我将 pic18F4550 与 microchip v8.63 和 C 18 编译器一起使用。我正在使用一个 LDR 来检索 LED 的值（不在我的 picdem 板上）（红色、绿色和蓝色），这些值在每次转换后都存储在一个变量中。之后，当我按下按钮 S2 时，我进入了 ISR 方法：这部分有效。
但是现在：我尝试比较 if 中的变量 red、green 和 blue：但我认为这不会发生，他只是去我的“else”（我的 picdem 板上的 LED RB3 烧毁）。
#include <p18f4550.h>
/** 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 > color_red && color_blue > color_green){
//blauw
LATDbits.LATD0 = 1;
}
if(color_red > color_blue && color_red > color_green){
//rood
LATDbits.LATD1 = 1;
}
if(color_green > color_red && color_green > color_blue){
//groen
LATDbits.LATD2 = 1;
}
else {
LATDbits.LATD3 = 1;
}
}
INTCONbits.RBIF = 0;
}