MKE02Z64 I2C issue

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MKE02Z64 I2C issue

Contributor II


I'm working on a project that use MKE02Z64VLC4 MCU and I2C0 bus as master to communicate with two devices.

I'm using MCUXpresso Software Development Kit Rev. 2.6.0 and I2C_MasterTransferNonBlocking.

What I see is that I2C seems to be a little unstable. I am making an heavy use of I2C.

What I see is that I2C works for a while at startup; but after some seconds the "I2C_MasterTransferNonBlocking" routine is getting "kStatus_I2C_Busy" result.

I tried to debug a little and I see that the cause is into "I2C_MasterStart" function; the first if statement of this function is true and then I get "kStatus_I2C_Busy" result:

/* Return an error if the bus is already in use. */
if (0U != (statusFlags & (uint32_t)kI2C_BusBusyFlag))
    result = kStatus_I2C_Busy;

I tried to search for some example of I2C Master in interrupt with error handling but I can not find something.

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NXP TechSupport
NXP TechSupport

Hi Davide,

It seems there is no example shows how to deal with it.  kStatus_I2C_Busy is caused by I2Cx->S.BUSY register bit. When busy, it is set by hardware, which means a start condition is detected on bus. It is cleared when a stop condition is detected on bus. Please use a oscilloscope to check the waveform. I guess a previous communication sequence was not ended correctly.



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