/products/devtools/single-board-computers/riotboard/b/blog/posts/riotboard-and-ultrasonic-sensor-hc-sr04In this small guide I will demonstrate how to integrate Riotboard with Ultrasonic sensor HC-SR04 . Step1: export ARCH &amp; CROSS_COMPILE to environment path. in my case its like below, yours might be different.$ export ARCH=arm$...en-USTelligent Community 12https://community.element14.com/products/devtools/single-board-computers/riotboard/b/blog/posts/riotboard-and-ultrasonic-sensor-hc-sr04Tue, 25 Apr 2017 07:30:58 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:69c08515-89d8-44e5-bafb-e7f8fae9feeesalih.mutlu@gmail.com0<p>Hi,</p><p>A very nice tutorial. I have some questions:</p><p>&nbsp;</p><p>1) In driver, you set gpios as input or output, why do you export also in user space?</p><p>2) If I want that &quot;<strong>devmem 0x20E009C w 0x5</strong>&quot; command in driver, what should I do?</p><p>3) If I want to build it into the kernel statically, is there anything that I have to do?</p><p>&nbsp;</p><p>Thanks</p><img src="https://community.element14.com/aggbug?PostID=1289&AppID=90&AppType=Weblog&ContentType=0" width="1" height="1">