https://ess-wiki.advantech.com.tw/wiki/index.php?action=history&feed=atom&title=IoTGateway%2FBSP%2FAndroid%2FGettingstarted%2FHow_to_use_I2C 2026-04-04T12:22:07Z Revision history for this page on the wiki MediaWiki 1.28.3 https://ess-wiki.advantech.com.tw/wiki/index.php?title=IoTGateway/BSP/Android/Gettingstarted/How_to_use_I2C&diff=5455&oldid=prev 2017-01-26T07:25:34Z

<p>Created page with &quot;=== Test === Check i2c busses *Usage: i2cdetect [-y] [-a] [-q|-r] I2CBUS [FIRST LAST] &lt;pre&gt;#i2cdetect -l i2c-0 i2c 21a0000.i2c I2C...&quot;</p> <p><b>New page</b></p><div>=== Test ===<br /> <br /> Check i2c busses<br /> <br /> *Usage: i2cdetect [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]<br /> &lt;pre&gt;#i2cdetect -l<br /> i2c-0 i2c 21a0000.i2c I2C adapter<br /> i2c-1 i2c 21a4000.i2c I2C adapter<br /> i2c-2 i2c 21a8000.i2c I2C adapter<br /> &lt;/pre&gt;<br /> <br /> Check devices on i2c-2 bus<br /> &lt;pre&gt;#i2cdetect -y -r 2<br /> 0 1 2 3 4 5 6 7 8 9 a b c d e f<br /> 00: -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 50: UU UU -- -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<br /> 70: -- -- -- -- -- -- UU --<br /> &lt;/pre&gt;<br /> <br /> Dump I2C device register content<br /> <br /> *Usage: i2cdump [-f] [-y] [-r first-last] I2CBUS ADDRESS [MODE [BANK [BANKREG]]]<br /> &lt;pre&gt;# i2cdump -y -f 2 0x76<br /> No size specified (using byte-data access)<br /> 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef<br /> 00: 54 00 80 43 40 40 40 00 00 00 00 00 00 00 ff ff T.?C@@@S........<br /> 10: 85 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff &amp;nbsp;?...............<br /> 20: 00 00 00 18 ff ff ff ff ff ff ff ff ff ff ff ff ...?............<br /> 30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> 40: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> 50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> 60: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> 70: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> 80: 54 00 80 43 40 40 40 53 00 00 00 00 00 00 ff ff T.?C@@@S........<br /> 90: 85 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff &amp;nbsp;?...............<br /> a0: 00 00 00 18 ff ff ff ff ff ff ff ff ff ff ff ff ...?............<br /> b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................<br /> &lt;/pre&gt;<br /> <br /> &lt;br/&gt;Read a single byte<br /> <br /> *Usage: i2cget [-f] [-y] I2CBUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]<br /> &lt;pre&gt;# i2cget -f -y 2 0x76 7<br /> 0x00<br /> &lt;/pre&gt;<br /> <br /> Change its value and verify it<br /> <br /> *Usage: i2cset [-f] [-y] [-m MASK] [-r] I2CBUS CHIP-ADDRESS DATA-ADDRESS [VALUE] ... [MODE]<br /> &lt;pre&gt;# i2cset -f -y 2 0x76 7 0x53<br /> # i2cget -f -y 2 0x76 7<br /> 0x53<br /> &lt;/pre&gt;</div>

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