/*****************************************************************************
Function:
void WF_SpiInit(void)
Summary:
Initializes the SPI interface to the MRF24W device.
Description:
Configures the SPI interface for communications with the MRF24W.
Precondition:
None
Parameters:
None
Returns:
None
Remarks:
This function is called by WFHardwareInit.
*****************************************************************************/
void WF_SpiInit(void)
{
/* disable the spi interrupt */
#if defined( __XC32 )
WF_SPI_IE_CLEAR = WF_SPI_INT_BITS;
#else
WF_SPI_IE = 0;
#endif
#if defined( __XC8)
WF_SPI_IP = 0;
#endif
// Set up the SPI module on the PIC for communications with the MRF24W
WF_CS_IO = 1;
WF_CS_TRIS = 0; // Drive SPI MRF24W chip select pin
#if defined( __XC8)
WF_SCK_TRIS = 0; /* SPI Clock is an output */
WF_SDO_TRIS = 0; /* SPI Data Out is an output */
WF_SDI_TRIS = 1; /* SPI Data In is an input */
#else
// We'll let the module control the pins.
#endif
#if !defined( SPI_IS_SHARED )
ConfigureSpiMRF24W();
#endif
/* clear the completion flag */
ClearSPIDoneFlag();
}
/*****************************************************************************
Function:
bool WF_SpiInit(void)
Summary:
Initializes the SPI interface to the MRF24W device.
Description:
Configures the SPI interface for communications with the MRF24W.
Precondition:
None
Parameters:
None
Returns:
None
Remarks:
This function is called by WFHardwareInit.
*****************************************************************************/
bool WF_SpiInit(void)
{
bool res;
/* disable the spi interrupt if necessary */
// No need because SPI interrupt is not used
// Initialize IO for WF chip select
WF_CS_Init();
WF_SpiDisableChipSelect(); // Disable chip select before initialization
res = ConfigureSpiMRF24W();
return res;
}
/*****************************************************************************
Function:
void WF_SpiEnableChipSelect(void)
Summary:
Enables the MRF24W SPI chip select.
Description:
Enables the MRF24W SPI chip select as part of the sequence of SPI
communications.
Precondition:
None
Parameters:
None
Returns:
None
Remarks:
If the SPI bus is shared with other peripherals then the current SPI context
is saved.
*****************************************************************************/
void WF_SpiEnableChipSelect(void)
{
#if defined(__XC8)
static volatile uint8_t dummy;
#endif
#if defined(SPI_IS_SHARED)
SaveSpiContext();
ConfigureSpiMRF24W();
#endif
/* set Slave Select low (enable SPI chip select on MRF24W) */
WF_CS_IO = 0;
/* clear any pending interrupts */
#if defined(__XC8)
dummy = WF_SSPBUF;
ClearSPIDoneFlag();
#endif
}
