marc marc / NeoPixel

Simple neopixel (WS2812) library, tuned for stm32 (L432) at 80 MHz Should be compatible with any stm32, different clock speed may require timing adjustments in neopixel.c

Dependents:   F746_projet_led_version_final

Files at this revision

API Documentation at this revision

Revision 1:911fe4d70205, committed 2019-06-04

Comitter:
marcolasek
Date:
Tue Jun 04 12:44:43 2019 +0000
Parent:
0:a81364d9a67b
Commit message:
version final;

Changed in this revision

neopixel.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r a81364d9a67b -r 911fe4d70205 neopixel.cpp
--- a/neopixel.cpp	Tue Mar 21 21:17:08 2017 +0000
+++ b/neopixel.cpp	Tue Jun 04 12:44:43 2019 +0000
@@ -10,23 +10,23 @@
 // The timing should be approximately 800ns/300ns, 300ns/800ns
 void NeoPixelOut::byte(register uint32_t byte)
 {        
-    for (int i = 0; i < 8; i++) {
+    for (int i = 0; i < 8; i++) {  //8
         gpio_write(&gpio, 1);
         
         // duty cycle determines bit value
         if (byte & 0x80) {
             // one
-            for(int j = 0; j < 6; j++) __nop();
+            for(int j = 0; j < 72; j++) __nop();//6
             
             gpio_write(&gpio, 0);
-            for(int j = 0; j < 2; j++) __nop();
+            for(int j = 0; j < 24; j++) __nop();//2
         }
         else {
             // zero
-            for(int j = 0; j < 2; j++) __nop();
+            for(int j = 0; j < 24; j++) __nop();//2
             
             gpio_write(&gpio, 0);
-            for(int j = 0; j < 5; j++) __nop();
+            for(int j = 0; j < 60; j++) __nop();//5
         }
 
         byte = byte << 1; // shift to next bit