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kavinyang
Joined: 17 Apr 2008
Posts: 4
Location: USA
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| Need help with this GSM isr please |
 Posted: Wed Jul 02, 2008 9:02 pm |
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I know that there are SMS message to be retrieve because
when i first stored a message to it using hyper terminal, by
setting the modem to text mode and sent a text message to the
GSM modem, well the SMS message is stored in the location index number 1
and I'm trying to read from it by using PIC but I'm not getting anything base on my
interrupt.
i set the modem to text mode first by sending:
AT+CMGF =1 ; put modem in text mode ; modem return OK
AT+CMGR =1 ;read at index location 1 on GSM modem ; modem return OK
when I'm reading, i set my isr() to get whatever the modem is returning to the PIC and had it display on LCD
but I'm not getting anything :(
this is my code:
| Code: | #int_rda
void serial_isr()
{
output_low(PIN_B5);
char_rcvd = fgetc(GSM);
while (i != 10)
{
char_rcvd = fgetc(GSM);
data[i]=char_rcvd;
t=1;
i++;
}
data[i] = 0; // return new line shows that all character has been collected
output_low(PIN_B4);
disable_interrupts(int_rda);
}
void readindex(void)
{
while(1){
output_high(PIN_B7);
delay_ms(1000);
fprintf(GSM, "AT+CMGF= 1"); //set to text mode
fprintf(GSM, "\r\n");
delay_ms(2000);
output_high(PIN_B6);
fprintf(GSM, "AT+CMGS= (my number)r\n"); //write text message
delay_ms(1000);
fprintf(GSM, "HELLO WORLD");
fputc(0x1A,GSM);//CTR+Z to send
fprintf(GSM, "\r\n");
delay_ms(100);
output_low(PIN_B2);
fprintf(GSM, "AT+CMGR=1"); //Read SMS at location 1
fprintf(GSM, "\r\n");
delay_ms(1);
enable_interrupts(int_rda);
delay_ms(2000);
output_low(PIN_B6);
delay_ms(500);
output_low(PIN_B7);
while(t!=1){} // wait til interrupt
t = 0;
disable_interrupts(int_rda);
delay_ms(100);
cursor_position(0x84);
out_lcd_string(data); //send display reading string to LCD
output_high(PIN_B2);
}
} |
_________________
PHIA YANG |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jul 02, 2008 10:56 pm |
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Don't do your isr code like that. It's wrong. You should only get one
character each time the isr is called.
See some of the comments in this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=34648
Also, you need to simplify your program for the first test. Make it shorter.
You should be able to write a short program (maybe 30 lines) that tests
the ability to talk to the GSM.
If you post another program, make sure it's complete. Post the
#include, #fuses, #use delay(), and #use rs232() statements.
Post the main(). The "30 lines of code" includes all these things. |
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