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我想從我的ARM7 LPC2148板發送消息。我已將SIM900 GSM調制解調器連接到電路板的UART0。但是我沒有收到我手機上的信息!!我已經把打印報告放在這裏和那裏，以便我知道系統在哪裏以及卡在哪裏。但它會打印所有消息。它說，即使我沒有收到任何短信，發送的消息。 下面是代碼：接口gsm與LPC2148
主代碼
#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("Accident Alert"); // Display LCD Line-1
// Display LCD Line-2
// Display Delay
// Clear Display (Clear Display,Set DD RAM Address=0)
// Display LCD Line-1
goto_cursor(0x40); // Set Cursor = Line-2
lcd_print("System"); // Display LCD Line-2
delay1(100000000);
gsmperform();
// Loop Print Message to LCD16 x 2 //
// Loop Continue
sendmsg();
msgflag=0;
lcd_write_control(0x01); // Clear Display (Clear Display,Set DD RAM Address=0)
goto_cursor(0x00); // Set Cursor Line-1
lcd_print("Message sent"); // Display LCD Line-1
}
gsm.c
#include<lpc214x.h> /*Header file*/
#include "gsm.h"
#include "lcd.h" //header file
extern unsigned char cmgf[]="AT+CMGF=1"; //Text format in GSM modem
extern unsigned char cmgs[]="AT+CMGS=\"9xxxxxxxxx\""; //Mobile number to which the msg is sent
extern unsigned char msg[]="hello"; //secret code
extern unsigned char readall[]="AT+CMGR=\"REC UNREAD\"\r\n";
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;
}
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 uart1_irq() __irq //ISR if anything is recieved in UART1, the same is transmitted through UART0
{
unsigned char p;
p=U1RBR;
if(p=='a')
{
sendmsg();
}
VICVectAddr=0;
}
void sendmsg(void)
{
sendstring(msg);
}
void initgsm() //Initialization of UART0,UART1 and ISR
{
U0LCR=0x83;
U0DLL=0x61;
U0DLM=0x00;
U0LCR=0x03;
U1LCR=0x83;
U1DLL=0x61;
U1DLM=0x00;
U1LCR=0x03;
U1IER=0x01;
U1FCR=0x07;
VICIntSelect&=0xffffff7f;
VICVectAddr2=(unsigned int)uart1_irq;
VICIntEnable|=0x00000080;
VICVectCntl2=0x20|7;
}
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;
initgsm();
sendstring("ATe0\r\n");
delaygsm();
sendstring("AT+CMGD=1,4\r\n");
delaygsm();
sendstring("AT+CNMI=1,0,0,0\r\n");
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
}
也許我錯過了一些東西，但是您沒有在您提供的代碼中發送任何短信。 「ATe0」關閉回聲，「AT + CGMD」刪除消息，「AT + CNMI」配置新的消息指示。 – Vicky
要發送的消息是你好。我已在msg []中定義。我應該怎麼做呢？我錯過了什麼/ – user3359953
嗯 - 你的代碼中沒有任何地方是你實際使用CGMS字符串的一開始。其次，有兩種方法可以使用AT + CGMS命令，無論是文本格式還是PDU格式。你似乎有一個邪惡的混合 - 我建議你閱讀AT命令文件。第三，我驚訝於'extern char foo [] =「blah」;'甚至編譯，我建議你在你的編譯器上打開/關閉警告。 – Vicky