MSP430I2031: Is it possible to use I2C slave without INT out?

DongGyu LEE

Part Number: MSP430I2031

Hello there,

We are developing a metering module for I2C communication using MSP430i2031.

The basic code generated through "Energy Measurement Design" is the UART communication method, and we have modified it and changed it to the I2C slave method.

However, it often happens that the master MCU cannot respond to the request.

When we checked, it seemed that the I2C interrupt did not work properly while the ADC interrupt (SD24) was running.

So, in the basic code, it seems to have been solved by blocking interrupts except for I2C for a while before sending data to I2C.

Is there any other way other than this?

That is, is there a way to use an I2C slave without an INT out?

Thank you

over 3 years ago

0 Eason Zhou over 3 years ago

TI__Mastermind 40195 points

Maybe you can try to use I2C without interrupt. The ADC interrupt is used as the system clock. I would suggest you not to change that part.

0 DongGyu LEE over 3 years ago in reply to Eason Zhou

Prodigy 50 points

Thanks for the reply.

i2c communication sometimes doesn't work.

What I am wondering is, is it called when i2c interrupt occurs during ADC interrupt routine?

+1 Eason Zhou over 3 years ago in reply to DongGyu LEE

TI__Mastermind 40195 points

The priority of I2C is higher than ADC. I would assume the problem happens when ADC interrupt happens in the I2C communication. As MSP430 doesn't support interrupt nesting and there are much calculation in the ADC interrupt.

I would suggest you try to use interrupt nesting by adding "__bis_SR_register(GIE);" in ADC interrupt to see whether this can give some help.

0 DongGyu LEE over 3 years ago in reply to Eason Zhou

Prodigy 50 points

thanks for your reply

good! ok, i will try this

thank you so much :)

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

MSP430I2031: Is it possible to use I2C slave without INT out?