51单片机向SIM800A发送AT指令,但SIM800A不发送信息是什么原因?

ID:1112757 · 发表于 2024-3-11 22:39

当单片机与电脑通信时，串口助手显示如下：

我独自用电脑操作串口助手发送AT指令，SIM800A成功发送信息：

但当我单片机与SIM800A通信时，SIM800A没有执行指令。想请教各位专家是什么原因？接线如下：

代码如下：

#include<REGX52.H>
#include<intrins.h>
#include "Delay.h"
#include "LCD1602.h"
#include "ADC0832.h"
#include<stdio.h>
#define FOSC_110592M
#define uchar unsigned char
#define uint unsigned int
unsigned int AD_X;
unsigned int AD_Y;
unsigned int rec_data_len_uart=0;
unsigned char idata Buffer_Uart0_Rec[25]={0};
void SerialInti()
{
TMOD=0x20;
#ifdef FOSC_12M
TH1=0xf3;
TL1=0xf3;
#else
TH1=0xfd;
TL1=0xfd;
#endif
TR1=1;
SM0=0;
SM1=1;
REN=1;
EA=1;
ES=1;
}
void Serial_interrupt() interrupt 4
{
unsigned char temp_rec_data_uart0;
temp_rec_data_uart0 = SBUF;
RI=0;
Buffer_Uart0_Rec[rec_data_len_uart]=temp_rec_data_uart0;
rec_data_len_uart++;
if(rec_data_len_uart>24)
{
rec_data_len_uart=0;
}
}
void Uart1Send(uchar c)
{
SBUF=c;
while(!TI);
TI=0;
}
void Uart1Sends(uchar *str)
{
while(*str!='\0')
{
Uart1Send(*str);
str++;
}
}
void main()
{
LCD_Init();
SerialInti();
LCD_ShowString(1,1,"X Y");
Delay(10000);
while(1)
{
AD_X=ADC0832(1);
LCD_ShowNum(2,1,AD_X,3);
AD_Y=ADC0832(0);
LCD_ShowNum(2,6,AD_Y,3);
if((AD_X<=47 || AD_X>=126) || (AD_Y>=141 || AD_Y<=57))
{
Uart1Sends("AT\r\n");
Delay(2000);
Uart1Sends("AT+CSCS=\"UCS2\"\r\n");
Delay(2000);
Uart1Sends("AT+CMGF=1\r\n");
Delay(2000);
Uart1Sends("AT+CSCA?\n");
Delay(2000);
Uart1Sends("AT+CSMP=17,167,0,25\r\n");
Delay(2000);
Uart1Sends("AT+CMGS=\"00310039003100360037003500340036003700320034\"\r\n");
Delay(2000);
Uart1Sends("4F7F7528800553EF80FD64545012FF0C8BF7524D5F800058005800585E2E52A9FF01");
Uart1Send(0x1a);
Delay(8000);
}
Delay(100);
}
}