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Jacky
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| Interrupt ext_int_edge triggers backwards |
 Posted: Mon Jan 15, 2007 3:40 pm |
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I'm trying to read one of my robot sensors as an interrupt, it works as a software loop but the interrupt is backwards.
Condition: The robot is on a black surface PIN_RB0 HIGH, will turn low on a white surface.
This works:
| Code: | if( !INPUT(LINE_L_DET2) ) {
printf("\n\rLine Left Detect");
} |
I tried to turn the above loop into an interrupt but I only get the interrupt when: Robot enters the white surface, Robot goes back to black surface = INTERRUPT
I tried switching ext_int_edge(INT_EXT,H_TO_L); but it will not change the outcome. I need the interrupt when the robot goes from black onto the white surface not the other way around.
Example Program, the Sensor is connected to RB0(INT_EXT):
| Code: |
#include <18F2620.h>
#device adc=10
#FUSES NOWDT //No Watch Dog Timer
//#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
//#FUSES HS //External HighSpeed Clock
#FUSES NOPROTECT //Code not protected from reading
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES NOBROWNOUT //No brownout reset
//#FUSES BORV21 //Brownout reset at 2.1V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES NOSTVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES NOPBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES NOLPT1OSC //Timer1 configured for low-power operation
#FUSES NOMCLR //Master Clear pin enabled
#use delay(clock=8000000)
#use rs232(baud=115200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PC)
#use fast_io(b)
#use fast_io(c)
//Left Side of Sensor Array
#define LINE_L_DET1 PIN_B2 //IR Detector on Inside
#define LINE_L_DET2 PIN_B0 //IR Detector on Outside
#define LINE_L_EM PIN_B5 //Power for IR Emitter
#define LINE_L_DET PIN_B4 //Power On For IR Detector
#int_ext
void rb0__isr() {
disable_interrupts(INT_EXT);
printf("\r\n\r\nInterrupt\r\n");
}
void main()
{
setup_oscillator(OSC_8MHZ);
set_tris_a(0b00000001 );
set_tris_b(0b00001111 );
set_tris_c(0b00000000 );
setup_adc(ADC_OFF);
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);
//Turn Off All IR Emitters
output_low(LINE_L_EM);
//All IR Emitters Off
ext_int_edge(INT_EXT,H_TO_L); // interrupt when robot enters the white border around the arena
enable_interrupts(global); //Enable Interrupts
enable_interrupts(INT_EXT); //Enable Interrupt in INT0
do {
output_high(LINE_L_DET); //Turn on Power to IR Detectors
output_high(LINE_L_EM); //Turn on Power to IR Emitters (they are always on to use interrupts)
enable_interrupts(INT_EXT);
} while (TRUE);
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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Jacky
Guest
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| Posted: Mon Jan 15, 2007 6:08 pm |
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thanks, changed to:
| Code: | | ext_int_edge(0,H_TO_L); |
and all works well now. Thanks |
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