How to use const or enum in struct?

[aaronlee]

Hi,

How to use const in struct?

struct SDCardState

{

   const uint16_t initTimeout=2000;

   enum uint8_t CardType {

      CardTypeSD1,

      CardTypeSD2,

      CardTypeSDHC,

   }

}

We got a error as follow:

';' expected 

Best Regard,

Aaron

[kef2 · Accepted solution]

Lots of problems in your snippet. Please make sure first that uint16_t and uint8_t are defined.

1. initialized can't be specified inside the struct. 

2. enum is already type, it can't be uint8_t or uint16-t, it's just enum, which has as many bits as required to store any of enumerated values in your list, 8 bits could be enough in one case, could be not enough in another case.

Provided uint16_t and unit8_t are defined:

struct SDCardState

{

   const uint16_t initTimeout;

   enum CardType {

      CardTypeSD1,

      CardTypeSD2,

      CardTypeSDHC,

   }

} instance = {2000};

[aaronlee]

Dear Edward,

Thank you very much.

Best Regard,

Aaron