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Bart
Joined: 12 Jul 2005
Posts: 49
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| Working on 16F877, not on 18F4550. Why ? |
 Posted: Tue Oct 11, 2005 2:55 pm |
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Hello,
Can't find why the below code won't work on me 18F. It worked fine on a 16F877.
I made some changes in my hardware (and also my code) between 16F and 18F :
* use of INT2 i.p.o. INT
* RS232 on other pins (but it is working fine, I get the version info in the Hyperterminal)
* other LCD driver (but it is working fine, I get the version info on the LCD)
It seems that I don't get the char's with the fgetc(GPS). But the char's seems to be there (on the pin) becase I receive interrupts (checked by printing - - - - - in the Hyperterminal via the fprintf(MODEM," - %S",c)
Someone an idee ?
Thanks.
| Code: |
// VERSION : 0.1.03
// * blinking blue led
// * RS232 (E0 E1) : GPS stream to PC
// * RS232 (B2 B3) : GPS stream to PIC
// * LCD 4x20 : version displaying on LCD
#include <18F4550.h>
#fuses HS,NOWDT,NOPUT,NOLVP,NOBROWNOUT,NOCPD,NOWRT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_E1, rcv=PIN_E0, stream=MODEM)
#use rs232(baud=4800, xmit=PIN_B1, rcv=PIN_B0, stream=GPS)
#include <LCD4x20D.C>
#define GPS_BUFFER_SIZE 70
static char GPS_buffer[GPS_BUFFER_SIZE];
static char GPS_code[] = "$GPRMC";
static char* GPS_p = GPS_buffer;
static int GPS_state = 0;
static short GPS_done = TRUE;
static short GPS_found = FALSE;
#int_ext2
void GPS_isr()
{
char c;
c = fgetc(GPS);
fprintf(MODEM," - %S",c);
if( GPS_found == FALSE )
{
GPS_found = TRUE;
}
if( GPS_state < 6 )
{
if( c == GPS_code[GPS_state] )
{
if( GPS_state == 0 )
{
GPS_p = GPS_buffer;
}
*GPS_p = c;
GPS_p++;
GPS_state++;
}
else
{
GPS_state = 0;
}
}
else
{
if( c == 0x0d ) // carriage return
{
*GPS_p = 0;
GPS_done = TRUE;
disable_interrupts(INT_EXT2);
}
else
{
*GPS_p = c;
GPS_p++;
GPS_state++;
}
}
}
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(VREF_LOW|-2);
setup_low_volt_detect(FALSE);
setup_oscillator(False);
// Version output to RS232 PC Hyperterminal (stream MODEM)
fprintf(MODEM,"\033[2J"); // clear screen
fprintf(MODEM," PIC Online\n\r");
fprintf(MODEM," Version : 0.1.03\n\r");
fprintf(MODEM," Copyright 2005 Bart De Pauw\n\r");
fprintf(MODEM," For PIC 18F4550\n\r");
fprintf(MODEM," GPS stream to PC\n\r");
// Version output to LCD
lcd_init();
lcd_putc("\f**** PIC Online ****\n");
lcd_putc("Copyright 2005 \n");
lcd_putc("V0.1.03 Bart De Pauw\n");
lcd_putc("* GPS stream to PC *\n");
// 12345678901234567890 (Help for alligning messages on LCD)
// GPS tx is connected to pin RB2 (pin 35) so INT2
ext_int_edge(2,H_TO_L);
enable_interrupts(INT_EXT2);
enable_interrupts(GLOBAL);
while (TRUE)
{
if( GPS_found && GPS_done )
{
fputs(GPS_buffer,MODEM);
GPS_state = 0;
GPS_done = FALSE;
output_HIGH(PIN_A0);
delay_ms(100);
output_LOW(PIN_A0);
enable_interrupts(INT_EXT2);
}
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Oct 11, 2005 7:24 pm |
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| Quote: | VERSION : 0.1.03
// * blinking blue led
// * RS232 (E0 E1) : GPS stream to PC
// * RS232 (B2 B3) : GPS stream to PIC
// * LCD 4x20 : version displaying on LCD
#use rs232(baud=4800, xmit=PIN_B1, rcv=PIN_B0, stream=GPS) |
The pins in the comments don't match the #use rs232() statement.
Is the GPS connected to pins B2 and B3, or pins B1 and B0 ?
If that's not the problem, then post your compiler version. |
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