ADCIN does not work with AN16

[Alexey]

Hello All,

Is there any limitation in analog input #? I have ADCIN working OK with AN15 but it does not work with AN16.

Defines are standard:

DEFINE ADC_BITS 10 'Set number of bits in result
DEFINE ADC_SAMPLEUS 50 'Set sampling time in uS
DEFINE ADC_CLOCK 3

adcin 16 , READING returns a value around near 14000 (READING is word) which is strange for 10 bit conversion...

I use microcontroller PIC18F25k22

adcin 15 works OK

Can someone comment please?

Thank you

[aerostar]

Anselc correctly set ?

[Alexey]

Yes,

ANSELC = %11000 'C.3, C.4 analog

C.3 and C.4 are AN15 and AN16

I suspect that unless there is my mistake somewhere, input # may be a byte variable in PBP3

I did the reading manually:


ADCON2 = %10000000 '111 'LEFT JUSTIFIED(0),not used,...
ADCON0 = %1000001 'AN16 USED 10000, NO GO NOW,STAY ON
ADCON1 = %1000 'VOLTAGE REFFERENCES
VREFCON0 = %10010000 'ENABLED, SET FOR 1.024 VOLT
RefNotReady:
IF VREFCON0.6 = 0 THEN GOTO RefNotReady

PAUSEUS 50
ADCON0 = %1000011 'GO NOW

ADCNotComplete:
IF ADCON0.1 = 1 THEN GOTO ADCNotComplete

AMB_TEMP.BYTE1 = ADRESH
AMB_TEMP.BYTE0 = ADRESL

VREFCON0 = 0 'DISABLE REFERENCE
ADCON1 = 0
ADCON0 = 0 'CONVERTER OFF, NO CURRENT

This seems to be working well

[Charlie]

Which version of PBP are you using? The manual does not mention any limit to the number of addresses, but it is suspicious that 0-15 work and 16 and up do not...

[Alexey]

It is PBP3 3.0.7.4, must be the most recent. Actually I did not try higher #s than 16.