程序代碼如下，
#define GPC0CON *((volatile unsigned int *)0xe0200060)
#define GPC0DAT*((volatile unsigned int *)0xe0200064)
#define GPA0CON*((volatile unsigned int *)0xe0200000)
#define GPA0DAT*((volatile unsigned int *)0xe0200004)
#define ULCON1 *((volatile unsigned int *)0xe2900400)
#define UCON1 *((volatile unsigned int *)0xe2900404)
#define UFCON1 *((volatile unsigned int *)0xe2900408)
#define UMCON1 *((volatile unsigned int *)0xe290040c)
#define UTRSTAT *((volatile unsigned int *)0xe2900410)
#define UERSTAT *((volatile unsigned int *)0xe2900414)
#define UFSTAT1 *((volatile unsigned int *)0xe2900418)
#define UMSTAT1 *((volatile unsigned int *)0xe290041c)
#define UTXH1 *((volatile unsigned int *)0xe2900420)
#define URXH1 *((volatile unsigned int *)0xe2900424)
#define UBRDIV1 *((volatile unsigned int *)0xe2900428)
#define UDIVSLOT *((volatile unsigned int *)0xe290042c)
#define UINTP1 *((volatile unsigned int *)0xe2900430)
#define UINTSP1 *((volatile unsigned int*)0xe2900434)
#define UINTM1 *((volatile unsigned int*)0xe2900438)
void delay(volatileunsigned int t)
{
volatile unsigned int base = 0xa000;
while(t--)
{
for(base=0xa000;base;--base);
}
}
voidled_tip(unsigned int control)
{
volatile unsigned int temp;
if(control==0x03)/*燈1閃爍*/
{
temp = ~GPC0DAT;
temp ^= ~(1<<3);
GPC0DAT = temp;
delay(4);
}
else if(control==0x0a)/*燈2閃爍*/
{
temp = ~GPC0DAT;
temp ^= ~(1<<4);
GPC0DAT = temp;
delay(4);
}
else if(control==0x30)/*雙燈交替閃爍*/
{
GPC0DAT = 0x08;
delay(2);
GPC0DAT = 0x10;
delay(2);
}
else if(control==0xa0)/*雙燈同閃*/
{
GPC0DAT = 0x18;
delay(2);
GPC0DAT = 0;
delay(2);
}
}
void led_init()
{
GPC0CON |= 0x11<<12;
}
void uart_init()
{
GPA0CON = 0x00220000;
ULCON1 = 0x00000003;
UCON1 = 0x00000005;
UFCON1 = 0x00000001;
UMCON1 = 0;
UBRDIV1 = 34;
UDIVSLOT = 0xdfdd;
}
static voidsend_byte(volatile unsigned char byte)
{
while((UFSTAT1 &(1<<24)));
UTXH1=byte;
}
static volatileunsigned char recv_byte()
{
while(!(UFSTAT1 & 0xff))
{
led_tip(0x03);
}
return URXH1;
}
voidputchar(volatile unsigned char c)
{
send_byte(c);
if(c=='\n') send_byte('\r');
}
volatile unsignedchar getchar()
{
volatile unsigned char c;
c = recv_byte();
return c;
}
void puts(volatilechar *str)
{
volatile char *p = str;
while(*p) putchar(*p++);
putchar('\n');
}
void uart()
{
volatile unsigned char c;
volatile unsigned int temp;
led_init();
uart_init();
puts("puts your key and thelight will be changed");
puts("1 led1");
puts("2 led2");
while(1)
{
c = getchar();
putchar(c);
putchar('\r');
if(c=='1')
{
//temp =GPC0DAT & (0x1<<3);
//temp^=0;
GPC0DAT =0x10;
}
else if(c=='2')
{
//temp =GPC0DAT & (0x1<<4);
//temp^=0;
//GPC0DAT&= temp;
GPC0DAT =0x08;
}
else
{
GPC0DAT =0x18;
}
led_tip(0x0a);
}
}
這裏出現的問題就是，
串口可以輸出提示信息，但是對於輸入沒有任何的反應，經過點燈的調試，知道在接收的函數裏面一直循環等待，uart()函數裏面的while循環裏面的點燈測試程序是沒有機會運行的。現在發現輸入1、2和發送字符1、2板子上的燈是有反應的，但是，輸入的字符並沒有顯示出來，這是爲什麼？
好吧，我現在發現這個錯誤了，尷尬並且表示非常的吃驚！問題代碼如下，
不知道爲什麼，這個地方需要換成’\n’或者不用，在後面判斷，最後的else是我現在才加的，不需要看。