Intrerupere externa pic 18f2550

[Vizitator mitumunteanu]

Tot incerc sa fac o intrerupere externa pe pinul RB0/INT0.

Am setat flagurile GIE si INT0IE din registrul INTCON si pinul RB0 l-am declarat ca intrare.

Am rulat programul cu un debugger si cand pun pinul RB0 la 5V, in PORTB bitul 0 se pune pe 1(ceea ce e si normal) insa flagul INT0IF din INTCON nu se seteaza.

Daca poate sa ma ajute cineva cu aceasta problema ar fi super.

[costi002]

Poate mai trebuie setat și ceva pe la întreruperile periferice, gen PIE. 

[mars01]

Eu zic sa postezi codul asa cum nu iti merge. Pe marginea lui se poate vedea ce se greseste, asa din vorbe ne dam cu parerea ...

 

LE: In datasheet scrie:

"For external interrupt events, such as the INT pins or the PORTB input change interrupt, the interrupt latency will be three to four instruction cycles. The exact latency is the same for one or two-cycle instructions. Individual interrupt flag bits are set regardless of the status of their corresponding enable bit or the GIE bit."

 

Adu-ti aminte sa faci un clear la interrupt flag-ul tau in initializare.

 

LLE: pe ce front este setata intreruperea? Pe tranzitie LOW- HI sau HI-LOW? Tu faci tranzitie LOW-HI din cate inteleg ... Bit 6 in INTCON2. Default este pe falling edge adica pe HI to LOW.

Editat Decembrie 28, 2015 de mars01

[Vizitator mitumunteanu]

Codul este scris in assambler:

 

           #INCLUDE P18F2550.INC

 

           ORG 0000H

           GOTO start

 

           ORG 0008H

           BCF INTCON,1

           RETFIE

 

start:  MOVLW 0x01

           MOVWF TRISB

           MOVLW 0x90

           MOVWF INTCON

           BSF INTCON2,6

           GOTO $

           end;  

 

Dupa cum vezi am initializat flagul INT0IF cu 0, iar intreruperea e activa pe frontul crescator, insa tot nu merge

Editat Decembrie 28, 2015 de mitumunteanu

[mars01]

Nu sunt foarte familiar cu assembler-ul dar din cate stiu ordinea setarii bitilor intreruperii este importanta.

 

1. faci set la bitul 6 din INTCON2.

2. faci clear la bitul 1 din INTCON (adica INTCONbits.INT0IF = 0)

3. muti 0x90 in INTCON (adica INTCONbits.GIE= 1, INTCONbits.INT0IE = 1)

 

Oricum, indiferent daca sunt sau nu sunt activate intreruperile ar trebui sa vezi INTCONbits.INT0IE ca trece din 0 in 1 atunci cand se schimba starea bitului 0 din portul B.

 

Dupa ce intreruperea a fost activata se face clear la INTCONbits.INT0IF din rutina ISR.

 

Am citit candva ca trebuie facuta o citire a portului inainte (era vorba de modul SLEEP si de IoC dar cine stie, poate merge si la tine).

Editat Decembrie 28, 2015 de mars01

[costi002]

Încearcă și cu PEIE =1, nu ai nimic de pierdut. 

[mars01]

Nu stiu ce problema ai tu dar poate te ajuta urmatoarele.

Am facut in XC8 un mic program pentru testare.

Cu intreruperea externa INT0 activa, cand bitul B0 al PORTB trece din Low in High se face un toggle la iesirea PORTC bit0.

Totul merge foarte bine.

 

Codul este:

