Tomás Vega
Forked PololuLedStrip and modified it to work with the KL25Z. Renamed it to Adafruit_NeoPixel.
Dependents: idd_hw3 idd_fa15_hw3_lauren_bill_tomas idd_fa15_hw3_lauren_bill_tomas Raiden ... more
Fork of
PololuLedStrip
by 
David Grayson
Diff: led_strip_write_color.s
- Revision:
- 0:06475317f283
- Child:
- 4:d3b60bd43811
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/led_strip_write_color.s Wed Feb 27 00:28:26 2013 +0000
@@ -0,0 +1,285 @@
+ AREA asm_func, CODE, READONLY
+ EXPORT led_strip_write_color
+
+led_strip_write_color
+ push {r12, r7}
+
+ ldr r12, [r0] ; Read the next color.
+ rbit r12, r12 ; Reverse the order of the bits.
+ rev r12, r12 ; Reverse the order of the bytes.
+ mov r7, #24 ; Initialize the loop counter register.
+
+send_led_strip_bit
+ str r3, [r1] ; Drive the line high.
+ rrxs r12, r12 ; Rotate right through carry.
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+
+ it cc ; If the bit to send it 0...
+ strcc r3, [r2] ; Drive the line low.
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+
+ it cs ; If the bit to send is 1...
+ strcs r3, [r2] ; Drive the line low.
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ sub r7, r7, #1 ; Decrement the loop counter.
+ cbz r7, led_strip_asm_end ; If we have sent 24 bits, go to the end.
+ b send_led_strip_bit ; Otherwise, go back and send another bit.
+
+led_strip_asm_end
+ pop {r12, r7}
+ bx lr
+
+ END
\ No newline at end of file