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WS28xx/APA102/UCSx903/TLC59711 configuration

The WS28xx configuration is stored on the sdcard in the file "devices.txt". 

Parameter name  Description
 led_type
  WS2801, WS2811, WS2812, WS2812B, WS2813, WS2815, SK6812, SK6812W, APA102,  TLC59711, UCS1903, UCS2903
 led_count
 170 (default)
 led_grouping
 1 / 0 (default) Enables led grouping
 led_group_count Applicable when led_grouping=1. Must be greater than 1
 dmx_start_address Applicable when led_grouping=1 or when led_type=TLC59711
 clock_speed_hz Applicable when led_type is : WS2801, APA102 or TLC59711
 global_brightness Applicable for the APA102 only

Example:
led_type=WS2812B
led_count=144
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