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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
}

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void USART1_IRQHandler(void)
//串口1中断服务程序
{
u8 res;
res =USART_ReceiveData(USART1);	//读取接收到的数据
if(res=='$'||USART_RX_BUF[0]=='$')
{
if(res=='$')
i=0;
USART_RX_BUF[i]=res;
i++;
}
if(USART_RX_BUF[4]=='M'&&USART_RX_BUF[5]=='C')
{
if(res==',')
k++;
switch(k)
{
case 2:
if(res=='A'&&res!=',')
flag=1;
else
flag=0;
break;
case 3:
if(flag==1&&res!=','&&res!='.')
{	longitude*=10;
longitude+=res-48;}
break;
case 5:
if(flag==1&&res!=','&&res!='.')
{latitude*=10;
latitude+=res-48;}
break;
case 7:
if(flag==1&&res!=','&&res!='.')
{	speed*=10;
speed+=res-48;}
break;
}
}
if(USART_RX_BUF[4]=='G'&&USART_RX_BUF[5]=='A')
{
if(res==',')
p++;
switch(p)
{
case 9:
if(res!=','&&res!='.')
{
high*=10;
high+=res-48;
}
break;
}
if(res==0x0A)
{
memset(USART_RX_BUF,0x00,200);
i=0;
k=0;
a=longitude/10000000;
b=latitude/10000000;
c=speed/10*0.5144;
printf("longitude: %frn",a);
printf("latitude: %frn",b);
printf("speed: %frn",c);
printf("high: %frn",high/100);
longitude=0;
latitude=0;
speed=0;
}
}
}