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typdef, struct and enums in ccsc

 
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jamesjl



Joined: 22 Sep 2003
Posts: 52
Location: UK

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typdef, struct and enums in ccsc
PostPosted: Thu Apr 07, 2005 6:20 am     Reply with quote
Hi all,

In an attempt to make my code as readable as possible for future maintenance I should like to create some enums, typedef structs and arrays of structs!!!! Shocked

Does anyone have an opinion as to how well this will work. It seems to compile OK!

Code:

typedef enum PortStatusDef
{
   Unconnected = 0,
   NewPortDetected = 1,
   Port_A = 2,
   CheckStillA = 3,
   CandidateLow = 4,
   CheckIfCOnnected = 5,
   NewPortB = 6,
   LocalCheck1 = 7,
   LocalCheck2 = 8,
   Port_B = 9,
   PortBLow = 10,
   CSLookingForRemote = 11,
   WaitPortALow = 12
};

typedef struct {
   PortStatusDef PortState;
   int8 PortNumber;
   int8 LastState;
   int8 NewState;
   int8 time;
   int8 NewStateStableTime;
} port;

port PortStatus[24];

void ProcessMessage(int8 msg, int8 thisPort)
{
   switch (PortStatus[thisPort].PortState)
   {
      case Unconnected :
      {
      // detemine what to do here based on value of msg.
      }
      case NewPortDetected :
      {
      // detemine what to do here based on value of msg.
      }
      case Port_A :
      {
      // detemine what to do here based on value of msg.
      }
      .
      .
      .
      .
      default:
         ;
   }
}


I guess I'm asking if creating a typedef enum in an attempt to only use the correct value is a good move?

Thanks in advance.

Jason.
Ttelmah
Guest
PostPosted: Thu Apr 07, 2005 3:24 pm     Reply with quote
Using enums, is a good way of helping to prevent 'silly' accidents with values. Especially dealing with a set of values like this, and a switch statement, I'd say it was a good way to go.
There is a 'caveat', that CCS, can develop some oddities if declarations get too complex, but the current versions seem better in this regard...

Best Wishes
Guest
PostPosted: Fri Apr 08, 2005 12:56 am     Reply with quote
Many thanks. Any other thoughts on typedef enum or typedef struct?

Regards.
jamesjl



Joined: 22 Sep 2003
Posts: 52
Location: UK

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PostPosted: Fri Apr 08, 2005 12:57 am     Reply with quote
Sorry. The post above was from me. Just wasn't logged in.

Jason.
Guest
PostPosted: Fri Apr 08, 2005 1:18 pm     Reply with quote
I have a question. Will the "PortStatusDef PortState;" in the struct occupy 8-bits or 4-bits in the structure?
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Fri Apr 08, 2005 1:46 pm     Reply with quote
Anonymous wrote:
I have a question. Will the "PortStatusDef PortState;" in the struct occupy 8-bits or 4-bits in the structure?


The enum in this case is an 8 bit number so 8 bits.
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