S32KのトピックRe: about i2c

about i2c

kalajiao — Wed, 18 Aug 2021 08:17:40 GMT

I tried to run the I2C component routines provided by the government. I burned the lPI2C_MASTER_S32k144 official routines on one board, downloaded the LPI2C_slave_S32k144 official routines on another board, and connected PTA3 and PTA2 on two boards.

Shouldn't the routine be for the master to send data to the slave? Why do I look at the data in the Rxbuff on the board where I burned the slave routine and see that the data in the rxbuff is still initialized with 0?

Re: about i2c

danielmartynek — Thu, 19 Aug 2021 09:06:50 GMT

Hi @kalajiao,

Have you scoped the bus?

Can you share the measurement?

Does the Slave device acknowledge the transfer?

If not, what is the address of the Slave?

What address does the Master send?

Thanks,

BR, Daniel

Re: about i2c

kalajiao — Thu, 19 Aug 2021 09:04:21 GMT

I use the official routine ah, I see the master send address is 0x1, slave address is also 0x1, this is configured in the routine. And then my connection is shown here

Re: about i2c

danielmartynek — Fri, 20 Aug 2021 09:19:49 GMT

Hi @kalajiao,

In the master example, the LPI2C sends only one 256byte-long transfer and then it reads 256 bytes from the slave.

The master should start the transfer only once the slave is initialized.

You could add another connection, one GPIO at both sides to inform the master that the slave is ready and only then start the transfers in the master example.

Regards,

Daniel