Unused return value causes warning

rayhall — Thu, 13 Jun 2013 07:34:34 GMT

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;

}

Re: Unused return value causes warning

kef — Thu, 13 Jun 2013 08:48:09 GMT

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);

Re: Unused return value causes warning

rayhall — Thu, 13 Jun 2013 08:55:37 GMT

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);

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