csdn.net/sinat_36184075/article/details/71194832 2. Programming basics: cross-compilation usage, Makefile rules, common assembly instructions Cross-compilation tool chain production : http://blog.csdn.net/sinat_36184075/article/details/71195114 Makefile writing : http://blog.csdn.net/sinat_36184075/article/details/54917518 Quick query of assembly instructions : http://blog.csdn.net/sinat_36184075/article/details/55819869 3. Commonly used tools: The use of tools under windows (SourceInsight, SecureCRT, keil, IAR, etc.) The use of tools under linux (tftp, nfs, vi, man manual, basic command line command and grep/find/tar/diff/patch, etc.) // The common tools are easy to use and can be checked by yourself. [ARM9 Embedded System Foundation] 1. GPIO interface 1) Embedded development steps: Programming: mainly .c .h files; Compile: The make command invokes the cross-compilation rules written in the Makefile to compile .bin binary file; Programming: PC parallel port and JTAG connection or PC USB and serial port connection, use the corresponding Tools and commands for programming; Run the test: Command to run or reset the development board to observe the running effect. 2) How to control hardware through GPIO pins: There are 3 kinds of operations for…