topic LPI2C master NACK Issue in S32K

LPI2C master NACK Issue

RehabSoliman — Thu, 15 Sep 2022 07:51:52 GMT

Hi, I'm trying to send Frame ID to the slave and then read request to read the data

it sends the frame id but in the read I have an issue that the operation return received NACK and there is no data send to the master.

I couldn't know how to solve this issue

that is the code:

enuRequestStatus = LPI2C_DRV_MasterSendDataBlocking(INST_LPI2C0,FrameID,1,false,OSIF_WAIT_FOREVER);
if( enuRequestStatus == STATUS_SUCCESS)
{
// send blocking read request (with STOP condition)
enuRequestStatus = LPI2C_DRV_MasterReceiveDataBlocking(INST_LPI2C0,pI2cData,u8DataSize, true,OSIF_WAIT_FOREVER);
}

could you help me in this issue please ?

Re: LPI2C master NACK Issue

PetrS — Fri, 16 Sep 2022 12:13:43 GMT

Hi,

the code used should be right, so most probably there will be issue on slave side. Can you share screenshot of bus signal?
Who is a slave? Another S32K? Then what code is used?

BR, Petr

Re: LPI2C master NACK Issue

RehabSoliman — Sat, 24 Sep 2022 16:04:12 GMT

yes, the problem on the testing way I used Aardvark as slave so it can't handle write and read together

but when I use another S32K142 EVB It work well

thanks for your support.

regards,

Rehab