#include <xc.h>#include <stdint.h>// #pragma config statements should precede project file includes.// Use project enums instead of #define for ON and OFF.// CONFIG1L#pragma config PLLDIV = 1       // PLL Prescaler Selection bits (No prescale (4 MHz oscillator input drives PLL directly))#pragma config CPUDIV = OSC1_PLL2// System Clock Postscaler Selection bits ([Primary Oscillator Src: /1][96 MHz PLL Src: /2])#pragma config USBDIV = 1       // USB Clock Selection bit (used in Full-Speed USB mode only; UCFG:FSEN = 1) (USB clock source comes directly from the primary oscillator block with no postscale)// CONFIG1H#pragma config FOSC = INTOSC_HS // Oscillator Selection bits (Internal oscillator, HS oscillator used by USB (INTHS))#pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)#pragma config IESO = OFF       // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)// CONFIG2L#pragma config PWRT = OFF       // Power-up Timer Enable bit (PWRT disabled)#pragma config BOR = OFF        // Brown-out Reset Enable bits (Brown-out Reset disabled in hardware and software)#pragma config BORV = 3         // Brown-out Reset Voltage bits (Minimum setting 2.05V)#pragma config VREGEN = OFF     // USB Voltage Regulator Enable bit (USB voltage regulator disabled)// CONFIG2H#pragma config WDT = OFF        // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))#pragma config WDTPS = 32768    // Watchdog Timer Postscale Select bits (1:32768)// CONFIG3H#pragma config CCP2MX = ON      // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)#pragma config PBADEN = OFF     // PORTB A/D Enable bit (PORTB<4:0> pins are configured as digital I/O on Reset)#pragma config LPT1OSC = OFF    // Low-Power Timer 1 Oscillator Enable bit (Timer1 configured for higher power operation)#pragma config MCLRE = OFF      // MCLR Pin Enable bit (RE3 input pin enabled; MCLR pin disabled)// CONFIG4L#pragma config STVREN = ON      // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)#pragma config LVP = OFF        // Single-Supply ICSP Enable bit (Single-Supply ICSP disabled)#pragma config XINST = OFF      // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))// CONFIG5L#pragma config CP0 = OFF        // Code Protection bit (Block 0 (000800-001FFFh) is not code-protected)#pragma config CP1 = OFF        // Code Protection bit (Block 1 (002000-003FFFh) is not code-protected)#pragma config CP2 = OFF        // Code Protection bit (Block 2 (004000-005FFFh) is not code-protected)#pragma config CP3 = OFF        // Code Protection bit (Block 3 (006000-007FFFh) is not code-protected)// CONFIG5H#pragma config CPB = OFF        // Boot Block Code Protection bit (Boot block (000000-0007FFh) is not code-protected)#pragma config CPD = OFF        // Data EEPROM Code Protection bit (Data EEPROM is not code-protected)// CONFIG6L#pragma config WRT0 = OFF       // Write Protection bit (Block 0 (000800-001FFFh) is not write-protected)#pragma config WRT1 = OFF       // Write Protection bit (Block 1 (002000-003FFFh) is not write-protected)#pragma config WRT2 = OFF       // Write Protection bit (Block 2 (004000-005FFFh) is not write-protected)#pragma config WRT3 = OFF       // Write Protection bit (Block 3 (006000-007FFFh) is not write-protected)// CONFIG6H#pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) are not write-protected)#pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot block (000000-0007FFh) is not write-protected)#pragma config WRTD = OFF       // Data EEPROM Write Protection bit (Data EEPROM is not write-protected)// CONFIG7L#pragma config EBTR0 = OFF      // Table Read Protection bit (Block 0 (000800-001FFFh) is not protected from table reads executed in other blocks)#pragma config EBTR1 = OFF      // Table Read Protection bit (Block 1 (002000-003FFFh) is not protected from table reads executed in other blocks)#pragma config EBTR2 = OFF      // Table Read Protection bit (Block 2 (004000-005FFFh) is not protected from table reads executed in other blocks)#pragma config EBTR3 = OFF      // Table Read Protection bit (Block 3 (006000-007FFFh) is not protected from table reads executed in other blocks)// CONFIG7H#pragma config EBTRB = OFF      // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) is not protected from table reads executed in other blocks)void __interrupt ISR();void SYS_init();void __interrupt ISR() {    if (INTCONbits.INT0IF && INTCONbits.INT0IE) {        INTCONbits.INT0IF = 0;        LATCbits.LATC0 = !LATCbits.LATC0;    }}void SYS_init() {    OSCCON = 0x77;    TRISBbits.RB0 = 1;    LATCbits.LATC0 = 0;    TRISCbits.RC0 = 0;         INTCONbits.INT0IF = 0;    INTCON2bits.INTEDG0 = 1;    INTCONbits.INT0IE = 1;    INTCONbits.GIE = 1;  }void main(void) {    SYS_init();        while (1){            } }

In asamblare este asa:

