s3c6410 uart 裸机 轮询 非fifo

/* uart 非中断模式R，轮询，不用fifo

*/

#include

#include "uart.h"

#include "gpio.h"

#include "sysc.h"

#define UART0 ( ( volatile UART_REGS * ) (UART_BASE))

u32 Inp32(u32 xx)

{

return  xx;

}

void GpioInit()

{

// 设置gpio ，使用uart0

u32 TEMP;

TEMP = GPIO->rGPIOACON;

TEMP &= ~(0XFF);

TEMP |= 0X22;

GPIO->rGPIOACON = TEMP;

}

// SEND 8byte,1 stop bit, no parity

void UartInit()

{

u32 TEMP;

 TEMP = Inp32(UART0->rULCON);

 TEMP |= 0X03;

 UART0->rULCON=TEMP;

 // SET RT MODE ,polling mode 

 TEMP = Inp32(UART0->rUCON);

 TEMP &=~(0xf);

 TEMP |= 0X5;

 UART0->rUCON=  TEMP;

 }

 char Getchar()

 {

 u8 TEMP;

while(!(UART0->rUTRSTAT &0X1));

TEMP = UART0->rURXH;

return TEMP;

 }

 void Sendchar(char x)

 {

while(!(UART0->rUTRSTAT & 0X4));

UART0->rUTXH = x;

 }

 void BaudInit(u32 Baudrate)

 {

 //设置波特率  ，公式给出，参照datasheet

u32 TEMP,temp;

SYSC_GetClkInform();

TEMP = (g_PCLK /(Baudrate*16))-1;

temp = TEMP;

TEMP = (int)TEMP;

UART0->rUBRDIV = TEMP;

temp -= TEMP;

temp = (int)(temp*16);

switch(temp){

case 0: TEMP = 0X0000; break;

case 1: TEMP = 0X0080; break;

case 2: TEMP = 0X0808; break;

case 3: TEMP = 0X0888; break;

case 4: TEMP = 0X2222; break;

case 5: TEMP = 0X4924; break;

case 6: TEMP = 0X4a52; break;

case 7: TEMP = 0X54aa; break;

case 8: TEMP = 0X5555; break;

case 9: TEMP = 0Xd555; break;

case 10: TEMP = 0Xd5d5; break;

case 11: TEMP = 0Xddd5; break;

case 12: TEMP = 0Xdddd; break;

case 13: TEMP = 0Xdfdd; break;

case 14: TEMP = 0Xdfdf; break;

case 15: TEMP = 0Xffdf; break;

}

UART0->rUDIVSLOT = TEMP;

 }

 int main()

 {

u8 ch;

UartInit();

BaudInit(9600);

while(1)

{

Sendchar('x');

ch= Getchar();

if(ch == 'x')

Sendchar('y');

}

}

可以参照datasheet，要大胆尝试，试一试就出来了