From: Yegor Yefremov <yegorslists-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
To: Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: PCA9564: "bus is not idle" issue
Date: Thu, 18 Mar 2010 10:01:22 +0100 [thread overview]
Message-ID: <f69abfc31003180201m5c5e167enf8256c4843e0c6ba@mail.gmail.com> (raw)
In-Reply-To: <f69abfc31003170826j18fa0fddq1c46b8bcebf75c57-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
>>> Could this be the reason for such behavior? Any idea?
>>
>> Can you set the algo-module parameter i2c_debug to 3 and post the log for the
>> transfer that failed, please?
>
> I've increased i2c_debug to 3 and now I get a lot of debug messages,
> but the error doesn't occur. These debug messages seem to influence
> the timing.
If I don't redirect syslog to a remote host I get i2c fail. So here you are:
=== START
STATE is 0x08
=== SLAVE ADDRESS 0x68+W=0xd0
STATE is 0x18
=== WRITE 0x00
STATE is 0x28
=== REPEATED START
STATE is 0x10
=== SLAVE ADDRESS 0x68+R=0xd1
STATE is 0x40
STATE is 0x50
=== READ 0x27 ACK
STATE is 0x50
=== READ 0x55 ACK
STATE is 0x50
=== READ 0x08 ACK
STATE is 0x50
=== READ 0x05 ACK
STATE is 0x50
=== READ 0x18 ACK
STATE is 0x50
=== READ 0x83 ACK
STATE is 0x58
=== READ 0x10 NACK
=== STOP
}}} transfered 2/2 messages. status is 0x58. control is 0x55
i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
i2c i2c-0: master_xfer[1] R, addr=0x68, len=7
{{{ XFER 2 messages
[00] WR 1 bytes to 0x68 [0xd0, 0x00]
[01] RD 7 bytes from 0x68 [0xd1, ...]
STATE is 0xf8
=== START
STATE is 0x08
=== SLAVE ADDRESS 0x68+W=0xd0
STATE is 0x18
=== WRITE 0x00
STATE is 0x28
=== REPEATED START
STATE is 0x10
=== SLAVE ADDRESS 0x68+R=0xd1
STATE is 0x40
STATE is 0x50
=== READ 0x27 ACK
STATE is 0x50
=== READ 0x55 ACK
STATE is 0x50
=== READ 0x08 ACK
STATE is 0x50
=== READ 0x05 ACK
STATE is 0x50
=== READ 0x18 ACK
STATE is 0x50
=== READ 0x83 ACK
STATE is 0x58
=== READ 0x10 NACK
=== STOP
}}} transfered 2/2 messages. status is 0x58. control is 0x55
i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
i2c i2c-0: master_xfer[1] R, addr=0x68, len=7
{{{ XFER 2 messages
[00] WR 1 bytes to 0x68 [0xd0, 0x00]
[01] RD 7 bytes from 0x68 [0xd1, ...]
STATE is 0xf8
=== START
STATE is 0x08
=== SLAVE ADDRESS 0x68+W=0xd0
STATE is 0x18
=== WRITE 0x00
STATE is 0x28
=== REPEATED START
STATE is 0x10
=== SLAVE ADDRESS 0x68+R=0xd1
STATE is 0x40
STATE is 0x50
=== READ 0x27 ACK
STATE is 0x50
=== READ 0x55 ACK
STATE is 0x50
=== READ 0x08 ACK
STATE is 0x50
=== READ 0x05 ACK
STATE is 0x50
=== READ 0x18 ACK
STATE is 0x50
=== READ 0x83 ACK
STATE is 0x58
=== READ 0x10 NACK
=== STOP
}}} transfered 2/2 messages. status is 0x58. control is 0x55
i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
i2c i2c-0: master_xfer[1] R, addr=0x68, len=7
{{{ XFER 2 messages
[00] WR 1 bytes to 0x68 [0xd0, 0x00]
[01] RD 7 bytes from 0x68 [0xd1, ...]
STATE is 0xf8
=== START
STATE is 0x08
=== SLAVE ADDRESS 0x68+W=0xd0
STATE is 0x18
=== WRITE 0x00
STATE is 0x28
=== REPEATED START
STATE is 0x10
=== SLAVE ADDRESS 0x68+R=0xd1
STATE is 0x40
STATE is 0x50
=== READ 0x27 ACK
STATE is 0x50
=== READ 0x55 ACK
STATE is 0x50
=== READ 0x08 ACK
STATE is 0x50
=== READ 0x05 ACK
}}} transfered 1/2 messages. status is 0x50. control is 0xcd
rtc-ds1307 0-0068: read error -121
i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
i2c i2c-0: master_xfer[1] R, addr=0x68, len=7
i2c i2c-0: bus is not idle. status is 0x50
rtc-ds1307 0-0068: read error -11
i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
i2c i2c-0: master_xfer[1] R, addr=0x68, len=7
i2c i2c-0: bus is not idle. status is 0x50
As far as I can tell the last transaction lacks "=== STOP" state.
Regards,
Yegor
next prev parent reply other threads:[~2010-03-18 9:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-17 12:59 PCA9564: "bus is not idle" issue Yegor Yefremov
[not found] ` <f69abfc31003170559y3c0a5a6fi91c1ae7692700c66-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-03-17 13:52 ` Wolfram Sang
[not found] ` <20100317135223.GD4153-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-17 15:26 ` Yegor Yefremov
[not found] ` <f69abfc31003170826j18fa0fddq1c46b8bcebf75c57-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-03-18 9:01 ` Yegor Yefremov [this message]
[not found] ` <f69abfc31003180201m5c5e167enf8256c4843e0c6ba-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-03-18 9:19 ` Wolfram Sang
[not found] ` <20100318091917.GA27165-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-18 9:51 ` Yegor Yefremov
[not found] ` <f69abfc31003180251q53c96f8chc6b96d29c2ceec6d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-03-29 14:31 ` Jean Delvare
[not found] ` <20100329163149.41df7f10-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-03-30 13:16 ` Yegor Yefremov
2010-04-03 16:29 ` Wolfram Sang
[not found] ` <20100403162939.GA2190-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-04-03 18:23 ` Jean Delvare
[not found] ` <20100403202329.3bdb407c-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-04-04 3:29 ` Wolfram Sang
[not found] ` <20100404032929.GA12800-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-04-04 11:00 ` Yegor Yefremov
[not found] ` <t2zf69abfc31004040400wc3330285pe5d4602d31e0a52b-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-04-06 7:48 ` Yegor Yefremov
[not found] ` <j2pf69abfc31004060048z1b9500e1g9e12fb5bd794dc4a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-04-06 7:52 ` Wolfram Sang
[not found] ` <20100406075208.GA5102-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-04-06 8:04 ` Yegor Yefremov
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