sbi DDRB, 5 //led output
cbi DDRC, 0 //LDR input
sbi PORTC, 0 //pull up resistor
//---- Conversion starts here ----//
LDI R16 , 0x87
STS ADCSRA, R16
LDI R16 , 0x11
STS ADMUX, R16
//configurations done
READ_ADC:
//CBI PORTB,5
LDS R18, ADCSRA
SBR R18,0b01000000
STS ADCSRA,R18
KEEP_POLING :
LDS R19, ADCSRA
SBRS R19, 4
//
RJMP KEEP_POLING // loop bc conversion not complegted ADIGF =0+
LDS R16, ADCSRA
SBR R16,0b00010000
STS ADCSRA,R16
// above is setting bit 4 to 1 indicating that conversion over
//below is reading the high and low byte of the ADC
LDS R16,ADCL //8 bits
LDS R17,ADCH // read 2 bits
LDI R20, 0Xf4
CP R16,R20 //IF R16>=R20
BRGE greateq // The low bits are greater than 244 so if ADCH has a value of one which is 2^8=256+244=500
CP R20,R16 //IF R20> R16 (It's dim)
BRGE check
greateq:
LDI R21,0X01 //Here we are checking if it is greater than or equal to one (2^8 on or more)
CP R17,R21
brge light
CP R21, R17
brge dim
check: // The ADCL has a decimal value lower than 244 so we need either 2^9 or both 2^8 and 2^9 but ( 2^8 alone is not enough )
LDI R23,0x02 // Greater than or equal to 2 aka either (2^9 is on) or (2^8 and 2^9 together are on)
CP R17,R23
brge light
CP R23, R17
brge dim
light:
CBI PORTB, 5 // Turns off the LED
dim:
SBI PORTB, 5 // Turns on the LED
RJMP READ_ADC
问题是LED一直亮着。 该代码应继续检查光强度是否超过500，并且如果这样做，则应清除与LED连接的位，但是如果光强度大于500，则应将该位设置为1。点亮LED。 是什么弄乱了我代码中的值？