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POpic 18F4550: local variable problem,
 

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  1. POpic 18F4550: local variable problem,
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    <p>I'm using the pic18F4550 with microchip v8.63 and with the C 18 compiler. I'm using a LDR that retrieve the value of the led (not on my picdem board) (red, green and blue) these values are stored in a variable after each conversion. Afther that when I press the button S2, I come into the method ISR: this part works.</p> <p>But now: I try to compare the variable red, green and blue in the if's: but I think that it not happen, he just go to my 'else' (led RB3 on my picdem board burns).</p> <pre><code>#include &lt;p18f4550.h&gt; /** V E C T O R R E M A P P I N G *******************************************/ extern void _startup (void); // See c018i.c in your C18 compiler dir #pragma code _RESET_INTERRUPT_VECTOR = 0x001000 void _reset (void) { _asm goto _startup _endasm } #pragma code void ISR (void); #pragma code _HIGH_INTERRUPT_VECTOR = 0x001008 void _high_ISR (void) { _asm goto ISR _endasm } #pragma code _LOW_INTERRUPT_VECTOR = 0x001018 void _low_ISR (void) { ; } #pragma code /******************************************************************************/ // global variable, value off LDR. unsigned int var1ADRESH = 0x00; unsigned int color_red = 0; unsigned int color_green = 0; unsigned int color_blue = 0; void main (void) { TRISD = 0x00; // PORTD als uitgang RCONbits.IPEN = 0; // prioriteit uit INTCONbits.GIE = 1; // enable interrupt INTCONbits.RBIE = 1; // interrupt portB aan //= set up port = TRISAbits.TRISA0 = 1; // Set RA0/AN0 to input //leds TRISAbits.TRISA3 = 0; TRISAbits.TRISA4 = 0; TRISAbits.TRISA5 = 0; LATAbits.LATA3 = 1; LATAbits.LATA4 = 1; LATAbits.LATA5 = 1; ADCON0 = 0b00000000; // Set channel select to AN0 ADCON1 = 0b00001110; // Configure RA0/AN0 as analogue ADCON2 = 0b10101010; // Right justified result // TAD 12 and FOSC 32 - may need to adjust this // depending on your clock frequency (see datasheet) while(1) { _asm sleep _endasm } } #pragma interrupt ISR void ISR (void) { if (INTCONbits.RBIF==1) { //conversie blauw LATAbits.LATA3 = 0; ADCON0bits.ADON = 1; // Enable ADC // read LDR value. ADCON0bits.GO = 1; // Set the GO bit of the ADCON0 register to start the conversion. while (ADCON0bits.GO); // Wait until the conversion is complete. ADCON2bits.ADFM = 0; // read result as 8-bit. (dus data in ADRESH) ! //= read data in ADRESH = var1ADRESH = ADRESH; // reading value from LDR color_blue = ADRESH; //waarde in blauw //conversie rood LATAbits.LATA3 = 1; LATAbits.LATA4 = 0; ADCON0bits.ADON = 1; // Enable ADC // read LDR value. ADCON0bits.GO = 1; // Set the GO bit of the ADCON0 register to start the conversion. while (ADCON0bits.GO); // Wait until the conversion is complete. ADCON2bits.ADFM = 0; // read result as 8-bit. (dus data in ADRESH) ! //= read data in ADRESH = var1ADRESH = ADRESH; // reading value from LDR color_red = ADRESH; //waarde in blauwe steken //conversie groen LATAbits.LATA4 = 1; LATAbits.LATA5 = 0; ADCON0bits.ADON = 1; // Enable ADC // read LDR value. ADCON0bits.GO = 1; // Set the GO bit of the ADCON0 register to start the conversion. while (ADCON0bits.GO); // Wait until the conversion is complete. ADCON2bits.ADFM = 0; // read result as 8-bit. (dus data in ADRESH) ! //= read data in ADRESH = var1ADRESH = ADRESH; // reading value from LDR color_green = ADRESH; //waarde in blauwe steken // alles uitzetten //PORTB = 0b1111111; LATAbits.LATA5 = 1; if(color_blue &gt; color_red &amp;&amp; color_blue &gt; color_green){ //blauw LATDbits.LATD0 = 1; } if(color_red &gt; color_blue &amp;&amp; color_red &gt; color_green){ //rood LATDbits.LATD1 = 1; } if(color_green &gt; color_red &amp;&amp; color_green &gt; color_blue){ //groen LATDbits.LATD2 = 1; } else { LATDbits.LATD3 = 1; } } INTCONbits.RBIF = 0; } </code></pre>
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    1. USprojecten1
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      1. VTUpMod
    1. COHow about asking this the folks at http://electronics.stackexchange.com/ ?
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      1. POpic 18F4550: local variable problem,
      1. USPeter G.
    2. COtry changing those if statements to if (color_blue == 0) then set the LATD0,1,2 to see if they are even getting values set.
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      1. POpic 18F4550: local variable problem,
      1. USThePosey
 

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