采用TMS320LF2407实现电子琴演奏功能，利用了2407的PWM模块，可以演奏7个音阶
文件列表:
E_ORGAN
.......\
.......\cc_build.log
.......\cmd.txt
.......\key.c.bak
.......\key.cmd
.......\key.mak
.......\key.map
.......\key.out
.......\key_1.c
.......\key_1.c.bak
.......\memory.cmd
.......\qing.out
.......\rts2xx.lib
.......\test.map
.......\test.out
.......\vectors.asm
.......\vectors.obj
.......\vectors.txt
.......\vectors1.asm
.......\vectors1.obj
.......\xiaoche1.out
.......\电子琴.txt
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