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研发客服参考：
1）《USER'S MANUAL-S3C6410X》第31章 UART
2）u-boot uart初始化及读写：u-boot-x.x.x/board/samsumg/smdk6410/lowlevel_init.S
u-boot-x.x.x/cpu/s3c64xx/serial.c
3) 内核串口驱动：linux-x.x.x/driver/tty/serial/s3c6400.c samsung.c serial_core.c
代码：
uart.c
1 #include 'uart.h'
2
3 #define GPACON (*((volatile unsigned long *)0x7f008000))
4
5 #define ULCON0 (*((volatile unsigned long *)0x7f005000))
6 #define UCON0 (*((volatile unsigned long *)0x7f005004))
7 #define UFCON0 (*((volatile unsigned long *)0x7f005008))
8 #define UMCON0 (*((volatile unsigned long *)0x7f00500c))
9 #define UTRSTAT0 (*((volatile unsigned long *)0x7f005010))
10 #define UERSTAT0 (*((volatile unsigned long *)0x7f005014))
11 #define UFSTAT0 (*((volatile unsigned long *)0x7f005018))
12 #define UMSTAT0 (*((volatile unsigned long *)0x7f00501c))
13 #define UTXH0 (*((volatile unsigned long *)0x7f005020))
14 #define URXH0 (*((volatile unsigned long *)0x7f005024))
15 #define UBRDIV0 (*((volatile unsigned long *)0x7f005028))
16 #define UDIVSLOT0 (*((volatile unsigned long *)0x7f00502c))
17 #define UINTP0 (*((volatile unsigned long *)0x7f005030))
18 #define UINTSP0 (*((volatile unsigned long *)0x7f005034))
19 #define UINTM0 (*((volatile unsigned long *)0x7f005038))
20
21 void uart0_init(void)
22 {
23 GPACON &= ~0xff;
24 GPACON |= 0X22;
25
26 ULCON0 = 0x03; //data frame: 8n1
27 /*
28 clk: pclk
29 tx int type: level
30 rx int type: pulse
31 rx err int enable
32 tx/rx mode: interrupt or polling
33 */
34 UCON0 = 0x245;
35 UFCON0 = 0x00; //disable fifo;
36 UMCON0 = 0X00; //disable auto flow control(AFC)
37 /*
38 DIV_VAL = UBRDIV + (num of 1's in UDIVSLOT)/16
39 DIV_VAL = (PCLK/(bps*16))-1 = (66000000/115200)-1=34.8
40 UBRDIV = 34;
41 num of 1's in UDIVSLOT = 13;
42 */
43 UBRDIV0 = 0x22;
44 UDIVSLOT0 = 0x1fff;
45 }
46
47 int uart0_getc(void)
48 {
49 while (!(UTRSTAT0 & 0x1));
50 return (URXH0 & 0xff);
51 }
52
53 void uart0_putc(const char c)
54 {
55 while (!(UTRSTAT0 & 0x2));
56 UTXH0 = c;
57 if (c == 'n')
58 {
59 uart0_putc('r');
60 }
61 }
62
63 void uart0_puts(const char *s)
64 {
65 while (*s)
66 {
67 uart0_putc(*s++);
68 }
69 }
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