David Knight / PololuLedStrip

This library lets you control the addressable RGB LED strips from Pololu Robotics. Forked to add selectable colour order (Support RGB or GRB Leds)

Fork of PololuLedStrip by David Grayson

Diff: led_strip_write_color.s

Revision:
27:9a62663f3de2
Parent:
24:5c01a6fa1556
--- a/led_strip_write_color.s	Wed Nov 01 23:11:49 2017 +0000
+++ b/led_strip_write_color.s	Sat May 19 14:16:38 2018 +0000
@@ -28,14 +28,14 @@
     ; Push those registers so we can restore them later.
     push {r4, r5, r6, r7, lr}
 
-    ldrb r6, [r0, #1]  ; Load green.
-    lsls r6, r6, #24   ; Put green in MSB of r6.
-    ldrb r4, [r0, #0]  ; Load red.
+    ldrb r6, [r0, #0]  ; Load first colour.
+    lsls r6, r6, #24   ; Put first colour in MSB of r6.
+    ldrb r4, [r0, #1]  ; Load second colour.
     lsls r4, r4, #16
-    orrs r6, r6, r4    ; Put red in r6.
-    ldrb r4, [r0, #2]  ; Load blue.
+    orrs r6, r6, r4    ; Put second colour in r6.
+    ldrb r4, [r0, #2]  ; Load third colour.
     lsls r4, r4, #8
-    orrs r6, r6, r4    ; Put blue in r6.
+    orrs r6, r6, r4    ; Put third colour in r6.
    
     ; On the Cortex-M3 we simply did:
     ;    ldr r6, [r0]       ; Read the color.  Now we have:     xxBbGgRr