#include "usart3.h"

//串口接收缓存区 	
u8 USART3_RX_BUF[USART3_MAX_RECV_LEN]; 				//接收缓冲,最大USART3_MAX_RECV_LEN个字节.
u8  USART3_TX_BUF[USART3_MAX_SEND_LEN]; 			//发送缓冲,最大USART3_MAX_SEND_LEN字节
vu16 point1 = 0;


void USART3_Configuration(u32 baund)
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
	
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);	//使能USART3
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);	//GPIOB时钟
    
	  //NVIC_Configuration();
	
 	  USART_DeInit(USART3);  //复位串口1
    
	 //USART3_TX   PB.10  PB.11
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;	
    GPIO_Init(GPIOB, &GPIO_InitStructure); 
    

	  GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_USART3);
	  GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART3);
    
    
    USART_InitStructure.USART_BaudRate = baund;
    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;
    USART_Init(USART3,&USART_InitStructure);
		
    USART_Cmd(USART3,ENABLE);
		
		USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);//开启USART3的接收中断
		//Usart1 NVIC 配置
		NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;//串口3中断通道
		NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//抢占优先级3
		NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;		//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_ClearFlag(USART3,USART_FLAG_TC); //清除发送完成标志位 
		
}



void USART3_IRQHandler(void)
{
	u8 Res;
	if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) 
	{
		Res =USART_ReceiveData(USART3);//(USART1->DR);	//读取接收到的数据
	
	if(Res == 0x24)
	{
		point1 = 0;	
	}
		

	  USART3_RX_BUF[point1++] = Res;

	if(USART3_RX_BUF[0] == '$' && USART3_RX_BUF[4] == 'M' && USART3_RX_BUF[5] == 'C')			//确定是否收到"GPRMC/GNRMC"这一帧数据
	{
		if(Res == '\n')									   
		{
			memset(Save_Data.GPS_Buffer, 0, GPS_Buffer_Length);      //清空
			memcpy(Save_Data.GPS_Buffer, USART3_RX_BUF, point1); 	//保存数据
			Save_Data.isGetData = 1;
			point1 = 0;
			memset(USART3_RX_BUF, 0, USART3_MAX_RECV_LEN);      //清空				
		}	
				
	}
//	if(USART3_RX_BUF[0] == '$' && USART3_RX_BUF[3] == 'G'&& USART3_RX_BUF[4] == 'G' && USART3_RX_BUF[5] == 'A')			//确定是否收到"GPRMC/GNRMC"这一帧数据
//	{
//		if(Res == '\n')									   
//		{
//			memset(Save_Data.GGA_Buffer, 0, GPS_Buffer_Length);      //清空
//			memcpy(Save_Data.GGA_Buffer, USART3_RX_BUF, point1); 	//保存数据
//			Save_Data.isGetData = true;
//			point1 = 0;
//			memset(USART3_RX_BUF, 0, USART3_MAX_RECV_LEN);      //清空				
//		}	
//				
//	}
	if(point1 >= (USART3_MAX_RECV_LEN-1))
	{
		point1 = 0;
	}	
   }			 											 
}   

//串口3,printf 函数
//确保一次发送数据不超过USART3_MAX_SEND_LEN字节
void u3_printf(char* fmt,...)  
{  
	u16 i,j; 
	va_list ap; 
	va_start(ap,fmt);
	vsprintf((char*)USART3_TX_BUF,fmt,ap);
	va_end(ap);
	i=strlen((const char*)USART3_TX_BUF);		//此次发送数据的长度
	for(j=0;j<i;j++)							//循环发送数据
	{
	  while(USART_GetFlagStatus(USART3,USART_FLAG_TC)==RESET); //循环发送,直到发送完毕   
		USART_SendData(USART3,USART3_TX_BUF[j]); 
	} 
}