Macro ws2812_constants 

ws2812_constants!() { /* proc-macro */ }

Proc macro that generates a constant with the given name that contains all 256 combinations of patters to send a byte to WS2812

Example:

   // This creates a `const WRITE_4_BYTE_CONSTANTS: [[u8;4]; 256]
   // Note that this requires 1K flash
   use ws2812_spi_write_constants::ws2812_constants;

   ws2812_constants!(WRITE_4_BYTE_CONSTANTS);

   assert_eq!(
       WRITE_4_BYTE_CONSTANTS[0b0000_0000],
       [0b0100_0100, 0b0100_0100, 0b0100_0100, 0b0100_0100]
   );

   assert_eq!(
       WRITE_4_BYTE_CONSTANTS[0b0100_1100],
       [0b0100_0111, 0b0100_0100, 0b0111_0111, 0b0100_0100]
   );

   assert_eq!(
       WRITE_4_BYTE_CONSTANTS[0b1111_1111],
       [0b0111_0111, 0b0111_0111, 0b0111_0111, 0b0111_0111]
   );