昨天我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。我已经将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”。我在两者之间插入了打印语句，以便我知道程序的位置。它运行所有打印语句，但不发送消息！
所以这是代码
MAIN.C
#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
}
答案 0 :(得分：0)
这里有一些基本上是处理AT命令的错误方法。
首先，从来没有，永远不会使用像延迟函数这样的延迟。您必须更改处理逻辑，以便在发送命令后，除了从调制解调器读取响应之外，您绝对不会做任何事情，直到您在开始执行下一个命令之前获得最终结果代码。有关详细信息，请参阅this answer。
使用ATE0关闭回声只会让您解析的文本略少，但无法绕过。您必须阅读并解析调制解调器返回的响应。它并不复杂，只需按照上面连接的答案给出的指示。
另请注意，AT命令行应仅以'\r'（或写为0x0d）终止，而不是其他内容，有关详细信息，请参阅this answer。