main

SYSTEM/usart/usart.c

@@ -0,0 +1,150 @@
+#include "sys.h"
+#include "usart.h"	 
+
+////////////////////////////////////////////////////////////////////////////////// 	 
+//如果使用ucos,则包括下面的头文件即可.
+#if SYSTEM_SUPPORT_OS
+#include "includes.h"					//ucos 使用	  
+#endif
+  
+#if 1
+#pragma import(__use_no_semihosting)             
+//标准库需要的支持函数                 
+struct __FILE 
+{ 
+	int handle; 
+
+}; 
+
+FILE __stdout;       
+//定义_sys_exit()以避免使用半主机模式    
+void _sys_exit(int x) 
+{ 
+	x = x; 
+} 
+//重定义fputc函数 
+int fputc(int ch, FILE *f)
+{      
+	while((USART1->SR&0X40)==0);//循环发送,直到发送完毕   
+  USART1->DR = (u8) ch;      
+	return ch;
+}
+#endif 
+
+/*使用microLib的方法*/
+ /* 
+int fputc(int ch, FILE *f)
+{
+	USART_SendData(USART1, (uint8_t) ch);
+
+	while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}	
+   
+    return ch;
+}
+int GetKey (void)  { 
+
+    while (!(USART1->SR & USART_FLAG_RXNE));
+
+    return ((int)(USART1->DR & 0x1FF));
+}
+*/
+ 
+#if EN_USART1_RX   //如果使能了接收
+//串口1中断服务程序
+//注意,读取USARTx->SR能避免莫名其妙的错误   	
+char USART_RX_BUF[USART_REC_LEN];     //接收缓冲,最大USART_REC_LEN个字节.
+//接收状态
+//bit15，	接收完成标志
+//bit14，	接收到0x0d
+//bit13~0，	接收到的有效字节数目
+u16 USART_RX_STA=0;       //接收状态标记	  
+  
+void uart_init(u32 bound){
+  //GPIO端口设置
+  GPIO_InitTypeDef GPIO_InitStructure;
+	USART_InitTypeDef USART_InitStructure;
+	NVIC_InitTypeDef NVIC_InitStructure;
+	 
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);	//使能USART1，GPIOA时钟
+  
+	//USART1_TX   GPIOA.9
+  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
+  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
+  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
+   
+  //USART1_RX	  GPIOA.10初始化
+  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
+  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
+  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  
+
+  //Usart1 NVIC 配置
+  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
+	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//子优先级3
+	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ通道使能
+	NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器
+  
+   //USART 初始化设置
+
+	USART_InitStructure.USART_BaudRate = bound;//串口波特率
+	USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
+	USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
+	USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
+	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
+	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式
+
+  USART_Init(USART1, &USART_InitStructure); //初始化串口1
+  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
+  USART_Cmd(USART1, ENABLE);                    //使能串口1 
+
+}
+
+void USART1_IRQHandler(void)                	//串口1中断服务程序
+	{
+	u8 Res;
+#if SYSTEM_SUPPORT_OS 		//如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
+	OSIntEnter();    
+#endif
+	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)    判断读寄存器是否非空(RXNE)
+		{
+			
+			USART_ClearITPendingBit(USART1,USART_IT_RXNE); //收的地方可能会遇到相同问题，同样需要清标志
+		
+			
+		Res =USART_ReceiveData(USART1);	//读取接收到的数据
+		
+		if((USART_RX_STA&0x8000)==0)//接收未完成
+			{
+			if(USART_RX_STA&0x4000)//接收到了0x0d
+				{
+				if(Res!=0x0a)USART_RX_STA=0;//接收错误,重新开始
+				else USART_RX_STA|=0x8000;	//接收完成了 
+				}
+			else //还没收到0X0D
+				{	
+				if(Res==0x0d)USART_RX_STA|=0x4000;
+				else
+					{
+					USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
+					USART_RX_STA++;
+					if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//接收数据错误,重新开始接收	  
+					}		 
+				}
+			} 
+			
+			
+     }
+  //发的地方清标志
+  if(USART_GetFlagStatus(USART1,USART_FLAG_ORE) == SET) 
+  {
+    USART_ClearFlag(USART1,USART_FLAG_ORE);
+    USART_ReceiveData(USART1);
+  }
+	
+#if SYSTEM_SUPPORT_OS 	//如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
+	OSIntExit();  											 
+#endif
+} 
+#endif	
+

SYSTEM/usart/usart.h

@@ -0,0 +1,38 @@
+#ifndef __USART_H
+#define __USART_H
+#include "stdio.h"	
+#include "sys.h" 
+//////////////////////////////////////////////////////////////////////////////////	 
+//???????????????<3F><>????????????????????????<3F><>????
+//ALIENTEK STM32??????
+//????1?????		   
+//???????@ALIENTEK
+//???????:www.openedv.com
+//???????:2012/8/18
+//?<3F><>??V1.5
+//??????<3F><>?????????
+//Copyright(C) ?????????????????????? 2009-2019
+//All rights reserved
+//********************************************************************************
+//V1.3?????? 
+//???????????????????????????.
+//???????printf?????
+//??????????????????.
+//??????printf?????????????bug
+//V1.4??????
+//1,??????????IO??bug
+//2,?????USART_RX_STA,??????????????????2??14?<3F><>?
+//3,??????USART_REC_LEN,??????<3F><>???????????????????(??????2??14?<3F><>?)
+//4,?????EN_USART1_RX???????
+//V1.5??????
+//1,???????UCOSII?????
+#define USART_REC_LEN  			200  	//??????????????? 200
+#define EN_USART1_RX 			1		//????1??/?????0??????1????
+	  	
+extern char  USART_RX_BUF[USART_REC_LEN]; //???????,???USART_REC_LEN?????.????????<3F><>? 
+extern u16 USART_RX_STA;         		//?????????	
+//????????<3F><>??????????????????
+void uart_init(u32 bound);
+#endif
+
+