Thanks a lot for your reply,
I clearly understand when I reading some paper about beagle board i2c.
So I changed i2c bus from 4 to 3.
When I tried to "i2cdetect -r (number)" I have some trouble.
if I write *i2cdetect -r 1 *
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU UU UU UU -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
if I write *i2cdetect -r 2 *
it gives me like that.
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- UU -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
if I write *i2cdetect -r 3*
it gives me some error.
00: [ 1047.269256] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.297790] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.321289] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.336639] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.351989] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.374084] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.397430] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.420715] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.433746] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.459899] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.483276] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.506652] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.519683] i2c_omap i2c_omap.3: Arbitration lost
--
10: [ 1047.543640] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.554473] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.574829] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.585754] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.606048] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.617095] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.627838] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.652984] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.664093] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.684265] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.707824] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.731109] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.754699] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.777832] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.801544] i2c_omap i2c_omap.3: Arbitration lost
-- [ 1047.824737] i2c_omap i2c_omap.3: Arbitration lost
--
So I do't know why it is working like this.
I can't use i2c-3 .
How should I do to fix it ?
19 Haziran 2015 Cuma 19:58:10 UTC+3 tarihinde lisarden yazdı:
>
> i2c4 is for PMIC only. You can't use it. ever
>
> 2015-06-19 17:44 GMT+03:00 Erkan Güzeler <[email protected]
> <javascript:>>:
>
>> Hi everyone,
>>
>> I'm working on Beagleboard XM RevC2 and I need to read I2C4. So I can't
>> see anything in */sys/bus/i2c/devices/i2c-(1-2-3) * bu I2C4 has not in
>> there. Is there a way to learn it ?
>>
>> Thanks a lot.
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>
>
>
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