TMS320F28035: SPI FIFO RX INT PROBLEM

Andrey Kiselnikov

Part Number: TMS320F28035

Hi everyone! I configured SPI and I want that it will makes interrupts only, when TX FIFO is empty, but it makes two type of interrupts: when TX FIFO is empty and RX FIFO is empty. I can not understand why this interrupt happend, because it disabled, and SPI INT in SPI CTL is disabled. What did i do wrong? ps Lets look at the screenshots of the registers when different types of interrupts has happened.

over 9 years ago

0 Andrey Kiselnikov over 9 years ago

Prodigy 80 points

Also I want to know about this moment:

0 Mark Labbato over 9 years ago in reply to Andrey Kiselnikov

Guru 30330 points

Andrey,

First, the description in RXFFOVF is incorrect. The maximum words is 4 words. I will ensure that this is fixed.

I am not sure that I understand your issue. You should not be receiving any interrupt from the RXFIFO. It looks like in the "not correct" interrupt, you still have two words in the TX FIFO, so you are correct, the TX interrupt should not have fired.

How many words do you write to the TXFIFO for every interrupt? Do you clear the TXFFINT bit by writing to TXFFINT_CLR?

Regards,

Mark

0 Mark Labbato over 9 years ago in reply to Mark Labbato

Guru 30330 points

Andrey,

Were you able to resolve your concerns?

Thanks,
Mark

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28035: SPI FIFO RX INT PROBLEM