topic Re: Interfacing S32K144 with an external EEPROM using I2C in S32K

Interfacing S32K144 with an external EEPROM using I2C

Rambo1310 — Mon, 31 Jul 2023 03:53:47 GMT

Interfacing EEPROM BR24T512-3AM with S32K144. I have tried to establish the interface by writing a value to a particular address and then reading it back from the same address.

However I'm getting the status while sending and receiving data over I2C as "STATUS_I2C_RECEIVED_NACK".

PFA the sample code for this task. Kindly review and help sort out the issue.

Thanks

Re: Interfacing S32K144 with an external EEPROM using I2C

danielmartynek — Mon, 31 Jul 2023 07:42:22 GMT

Hi @Rambo1310,

Can you menasure the bus with an oscilloscope?

If there is no ACK, check the address.

Thanks,

BR, Daniel

Re: Interfacing S32K144 with an external EEPROM using I2C

Rambo1310 — Mon, 31 Jul 2023 08:36:54 GMT

The 7 bit address is 0x50.
The read/write bit i.e the 8th bit is 0 for writing and 1 for reading.
I have implemented the logic in the respective function.

Re: Interfacing S32K144 with an external EEPROM using I2C

Rambo1310 — Mon, 31 Jul 2023 08:41:19 GMT

The write and read cycle as per datasheet has been attached for your reference. I don't understand where am going wrong with this. Is the I2C peripheral initialized and APIs used correctly?

Re: Interfacing S32K144 with an external EEPROM using I2C

danielmartynek — Mon, 31 Jul 2023 08:54:46 GMT

There is no need to initialize the driver and to set the address in every function, do it just once.

The driver changes the R/W bit in the address depending on the LPI2C API used:

LPI2C_DRV_MasterSendDataBlocking()

LPI2C_DRV_MasterReceiveDataBlocking()

Don't change the address using the LPI2C_DRV_MasterSetSlaveAddr() function.

It is important to measure the bus using an oscilloscope or a logic analyzer to make sure the signals are correct.

Regards,

Daniel

Re: Interfacing S32K144 with an external EEPROM using I2C

Rambo1310 — Wed, 02 Aug 2023 12:14:42 GMT

I made these changes but didn't work. Same status is returned.

I even tried changing the component to I2C_pal from LPI2C but still no luck am not able to write and read the desired data.

PFA the modified code.

Re: Interfacing S32K144 with an external EEPROM using I2C

danielmartynek — Thu, 03 Aug 2023 08:38:07 GMT

I don't see any obvious issue in the code.

As I said, it is necessary to scope the bus, and compare it with the expected signal as per the datasheet of the EEPROM.

Regards,

Daniel