/*****************************************************************************
Function:
void WF_SpiInit(void);
Summary:
Initializes SPI controller used to communicate with MRF24WG
Description:
Called by Universal Driver during initialization to initialize SPI interface.
Parameters:
None
Returns:
None
Remarks:
Should not be called directly from application code.
*****************************************************************************/
void WF_SpiInit(void)
{
volatile uint8_t rxData;
#if defined(__PIC32MZ__)
WF_INT_PPS();
WF_HIB_PPS();
WF_RESET_PPS();
WF_CS_PPS();
WF_SCK_PPS();
WF_SDI_PPS();
WF_SDO_PPS();
#endif
// The MRF24WG chip select line will be controlled using an I/O pin, not by
// the SPI controller.
WF_CS_IO = 1; // set the level high (chip select disabled)
WF_CS_TRIS = 0; // Configure the I/O pin as an output and drive it
// disable the three possible SPI interrupts (SP1 Fault, SP1 Rx done,
// SPI1 Transfer Done). Universal Driver does not require SPI interrupts.
// SPI_IECxCLR = 0x03800000; //
WIFI_SPI_INT_EIE = 0;
WIFI_SPI_INT_TXIE = 0;
WIFI_SPI_INT_RXIE = 0;
// disable SPI controller
WIFI_SPICONbits.ON = 0;
// clear the receive buffer
rxData = WIFI_SPIBUF;
(void) rxData; // prevent unsued warning
// set the SPI baud rate to 10MHz
// Fsck = Fpb / (2 * (SPI1BRG + 1) = 80MHz / (2 * (3 + 1)) = 80MHz / 8 = 10MHz
WIFI_SPIBRG = max((((int) ((GetPeripheralClock() + WF_SPI_FREQ) / 2 / WF_SPI_FREQ)) - 1), 0);
// configure SPI1:
// * Master Mode enabled (MSTEN = 1)
// * Clock Polarity is idle high, active low (CKP = 1)
// * Serial output data changes on transition from idle clock state to active
// clock state, or high to low transition (CKE = 0)
// * Data sampled at end of output time (SMP = 1), on rising edge
WIFI_SPICON = 0x00000260;
// enable SPI controller
WIFI_SPICONbits.ON = 1;
}
/*
* Initializes SPI controller used to communicate with MRF24WG.
* Called by Universal Driver during initialization to initialize SPI interface.
*/
void WF_SpiInit()
{
uint8_t rxData __attribute__((unused));
#ifdef WF_INT_PPS
WF_INT_PPS();
WF_HIBERNATE_PPS();
WF_RESET_PPS();
WF_CS_PPS();
WF_SCK_PPS();
WF_SDI_PPS();
WF_SDO_PPS();
#endif
// The MRF24WG chip select line will be controlled using an I/O pin, not by
// the SPI controller.
WF_CS_SET(1); // set the level high (chip select disabled)
WF_CS_INPUT(0); // Configure the I/O pin as an output and drive it
// disable the three possible SPI interrupts (SPI Fault, SPI Rx done,
// SPI Transfer Done). Universal Driver does not require SPI interrupts.
IECCLR(WIFI_SPI_IRQ_E >> 5) = 1 << (WIFI_SPI_IRQ_E & 31);
IECCLR(WIFI_SPI_IRQ_TX >> 5) = 1 << (WIFI_SPI_IRQ_TX & 31);
IECCLR(WIFI_SPI_IRQ_RX >> 5) = 1 << (WIFI_SPI_IRQ_RX & 31);
// disable SPI controller
WIFI_SPICONCLR = PIC32_SPICON_ON;
// clear the receive buffer
rxData = WIFI_SPIBUF;
// set the SPI baud rate
WIFI_SPIBRG = ((BUS_FREQ + WF_SPI_FREQ) / 2 / WF_SPI_FREQ) - 1;
// configure SPI port:
// * Master Mode enabled (MSTEN = 1)
// * Clock Polarity is idle high, active low (CKP = 1)
// * Serial output data changes on transition from idle clock state to active
// clock state, or high to low transition (CKE = 0)
// * Data sampled at end of output time (SMP = 1), on rising edge
WIFI_SPICON = PIC32_SPICON_MSTEN |
PIC32_SPICON_CKP |
PIC32_SPICON_SMP;
// enable SPI controller
WIFI_SPICONSET = PIC32_SPICON_ON;
}
