topic S32k314 I2C in S32K

S32k314 I2C

anoop_r — Wed, 24 May 2023 18:03:31 GMT

Hi,

We are using a platform that has an S32K314 controller and we are trying to bring up the I2C, for that, we have used the example "I2c_IP_LPI2C_Transfer_S32K312" as a reference and ported the codes to our platform.

I have connected an I2C gyro to the S32k314 I2C channel 0.

I have configured the slave address in the mex file and I tried using the API "Lpi2c_Ip_MasterSendData" to write into a register.

In the "Lpi2c_Ip_MasterSendData" API I have filled the txbuffer zeroth location with the reg address and the first location with the data to be written into the register.

I have analyzed the bus transition through an I2C analyzer and there is no data being sent through the bus and I am getting a NACK response.

Is there anything wrong with the way I am using the I2C write API?

Regards

Anoop

Re: S32k314 I2C

PetrS — Thu, 25 May 2023 06:51:36 GMT

Hi,

the Lpi2c_Ip_MasterSendData usage looks correct. Can you share analyzer screenshot?
It looks master is sending slave address but it is not ACKed, is that what you see?
Do you have pull-up resistors on both I2C lines?

BR, Petr

Re: S32k314 I2C

anoop_r — Tue, 30 May 2023 05:01:07 GMT

Hi PetrS,

Sorry for the delay in response,

I have tested the I2C with a different Gryo slave and it is now working.

For reading the I2c I have written the register in blocking mode and tried to read it in nonblocking mode.

Sharing the snapshots of the data written and read from the register, PFA.

Regards

Anoop