topic LPI2C in S32K

LPI2C

LzdOo — Wed, 09 Jul 2025 06:47:16 GMT

I want to use the LPI2C module of S32K144 as the Master to communicate with the Slave and achieve register reading and writing. As shown in the configuration and interface diagram, it seems that they are not effective. Could you please tell me which step is missing? (The Slave address is correct.)

Re: LPI2C

PetrS — Wed, 09 Jul 2025 11:30:25 GMT

Hi,

the setting looks normal and code is almost right. If using non-blocking function you should check for transfer finish, before other Send/Receive is called. Non-blocking operations will initiate the transfer and return STATUS_SUCCESS, but the module is still busy with the transfer and another transfer can't be initiated until the current transfer is complete. The application can check the status of the current transfer by calling LPI2C_DRV_MasterGetTransferStatus().
Or use blocking function instead.

BR, Petr

Re: LPI2C

LzdOo — Thu, 10 Jul 2025 02:08:51 GMT

Hi, Petr

The code has been modified as follows, but the SDA and SCL waveforms are incorrect. Please help me figure out what the reason is.

Re: LPI2C

PetrS — Thu, 10 Jul 2025 10:42:26 GMT

Hi,

but you did not implement what was written. Modify code additionally to either put Transfer status testing after MasterSendData function or use MasterSendDataBlocking there.

BR, Petr