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:
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
Reply With Quote
Re: How do you chose ADCIN channel in this case
Originally Posted by richard
Bookmarks