title: STM32F4 nanosecs delay
body: <p>I've been playing with SysTick for a couple of days and i cannot reach nanoseconds delay. Is it possible with Systick to reach such small values or i have to use timers and interrupts? The LEDs though won't work lower than 350ns delay. Here is an image from my usb oscilloscope:</p>
  
  <p><img src="https://i.stack.imgur.com/kuxcO.png" alt="enter image description here"></p>
  
  <p>In general I want to make a project (i am just experimenting with LEDs and SysTick above) which will be like this:</p>
  
  <p><img src="https://i.stack.imgur.com/qAejP.png" alt="enter image description here"></p>
  
  <p>where Δt = 250ns (the other parameters will be determined somehow). The question is, can I make these pulses by using SysTick?</p>