///////////////////////////////////////////////////////////////////////USART5.c
#include "sys.h"
#include "usart5.h"   

u8 USART5_RX_BUF[USART5_REC_LEN];     
u16 USART5_RX_STA=0;      
void uart5_init(u32 bound)
{

  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
  
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE);
  USART_DeInit(UART5);  
   
//USART5_TX   PC.12
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
   
//USART5_RX   PD.2
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOD, &GPIO_InitStructure);  
   
//Usart5 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   
NVIC_Init(&NVIC_InitStructure);
  
    //USART5 ³õʼ»¯ÉèÖÃ
USART_InitStructure.USART_BaudRate = bound;//ÉèÖÃΪ9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8λÊý¾Ý¸ñʽ
USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öֹͣλ
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæżУÑéλ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½
  USART_Init(UART5, &USART_InitStructure); //³õʼ»¯´®¿Ú
  USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);//¿ªÆôÖжÏ
  USART_Cmd(UART5, ENABLE);                    //ʹÄÜ´®¿Ú5
}
#if EN_USART5_RX   //Èç¹ûʹÄÜÁË´®¿Ú5½ÓÊÕ
void USART5_IRQHandler(void)
{
u8 res;
if (USART_GetITStatus(UART5, USART_IT_RXNE) != RESET)//½ÓÊÕµ½Êý¾Ý
{
  res = USART_ReceiveData(USART2);//¶ÁÈ¡½ÓÊÕµ½µÄÊý¾Ý
  if (USART5_RX_STA <24 )//&frac12;&Oacute;&Ecirc;&Otilde;&Atilde;&raquo;&Oacute;&ETH;&Iacute;ê&sup3;&Eacute;
  {
    USART5_RX_BUF[USART5_RX_STA] = res;  //&frac14;&Ccedil;&Acirc;&frac14;&frac12;&Oacute;&Ecirc;&Otilde;&micro;&frac12;&micro;&Auml;&Ouml;&micro;
        USART5_RX_STA++;   
  }
}
}
#endif
///////////////////////////////////////////////////////////////////////////数据传输函数
u8 RETURN_DATA_COMMAND[7]={0x5A,0xA5,0x20,0xF0,0x01,0x03,0x00};//&Iacute;¨&Ntilde;&para;&ETH;&shy;&Ograve;é&pound;&not;&raquo;&Oslash;&acute;&laquo;&Ecirc;&yacute;&frac34;&Yacute;&Atilde;ü&Aacute;&icirc;
u8 num_data=0;
u8 Show_Data_1[30] = { 0 };//LCD&Iuml;&Ocirc;&Ecirc;&frac34;&Ecirc;&yacute;×é1
u8 Show_Data_2[30] = { 0 };//LCD&Iuml;&Ocirc;&Ecirc;&frac34;&Ecirc;&yacute;×é2
u8 Tran_data[2];
void LoRa_SendData(void)
{
u16 adcx;                             //ADC&para;&Aacute;&Egrave;&iexcl;&Ecirc;&yacute;&Ouml;&micro;
u16 pull;                             //&Agrave;&shy;&Aacute;&brvbar;
u8 i,j=0;
u8 angle;
uart5_init(9600);                     //&acute;&reg;&iquest;&Uacute;5&sup3;&otilde;&Ecirc;&frac14;&raquo;&macr;&Icirc;&ordf;9600
USART5_RX_STA=0;
for(i=0;i<7;i++)                     //·&cent;&Euml;&Iacute;&Ecirc;&yacute;&frac34;&Yacute;&Atilde;ü&Aacute;&icirc;
{
  while(USART_GetFlagStatus(UART5,USART_FLAG_TC)==RESET);//&Ntilde;&shy;&raquo;··&cent;&Euml;&Iacute;,&Ouml;±&micro;&frac12;·&cent;&Euml;&Iacute;&Iacute;ê±&Iuml;
  USART_SendData(UART5,RETURN_DATA_COMMAND);
}
while(USART_GetFlagStatus(UART5,USART_FLAG_TC)==RESET);//&Ntilde;&shy;&raquo;··&cent;&Euml;&Iacute;,&Ouml;±&micro;&frac12;·&cent;&Euml;&Iacute;&Iacute;ê±&Iuml;

while(USART5_RX_STA != 24);
angle = USART5_RX_BUF[14],LED0=0;  
USART5_RX_STA = 0;
Tran_data[0]=angle;                             //&frac12;&laquo;&frac12;&Ccedil;&para;&Egrave;·&Aring;&Egrave;&euml;&Ecirc;&yacute;×é
adcx=Get_Adc_Average(ADC_Channel_1,10);
pull=(u16)(adcx*29400/4096);                    
Tran_data[1]=pull;                              //&frac12;&laquo;&Agrave;&shy;&Aacute;&brvbar;·&Aring;&Egrave;&euml;&Ecirc;&yacute;×é
for(i=0;i<2;i++)
{
  USART_SendData(USART2,Tran_data);
  while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);
}
//LCD&Iuml;&Ocirc;&Ecirc;&frac34;
sprintf((char*)Show_Data_1, "EXCAVATOR PULL:%5d N", pull);//&frac12;&laquo;×&Ouml;·&ucirc;&acute;&reg;·&Aring;&Egrave;&euml;Tran_Data_1&Ecirc;&yacute;×é&Ouml;&ETH;
sprintf((char*)Show_Data_2, "CABLE ANGLE:%5d D", angle);//&frac12;&laquo;×&Ouml;·&ucirc;&acute;&reg;·&Aring;&Egrave;&euml;Tran_Data_2&Ecirc;&yacute;×é&Ouml;&ETH;
POINT_COLOR=BLUE;
j=num_data%7;
switch(j)
{
  case 0CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION      ");num_data++;break;
  case 1CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION>");num_data++;break;
  case 2CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION>>");num_data++;break;
  case 3CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION>>>");num_data++;break;
  case 4CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION>>>>");num_data++;break;
  case 5CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION>>>>>");num_data++;break;
  case 6CD_ShowString(20,190,200,16,16,"DATA TRANSIMISSTION>>>>>>");num_data++;break;
}
if (num_data==7)
  num_data=0;
LCD_Fill(0, 210, 240, 280, WHITE); //&Ccedil;&aring;&sup3;&yacute;&Iuml;&Ocirc;&Ecirc;&frac34;
LCD_ShowString(25,230,320,16,16,Show_Data_1);//&Iuml;&Ocirc;&Ecirc;&frac34;&Agrave;&shy;&Aacute;&brvbar;&Ecirc;&yacute;&frac34;&Yacute;
LCD_ShowString(25,250,320,16,16,Show_Data_2);//&Iuml;&Ocirc;&Ecirc;&frac34;&frac12;&Ccedil;&para;&Egrave;&Ecirc;&yacute;&frac34;&Yacute;
memset((char*)USART5_RX_BUF, 0x00, 24);//&acute;&reg;&iquest;&Uacute;5&frac12;&Oacute;&Ecirc;&Otilde;&raquo;&ordm;&sup3;&aring;&Ccedil;&oslash;&Ccedil;&aring;0
delay_ms(500);
}

单片机将通信命令发送给传感器，传感器只能传回一次数据，但是程序就停止了，到底是什么问题？