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:
10:f1bb84b97788
Parent:
9:6ffb85d69eaf
Child:
11:e00ba70ac54c
--- a/led_strip_write_color.s	Fri Mar 01 03:57:49 2013 +0000
+++ b/led_strip_write_color.s	Fri Mar 01 04:15:35 2013 +0000
@@ -6,7 +6,6 @@
     delay $id
     ldr r5, =led_strip_write_delays
     ldrb r5, [r5, $id]
-    lsls r5, r5, #1
     ldr r4, =delay_region_end
     subs r4, r4, r5
     blx r4
@@ -30,16 +29,16 @@
     push {r4, r5, r6, r7}
     mov r4, lr
     push {r4}
-    
+
     ldrb r4, [r0, #0]  ; Load red.
     lsls r4, r4, #24
     mov r6, r4         ; Put red in MSB of r6.
     ldrb r4, [r0, #1]  ; Load green.
     lsls r4, r4, #16
-    orrs r6, r6, r4        ; Put green in r6.
+    orrs r6, r6, r4    ; Put green in r6.
     ldrb r4, [r0, #2]  ; Load blue.
     lsls r4, r4, #8
-    orrs r6, r6, r4        ; Put blue in MSB of r6.
+    orrs r6, r6, r4    ; Put blue in MSB of r6.
    
     ; On the Cortex M0 we simply did:
     ;    ldr r6, [r0]       ; Read the color.  Now we have:     xxBbGgRr
@@ -70,7 +69,7 @@
     
     delay #2
     
-    lsls r6, r6, #1           ; Shift color bits.
+    lsls r6, r6, #1              ; Shift color bits.
     subs r7, r7, #1           ; Decrement the loop counter.
     bne send_led_strip_bit    ; Send another bit if we have not reached zero.