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Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/wp-includes/class-wpdb.php:1849) in /var/www/html/wp-includes/feed-rss2-comments.php on line 8 Comments on: WS281x using PIC https://blog.kubovy.eu/2019/02/17/ws281x-using-pic/ shit happens... Thu, 31 Mar 2022 09:58:34 +0000 hourly 1 https://wordpress.org/?v=6.7.4 By: Tirdad sadri nejad https://blog.kubovy.eu/2019/02/17/ws281x-using-pic/#comment-74 Thu, 31 Mar 2022 09:58:34 +0000 https://blog.kubovy.eu/?p=2176#comment-74 Hi, and thank you for the post.
I further went down the de morgan way and found out, that the whole expression of “(SCK & !SDO & PWM) | (SCK & SDO)” is realized using just 3 NAND gates. I made driver using a SPI and PWM on a STM8S and a single 74HC00 logic (4 NANDs). to describe it here in this comment, I write a nand as a “nand(a,b)”:

nand( nand(sck,sdo) , nand(sck,pwm) ).

that’s wonderfully ez and straight forward. one gate has sck,pwm inputs, the other one has sck,sdo inputs. both outputs go to the inputs of the third gate and the output is readilly usable. no additional inverters are used; even the PWM is not negated.
I’ve tested it and it works perfectly.

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