LPC3250FET296: i2c bus hang

kimran — Mon, 15 Jan 2018 08:52:36 GMT

Hi ,

I am using a custom board based on LPC3250FET296 . It is running Linux 3.18 kernel.

I am seeing i2c bus hangs with the following messages:

Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: Master timed out. stat = 2a60, cntrl = 000e. Resetting master...
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus busy. Slave addr = 40, cntrl = 0, stat = 2a60
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus is still active after xfer. Reset it...
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus is still active after xfer. Reset it...
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: Master timed out. stat = 2a60, cntrl = 000e. Resetting master...
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus busy. Slave addr = 40, cntrl = 0, stat = 2a60
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus is still active after xfer. Reset it...
Jan 1 01:43:58 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus is still active after xfer. Reset it...
Jan 1 01:43:59 (none) user.err kernel: i2c-adapter i2c-1: Master timed out. stat = 2a60, cntrl = 000e. Resetting master...
Jan 1 01:43:59 (none) user.err kernel: i2c-adapter i2c-1: PNX4008-I2C1: Bus busy. Slave addr = 41, cntrl = 0, stat = 2a60

After googling a bit I found the following thread:

https://community.nxp.com/thread/316813

This talks about recovering the i2c bus by making the master send 9 clock pulses. I see that some of the i2c controllers have (ST, OMAP etc.) have implemented the recovery mechanism but the recovery mechanism is not implemented for

Philips-IP3204 I2C controllers.

Just wanted to know if someone has tried this out. From my understanding of the data sheet apparently GPIO functionality is not available for SCL pin here.

Re: LPC3250FET296: i2c bus hang

CarlosCasillas — Thu, 18 Jan 2018 22:57:19 GMT

Hi Imran,

As a complementary information regarding the thread that you already found, you could also refer to the following:

https://community.nxp.com/thread/429674

Hope this will be useful for you.

Best regards!

/Carlos

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LPC MicrocontrollersのトピックLPC3250FET296: i2c bus hang

LPC3250FET296: i2c bus hang

Re: LPC3250FET296: i2c bus hang