Unused return value causes warning

[rayhall]

I am converting code from a Atmel AVR project into S12XE. I am getting warnings that relate to return values not being used. What is the work around for this.

This is typical of the items that are causing the warnings SpiWriteRead(AT45DB041B_CMD_STATUS_REGISTER_READ);

Below is the offending code.

Ray.

//----------------------------- SPI Write ----------------------------------

void SpiWrite(uint8_t data)

{ 

  while (!SPI0SR_SPTEF);   /* Wait for empty data register */    

  SPI0DRL = data;      // initiate write              

}

//-------------------------------- SPI Read -------------------------------------

uint8_t SpiRead(void) {

   while ((SPI0SR & SPI0SR_SPIF_MASK));  /* Wait for data in the receive buffer */

   return(SPI0DRL);     /* Return received data */      

}

//---------------------------- SPI Write Read ------------------------------

uint8_t SpiWriteRead(uint8_t data)

{

  uint8_t rxdat;

  SpiWrite(data);

  rxdat = SpiRead();

  return(data);

}

//---------------------------------------------- AT45DB Get Status --------------------------------------------------

uint8_t at45db041b_get_status(void)

{

   uint8_t data;

    // Select serial Flash

    DF_CS_active;

    // Send command

    SpiWriteRead(AT45DB041B_CMD_STATUS_REGISTER_READ);

    // Read status

    data = SpiWriteRead(0x00);

    // Deselect serial Flash

    DF_CS_inactive;

    return data;

}

[kef · Accepted solution]

Either disable this warning in compiler settings like

#pragma MESSAGE DISABLE xxx

where xxx is message number like C5909

, or typecast function return to void type like this

    (void)SpiWriteRead(AT45DB041B_CMD_STATUS_REGISTER_READ);

[rayhall]

Edward,

Thank you for the reply.

This will work for me.

, or typecast function return to void type like this

    (void)SpiWriteRead(AT45DB041B_CMD_STATUS_REGISTER_READ);

Re: Unused return value causes warning