/challenges-projects/design-challenges/enchanted-objects/b/blog/posts/1958-turntable-from-the-black-forest---15-sama5d4-blinkyI&#39;ve done many attempts to build and execute my own C program on the atmel sama5d4 xplained ultra board. Thanks to the tutorial on mikrocontroller-software.de , I was able to cross-compile and run my first binary (see post 13: Breakthrough ...en-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/enchanted-objects/b/blog/posts/1958-turntable-from-the-black-forest---15-sama5d4-blinkyWed, 13 May 2015 09:58:58 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e50382db-9a40-4931-bafc-162280e08acbJan Cumps1<p>While experimenting, I discovered that the whole example also works with a small subset of the code,</p><p>without the I/O handle exports etc...</p><p>&nbsp;</p><p>[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&amp;text=class+LinuxFile+%7B%0Aprivate%3A%0A++++int+m_Handle%3B%0A%0A%0A++++%2F*%0A+++++*+Linux+File+Handling+to+acces+devices+via+filesystem%0A+++++*%2F%0Apublic%3A%0A++++LinuxFile%28const+char+*pFile%2C+int+flags+%3D+O_RDWR%29+%7B%0A++++++++m_Handle+%3D+open%28pFile%2C+flags%29%3B%0A++++%7D%0A%0A%0A++++%7ELinuxFile%28%29+%7B%0A++++++++if+%28m_Handle+%21%3D+-1%29%0A++++++++++++close%28m_Handle%29%3B%0A++++%7D%0A%0A%0A++++size_t+Write%28const+void+*pBuffer%2C+size_t+size%29+%7B%0A++++++++return+write%28m_Handle%2C+pBuffer%2C+size%29%3B%0A++++%7D%0A%0A%0A++++size_t+Read%28void+*pBuffer%2C+size_t+size%29+%7B%0A++++++++return+read%28m_Handle%2C+pBuffer%2C+size%29%3B%0A++++%7D%0A%0A%0A++++size_t+Write%28const+char+*pText%29+%7B%0A++++++++return+Write%28pText%2C+strlen%28pText%29%29%3B%0A++++%7D%0A%0A%0A++++size_t+Write%28int+number%29+%7B%0A++++++++char+szNum%5B32%5D%3B%0A++++++++snprintf%28szNum%2C+sizeof%28szNum%29%2C+%22%25d%22%2C+number%29%3B%0A++++++++return+Write%28szNum%29%3B%0A++++%7D%0A%7D%3B%0A%0A%0A%0A%0Aint+main%28%29+%7B%0A%0A%0A++++bool+on+%3D+true%3B%0A++++for+%28%3B%3B%29%0A++++%7B%0A++++++++on+%3D+%21on%3B%0A%0A%0A++++++++if%28true%3D%3Don%29%0A++++++++%7B%0A++++++++LinuxFile%28%22%2Fsys%2Fclass%2Fleds%2Fd8%2Fbrightness%22%2C%0A++++++++++++++++O_WRONLY%29.Write%28%221%22%29%3B%0A++++++++%7D%0A++++++++else%0A++++++++%7B%0A++++++++++++LinuxFile%28%22%2Fsys%2Fclass%2Fleds%2Fd8%2Fbrightness%22%2C%0A++++++++++++++++++++++++++++O_WRONLY%29.Write%28%220%22%29%3B%0A++++++++%7D%0A++++++++%2F*%0A+++++++++*++%2F%2F+With+this+sleep%281%29+command+the+task+sleeps+1+second+and+wake+then.+This+is+not+a+good+solution+but+for+this+example+ok%0A+++++++++*%2F%0A++++++++++++sleep%281%29%3B%0A++++%7D%0A%0A%0A++++return+0%3B%0A%7D]</p><div></div><p>&nbsp;</p><p>I&#39;m continuing my exercise to find out if I&#39;m breaking linux rules, or if I don&#39;t fully understand why the example is doing exports.</p><img src="https://community.element14.com/aggbug?PostID=20813&AppID=117&AppType=Weblog&ContentType=0" width="1" height="1">