SN8F5708 datasheet(142/204 Pages) SONIX

142 / 204 page

www.sonix.com.tw

SN8F5708 Series

UART

Datasheet Rev. 2.4

142

20.9

Sample Code

The following sample code demonstrates how to perform UART mode 1 with interrupt.

#define SYSUartSM0

(0 << 6)

#define SYSUartSM1

(1 << 6)

#define SYSUartSM2

(2 << 6)

#define SYSUartSM3

(3 << 6)

#define SYSUartREN

(1 << 4)

#define SYSUartSMOD

(1 << 7)

#define SYSUartES0

(1 << 4)

void SYSUartInit(void)

{

// set UTX, URX pins’ mode at here or at GPIO initialization

P05 = 1;

P0M = P0M | 0x20 & ~0x40;

// configure UART mode between SM0 and SM3, enable URX

S0CON = SYSUartSM1 | SYSUartREN;

// configure UART baud rate

PCON = SYSUartSMODE1;

S0CON2 = SYSUartBD1;

S0RELH = 0x03;

S0RELL = 0xFE;

// enable UART interrupt

IEN0 |= SYSUartES0;

// send first UTX data

S0BUF = uartTxBuf;

}

void SYSUartInterrupt(void) interrupt ISRUart

{

if (TI0 == 1) {

S0BUF = uartTxBuf;

TI0 = 0;

} else if (RI0 == 1) {

uartRxBuf = S0BUF;

RI0 = 0;

}

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