#include "usart1.h"	 
//#include "math.h"
#include <stdlib.h>

u8 USART_RX_BUF[64];
//接收到的数据长度		  
unsigned short USART_RX_STA=0;       //接收状态标志 

float error;
void USART1_IRQHandler(void)   //串口1中断程序
{
	unsigned char Res;
	
	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //
	{
		Res =USART_ReceiveData(USART1);	//读取接收到的字节
		
		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
					USART_RX_BUF[USART_RX_STA&0X3FFF]='\0';   //最后一个字节放'0’，方便判断
				}
			}
			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>(64-1))USART_RX_STA=0;  //接收错误，重新开始  
				}		 
			}
		}	
		if((USART_RX_STA&0x8000)!=0)
		{
			TX_485;
			switch(USART_RX_BUF[0])
			{
				case 'y':   //D
					error = atof((const char *)(USART_RX_BUF+1));
//					error = fabs(error) > 0.02 ? error : 0 ;
					break;
			}
			RX_485;
			USART_RX_STA=0;	
		}
		
  }
}


int fputc(int ch,FILE *p)  //函数默认的，在使用printf函数时自动调用
{
	USART_SendData(USART1,(u8)ch);	
	while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
	return ch;
}

//初始化IO 串口1
//pclk1:PCLK1时钟频率(Mhz)
//bound:波特率	  
void usart1_Init(u32 bound)
{
   //GPIO端口设置
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//TX			   //串口输出PA9
	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);  /* 初始化串口输入IO */
	
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//RX			 //串口输入PA10
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;		  //模拟输入
	GPIO_Init(GPIOA,&GPIO_InitStructure); /* 初始化GPIO */
	

	//USART1 初始化设置
	USART_InitStructure.USART_BaudRate = bound;//波特率设置
	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_Cmd(USART1, ENABLE);  //使能串口1 
	
	USART_ClearFlag(USART1, USART_FLAG_TC);
		
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启相关中断

	//Usart1 NVIC 配置
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//抢占优先级2
	NVIC_InitStructure.NVIC_IRQChannelSubPriority =2;		//子优先级1
	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

	RX_485; 
	
}