www.pudn.com > usbboot-v1.2.rar.zip > serial.c, change:2008-02-27,size:2475b

#include "jz4740.h"

#define UART_BASE UART0_BASE
//#define EXTAL_CLK 32768000
//#define CONFIG_BAUDRATE 9600
#define CONFIG_BAUDRATE 57600
#define CFG_EXTAL		12000000	/* EXTAL freq must=12 MHz !! */

void serial_setbrg (void)
{
	volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR);
	volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR);
	volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR);
	u32 baud_div, tmp;

	baud_div = CFG_EXTAL / 16 / CONFIG_BAUDRATE;
	tmp = *uart_lcr;
	tmp |= UART_LCR_DLAB;
	*uart_lcr = tmp;

	*uart_dlhr = (baud_div >> 8) & 0xff;
	*uart_dllr = baud_div & 0xff;

	tmp &= ~UART_LCR_DLAB;
	*uart_lcr = tmp;
}

void serial_putc (const char c)
{
	volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR);
	volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR);

	if (c == '\n') serial_putc ('\r');

	/* Wait for fifo to shift out some bytes */
	while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) );

	*uart_tdr = (u8)c;
}

void serial_puts (const char *s)
{
	while (*s) {
		serial_putc (*s++);
	}
}

#if 0
int serial_getc (void)
{
	volatile u8 *uart_rdr = (volatile u8 *)(UART_BASE + OFF_RDR);

	while (!serial_tstc());

	return *uart_rdr;
}

int serial_tstc (void)
{
	volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR);

	if (*uart_lsr & UART_LSR_DR) {
		/* Data in rfifo */
		return (1);
	}
	return 0;
}
#endif

void serial_init(void)
{
	volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR);
	volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR);
	volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER);
	volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR);

	/* Disable port interrupts while changing hardware */
	*uart_ier = 0;

	/* Disable UART unit function */
	*uart_fcr = ~UART_FCR_UUE;

	/* Set both receiver and transmitter in UART mode (not SIR) */
	*uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE);

	/* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
	*uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1;

	/* Set baud rate */
	serial_setbrg();

	/* Enable UART unit, enable and clear FIFO */
	*uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS;
}

#if 1
void serial_put_hex(unsigned int  d)
{
	unsigned char c[12];
	char i;
	for(i = 0; i < 8;i++)
	{
		c[i] = (d >> ((7 - i) * 4)) & 0xf;
		if(c[i] < 10)
			c[i] += 0x30;
		else
			c[i] += (0x41 - 10);
	}
	c[8] = '\n';
	c[9] = 0;
	serial_puts(c);

}
#endif