1 Attachment(s)
How do you chose ADCIN channel in this case
PIC 16F18877 at 32MHz with FOSC/128 (as per table 23-1 on p. 331) and right-justified results.
I'd like to use E0:
Attachment 9766
HPWM backlight to LCD does work, I see it briefly on start-up using default value.
Code:
#CONFIG
__config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
__config _CONFIG2, _MCLRE_ON & _PWRTE_OFF & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
__config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_OFF & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
__config _CONFIG4, _WRT_OFF & _SCANE_available & _LVP_OFF
__config _CONFIG5, _CP_OFF & _CPD_OFF
#ENDCONFIG
DEFINE OSC 32
DEFINE ADC_BITS 10 ' 10-bit Analog to digital
DEFINE LCD_DREG PORTD ' Set LCD data port
DEFINE LCD_DBIT 4 ' Set starting data bit
DEFINE LCD_RSREG PORTB ' Set LCD register select port
DEFINE LCD_RSBIT 4 ' Set LCD register select bit
DEFINE LCD_EREG PORTB ' Set LCD enable port
DEFINE LCD_EBIT 0 ' Set LCD enable bit
DEFINE LCD_BITS 4 ' Set LCD bus size
DEFINE LCD_LINES 4 ' Set number of lines on LCD
DEFINE LCD_COMMANDUS 1000 ' Set command delay time in microseconds
DEFINE LCD_DATAUS 50 ' Set data delay time in microseconds
define CCP1_REG 0 ' Must clear unused CCP pins or else unpredictable results
DEFINE CCP1_BIT 0
define CCP2_REG 0
DEFINE CCP2_BIT 0
define CCP3_REG PORTD ' PWM Pulse out to LCD backlight
DEFINE CCP3_BIT 1
define CCP4_REG 0 ' Must clear unused CCP pins or else unpredictable results
DEFINE CCP4_BIT 0
define CCP5_REG 0
DEFINE CCP5_BIT 0
RB5PPS = 0 ' Disable CCP3
ADCON0 = %10000100 ' ADC CONTROL REGISTER 0
' bit 7 ADON: ADC Enable bit
' ---> 1 = ADC is enabled
' 0 = ADC is disabled
' bit 6 ADCONT: ADC Continuous Operation Enable bit
' 1 = ADGO is retriggered upon completion of each conversion trigger until ADTIF is set (if ADSOI is
' set) or until ADGO is cleared (regardless of the value of ADSOI)
' 0 = ADGO is cleared upon completion of each conversion trigger
' bit 5 Unimplemented: Read as ‘0’
' bit 4 ADCS: ADC Clock Selection bit
' 1 = Clock supplied from FRC dedicated oscillator
' 0 = Clock supplied by FOSC, divided according to ADCLK register
' bit 3 Unimplemented: Read as ‘0’
' bit 2 ADFRM0: ADC results Format/alignment Selection
' ---> 1 = ADRES and ADPREV data are right-justified
' 0 = ADRES and ADPREV data are left-justified, zero-filled
' bit 1 Unimplemented: Read as ‘0’
' bit 0 ADGO: ADC Conversion Status bit
' 1 = ADC conversion cycle in progress. Setting this bit starts an ADC conversion cycle. The bit is
' cleared by hardware as determined by the ADCONT bit
' 0 = ADC conversion completed/not in progress
ADCLK = %00111111 ' ADC CLOCK SELECTION REGISTER
' bit 7-6 Unimplemented: Read as ‘0’
' bit 5-0 ADCCS<5:0>: ADC Conversion Clock Select bits
' ---> 111111 = FOSC/128
' 111110 = FOSC/126
' 111101 = FOSC/124
' •
' 000000 = FOSC/2
ADPCH = %00100000 ' ADC POSITIVE CHANNEL SELECTION REGISTER
' bit 7-6 Unimplemented: Read as ‘0’
' bit 5-0 ADPCH<5:0>: ADC Positive Input Channel Selection bits
' 111111 = Fixed Voltage Reference (FVR)
' 111110 = DAC1 output
' 111101 = Temperature Indicator
' 111100 = AVSS (Analog Ground)
' 111011 = Reserved. No channel connected.
