Rise time of SPI Signal

Posted on February 10, 2015 at 10:50

Hi

I am using STM32F103

RBT6

@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?

Salam

Hossam Alzmor

#gpio-risetime