提醒：

如果您是完全按照《1.一步一步移植ucos到stm32f103開發版(修訂版)》來新建的工程的話，那很遺憾，你要重新建立一個工程，因為，在那篇文章的步驟1中，我們選中了GPIO，但是沒有選中USART，所以要新建一個工程，只是也要把USART選中

BSP.c文件中增加對串口的初始化及中斷的初始化：

void NVIC_Configuration(void)
{//EXTI_InitTypeDef EXTI_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;/* Configure the NVIC Preemption Priority Bits */  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);
}void USART_Config(USART_TypeDef* USARTx,u32 baud){USART_InitTypeDef USART_InitStructure;GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);//usart_init----------------------------------------------------/* Configure USART1 Rx (PA.10) as input floating */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_InitStructure);					 /* Configure USART1 Tx (PA.09) as alternate function push-pull */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_Init(GPIOA, &GPIO_InitStructure);USART_InitStructure.USART_BaudRate =baud;USART_InitStructure.USART_WordLength = USART_WordLength_8b;USART_InitStructure.USART_StopBits = USART_StopBits_1;USART_InitStructure.USART_Parity = USART_Parity_No;USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;/* Configure USART1 */USART_Init(USARTx, &USART_InitStructure);/* Enable USART1 Receive and Transmit interrupts */USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);//USART_ITConfig(USARTx, USART_IT_TXE, ENABLE);/* Enable the USART1 */USART_Cmd(USARTx, ENABLE);	//USART_ClearFlag(USARTx, USART_FLAG_TXE);
}void BSP_Init(void)
{/* System Clocks Configuration --72M*/RCC_Configuration();   GPIO_Configuration();NVIC_Configuration();USART_Config(USART1,115200);
}

APP目錄下新建USART.c文件，添加如下代碼：

#include <usart.h>void USART_OUT(USART_TypeDef* USARTx, uint8_t *Data,...){ const char *s;int d;char buf[16];va_list ap;va_start(ap, Data);while(*Data!=0){if(*Data==0x5c){switch (*++Data){case 'r':USART_SendData(USARTx, 0x0d);Data++;break;case 'n':USART_SendData(USARTx, 0x0a);	Data++;break;default:Data++;break;}}else if(*Data=='%'){switch (*++Data){case 's':s = va_arg(ap, const char *);for ( ; *s; s++) {USART_SendData(USARTx,*s);while(USART_GetFlagStatus(USARTx, USART_FLAG_TC)==RESET);}Data++;break;case 'd':d = va_arg(ap, int);itoa(d, buf, 10);for (s = buf; *s; s++) {USART_SendData(USARTx,*s);while(USART_GetFlagStatus(USARTx, USART_FLAG_TC)==RESET);}Data++;break;default:Data++;break;}		 }else{USART_SendData(USARTx, *Data++);}while(USART_GetFlagStatus(USARTx, USART_FLAG_TC)==RESET);}
}char *itoa(int value, char *string, int radix)
{int     i, d;int     flag = 0;char    *ptr = string;/* This implementation only works for decimal numbers. */if (radix != 10){*ptr = 0;return string;}if (!value){*ptr++ = 0x30;*ptr = 0;return string;}/* if this is a negative value insert the minus sign. */if (value < 0){*ptr++ = '-';/* Make the value positive. */value *= -1;}for (i = 10000; i > 0; i /= 10){d = value / i;if (d || flag){*ptr++ = (char)(d + 0x30);value -= (d * i);flag = 1;}}/* Null terminate the string. */*ptr = 0;return string;} /* NCL_Itoa */int SendChar (int ch)  {                /* Write character to Serial Port     */USART_SendData(USART1, (unsigned char) ch);while (!(USART1->SR & USART_FLAG_TXE));if(ch=='\r')SendChar('\n');return (ch);
}

新建usart.h文件：

<pre name="code" class="html">#ifndef __USART_H__
#define __USART_H__#include <includes.h>void USART_OUT(USART_TypeDef* USARTx, uint8_t *Data,...);
char *itoa(int value, char *string, int radix);
int SendChar (int ch);#endif

stm32f10x_it.c文件中添加串口中斷處理：

void USART1_IRQHandler(void)
{unsigned int i;unsigned char msg[50];OS_CPU_SR  cpu_sr;OS_ENTER_CRITICAL();OSIntNesting++;OS_EXIT_CRITICAL();//OSTimeTick();if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){	if(RxCounter1>20)RxCounter1=1;// Read one byte from the receive data register msg[RxCounter1++]= USART_ReceiveData(USART1);SendChar(msg[RxCounter1-1]);if(msg[RxCounter1-1]=='L'){msg[0]='L'; RxCounter1=1;}else if(msg[RxCounter1-1]=='F'){for(i=0; i< RxCounter1; i++){TxBuffer1[i]	=msg[i];}TxBuffer1[RxCounter1]=0;RxCounter1=0;//OSSemPost(Com1_SEM); 	  OSMboxPost(Com1_MBOX,(void *)&msg); 	                   }}if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET){ USART_ITConfig(USART1, USART_IT_TXE, DISABLE);}	OSIntExit();
}

APP.c文件中新建消息郵箱處理函數：

static  void Task_Com1(void *p_arg){INT8U err;	unsigned char * msg;(void)p_arg;	  				  while(1){msg=(unsigned char *)OSMboxPend(Com1_MBOX,0,&err);if(msg[0]=='L'&&msg[1]=='1'){milsec1=atoi(&msg[3]);USART_OUT(USART1,"\r\n");USART_OUT(USART1,"LED1: %d ms delay",milsec1);USART_OUT(USART1,"\r\n");}else if(msg[0]=='L'&&msg[1]=='2'){milsec2=atoi(&msg[3]);USART_OUT(USART1,"\r\n");USART_OUT(USART1,"LED2: %d ms delay",milsec2);USART_OUT(USART1,"\r\n");}}
}

并添加該任務：

 OSTaskCreateExt(Task_Com1,(void *)0,(OS_STK *)&Task_Com1Stk[Task_Com1_STK_SIZE-1],Task_Com1_PRIO,Task_Com1_PRIO,(OS_STK *)&Task_Com1Stk[0],Task_Com1_STK_SIZE,(void *)0,OS_TASK_OPT_STK_CHK|OS_TASK_OPT_STK_CLR);

新建一個頭文件globals.h：

#ifdef GLOBALS 
#define EXT
#else
#define EXT extern 
#endifEXT unsigned char TxBuffer1[400]; EXT unsigned char TxBuffer2[]; 
EXT unsigned char RxBuffer1[400];
EXT unsigned char RxBuffer2[];
EXT unsigned char TxCounter1;
EXT unsigned int TxCounter2;
EXT volatile unsigned int RxCounter1; 
EXT volatile unsigned int RxCounter2;EXT volatile unsigned char rec_f,tx_flag;
EXT volatile unsigned long Rec_Len;	
EXT volatile unsigned  int  milsec1,milsec2,milsec3;

將 globals.h 文件 include 到 APP.c 和?stm32f10x_it.c 中，注意，在APP.c文件 中應該先define?GLOBALS，即：

#define GLOBALS#include <globals.h>

APP.c文件中添加全局變量：

OS_EVENT* Com1_MBOX;

stm32f10x_it.c 中也添加該變量：

extern OS_EVENT* Com1_MBOX;

本工程在奮斗V5開發板測試通過：

通過串口連接開發板，可輸入L1 500F即可將Led1的閃爍速度設置為500ms，L2 600F即可將Led2的閃爍速度設置為600ms

總結

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