The typedef could be declared using anonymous structures instead named ones=
:

typedef union {
  struct {
    uint32_t rgb: 24;
    uint32_t alpha:8; /* <=3D Alpha channel may be useful instead of a
useless padding */
    };   /* <=3D Notice the lack of name here */
  struct {
    uint8_t red;
    uint8_t green;
    uint8_t blue;
  };    /* <=3D Notice the lack of name here */
} rgb32_t;

This way you could use:

rgb32_t    Color1;

Color1.rgb  =3D 0x123456;

or

Color1.red        =3D 0x12;
Color1.green    =3D 0x34;
Color1.blue      =3D 0x56;


Anonymous structures are not supported by C89 standard, only from C99
onwards.


Isaac


On 18/08/2014 03:18, Ruben J=F6nsson wrote:
>> Well actually it could be something like this instead:
>>
>> typedef union {
>>   uint32_t rgb_32;
>>   struct {
>>     uint8_t red:8;
>>     uint8_t green:8;
>>     uint8_t blue:8;
>>     uint8_t pad:8;
>>   }col;
>> }RGB;
>>
>> Then you can do:
>>
>> RGB rgb;
>> rgb.col.red=3D12;
>>
>> An array would also be fine:
>>
>> RGB rgb[10];
>> rgb[5].col.red=3D12;
>>
> Correcting myself here:
>
>> If you don't have the typedef you need to explicitly declare it as:
>>
>> union RGB rgb;
> This is not correct. Just ignore it...
>
>
> /Ruben



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