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How to write a program for reading short messages in sim900 with 5 1 single chip microcomputer?
/**********************************************************************************
* Project name: SMS control LED
* Description: Control the LED of the development board through SMS.
* experimental platform: C5 1
* Library version:
* Author: clay figurine communication module development platform team
* Blog:
* Taobao:
* Hardware connection description
Communication with GPRS module by serial port of single chip microcomputer
C5 1 GPRS module
p30(RXD)-& gt； receive data
p 3 1(TXD)->； TXD
GND->； GND
* Software function description
After the board is powered on, the RUNING _ LED will flash at a frequency of one second.
The mobile phone sends "onled" to light the LED；;
The mobile phone sends "offled" to turn off the LED.
**********************************************************************************/
# contains "config.h"
# contains "string.h"
# contains "delay.h"
# including "uart.h"
# define automatic _ startup1/defines that there is a self-startup function from the start of V 1.2.
# define buf 1 _ max 200// serial port 1 cache length
/* * * * * * * * * * Local constant statement * * * * * * * * *
sbit runing _ led = p 1^2； //Run indicator light
sbit led = p 1^3； //Control indicator light
/* * * * * * * * * * Local variable declaration * * * * * * * *
xdata u8 UART 1 _ Buf[Buf 1 _ Max]；
U8 times =0, First_Int = 0, Shi Jian = 0;
Bdata u8 logo; //Timer flag bit
Sbit timer 0 _ start = flag 0; //Timer 0 delays the start of the counter.
/* * * * * * * * * * Local function declaration * * * * * * * *
void GPIO _ config(void)； //pin initialization
void timer 0 init(void)； //Timer 0 initialization
void CLR _ buf 1(void)； //Clear the serial receive cache
u8 Find(u8 * a)； //Find a string
void Second_AT_Command(u8 *b，u8 *a，u8 wait _ time)； //Send instruction
void Wait _ CREG(void)； //Query waiting module registered successfully.
void Set _ Text _ Mode(void)； //Set SMS to text mode.
void Check _ New _ Message(void)； //Query new SMS
/* * * * * * * * * External function and variable declaration * * * * * * * * * * * * * * *
/*******************************************************************************
* function name: main
* Description: Main functions
* input:
* Output:
* return:
* Note: The baud rate of serial port is 9600, and the default baud rate of GPRS module is 1 15200, which needs to be modified by serial assistant.
Only 9600 can be used.
The program will delete the short messages on the mobile phone card. Please pay attention.
*******************************************************************************/
Invalid master (invalid)
{
timer 0 init()； //Initialize Timer 0
GPIO _ config()；
EA = 1； //Open host interrupt
UART 1 init()； //Initialize serial port 9600
wait _ CREG()； //Query waiting module registered successfully.
set _ Text _ Mode()； //Set SMS to text mode.
//Second _ AT _ Command(" AT+CMGD = 1，4 "，" OK "，3)； //Delete all messages on the card.
while( 1)
{
Check_New_Message()。
}
}
/*******************************************************************************
* function name: Uart 1
* Description: serial port 1 interrupt service entrance function.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
Invalid Uart 1 () interrupt 4
{
Intermediate frequency (RI)
{
RI = 0； //Clear the RI bit
UART 1 _ Buf[First _ Int]= SBUF； //Save the received string in the cache.
first _ int++； //The cache pointer moves backward.
if(First _ Int & gt； Buff1_ max)//If the cache is full, point the cache pointer to the first address of the cache.
{
first _ Int = 0；
}
}
Intermediate frequency (TI)
{
TI = 0； //clear the TI bit
}
}
/*******************************************************************************
* Function name: Timer0 _ ISR
* Description: Timer 0 interrupts the service input function every 20 milliseconds.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
Invalid timer 0_ISR () interrupt 1
{
Static u8time _ count = 0;
TR0 = 0； //Turn off the timer
TL0 = 0x00// Resets the initial value of the timer.
TH0 = 0xB8// Resets the initial value of the timer.
time _ count++；
if(Time _ count & gt； =50)
{
time _ count = 0；
running _ LED = ~ running _ LED；
}
If(count_20ms) //20ms delay counter
count _ 20 ms-；
If (timer 0_start)
times++；
if(Times & gt； (50 * Shi Jian))
{
Timer _ start = 0
Times = 0;
}
TR0 = 1； //Start the timer
}
/*******************************************************************************
* function name: GPIO_config
* Description: IO port configuration function
* input:
* Output:
* return:
* Note:
*******************************************************************************/
void gpio _ config(void)
{
LED = 1；
running _ LED = 1；
}
/*******************************************************************************
* Function name: Timer0init
* Description: Timer 0 is initialized and timed for 20 ms.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
void time r0 init(void)//20 ms @ 1 1.0592 MHz。
{
AUXR & amp= 0x7F///timer clock 12T mode
TMOD & amp； = 0xF0//
TMOD | = 0x 0 1； //Set the timer mode. 16-bit timer
TL0 = 0x00// Sets the initial value of the timer.
