SPI Maximum speed

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Joined: Tue Feb 13, 2018 12:57 pm

SPI Maximum speed

Postby yvesbazin » Tue Feb 13, 2018 1:01 pm

Dear all
I want to drive shift registers using SPI as fast as possible.
Using the native SPI pin I should be able to push data at 80Mhz
But it seems like I can't go faster than 5Mhz ?
Also changing duty_cycles doesn't have any effect.
Can someone help me
thank you


Posts: 1567
Joined: Thu Nov 26, 2015 4:08 am

Re: SPI Maximum speed

Postby ESP_Sprite » Wed Feb 14, 2018 5:30 am

SPI is indeed perfectly capable of getting to 80MHz. It's pretty hard to find out why your implementation doesn't without knowing how exactly you set things up and measure speeds.

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