MATLAB: Getting MISRA 10.1 in Polyspace 2012a for Pointer to Structures.

Question

I am getting the following MISRA(10.1) warning: Implicit conversion of the expression of underlying type'unsigned char' to the type 'signed int' that is not a wider integer type of the same signedness.

The code is as below:

#define ETH_BUFF_NOTUSED ((uint8)0U)

typedef struct Eth_BuffTableType

{

uint8* Eth_BuffPtr;     /* Pointer to the Transmit Buffer*/
uint8  Eth_BuffStatus;  /* Buffer status free or used */
uint8  Eth_StTxCnfn;    /* Tx confirmation requested */
uint8  Eth_FrameTxReq;  /* Request for frame transmission */

}Eth_BuffTableType;

static Eth_BuffTableType *Eth_TxBuffTablePtr;

uint8 TempVar;

(Eth_TxBuffTablePtr + TempVar)->Eth_BuffStatus = ETH_BUFF_NOTUSED;

Question: Why the pointer 'Eth_TxBuffTablePtr' is considered as a 'signed_int'.? Is there any option to make pointer to structures as unsigned while running MISRA checks?

Answer 1

Thanks Alex.