keyboard diode matrix scanning

[chriskuku]

I'm faced with connecting a (piano) keyboard to an MCU using a number of columns and a number of rows.
The principle is shown in the attached photo.  I've read approaches where the coulmns are pulled to low while the rows are inputs that are sensed.

Am I right that with the given arrangement it would be appropriate to set the columns to "HIGH" and sense the rows whether they are "HIGH"? 

 

Excuses, forgot to say which MCU: it's an STM32F103C8T6 here.
The diodes are common  practice to avoid so called "ghost hits" when multiple contacts are actuated.

[mƎALLEm]

Hello,

Could you please state what STM32 are you using?

[chriskuku]

I edited the original message.

[MM..1]

Explain for what you use diodes here?

[chriskuku]

This explains the purpose of the diodes quite nicely.

[MM..1]

Yes i know for what, but miss your piano info then multipress detecting require it. More safe method is use pullups in MCU and OD (open drain) mode for line scaning to GND...