How to read the state of an output pin?

[MGara.1]

I'm using STM32L053 to send an SPI data to other compenet.

i don't know if the data has been send or not. I don't have an oscilloscope to see the signal.

what should i do to know if the data is sent correctly or not?

[KnarfB]

External USB logic analyzers start at $10. Or you build one using a FTDI chip https://sigrok.org/wiki/FTDI-LA.

You could read the SPI back by using a 2nd SPI port on the MCU. But even then, you cannot tell if the data on the wire is exactly as it should be.

hth

KnarfB

[MGara.1]

thank you knarfB,