STM32固件库3.5+uCOS2.86移植（转自暴走的工程师）

void uart_init(void)
{
u32 baudRate = 115200;//波特率
    float temp;
    u16 BRR_Value;
    u16 BRR_Mantissa;
    u16 BRR_Fraction;
   
    //定义时钟选择结构体
    RCC_ClocksTypeDef RCC_ClocksStatus;
   
    RCC_GetClocksFreq(&RCC_ClocksStatus);
    //选择PCLK2 为时钟 RCC设置里未分频，即72Mhz
    temp = (float)(RCC_ClocksStatus.PCLK2_Frequency)/(baudRate*16);

    BRR_Mantissa = (u32)temp;    //得到BRR[15:4]整数部分

    BRR_Fraction = (u32)(temp - BRR_Mantissa)*16;  //得到BRR[3:0]小数部分

    BRR_Mantissa<<=4;

    BRR_Value = BRR_Mantissa + BRR_Fraction;  //拼接整数和小数部分

    USART1->BRR = BRR_Value;  //设置波特比率
   
    USART1->CR1 |= 1<<13;    // Enable the USART by writing the UE bit in USART_CR1 register to 1
   
    USART1->CR1 |= 1<<2;    // Set the TE bit in USART_CR1 to send an idle frame as first transmission
   
    USART1->CR1 |= 1<<3;    //    Set the RE bit USART_CR1. This enables the receiver which begins searching for a start bit.
       

}
//我这个用库了。。不用库也一样。。没找到不用库的版本
void USART1_Puts(char * str)
{
    //USART_ClearFlag(USART1,USART_FLAG_TC); 清零TC用的，网上说法：“清除标志位，否则第1位数据会丢失”
    while(*str)
    {
        GPIO_ResetBits(GPIOF, GPIO_Pin_8);
        USART_SendData(USART1, *str++);

        while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
        {       
        }
        GPIO_SetBits(GPIOF, GPIO_Pin_8);
    }
}

主程序来一下~
int  main (void)
{
   OSInit();                                                  

   OSTaskCreateExt(AppStartTask,
                    (void *)0,
                    (OS_STK *)&AppStartTaskStk[TASK_STK_SIZE-1],
                    TASK_START_PRIO,
                    TASK_START_PRIO,
                    (OS_STK *)&AppStartTaskStk[0],
                    TASK_STK_SIZE,
                    (void *)0,
                    OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);
   
    OSStart();                             
}
再来个task任务~别忘了声明啊static  void  AppStartTask (void *p_arg);

static  void  AppStartTask (void *p_arg)
{
    (void)p_arg;
   
     USART1_Puts("aaaaa!\r\n");
   
     while(1) {
        delay();
    }
}