RM44L520: Interrupt on chip select for SPI1 and SPI3

Devendra Gupta

Part Number: RM44L520

I have a requirement where i need to configure interrupt on falling edge for the chip select-0 line of SPI1 and SPI3. SPI1 and SPI3 are configured as SLAVE.

Although these lines are used by respective SPI modules, is it possible to do it? Could you please guide me how to achive the same

Thank you and have a wonderful day.

over 4 years ago

0 QJ Wang over 4 years ago

TI__Guru**** 196526 points

For SPI, there are one RX interrupt and one TX interrupt. When data is written to the TX shift register, the TX empty interrupt is generated. When data is received and copied into the RX buff register (SPIBUF), the RX full interrupt is generated.

The SPI nCS is output signal from RR44 and is used to select SPI slave. It doesn't generate any interrupt to RM44.

You can connect the SPI nCS signal to one GIO pin, and configure this GIO to generate interrupt at falling edge.

0 Devendra Gupta over 4 years ago

Prodigy 150 points

I think you missed to notice the statement where I mentioned that the RM44 is configured as slave. Is it still possible?

Thank you

0 QJ Wang over 4 years ago in reply to Devendra Gupta

TI__Guru**** 196526 points

No, SPI nCS doesn't generate interrupt at falling edge or rising edge.

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RM44L520: Interrupt on chip select for SPI1 and SPI3