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我昨天发布了一个类似的问题但是我无法编辑代码并发布更多问题，所以我在这里重新发布。我已将 gsm 调制解调器连接到 LPC2148，我正在向我的手机发送一条简单的消息“车辆”。我在两者之间添加了打印语句，以便我知道程序在哪里。它运行所有打印语句，但未发送消息！

所以这里是代码

主程序

    #include "i2c.h"                      
    #include "LPC214x.H"                                    // LPC2148 MPU Register
    #include <stdio.h>
    #include "gsm.h"
    #include "lcd.h"
    #include "buzzer.h"


    extern int msgflag;                                                     
    /* Main Program Start Here */
    int main(void)
    {  

       PINSEL0 = 0x00000000;        // Enable GPIO on all pins
    PINSEL1 = 0x00000000;
    PINSEL2 = 0x00000000;


      lcd_init();                                           // Initial LCD
      lcd_write_control(0x01);                              // Clear Display  (Clear Display,Set DD RAM Address=0) 
        goto_cursor(0x00);                                  // Set Cursor Line-1
        //lcd_print("gps");                     // Display LCD Line-1  
         lcd_print("gsm");
         gsmperform();  

 }

gsm.c

#include<lpc214x.h>                                                  /*Header file*/
#include "gsm.h"                                                     //header file
#include "lcd.h"
extern unsigned char cmgf[]="AT+CMGF=1";                            //Text format in GSM modem
extern unsigned char cmgs[]="AT+CMGS=\"+919844420844\"";            //Mobile number to which the msg is sent
//extern unsigned char msg[]="*\0";                                //secret code
extern unsigned char msg[]="vehicle";                                  //secret code
extern unsigned char readall[]="AT+CMGR=\"REC UNREAD\"\r\n";
//static unsigned char lat[10];
//static unsigned char lon[11];
//extern int blink;
unsigned char content[7];
void txu1(unsigned char data)                 //Transmit a byte of data through UART1
{
while(!(U1LSR & 0x20));                         // Wait until UART1 ready to send character  
    U1THR = data; 
    lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("data");                      // Display LCD Line-1  
}
unsigned char rxu1()
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}
/*unsigned char rxu0()
{
unsigned char p;
while ((U0LSR&0x01)!=1);
p=U0RBR;
return p;
}
*/
void sendstring(unsigned char *p)            //Sends a string of data through UART1
{
while(1)
{
if(*p=='\0') break;
txu1(*p++);
}
}
void delaygsm()                           //delay function
{
int i,j;
for(i=0;i<60000;i++)
for(j=0;j<51;j++);
}
void delay2()                             //delay function
{
int i,j;
for(i=0;i<60000;i++)
for(j=0;j<200;j++);
}
unsigned char recuart1()             //recieves a byte from UART1
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}






void sendmsg(void)
{

sendstring(cmgf);
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("cmgf");                      // Display LCD Line-1  
txu1(0x0d);                                     // equivalent of 
txu1(0x0a);                                     //   enter key
delaygsm();
sendstring(cmgs);
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("cmgs");                      // Display LCD Line-1  
txu1(0x0d);
txu1(0x0a);  
delaygsm();
sendstring(msg);
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("msg");                       // Display LCD Line-1  
//sendstring(lat);
//sendstring(lon);
txu1(0x1a);
delay2();
txu1(0x1a);
}
void initgsm()                               //Initialization of UART0,UART1 and ISR
{
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("begin init");                        // Display LCD Line-1  
    U0LCR=0x83;
U0DLL=0x61;
U0DLM=0x00;
U0LCR=0x03;
U1LCR=0x83;
U1DLL=0x61;
U1DLM=0x00;
U1LCR=0x03;
U1IER=0x01;
U1FCR=0x07;

*/
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("end init");                      // Display LCD Line-1 
    sendmsg();
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("in sendmsg");                        // Display LCD Line-1  

}
void gsmperform(void)
{
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("begin gsm");                     // Display LCD Line-1  
PINSEL0|=0x00050005;
PINSEL1|=0x00000000;
PINSEL2|=0x00000000;

/* nsk   PINSEL0 &= 0xFFF0FFFF;                                 // Reset P0.8,P0.9 Pin Config
  PINSEL0 |= 0x00010000;                                    // Select P0.8 = TxD(UART1)
  PINSEL0 |= 0x00040000;                                    // Select P0.9 = RxD(UART1)
  */


initgsm();
sendstring("ATe0\r\n");
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("ATe0");                      // Display LCD Line-1  
delaygsm();
sendstring("AT+CMGD=1,4\r\n");
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("AT+CMGD");                       // Display LCD Line-1  
delaygsm();
sendstring("AT+CNMI=1,0,0,0\r\n");
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("AT+CNMI");                       // Display LCD Line-1  
delaygsm();
lcd_write_control(0x01);                            // Clear Display  (Clear Display,Set DD RAM Address=0) 
    goto_cursor(0x00);                                  // Set Cursor Line-1
    lcd_print("end gsm");                       // Display LCD Line-1  
}
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1 回答 1

0

这里有几件事是处理 AT 命令的根本错误方法。

首先，从不，从不，从不，永远不要使用函数 delaygsm 之类的延迟。您必须更改处理逻辑，以便在发送命令后，您只需要从调制解调器读取响应，直到获得最终结果代码，然后再开始执行下一个命令。有关详细信息，请参阅此答案。

使用 ATE0 关闭 echo 只会让您解析的文本稍微少一些，但没有办法。您必须读取并解析调制解调器返回的响应。这并不复杂，只需按照上面链接的答案中给出的说明进行操作即可。

另请注意，AT 命令行应仅以'\r'（或写为0x0d）终止，仅此而已，有关详细信息，请参阅此答案。

于 2014-03-06T23:19:22.370 回答