 |
 |
| View previous topic :: View next topic |
| Author |
Message |
madtoilet
Joined: 02 Apr 2008
Posts: 36
|
| issues with the pic to send and receive serially |
 Posted: Wed Apr 23, 2008 6:14 pm |
 |
|
I know that there are a couple of topics on this and i've been looking through them but i'd like to know if there are any thoughts on why this code isn't working
| Code: |
#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT, NOLVP
#use delay(clock=4mhz)
void receive_text(void);
byte number[11]="5 ";
void main()
{
output_low(PIN_B6);
delay_ms(500);
output_high(PIN_B6);
delay_ms(2000);
output_low(PIN_B6);
//output_b(0x00);
delay_ms(20000);
receive_text();
}
void receive_text(void)
{
#use rs232(baud=4800, bits=8, parity=N, stop=1, xmit=PIN_C6, rcv=PIN_C7, stream=GSM, ERRORS)
unsigned char temp[70];
byte ch =0;
int count=0;
int count2=10;
int count3=0;
fprintf(GSM,"AT+CMGF=1\r\n");
delay_ms(100);
//20 spots to first number
fprintf(GSM,"AT+CMGR=2\r\n"); //Read SMS at location 1
delay_ms(3000);
//output_high(PIN_B3);
if(kbhit())
output_high(PIN_B3);
start:
ch = fgetc(GSM);
if(ch == '5' || ch == 0x35){
output_high(PIN_B0);
while(count2 !=0){
ch = fgetc(GSM);
number[count2] = ch;
count2--;
}
if(ch == '\r')
break;
}
count3++;
if(count3 == 40){
goto breaker;}
goto start;
breaker:
break;
/*
fprintf(GSM, "AT+CMGD=1\r\n");//delete sms at location 1
delay_ms(10);
*/
} |
the main thing i want is for it to see the number '5' in the text. I know there is a number 5 in there when i checked it on the pc. |
|
 |
ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
|
|
| Posted: Wed Apr 23, 2008 7:20 pm |
|
|
| Code: | fprintf(GSM,"AT+CMGR=2\r\n"); //Read SMS at location 1
delay_ms(3000); |
How much time do you think it will take before the phone sends the response?
Let's assume this will take less than your 3 seconds then the small buffer in the PIC's UART will store the first three characters before overflowing and ignoring all other incoming data. Most likely the the first data received is 'OK\n', so the buffer has overflown and locked even before the SMS data is sent to the PIC.
I suggest you use another mechanism for receiving the data based on interrupts, for an example see the file ex_sisr.c in the CCS Example directory. |
|
|
madtoilet
Joined: 02 Apr 2008
Posts: 36
|
|
| Posted: Thu Apr 24, 2008 3:02 pm |
|
|
hey,
thanks. I'm now applying the buffer to my code. One of my concerns is that if in my rs232 setting i have 'stream=GSM', can i still use
c = bgetc();
to obtain my information or do i have to change my buffer to work with the stream? |
|
|
madtoilet
Joined: 02 Apr 2008
Posts: 36
|
|
| Posted: Thu Apr 24, 2008 4:41 pm |
|
|
this is what my code looks like now
| Code: |
#include "G:\Senior Project\base2\base2.h"
#include <string.h>
#fuses HS,NOWDT,NOPROTECT, NOLVP
#use delay(clock=4mhz)
//#include <lcd.h>
#define BUFFER_SIZE 32
BYTE buffer[BUFFER_SIZE];
BYTE next_in = 0;
BYTE next_out = 0;
#int_rda
void serial_isr() {
int t;
buffer[next_in]= getc();
t=next_in;
next_in=(next_in+1) % BUFFER_SIZE;
if(next_in==next_out)
next_in=t; // Buffer full !!
}
#define bkbhit (next_in!=next_out)
BYTE bgetc() {
BYTE c;
while(!bkbhit) ;
c=buffer[next_out];
next_out=(next_out+1) % BUFFER_SIZE;
return(c);
}
void receive_text(void);
void test_gsm(void);
char number[11]="5 ";
void main()
{
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
enable_interrupts(int_rda);
enable_interrupts(global);
setup_low_volt_detect(FALSE);
setup_oscillator(False);
output_low(PIN_B6);
delay_ms(500);
output_high(PIN_B6);
delay_ms(2000);
output_low(PIN_B6);
//output_b(0x00);
delay_ms(2000);
receive_text();
//test_gsm();
}
void receive_text(void)
{
#use rs232(baud=4800, bits=8, parity=N, stop=1, xmit=PIN_C6, rcv=PIN_C7, stream=GSM, ERRORS)
unsigned char temp[70];
byte ch =0;
int count=0;
int count2=10;
int count3=0;
fprintf(GSM,"AT+CMGF=1\r\n");
delay_ms(100);
//20 spots to first number
fprintf(GSM,"AT+CMGR=2\r\n"); //Read SMS at location 1
delay_ms(1);
output_low(PIN_B0);
//output_high(PIN_B3);
while(TRUE){
start:
ch = bgetc();
if(ch == '5' || ch == 0x35){
output_high(PIN_B0);
while(count2 !=0){
ch = bgetc();
number[count2] = ch;
count2--;
}
if(ch == '\r')
break;
}
}
count3++;
if(count3 == 40){
goto breaker;}
goto start;
breaker:
break;
/*
fprintf(GSM, "AT+CMGD=1\r\n");//delete sms at location 1
delay_ms(10);
*/
} |
the gotos and the breaker: parts were for trouble shooting.
i'm having trouble figuring out what could be wrong. It's still not seeing the character that i want. |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
