MSP430FR6043: IRQ in I2C

meng hi

Part Number: MSP430FR6043
Other Parts Discussed in Thread: EVM430-FR6043

When using evm430-fr6043, msp430fr6043 uses I2C and IRQ for communication. I don't quite understand the role of IRQ and the timing relationship with I2C.

over 3 years ago

0 Evan Lew over 3 years ago

TI__Genius 10060 points

Hi Meng Hi,

I would recommend reading through the MSP Academy: I2C Communication. To answer your question specifically, using an IRQ allows the CPU to sleep (or perform other tasks) ultil the I2C peripheral needs attention (ex: ready to send a new byte, or finished receiving a byte). Take a look at the USCI_B0_ISR() in the code example msp430fr243x_eusci_i2c_standard_slave.c.

Hope that helps.

Best,

Evan

0 meng hi over 3 years ago in reply to Evan Lew

Prodigy 40 points

HI Evan Lew

I just checked these materials, but I still don't understand the IRQ timing. I hope to get your detailed explanation. Thank you.

0 Evan Lew over 3 years ago in reply to meng hi

TI__Genius 10060 points

Hi Meng Hi,

Could you clarify what you mean by "interrupt timing"? The I2C has the ability to generate many interrupts, see section 32.4.16 in the User Guide

Regards,

Evan

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MSP430FR6043: IRQ in I2C