 #include <xc.h>10:            #include <stdint.h>11:            12:            // #pragma config statements should precede project file includes.13:            // Use project enums instead of #define for ON and OFF.14:            15:            // CONFIG1L16:            #pragma config PLLDIV = 1       // PLL Prescaler Selection bits (No prescale (4 MHz oscillator input drives PLL directly))17:            #pragma config CPUDIV = OSC1_PLL2// System Clock Postscaler Selection bits ([Primary Oscillator Src: /1][96 MHz PLL Src: /2])18:            #pragma config USBDIV = 1       // USB Clock Selection bit (used in Full-Speed USB mode only; UCFG:FSEN = 1) (USB clock source comes directly from the primary oscillator block with no postscale)19:            20:            // CONFIG1H21:            #pragma config FOSC = INTOSC_HS // Oscillator Selection bits (Internal oscillator, HS oscillator used by USB (INTHS))22:            #pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)23:            #pragma config IESO = OFF       // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)24:            25:            // CONFIG2L26:            #pragma config PWRT = OFF       // Power-up Timer Enable bit (PWRT disabled)27:            #pragma config BOR = OFF        // Brown-out Reset Enable bits (Brown-out Reset disabled in hardware and software)28:            #pragma config BORV = 3         // Brown-out Reset Voltage bits (Minimum setting 2.05V)29:            #pragma config VREGEN = OFF     // USB Voltage Regulator Enable bit (USB voltage regulator disabled)30:            31:            // CONFIG2H32:            #pragma config WDT = OFF        // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))33:            #pragma config WDTPS = 32768    // Watchdog Timer Postscale Select bits (1:32768)34:            35:            // CONFIG3H36:            #pragma config CCP2MX = ON      // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)37:            #pragma config PBADEN = OFF     // PORTB A/D Enable bit (PORTB<4:0> pins are configured as digital I/O on Reset)38:            #pragma config LPT1OSC = OFF    // Low-Power Timer 1 Oscillator Enable bit (Timer1 configured for higher power operation)39:            #pragma config MCLRE = OFF      // MCLR Pin Enable bit (RE3 input pin enabled; MCLR pin disabled)40:            41:            // CONFIG4L42:            #pragma config STVREN = ON      // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)43:            #pragma config LVP = OFF        // Single-Supply ICSP Enable bit (Single-Supply ICSP disabled)44:            #pragma config XINST = OFF      // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))45:            46:            // CONFIG5L47:            #pragma config CP0 = OFF        // Code Protection bit (Block 0 (000800-001FFFh) is not code-protected)48:            #pragma config CP1 = OFF        // Code Protection bit (Block 1 (002000-003FFFh) is not code-protected)49:            #pragma config CP2 = OFF        // Code Protection bit (Block 2 (004000-005FFFh) is not code-protected)50:            #pragma config CP3 = OFF        // Code Protection bit (Block 3 (006000-007FFFh) is not code-protected)51:            52:            // CONFIG5H53:            #pragma config CPB = OFF        // Boot Block Code Protection bit (Boot block (000000-0007FFh) is not code-protected)54:            #pragma config CPD = OFF        // Data EEPROM Code Protection bit (Data EEPROM is not code-protected)55:            56:            // CONFIG6L57:            #pragma config WRT0 = OFF       // Write Protection bit (Block 0 (000800-001FFFh) is not write-protected)58:            #pragma config WRT1 = OFF       // Write Protection bit (Block 1 (002000-003FFFh) is not write-protected)59:            #pragma config WRT2 = OFF       // Write Protection bit (Block 2 (004000-005FFFh) is not write-protected)60:            #pragma config WRT3 = OFF       // Write Protection bit (Block 3 (006000-007FFFh) is not write-protected)61:            62:            // CONFIG6H63:            #pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) are not write-protected)64:            #pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot block (000000-0007FFh) is not write-protected)65:            #pragma config WRTD = OFF       // Data EEPROM Write Protection bit (Data EEPROM is not write-protected)66:            67:            // CONFIG7L68:            #pragma config EBTR0 = OFF      // Table Read Protection bit (Block 0 (000800-001FFFh) is not protected from table reads executed in other blocks)69:            #pragma config EBTR1 = OFF      // Table Read Protection bit (Block 1 (002000-003FFFh) is not protected from table reads executed in other blocks)70:            #pragma config EBTR2 = OFF      // Table Read Protection bit (Block 2 (004000-005FFFh) is not protected from table reads executed in other blocks)71:            #pragma config EBTR3 = OFF      // Table Read Protection bit (Block 3 (006000-007FFFh) is not protected from table reads executed in other blocks)72:            73:            // CONFIG7H74:            #pragma config EBTRB = OFF      // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) is not protected from table reads executed in other blocks)75:            76:            void __interrupt ISR();77:            void SYS_init();78:            79:            void __interrupt ISR() {0008  8202     BSF 0x2, 1, ACCESS0012  0006     POP80:                if (INTCONbits.INT0IF && INTCONbits.INT0IE) {0014  B2F2     BTFSC INTCON, 1, ACCESS0016  A8F2     BTFSS INTCON, 4, ACCESS0018  D00C     BRA 0x3281:                    INTCONbits.INT0IF = 0;001A  92F2     BCF INTCON, 1, ACCESS82:                    LATCbits.LATC0 = !LATCbits.LATC0;001C  B08B     BTFSC LATC, 0, ACCESS001E  D003     BRA 0x260020  6A01     CLRF 0x1, ACCESS0022  2A01     INCF 0x1, F, ACCESS0024  D001     BRA 0x280026  6A01     CLRF 0x1, ACCESS0028  508B     MOVF LATC, W, ACCESS002A  1801     XORWF 0x1, W, ACCESS002C  0BFE     ANDLW 0xFE002E  1801     XORWF 0x1, W, ACCESS0030  6E8B     MOVWF LATC, ACCESS83:                }84:            }0032  9202     BCF 0x2, 1, ACCESS85:            86:            void SYS_init() {87:                OSCCON = 0x77;0036  0E77     MOVLW 0x770038  6ED3     MOVWF OSCCON, ACCESS88:                TRISBbits.RB0 = 1;003A  8093     BSF TRISB, 0, ACCESS89:                LATCbits.LATC0 = 0;003C  908B     BCF LATC, 0, ACCESS90:                TRISCbits.RC0 = 0; 003E  9094     BCF TRISC, 0, ACCESS91:                92:                INTCONbits.INT0IF = 0;0040  92F2     BCF INTCON, 1, ACCESS93:                INTCON2bits.INTEDG0 = 1;0042  8CF1     BSF INTCON2, 6, ACCESS94:                INTCONbits.INT0IE = 1;0044  88F2     BSF INTCON, 4, ACCESS95:                INTCONbits.GIE = 1;  0046  8EF2     BSF INTCON, 7, ACCESS96:            }0008  8202     BSF 0x2, 1, ACCESS000A  ED09     CALL 0x12, 1000C  F000     NOP000E  EF25     GOTO 0x4A0010  F000     NOP0048  0C77     RETLW 0x7797:            void main(void) {98:                SYS_init();0054  EC1B     CALL 0x36, 00056  F000     NOP99:                100:               while (1){101:                   102:               } 0058  D7FF     BRA 0x58103:           }