TH0 = 0xB8// Sets the initial value of the timer.
TF0 = 0； //Clear the TF0 flag
TR0 = 1； //Timer 0 starts counting.
ET0 = 1； //Enable Timer0 interrupt
}
/*******************************************************************************
* function name: CLR_Buf 1
* Description: Clear the cached data of serial port 2.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
void CLR_Buf 1(void)
{
u 16k；
for(k = 0； k & ltbuf 1 _ Max； K++) // Clears the cache content to zero.
{
UART 1 _ Buf[k]= 0x 00；
}
first _ Int = 0； //The starting storage location of the received string.
}
/*******************************************************************************
* function name: Find
* Description: Determines whether the cache contains the specified string.
* input:
* Output:
* Return: unsigned char:65438+ 0 specified characters found, but 0 specified characters not found.
* Note:
*******************************************************************************/
U8 lookup (u8 *a)
{
if(strstr(Uart 1_Buf，a)！ = empty)
Returns1;
other
Returns 0;
}
/*******************************************************************************
* function name: the second AT command
* Description: Function of sending AT command.
* Input: pointer for sending data, expected reply and waiting time for sending (unit: s).
* Output:
* return:
* Note:
*******************************************************************************/
void Second_AT_Command(u8 *b，u8 *a，u8 wait_time)
{
u8i；
u8 * c；
c = b； //save the string address to c.
CLR _ buf 1()；
I = 0；
while(i == 0)
{
If (! Find(a)// Find the character to answer.
{
If (Timer0 _ start = = 0)
{
b = c； //give the string address to B.
For (b; *b！ ='\0'; b++)
{
UART 1 _ send data(* b)；
}
UART 1 _ SendLR()；
Times = 0;
Shi Jian = wait _ time
Timer0 _ start =1;
}
}
other
{
I = 1；
Timer _ start = 0
}
}
CLR _ buf 1()；
}
/*******************************************************************************
* function name: Set_Text_Mode
* Remarks: Set SMS to text mode.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
Void Set_Text_Mode (invalid)
{
Second_AT_Command("ATE0 "，" OK "，3)； //Cancel echo
Second_AT_Command("AT+CNMI=3，2，0，0，0 "，" OK "，3)； //Directly output new short messages.
second _ AT _ Command(" AT+CMGF = 1 "，" OK "，3)； //Text mode
second _ AT _ Command(" AT+CPMS = \"SM\ "，\"SM\ "，\ " SM \ "，\ " OK "，3)； //All operations are performed in the SIM card.
}
/*******************************************************************************
* Function name: Check message record
* Description: Check whether there is any new information, and execute the information content instruction.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
Void Check_New_Message (invalid)
{
U8 temperature = 0;
if(strstr(Uart 1_Buf，"+CMT))！ = null)// If the cache string contains "+CMT", it means there is a new short message.
{
delay _ ms(3)； //Wait to receive all data.
if(strstr(Uart 1_Buf，" onled ")！ = empty)
{
LED = 0；
}
if(strstr(Uart 1_Buf，" offled ")！ = empty)
{
LED = 1；
}
CLR _ buf 1()；
//Second _ AT _ Command(" AT+CMGD = 1，4 "，" OK "，3)； //Delete SMS
}
}
/*******************************************************************************
* function name: Wait_CREG
* Note: Wait for the module to register successfully.
* input:
* Output:
* return:
* Note:
*******************************************************************************/
Void Wait_CREG (invalid)
{
u8i；
u8k；
I = 0；
CLR _ buf 1()；
while(i == 0)
{
CLR _ buf 1()；
UART 1 _ SendString(" AT+CREG？" ); //Query module network registration status
UART 1 _ SendLR()；
delay _ ms(250)；
for(k = 0； k & ltbuf 1 _ Max； k++)
{
if(Uart 1_Buf[k] == ':')
{
If ((UART1_ buf [k+4] ='1') | (UART1_ buf [k+4] =' 5')//indicates that the network registration is successful.
{
I = 1；
Break;
}
}
}
}
}
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