void printf_UART_Init(void)

{

    Pdc *    pdc_ptr = uart_get_pdc_base((Uart *)UART1);

    sam_uart_opt_t uart_settings;

    uart_settings.ul_mck = sysclk_get_peripheral_hz();

    uart_settings.ul_baudrate = 115200;

    uart_settings.ul_mode = UART_MR_PAR_NO;

    

    /* Enable the peripheral clock in the PMC. */

    sysclk_enable_peripheral_clock(ID_UART1);

    

    gpio_configure_group(PINS_UART1_PIO, PINS_UART1, PINS_UART1_FLAGS);

 

    uart_init(UART1, &uart_settings);

    uart_disable_interrupt(UART1, 0xffffffff);//取消UART1 中断

    

    uart_enable_tx(UART1);

    uart_enable_rx(UART1);

}





/*********************************************************************************************************

** 函数名称 ：

** 函数功能 ：向串口发送数据

** 入口参数 ：u32  snd_n：  发送数据的个数。snd_n 小于8

**  u8* RcvBufPt：缓存地址  

** 出口参数 ：无

**********************************************************************************************************/

u32 _SendBuf(const unsigned char *ptr,int len)

{

    int i;

    for (i = 0; i<len ; ++i)

    {

        while (!(UART1->UART_SR & UART_SR_TXRDY));

        UART1->UART_THR = ptr[i];

    }

    return len; 

} 



typedef struct __FILE FILE;



#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)



PUTCHAR_PROTOTYPE

{

    /* Place your implementation of fputc here */

    /* e.g. write a character to the USART */

    _SendBuf((const unsigned char *)&ch, 1);

    

    return ch;

}

custom\star89_s188\preloader\inc\Cust_bldr.h 

1打开

#define USE_DEBUG				0			/烧录IC必须为0********/

2

_near_func void uart_init(void) AT(MY_UART)

{

P0PU = 0;

P0PD = 0;
UART_BAUD = (24000000/(8 * 115200)) - 1;	//25;//0x37;					/* 25: cpu 24M, 115200bps*/	/*77 for 384*/ /*0x137 for 9600*/

UART_CON = 0x01;							/* enable uart */

P0DIR &= 0xBF;							/* P06 for transmit */
P0DIR |= 0x80;							/* P07 for receive */

//这里选择P06
//这里选择P24

/UART I/O-1/

//  P2DIR &= ~BIT(4);

//  P2DIR |= BIT(5);

//  IO_MC0 |= BIT(6);

}

串口打印



1.设置串口参数



2.重定向



3.勾选use mcrolib

初始化串口



void USART1_Config(void)  
{  
    /* USART configuration structure for USART1 */
    USART_InitTypeDef usart1_init_struct;
    /* Bit configuration structure for GPIOA PIN9 and PIN10 */
    GPIO_InitTypeDef gpioa_init_struct;

    /* Enalbe clock for USART1, AFIO and GPIOA */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO | 
                           RCC_APB2Periph_GPIOA, ENABLE);

    /* GPIOA PIN9 alternative function Tx */
    gpioa_init_struct.GPIO_Pin = GPIO_Pin_9;
    gpioa_init_struct.GPIO_Speed = GPIO_Speed_50MHz;
    gpioa_init_struct.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &gpioa_init_struct);
    /* GPIOA PIN9 alternative function Rx */
    gpioa_init_struct.GPIO_Pin = GPIO_Pin_10;
    gpioa_init_struct.GPIO_Speed = GPIO_Speed_50MHz;
    gpioa_init_struct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &gpioa_init_struct);

    /* Enable USART1 */
    USART_Cmd(USART1, ENABLE);  
    /* Baud rate 9600, 8-bit data, One stop bit
     * No parity, Do both Rx and Tx, No HW flow control
     */
    usart1_init_struct.USART_BaudRate = 115200;   
    usart1_init_struct.USART_WordLength = USART_WordLength_8b;  
    usart1_init_struct.USART_StopBits = USART_StopBits_1;   
    usart1_init_struct.USART_Parity = USART_Parity_No ;
    usart1_init_struct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    usart1_init_struct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    /* Configure USART1 */
    USART_Init(USART1, &usart1_init_struct);
    /* Enable RXNE interrupt */
    //USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    /* Enable USART1 global interrupt */
}

2.重定向



int fputc(int ch, FILE *f)  
{  
  USART_SendData(USART1,ch);  
  while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET);  
  return(ch);  
}  


int fgetc(FILE *f)  
{  
  while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);  

  return (int)USART_ReceiveData(USART1);  
} 

3.勾选microLib 


main.c



#include "stm32f10x.h"
#include "led.h"
#include "stm32f10x_rcc.h"
#include "misc.h"
#include "usart.h"
#include <stdio.h>
void Delay(uint32_t nCount){
    uint32_t i;
  for(i=0;i<nCount;i++);
}

int main(){
    LED_GPIO_Config();
  USART1_Config();
    while(1){
        LED1(ON);
        Delay(0xFFFFFF);
        LED1(OFF);
        Delay(0xFFFFFF);
        printf("2");
    }
}

源码: 
http://download.csdn.net/detail/aa375809600/9717144