Ai atasata simularea in Proteus 8.3.

INT0_interrupt.zip

Editat Decembrie 28, 2015 de mars01

[Vizitator mitumunteanu]

Am incercat tot ce mi-ati zis: am schimbat oridinea in care configurez bitii, am pus si PEIE pe 1 insa tot nu se seteaza INT0IF cand RB0 trece din 0 in 1. 

Se poate ca problema sa fie din cauza bitilor de configurare ai controllerului?

Editat Decembrie 29, 2015 de mitumunteanu

[Liviu M]

Foloseste un pin pe post de debugger - pune un led pe el si fa-l sa se aprinda si sa se stinga cu o frecventa care sa-ti permita sa-l "vezi". In felul asta te asiguri ca picul e configurat cum trebuie.

[mars01]

Ce a spus Liviu trebuie incercat. Este "Hello World" pentru controlere.

 

Mai merita verificat si cu alt controler. Poate este o problema hardware.

 

O chestie ar mai fi ca atunci cand am facut programul de mai sus in XC8 am primit doua atentionari cum ca tine cont de nu stiu ce errata atunci cand genereaza codul.

S-ar putea sa te lovesti fix de acest lucru.

 

LE: In erata lui 18F2550 se face referire la ceva probleme cu modulul de intreruperi. Nu am stat sa citesc in detaliu (este o erata destul de mare chiar si pentru Microchip) dar iti recomand sa o faci.

Editat Decembrie 29, 2015 de mars01

[Vizitator mitumunteanu]

Si pentru celelalte linii de intrerupere (INT1 si INT2) am acceasi problema. Flagurile INTxIF nu se seteaza pe front. 

[mars01]

Acesta este mesajul la compilare:

Copyright © 2015 Microchip Technology Inc.

License type: Node Configuration

 

:: advisory: (1233) Employing 18F2550 errata work-arounds:

:: advisory: (1234)  * Corrupted fast interrupt shadow registers

 

 Foloseste-te de codul din postul 7.

 

Uite si fisierul .HEX pentru programul scris mai sus. Programeaza-l in PIC si daca functioneaza (la apasarea lui PORTB0 se schimba starea pe PORTC1 (toggle)) atunci probabil ca mai trebuie studiu.

 

test_intrerupere_INT0.X.production.zip

Editat Decembrie 29, 2015 de mars01

[sosoi]

Nu trebuie initializat pinul ca intrare digitala?

Vad ca pe RB0 e AN12 ... cred ca ar trebui adaugate si liniile :

MOVLW 0x03MOVWF ADCON1

Editat Decembrie 30, 2015 de sosoi

[Vizitator mitumunteanu]

   @mars01:

            Am programat hex -ul dat de tine si merge, chestia ca nu vad ca tu sa fi facut ceva special in cod.

 

Cat despre initializarea pinilor ca intrari digitale am facut si asta si tot se seteaza flagul ala obosit.

[Liviu M]

Se poate ca problema sa fie din cauza bitilor de configurare ai controllerului?

Probabil. Altfel de unde sa stie PIC-ul, de exemplu, ce fel de oscilator folosesti? Ca sa verifici ca-l configurezi bine iti sugerasem testul cu LED-ul.