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关于seed-exp430F5529 v1.0 开发板液晶的问题

Other Parts Discussed in Thread: TPS75105

开发板:seed-exp430F5529  v1.0

对于这个液晶 102*64, 网上的资料说改液晶带背光,但是我在出厂程序中,有调节backlight 的选项,我就调节wheel旋钮,没有发现背光的变化?

wenku.baidu.com/.../6fce6f7701f69e31433294d5.html

说该液晶带背光的功能?