runtime convert HEX colorcode to RGB565 colorcode

hello,

25 years ago coded lot of basic, turbo pascal , visual basic.
but never coded 1 line arduino til now.
this why need started it.

i'm looking small function converts hex colorcode rgb565 colorcode during runtime.

some easy examples:
#000000 should return 0x0000 (black)
#ff0000 should return 0xf800 (red)
#00ff00 should return 0x07e0 (green)
#0000ff should return 0x001f (blue)
#ffffff should return 0xffff (white)

...and on.

the best code found til is:

code: [select]


uint16_t rgb565( const unsigned long rgb)
{
  uint16_t r = (rgb >> 16) & 0xff;
  uint16_t g = (rgb >>  8) & 0xff;
  uint16_t b = (rgb      ) & 0xff;

  uint16_t ret  = (r & 0xf8) << 8;  // 5 bits
           ret |= (g & 0xfc) << 3;  // 6 bits
           ret |= (b & 0xf8) >> 3;  // 5 bits
       
  return( ret);
}
this nice short , easy.
but works not need it.
maybe can adapt me, returns "0x07e0" when gets "#00ff00" ?

thanks , best regards,
chris

quote from: themanfrommoon on jul 08, 2017, 11:57 pm

maybe can adapt me, returns "0x07e0" when gets "#00ff00" ?

it return 0x7e0... trying convert strings , hex?

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