' •
' •
' •
' 100010 = ANE2 * 16F18877 only
' 100001 = ANE1 * 16F18877 only
' ---> 100000 = ANE0 * 16F18877 only
' 011111 = AND7 * 16F18877 only
' 011110 = AND6 * 16F18877 only
' 011101 = AND5 * 16F18877 only
' 011100 = AND4 * 16F18877 only
' 011011 = AND3 * 16F18877 only
' 011010 = AND2 * 16F18877 only
' 011001 = AND1 * 16F18877 only
' 011000 = AND0 * 16F18877 only
' 010111 = ANC7
' 010110 = ANC6
' 010101 = ANC5
' 010100 = ANC4
' 010011 = ANC3
' 010010 = ANC2
' 010001 = ANC1
' 010000 = ANC0
' 001111 = ANB7
' 001110 = ANB6
' 001101 = ANB5
' 001100 = ANB4
' 001011 = ANB3
' 001010 = ANB2
' 001001 = ANB1
' 001000 = ANB0
' 000111 = ANA7
' 000110 = ANA6
' 000101 = ANA5
' 000100 = ANA4
' 000011 = ANA3
' 000010 = ANA2
' 000001 = ANA1
' 000000 = ANA0
ANSELA = %00000000
ANSELB = %00000000
ANSELC = %00000000
ANSELD = %00000000
ANSELE = %00000001 ' Pin E0 = ADC input
TRISA = %00000000
TRISB = %00000000
TRISC = %10011000
TRISD = %00001100
TRISE = %00001001
DefaultBacklight CON 150
LCD1pin VAR PORTD.2
LCD2pin VAR PORTD.3
LCD3pin VAR PORTC.4
LCD4pin VAR PORTC.5
ADCinput var WORD
HPWMbacklight var BYTE
Pause 200 ' Let PIC and LCD stabilize
ADCinput = 0
HPWMbacklight = 0
HPWM 3,DefaultBacklight,1953
INPUT LCD1pin : INPUT LCD2pin : INPUT LCD3pin : INPUT LCD4pin
LCDOUT $FE, 1 : Pauseus 1
LCDOUT $FE, $80, "ADC test" : Pauseus 1
Mainloop:
adcin 7, ADCinput
HPWMbacklight = (1023 - ADCinput) / 4 ' Inverse, then reduce from 0-1023 to 0-255
HPWM 3,HPWMbacklight,1953
GOTO Mainloop
end
I tried several:
ADCIN 2, ADCinput ' started counting from 0 at E2
ADCIN 3, ADCinput ' started counting from 1 at E2
ADCIN 7, ADCinput ' started counting from 0 at the top
ADCIN 8, ADCinput ' started counting from 1 at the top
Re: How do you chose ADCIN channel in this case
Quote:
I'd like to use E0:
why would it not be 32 like it says ? 0b100000 = ANE0
Re: How do you chose ADCIN channel in this case
Quote:
Originally Posted by
richard
why would it not be 32 like it says ?
Because I'm a potato-head. :D
Re: How do you chose ADCIN channel in this case
Note to the next guy:
You don't need the register if there's only the ADC channel inside it (I keep the list only as documentation for the channel numbers).
Code:
'ADPCH = %00000000 ' ADC POSITIVE CHANNEL SELECTION REGISTER
' bit 7-6 Unimplemented: Read as ‘0’
' bit 5-0 ADPCH<5:0>: ADC Positive Input Channel Selection bits
' 111111 = Fixed Voltage Reference (FVR)
' 111110 = DAC1 output
' 111101 = Temperature Indicator
' 111100 = AVSS (Analog Ground)
' 111011 = Reserved. No channel connected.
' •
' •
' •
' 100010 = ANE2 * 16F18877 only
' 100001 = ANE1 * 16F18877 only
' 100000 = ANE0 * 16F18877 only
' 011111 = AND7 * 16F18877 only
' 011110 = AND6 * 16F18877 only
' 011101 = AND5 * 16F18877 only
' 011100 = AND4 * 16F18877 only
' 011011 = AND3 * 16F18877 only
' 26 ---> 011010 = AND2 * 16F18877 only
' 25 ---> 011001 = AND1 * 16F18877 only
' 011000 = AND0 * 16F18877 only
' 010111 = ANC7
' 010110 = ANC6
' 010101 = ANC5
' 010100 = ANC4
' 010011 = ANC3
' 010010 = ANC2
' 010001 = ANC1
' 010000 = ANC0
' 001111 = ANB7
' 001110 = ANB6
' 001101 = ANB5
' 001100 = ANB4
' 001011 = ANB3
' 001010 = ANB2
' 001001 = ANB1
' 001000 = ANB0
' 000111 = ANA7
' 000110 = ANA6
' 000101 = ANA5
' 000100 = ANA4
' 000011 = ANA3
' 000010 = ANA2
' 000001 = ANA1
' 000000 = ANA0
You only need to declare the channel in the ADCIN command:
Re: How do you chose ADCIN channel in this case
I think this was always the case with the integrated ADCIN command of the PBP.
Then you can always mess with the registers if your are brave enough!
Ioannis
