MSPM0G3507: I2C Rx, Tx Status check code

Ryan KIM

Part Number: MSPM0G3507

Tool/software:

Hello Guru,

I'd like to check I2C status. So, I referred TRM.

Declare variables as global variable and access the structure.

gStatus1 = (I2C_INST -> SLAVE.SSR) & (1 << 0); // Rx request check

gStatus2 = (I2C_INST -> SLAVE.SSR) & (1 << 1); // Tx request check

But it doesn't work.

Do you know how to access TREQ, RREQ(in SSR)? or another way to check Rx, Tx request?

0 Bruce McKenney 9 months ago

Guru 101015 points

What is it that doesn't work?

TREQ and RREQ are only set under certain conditions (as described above). Are you maybe looking for RXMODE/TXMODE?

0 Ryan KIM 9 months ago in reply to Bruce McKenney

As you know, Master sends Read/Write command to slave.

Is it possible check the command through TREQ, RREQ?

I think RXMODE, TXMODE similar with TREQ, RREQ. But I'd like to check the command thru TREQ, RREQ

+1 Bruce McKenney 9 months ago in reply to Ryan KIM

Guru 101015 points

RREQ/TREQ are not the same as RXMODE/TXMODE.

What is it you want to accomplish? Put another way: What do you intend to do with this information?

0 Ryan KIM 9 months ago in reply to Bruce McKenney

I just want to know master's command(Read/Write) with slave device

I think RXMODE/TXMODE is suitable function for me.

+1 Helic Chi 9 months ago in reply to Ryan KIM

In I2C start interrupt, this start condition is triggered after address matched.

So there still some time to complete the 8th bit received (Read/Write command bit)

Please add some delay to read this register.

Or you can start a timer counter and using timer interrupt to read this TREQ/RREQ.

This delay time depending on I2C speed and MSPM0 interrupt enter/exit time.

You can set a GPIO in I2C start interrupt to calculate the delay time in free run debug mode.

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