包含了在TMS320F28335环境下，产生1kHz方波输出的源程序，程序内每一步有详细注释，可以据此产生任意频率PWM，或烧写到FLASH中。-Contains the TMS320F28335 environment, the production of 1kHz square wave output source, every step of the program has a detailed note, which can produce any frequency PWM, or p