P0 output

Comments

• kwinn Posts: 8,697

  2012-01-19 18:10 edited 2012-01-19 18:10

  That's how long it takes to execute the instructions in the rest of cog memory. You need to add a jump to "entry" at the bottom. Then the pin should toggle every 150nS ( 3.33MHz )
• caskaz Posts: 957

  2012-01-19 18:21 edited 2012-01-19 18:21

  Thanks kwinn.
  
  I changed

          org 0
  entry   mov outa #0
          mov dira,#1
          mov outa,#1
  b       nop
          jmp b
  

  It output pulse(high=150nsec Low=100nsec).
  And why it become to low?
• JasonDorie Posts: 1,930

  2012-01-19 18:26 edited 2012-01-19 18:26

  You need this:
  

          org 0
  entry   mov outa #0
          mov dira,#1
          mov outa,#1
  b       nop
          jmp [COLOR="#B22222"]#b[/COLOR]
  

  
  What your code is doing is jumping to the address in the memory location labelled 'b', not jumping to that literal address value. Since b is a nop, that memory location probably contains zero, which means your code is jumping back to 'entry'.
• caskaz Posts: 957

  2012-01-19 18:32 edited 2012-01-19 18:32

  Thank you, JasonDorie and kwinn
  I understand it.