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qep电路测出的位置和速度无法显示



我用的是f28335的板子,在上面跑ti公司的qep测速和测位置的例程,速度和位置测量无法显示???给的例程是虚拟的qep电路,在这之前我应经正确连线,运行前为

运行后refresh,所有的值全变成零了

即使重新涮新也不行