S32k324 I2C question

[bubububu]

Burn the program of S32k324 into the board of S32k344, initialize I2C, set MCR ->MEN to 1, the data read by MSR ->BBF is 1, and the I2C bus is busy. What is this asking

[danielmartynek]

HI @bubububu,

If either SCL or SDA are low, the I2C bus is no longer considered idle.

Do you use pull-up resistors at the SCL, SDA lines?

Can you monitor the bus with an oscilloscope?

Thank you,

BR, Daniel

[bubububu]

after initialize I2C,Logic analyzer measurement SCL and SDA are high, 

SCL uses PTC7 pin

SDA uses PTC6 pin

 SCL, SDA lines have  pull-up resistors

[danielmartynek]

Are the ports correctly muxed to the LPI2C1 module in MSCRx?

[bubububu]

It is configured according to the diagram above

[danielmartynek]

Please check the MSCR registers in the register view.

Do you use SDK / RTD or your own code?

Can you share the project or the function you use the initialize the module?

Double-check the clock configuration, it should be set precisely to one of the clock options listed in the RM, e.g. Option A, Table 151. Option A - High Performance mode (CORE_CLK @ 160 MHz).

Regards,

Daniel

[bubububu]

Please check the MSCR registers in the register view.

->After the initialization of i2c, MS/CR register state，MSR->BBF bit is 1

Do you use SDK / RTD or your own code?

->Downloaded online through s32ds.exe application

Can you share the project or the function you use the initialize the module?

->Initialize i2c using Lpi2 c_IpMasterInit (1,&I2c_Lpi2 cMasterChannel1)function

The i2c clock configuration is as follows

[danielmartynek]

Hi @bubububu,

I mean the MSCR registers of the two ports in the SIUL2 module.

SIUL_MSCR70 and SIUL_MSCR71.

What RTD version is it? You can find in at the top of any RTD cource file.

It would be better if you could share the project here or via a support ticket.

Regards,

Daniel