stm32f103c8用串口2接受字符串，串口1发出对应数组的问题 -

#include "usart.h"
#include "led.h"
#include "SysTick.h"
#include "string.h"
#include "DFPlayer.h"
/*******************************************************************************
* 函数名 : USART1_Init
* 函数功能 : USART1初始化函数
* 输入 : bound:波特率
* 输出 : 无
*******************************************************************************/
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);
/* 配置GPIO的模式和IO口 */
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
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
//Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
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、
}
/*******************************************************************************
* 函数名 : USART1_Send_Data
* 函数功能 : USART1发送函数
* 输入 : buf
* 输入 : len
* 输出 : 无
*******************************************************************************/
void USART1_Send_Data(u8 *buf,uint16_t len)
{
u8 t=0;
for(t=0;t<len;t++) //循环发送数据
{
USART_SendData(USART1,buf[t] );
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
}
}
/*******************************************************************************
* 函数名 : uart2_init
* 函数功能 : IO端口及串口2，时钟初始化函数 A2,A3
* 输入 : 无
* 输出 : 无
*******************************************************************************/
void USART2_Init(u32 bt)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量，用来初始化GPIO
//使能串口的RCC时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能UART3所在GPIOB的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//串口使用的GPIO口配置
// Configure USART2 Rx (PB.11) as input floating
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Configure USART2 Tx (PB.10) as alternate function push-pull
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//配置串口
USART_InitStructure.USART_BaudRate = bt;
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;
// Configure USART
USART_Init(USART2, &USART_InitStructure);//配置串口
// Enable USART1 Receive interrupts 使能串口接收中断
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//串口发送中断在发送数据时开启
//USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
// Enable the USART3
USART_Cmd(USART2, ENABLE);//使能串口
//串口中断配置
//Configure the NVIC Preemption Priority Bits
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
// Enable the USART Interrupt
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
char USART_ReceiveString[50]; //接收PC端发送过来的字符
int Receive_Flag = 0; //接收消息标志位
int Receive_sum = 0; //数组下标
void USART2_IRQHandler(void) //中断
{
if(USART_GetITStatus(USART2,USART_IT_RXNE) == 1) //USART_FLAG_RXNE判断数据，== 1则有数据
{
if(Receive_sum > 49) //数组能存放50个字节的数据
{
USART_ReceiveString[49] = '\0'; //数据字节超过50位时，将最后一位设置为\0
Receive_Flag = 1; //接收标志位置1，停止接收数据
Receive_sum = 0; //数组下标置0
}
if(Receive_Flag == 0) //接收标志位等于0，开始接收数据
{
USART_ReceiveString[Receive_sum] = USART_ReceiveData(USART2); //通过USART2串口接收字符
Receive_sum++; //数组下标++
}
if(Receive_sum >= 2) //数组下标大于2
{
if(USART_ReceiveString[Receive_sum-2] == '\r' && USART_ReceiveString[Receive_sum-1] == '\n' )
{
USART_ReceiveString[Receive_sum-1] = '\0';
USART_ReceiveString[Receive_sum-2] = '\0';
Receive_Flag = 1; //接收标志位置1，停止接收数据
Receive_sum = 0; //数组下标置0
if(strcmp(USART_ReceiveString,"batteriesHarmful") == 0)
{
led1=!led1;
}
if(strcmp(USART_ReceiveString,"cansRecyclable") == 0)
{
Uart_DFPlayer(0x03 , 0x02) ;
}
if(strcmp(USART_ReceiveString,"cartonRecyclable") == 0)
{
Uart_DFPlayer(0x03 , 0x03) ;
}
if(strcmp(USART_ReceiveString,"cigaretteDry") == 0)
{
Uart_DFPlayer(0x03 , 0x04) ;
}
if(strcmp(USART_ReceiveString,"tissueDry") == 0)
{
Uart_DFPlayer(0x03 , 0x05) ;
}
Receive_Flag = 0;
}
}
USART_ClearITPendingBit(USART2,USART_IT_RXNE); //接收后先清空标志位
}
}

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