Toggle Pins with Assembly Code

[Anonymous]

Hi,

How can I set or reset specific pins using Assembly language in PSoC4?

Thanks for your help.

[Bob_Marlowe]

Some questions from my side:

Why assembly and not the C-language API

If because of speed, what exactly do you want to perform with your project?

Bob

[Anonymous]

Hi Bob, first of all thank you for your reply!

As for your questions, I'd like to use Assembly because of speed and strict timing implementations. So I am trying to drive WS2812B RGB LEDs, which are controlled using a single GPIO pin. They have a very strict timing for evaluating 0's and 1's, therefore I need to implement some NOPs and have to toggle the GPIO pin in the required frequency.

Kindly check this post (Send 24 bit data with Assembly implementation in PSoC 4 ) for further information on the timing requirements.

I researched on how to toggle specific pins using Assembly in PSoC but unfortunately I couldn't come up with a  result 😕 I'd be very grateful if you could help me out.

Thanks!

[NoriTan · Accepted solution]

I recommend to check following article.

PSoC 4 Pioneer Kit Community Project#100 – PSoC... | element14 | Cypress Kits

This project controls the WS2812B using the UDB block instead of software controlled GPIO.  This is a method to generate a high speed signal for PSoC.

Regards,

Noriaki