Tomás Vega / PololuLedStrip

Forked PololuLedStrip and modified it to work with the KL25Z. Renamed it to Adafruit_NeoPixel.

Fork of PololuLedStrip by David Grayson

led_strip_write_color.s@0:06475317f283, 2013-02-27 (annotated)

Committer:
DavidEGrayson
Date:
Wed Feb 27 00:28:26 2013 +0000
Revision:
0:06475317f283
Child:
4:d3b60bd43811
Still working;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DavidEGrayson 0:06475317f283 1 AREA asm_func, CODE, READONLY
DavidEGrayson 0:06475317f283 2 EXPORT led_strip_write_color
DavidEGrayson 0:06475317f283 3
DavidEGrayson 0:06475317f283 4 led_strip_write_color
DavidEGrayson 0:06475317f283 5 push {r12, r7}
DavidEGrayson 0:06475317f283 6
DavidEGrayson 0:06475317f283 7 ldr r12, [r0] ; Read the next color.
DavidEGrayson 0:06475317f283 8 rbit r12, r12 ; Reverse the order of the bits.
DavidEGrayson 0:06475317f283 9 rev r12, r12 ; Reverse the order of the bytes.
DavidEGrayson 0:06475317f283 10 mov r7, #24 ; Initialize the loop counter register.
DavidEGrayson 0:06475317f283 11
DavidEGrayson 0:06475317f283 12 send_led_strip_bit
DavidEGrayson 0:06475317f283 13 str r3, [r1] ; Drive the line high.
DavidEGrayson 0:06475317f283 14 rrxs r12, r12 ; Rotate right through carry.
DavidEGrayson 0:06475317f283 15
DavidEGrayson 0:06475317f283 16 nop
DavidEGrayson 0:06475317f283 17 nop
DavidEGrayson 0:06475317f283 18 nop
DavidEGrayson 0:06475317f283 19 nop
DavidEGrayson 0:06475317f283 20 nop
DavidEGrayson 0:06475317f283 21 nop
DavidEGrayson 0:06475317f283 22 nop
DavidEGrayson 0:06475317f283 23 nop
DavidEGrayson 0:06475317f283 24 nop
DavidEGrayson 0:06475317f283 25 nop
DavidEGrayson 0:06475317f283 26
DavidEGrayson 0:06475317f283 27 nop
DavidEGrayson 0:06475317f283 28 nop
DavidEGrayson 0:06475317f283 29 nop
DavidEGrayson 0:06475317f283 30 nop
DavidEGrayson 0:06475317f283 31 nop
DavidEGrayson 0:06475317f283 32 nop
DavidEGrayson 0:06475317f283 33 nop
DavidEGrayson 0:06475317f283 34 nop
DavidEGrayson 0:06475317f283 35 nop
DavidEGrayson 0:06475317f283 36 nop
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DavidEGrayson 0:06475317f283 38 nop
DavidEGrayson 0:06475317f283 39 nop
DavidEGrayson 0:06475317f283 40 nop
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DavidEGrayson 0:06475317f283 49 nop
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DavidEGrayson 0:06475317f283 60 nop
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DavidEGrayson 0:06475317f283 71 nop
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DavidEGrayson 0:06475317f283 82 nop
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DavidEGrayson 0:06475317f283 84 nop
DavidEGrayson 0:06475317f283 85 nop
DavidEGrayson 0:06475317f283 86
DavidEGrayson 0:06475317f283 87 it cc ; If the bit to send it 0...
DavidEGrayson 0:06475317f283 88 strcc r3, [r2] ; Drive the line low.
DavidEGrayson 0:06475317f283 89
DavidEGrayson 0:06475317f283 90 nop
DavidEGrayson 0:06475317f283 91 nop
DavidEGrayson 0:06475317f283 92 nop
DavidEGrayson 0:06475317f283 93 nop
DavidEGrayson 0:06475317f283 94 nop
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DavidEGrayson 0:06475317f283 101 nop
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DavidEGrayson 0:06475317f283 105 nop
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DavidEGrayson 0:06475317f283 112 nop
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DavidEGrayson 0:06475317f283 123 nop
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DavidEGrayson 0:06475317f283 134 nop
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DavidEGrayson 0:06475317f283 145 nop
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DavidEGrayson 0:06475317f283 153 nop
DavidEGrayson 0:06475317f283 154
DavidEGrayson 0:06475317f283 155
DavidEGrayson 0:06475317f283 156 it cs ; If the bit to send is 1...
DavidEGrayson 0:06475317f283 157 strcs r3, [r2] ; Drive the line low.
DavidEGrayson 0:06475317f283 158
DavidEGrayson 0:06475317f283 159 nop
DavidEGrayson 0:06475317f283 160 nop
DavidEGrayson 0:06475317f283 161 nop
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DavidEGrayson 0:06475317f283 170 nop
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DavidEGrayson 0:06475317f283 181 nop
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DavidEGrayson 0:06475317f283 203 nop
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DavidEGrayson 0:06475317f283 247 nop
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DavidEGrayson 0:06475317f283 256 nop
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DavidEGrayson 0:06475317f283 258 nop
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DavidEGrayson 0:06475317f283 262 nop
DavidEGrayson 0:06475317f283 263 nop
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DavidEGrayson 0:06475317f283 265 nop
DavidEGrayson 0:06475317f283 266 nop
DavidEGrayson 0:06475317f283 267 nop
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DavidEGrayson 0:06475317f283 269 nop
DavidEGrayson 0:06475317f283 270 nop
DavidEGrayson 0:06475317f283 271 nop
DavidEGrayson 0:06475317f283 272 nop
DavidEGrayson 0:06475317f283 273 nop
DavidEGrayson 0:06475317f283 274 nop
DavidEGrayson 0:06475317f283 275 nop
DavidEGrayson 0:06475317f283 276
DavidEGrayson 0:06475317f283 277 sub r7, r7, #1 ; Decrement the loop counter.
DavidEGrayson 0:06475317f283 278 cbz r7, led_strip_asm_end ; If we have sent 24 bits, go to the end.
DavidEGrayson 0:06475317f283 279 b send_led_strip_bit ; Otherwise, go back and send another bit.
DavidEGrayson 0:06475317f283 280
DavidEGrayson 0:06475317f283 281 led_strip_asm_end
DavidEGrayson 0:06475317f283 282 pop {r12, r7}
DavidEGrayson 0:06475317f283 283 bx lr
DavidEGrayson 0:06475317f283 284
DavidEGrayson 0:06475317f283 285 END