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carlosma
Joined: 24 Mar 2004
Posts: 53
Location: Portugal
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| Error Read SMS or String from Uart |
 Posted: Fri Jul 09, 2004 6:00 pm |
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Hello
my program read a String from Uart (hardware port), with Interrupt Int_rda, and #int_ext for PC programing.
I can't read the data incoming by Modem GSM on #int_rda.
When I test with hyperterminal all the system work fine but not with modem.
Only wanted to read the "RING" or "OK" from Modem and compare with existing String.
Thank You
some code:
| Code: |
#use delay(clock=16000000)
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7, STREAM=COM_B) //hardware
#USE RS232(BAUD=9600, XMIT=PIN_B1, RCV=PIN_B0, STREAM=COM_A)
//...
#int_rda //read from COM_B
void vira()
{
char c;
c=fgetc(COM_B);
if ((c>=' ')&&(c<='~'))
{
buffer1[len] = c;
len++;
}
if(c==0x0A ||c==0x0D) // I gues End Of String
{
bit_com_b=1; // All OK
}
if(len >= BUFFER_SIZE)
{
//bit_set(ModemFlag,RecErr); // Something wrong !!
disable_interrupts(INT_RDA); // Get out & ovoid reentrance
len=0;
}
fputc(c, COM_A);//just for test arrive char
}
#int_ext
void seirala_isr()
{
cmd=fgetc(COM_A);
cmd=toupper(cmd);
fputc(cmd, COM_A);
}
//..
// now, read and compare with String "RING" or "OK"
read_eeprom_string(s, ROM_ackmodem, ROM_askmodem_SIZE);
if (strncmp (buffer1, s, 5)==0)
{
fprintf(COM_A,"\r\nComutado\r\n");
disable_interrupts(INT_RDA);//disable interrupt port b
fprintf(COM_B,"AT+CMGR=1\n");
delay_us( 1000 );
enable_interrupts(INT_RDA);
len=0;
bit_com_b=0;
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jul 09, 2004 8:37 pm |
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You didn't show your setup code for the soft USART.
Since you're using Pin B0 with INT_EXT, you need
to set the edge of the waveform which will cause the
interrupt. Since a start bit at the PIC is a logic Low Level,
you need to interrupt on the falling edge. The PIC defaults
to using the rising edge. That might explain why it doesn't
work. You need to put these lines near the start of main(),
as shown below.
| Code: |
#bit INTF_BIT = 0x0B.1 // This address is for the 16F877
void main()
{
output_float(PIN_B0); // Set pin B0 as an input
output_high(PIN_B1); // set pin B1 as an output
ext_int_edge(H_TO_L); // Interrupt at beginning of Start bit
INTF_BIT = 0; // Clear ext. int. flag before enabling interrupts
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);
// Put other code here.
while(1); // Prevent PIC from going to sleep
}
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carlosma
Joined: 24 Mar 2004
Posts: 53
Location: Portugal
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| Posted: Sat Jul 10, 2004 5:39 am |
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Thank you
I think that my problem is not in Software Port, because this port just used for read char incoming PC. It works fine when test.
From hardware Port (C6, C7, use "int_rda") Only wanted to read the "RING" or "OK" from Modem and compare with existing String, but never read any char or string.
The program:
| Code: |
#include <16F876.h>
#fuses HS,NOPROTECT,NOWDT,NOLVP,PUT,NOBROWNOUT
#use delay(clock=16000000)
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7, STREAM=COM_B) //hardware
#USE RS232(BAUD=9600, XMIT=PIN_B1, RCV=PIN_B0, STREAM=COM_A)
//...
#int_rda //read from COM_B modem GSM
void rda_isr()
{
char c;
c=fgetc(COM_B);
if ((c>=' ')&&(c<='~'))
{
buffer1[len] = c;
len++;
}
if(c==0x0A ||c==0x0D) // I gues End Of String
{
bit_com_b=1; // All OK
}
if(len >= BUFFER_SIZE)
{
//bit_set(ModemFlag,RecErr); // Something wrong !!
disable_interrupts(INT_RDA); // Get out & ovoid reentrance
len=0;
}
fputc(c, COM_A);//just for test arrive char
}
#int_ext //from com_A PC
void ext_isr()
{
cmd=fgetc(COM_A);
cmd=toupper(cmd);
fputc(cmd, COM_A);
}
void init_chip()
{
delay_ms(500);
//fprintf(COM_B, "AT+CSCA?\n");
delay_ms(1500);
fprintf(COM_B, "AT+CMGF=1\n");
muda_linha();
delay_ms(500);
fprintf(COM_B, "AT+CMGD=0,1\n");
muda_linha();
delay_ms(2000);
fprintf(COM_B, "AT+CNMI=1,1\n");
muda_linha();
delay_ms(500);
output_float(PIN_B0); // Set pin B0 as an input NEW
output_high(PIN_B1);//NEW
ext_int_edge( H_TO_L ); // Sets up EXT
setup_adc_ports(No_Analogs);
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_32);
enable_interrupts(int_timer0); // Enable timer0 interrupt
enable_interrupts(int_timer1);
setup_timer_1 (T1_INTERNAL);
set_timer1(65200);
enable_interrupts(int_ext);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
}
void main()
{
static boolean led2, led;
init_ext_eeprom();
init_chip();
while(1)
{
//..
// now, read and compare with String "RING" or "OK"
read_eeprom_string(s, ROM_ackmodem, ROM_askmodem_SIZE);
if (strncmp (buffer1, s, 5)==0)
{
fprintf(COM_A,"\r\nComutado\r\n");
disable_interrupts(INT_RDA);//disable interrupt port b
fprintf(COM_B,"AT+CMGR=1\n");
delay_us( 1000 );
enable_interrupts(INT_RDA);
len=0;
bit_com_b=0;
//..
if(cmd=='W')
{
//char string[ROM_SMTP_SIZE];
disable_interrupts(INT_EXT);
fprintf(COM_A, "\r\nSMTP: ");
get_string(string, ROM_SMTP_SIZE);
write_eeprom_string(string, ROM_SMTP, ROM_SMTP_SIZE);
}
}
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