Solved
External interrupt and SPI clock on same pin. Is it possible?
Posted on July 02, 2018 at 12:14
Hallo.
I'm developing an application, using a STM32L433.
My device is a SPI Slave that receive, every a fixed amount of time, a 4 bytes long frame on SPI3 port.
Since I need a time syncronization with the SPI master, my idea was to enable an external interrupt (EXTI) on the SPI clock pin, to manage a kind of time stamp, leaving the SPI fifo receiving the four bytes.
When I was in the 'timestamp' interrupt routine I would have disabled the EXTI interrupt.
At the end of processing the four bytes received by the SPI RX FIFO, I would have enable again the external interrupt in the SPI Clock pin.
The question is: is it possible that a pin used as SPI Clock, as slave (so the pin, in this case, is an input), triggers even an external interrupt?Thank you in advance.
Paolo