S12 / MagniV MicrocontrollersのトピックHow to use const or enum in struct?

How to use const or enum in struct?

aaronlee — Sat, 19 Oct 2019 14:37:34 GMT

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

Re: How to use const or enum in struct?

kef2 — Sun, 20 Oct 2019 07:15:36 GMT

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};

Re: How to use const or enum in struct?

aaronlee — Thu, 24 Oct 2019 04:52:44 GMT

Dear Edward,

Thank you very much.

Best Regard,

Aaron