16F684 adcin and hpwm

[anonymouse]

Got it working. Heres the code:

DEFINE FOSC 100
DEFINE ADC_BITS 10 ' Set number of bits in result
DEFINE ADC_CLOCK 3 ' Set clock source (3=rc)
DEFINE ADC_SAMPLEUS 50 ' Set sampling time in uS
OSCCON = %01100001 '4 Mhz

TRISA = %11111111 ' Set PORTA to all input
ADCON1 = %10000010 ' Set PORTA analog and right justify
output portc.5

adcVar VAR word
dutyCycle var byte


main:
ADCIN 0, adcVar
dutyCycle = adcVar/256
hpwm 1,dutyCycle,6000
goto main

word filled by 10bit, result divided by 256?

[astouffer]

word filled by 10bit, result divided by 256?

Would it make more sense to sample 8 bits? Without dividing by 256 one full turn of the pot repeats 0-100% duty cycle many times. I admit being new to the world of programming and working with the internals of microprocessors.

[mister_e]

Well yes and no. Yes if you're using HPWM, no if you set the CCP register yourself as in the ASM code.

One thing is sure, 10 bits/256, will not give you a 8 bit results... if you divide it by 4... yes.