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Interrupt ext_int_edge triggers backwards CCS Forum Index -> General CCS C Discussion View previous topic :: View next topic Author Jacky Guest

Message Interrupt ext_int_edge triggers backwards Posted: Mon Jan 15, 2007 3:40 pm

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

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27.2.2007 г. 09:37

CCS :: View topic - Interrupt ext_int_edge triggers backwards

http://ccsinfo.com/forum/viewtopic.php?t=29493&highlight=int0...

#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); } PCM programmer

Joined: 06 Sep 2003 Posts: 6760

Posted: Mon Jan 15, 2007 4:04 pm

Quote: ext_int_edge(INT_EXT, H_TO_L);

The first parameter is incorrect. See the manual. http://www.ccsinfo.com/downloads.php

Jacky Guest

Posted: Mon Jan 15, 2007 6:08 pm

thanks, changed to: Code: ext_int_edge(0,H_TO_L);

and all works well now. Thanks Display posts from previous: All Posts

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