SN8F5708 datasheet(150/204 Pages) SONIX

150 / 204 page

www.sonix.com.tw

SN8F5708 Series

SPI

Datasheet Rev. 2.4

150

21.5

Sample Code

The following sample code demonstrates how to perform SPI Master with interrupt.

#define SpiMaster

(1 << 4) //SPI = Master mode

#define SpiSlave

(1 << 4) //SPI = Slave mode

#define SpiMode0

(0 << 2) //SCK idle low, data latch at rising edge

#define SpiMode1

(1 << 2) //SCK idle low, data latch at falling edge

#define SpiMode2

(2 << 2) //SCK idle high, data latch at falling edge

#define SpiMode3

(3 << 2) //SCK idle high, data latch at rising edge

#define SpiEn

(1 << 6) //Enable SPI

#define SpiSSNEn

(0 << 5) //SSN pin function enable

#define SpiSSNDis

(1 << 5) //SSN pin function disable

unsigned char u8SpiData = 0;

// data buffer

unsigned char u8TxCompleted = 0;

void SpiMaster(void)

{

unsigned char u8RcvData = 0;

//SCK & MOSI = output, MISO = input

P1M |= 0x0A;

//Enable Spi, Master mode, SSN pin disable, Fclk/128

//SCK idle low, data latch at falling edge

SPCON = SpiEn | SpiMaster | SpiMode1 | SpiSSNDis | 0x82;

//Enable Global/SPI interrupt

IEN1 |= 0x02;

IEN0 |= 0x80;

//enable global interrupt

while (1) {

SPDAT = 0x55;

while(!u8TxCompleted);

// wait end of transmition

u8TxCompleted = 0;

// clear sw flag

u8RcvData = u8SpiData;

// receive 0x66

SPDAT = 0x99;

while(!u8TxCompleted);

// wait end of transmition

u8TxCompleted = 0;

// clear sw flag

u8RcvData = u8SpiData;

// receive 0xAA

}

void SpiInterrupt(void) interrupt ISRSpi //0x4B

{

switch ( SPSTA )

// Clear SPI flag (SPIF) by reading

{

case 0x80:

u8SpiData = SPDAT;

u8TxCompleted = 1;

break;

case 0x10:

// Mode Fault

break;

}

SN8F5708 Datasheet(PDF) 150 Page - SONiX Technology Company

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