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发表于 2017-1-9 17:09:50
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#include "usart2.h"
u8 USART2_Rec_Over_Flag = 0;
u16 USART2_Recv_Len = 0;
u8 USART2_RX_BUF[USART2_MAX_RECV_LEN] = {0};
//初始化IO 串口2
//bound:波特率
void uart2_init(u32 bound)
{
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2时钟
//串口3对应引脚复用映射
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //GPIOA2复用为USART2
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //GPIOA3复用为USART2
//USART2端口配置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; //GPIOA2与GPIOA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA2，PA3
//USART2 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(USART2, &USART_InitStructure); //初始化串口2
USART_Cmd(USART2, ENABLE); //使能串口2
USART_ClearFlag(USART2, USART_FLAG_TC);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启相关中断
//Usart2 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;//串口2中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//抢占优先级2
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、
}
//通用定时器3 中断初始化
//arr：自动重装值。 psc：时钟预分频数
//定时器溢出时间计算方法:Tout=((arr+1)*(psc+1))/Ft us.
//Ft=定时器工作频率,单位:Mhz
//这里使用的是定时器 3!
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); //①使能TIM3 时钟
TIM_TimeBaseInitStructure.TIM_Period = arr; //自动重装载值
TIM_TimeBaseInitStructure.TIM_Prescaler=psc; //定时器分频
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);// ②初始化定时器 TIM3
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //③允许定时器 3 更新中断
TIM_ClearITPendingBit(TIM3,TIM_IT_Update); //清除中断标志位
NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; //定时器3 中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //抢占优先级 1
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03; //响应优先级 3
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);// ④初始化 NVIC
//TIM_Cmd(TIM3,ENABLE); //⑤使能定时器 3
}
//串口2中断函数
void USART2_IRQHandler(void)
{
u8 Res;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //判断RXNE接收中断标志是否等于0
{
Res = USART_ReceiveData(USART2); //读数据
if(USART2_Recv_Len<USART2_MAX_RECV_LEN) //判断是否还能接收数据
{
TIM_SetCounter(TIM3, 0); //将定时器3的计数清0,又从0开始计数
if(USART2_Rec_Over_Flag == 0)TIM3_Set(1); //如果没接收完数据就打开定时器3
USART2_RX_BUF[USART2_Recv_Len++] = Res;//把数据放入数组，注意住程序中处理完数据别忘了把USART2_Rec_Over_Flag置0
}else{USART2_Rec_Over_Flag = 1;}
}
}
//定时器打开关闭函数，实参1为开，0为关
void TIM3_Set(u8 sta)
{
if(sta)
{
TIM_SetCounter(TIM3, 0); //计数器3计数清零
TIM_Cmd(TIM3, ENABLE); //使能计数器
}else{TIM_Cmd(TIM3, DISABLE);} //失能计数器
}
//定时器3中断用于把接收完成标志USART2_Rec_Over_Flag置1
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //是否发生计数器2中断
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清楚计数器中断
USART2_Rec_Over_Flag = 1; //接收完成标志置1，注意主程序中处理完数据要把他置0
TIM3_Set(0); //关闭定时器3
}
}
/**********************************************************
*
*1，要发送的数组
*2，要发送的长度
**********************************************************/
void Usart2_Send_Data(u8 *buf,u16 len)
{
u16 t;
for(t=0;t<len;t++) //循环发送数据
{
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET); //等待发送完成
USART_SendData(USART2,buf[t]);
}
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
}
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