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Rise time of SPI Signal

Question asked by alzomor.hossam on Feb 10, 2015
Latest reply on Feb 10, 2015 by AvaTar

I am using STM32F103RBT6 @72MHZ
I use SPI with DMA to stream data from memory to GPIO
SPI Prescaler is 4
GPIO is configured as output push-pull and speed 50MHz
The problem is that the data output rise and fall time is very slow, instead of getting square wave out of the scope for 0xAA data I get sine wave "snapshot attached"

How I can get square wave with good rise and fall time at this frequency?

Hossam Alzmor