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How to get gpio value when I change it.

Question asked by 思健 蔡 on Apr 18, 2016
Latest reply on Apr 20, 2016 by CarlosCasillas

In imx6ul , I use gpio 19 for test , if I make the dir to out , and then I echo 1 or 0 to value , I can get the correct status by multimeter , but how can I get the gpio value in the use space ? And may I read the register value ? Thanks a lot.