SOLVED: How can I reduce ADC jitter

**Demon** · - 5th March 2025, 07:52

Originally Posted by richard

...ansel does not override wpu , what you claim makes zero sense ...s

Got that info here, at the bottom:

https://developerhelp.microchip.com/...ly/digital-io/

The pull-up will be disabled automatically when either TRIS is set to an output or the pin is set as an analog input. These changes to TRIS and ANSEL will override WPU settings

Anyways, I'm setting the WPU only for the unused pins now (even analog), playing it safe despite that quote above.

Originally Posted by richard

...your power supply must be very noisy or the pots are complete crap [possibly microphonic] to get such poor results

The TPS56637 seems very stable, especially since I have nothing on that one. The LCD and LED strip are on a separate TPS56637.

What do you mean by microphonic? Are you talking about the taper? Mine are linear, like Bourns B:

Name: Taper.png
Views: 2838
Size: 36.7 KB

Name: Taper.png
Views: 2838
Size: 36.7 KB

**richard** · - 5th March 2025, 11:29

What do you mean by microphonic?

like a microphone in that the slightest vibration causes the resistance to vary

The TPS56637 seems very stable

it might be stable but it can till be noisy , use your scope AC coupled X1 probe on say 5mV range 5mS/div, measure peak to peak noise

**Ioannis** · - 5th March 2025, 18:32

and to be sure, use a resistor divider with cap of 1uF to ground from the tap point to ADC, instead of POT. If your results are stable then you can replace with a pot and see if the problem is the pot itself.

Ioannis

p.s. corrected the drift to jitter on the Thread title

**Demon** · - 16th March 2025, 00:57

Oh I still get jitter at 1023 or ">> 1". I'm running at ">> 2" and had to use Vref- (3R/1K) cause I was having some instability at the 0 end of scale. The pots already have a slight deadzone under 5% and above 95% (look at the chart above - that was from manuf spec sheet).

I only have a resolution of 256, with a maximum of 88 detents because I TX with changes in ADC larger than 2. But I'm still happy because this is good enough for my application (so far).

TX:

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

;--- Interrupts ----------------------------------------------------------------

include "I:\Project_v2\PBP\PBP_Includes\DT_INTS-14_16F1885x-7x.bas"
include "I:\Project_v2\PBP\PBP_Includes\ReEnterPBP.bas"

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    RX_INT,      _RXInterrupt,   PBP,  no
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

DEFINE OSC 32

DEFINE  ADC_BITS 10                 ' 10-bit Analog to digital
DEFINE  ADC_SAMPLEUS 5              ' Set sampling time in uS

DEFINE  HSER_RXREG PORTC
DEFINE  HSER_RXBIT 7
DEFINE  HSER_TXREG PORTC
DEFINE  HSER_TXBIT 6

DEFINE  HSER_RCSTA 90h              ' Enable serial port & continuous receive
DEFINE  HSER_TXSTA 24h              ' Enable transmit, BRGH = 1
Define  HSER_BAUD 115200
DEFINE  HSER_CLROERR 1              ' Clear overflow automatically
DEFINE  HSER_SPBRGH  0
DEFINE  HSER_SPBRG  68

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     0
DEFINE  CCP3_BIT     0
define  CCP4_REG     0
DEFINE  CCP4_BIT     0
define  CCP5_REG     0
DEFINE  CCP5_BIT     0

;--- Setup registers -----------------------------------------------------------

BAUDCON.3 = 1                       ' Enable 16 bit baudrate generator

INTCON = %11000000                  ' INTERRUPT CONTROL REGISTER
'   bit 7   GIE: Global Interrupt Enable bit
'               1 = Enables all active interrupts
'               0 = Disables all interrupts
'   bit 6   PEIE: Peripheral Interrupt Enable bit
'               1 = Enables all active peripheral interrupts
'               0 = Disables all peripheral interrupts

PIE3 = %00100000                    ' PERIPHERAL INTERRUPT ENABLE REGISTER 3
'   bit 5   RCIE: USART Receive Interrupt Enable bit
'               1 = Enables the USART receive interrupt
'               0 = Enables the USART receive interrupt

PIR3 = %00000000                    ' PERIPHERAL INTERRUPT REQUEST REGISTER 3
'   bit 5   RCIF: EUSART Receive Interrupt Flag (read-only) bit (1)
'               1 = The EUSART receive buffer is not empty (contains at least one byte)
'               0 = The EUSART receive buffer is empty

FVRCON = %0000000                  ' FIXED VOLTAGE REFERENCE CONTROL REGISTER
'   bit 7   FVREN: Fixed Voltage Reference Enable bit
'               1 = Fixed Voltage Reference is enabled
'   bit 1-0 ADFVR<1:0>: ADC FVR Buffer Gain Selection bit
'               11 = ADC FVR Buffer Gain is 4x, (4.096V)(2)

ADCON0 = %10000100                  ' ADC CONTROL REGISTER 0
'   bit 7   ADON: ADC Enable bit
'               1 = ADC is enabled
'   bit 2   ADFRM0: ADC results Format/alignment Selection
'               1 = ADRES and ADPREV data are right-justified

ADCON2 = %00000000                  ' ADC CONTROL REGISTER 2
'   bit 2-0 ADMD<2:0>: ADC Operating Mode Selection bits(1)
'               000 = Basic (Legacy) mode

ADCLK = %00001111                   ' ADC CLOCK SELECTION REGISTER
'   bit 5-0 ADCCS<5:0>: ADC Conversion Clock Select bits
'               1111 = FOSC/32

ADREF = %00010000                   ' ADC REFERENCE SELECTION REGISTER
'   bit 4 ADNREF: ADC Negative Voltage Reference Selection bit
'               1 = VREF- is connected to VREF- pin
'               0 = VREF- is connected to AVSS
'   bit 1-0 ADPREF: ADC Positive Voltage Reference Selection bits
'               11 = VREF+ is connected to FVR_buffer 1
'               10 = VREF+ is connected to VREF+ pin
'               00 = VREF+ is connected to VDD
ADPCH = %00000000                   ' ADC POSITIVE CHANNEL SELECTION REGISTER
'               000000 = ANA0


WPUA = %01100000                        ' Pin A7 = ADC-A0 debug
                                        ' Pin A4 = ADC-A4 (B10K)
                                        ' Pin A3 = SW             external pull-down
                                        ' Pin A2 = Vref-
                                        ' Pin A1 = ADC-A1 (B5K w/SW)
                                        ' Pin A0 = ADC-A0 (B5K)
WPUB = %11111111
WPUC = %00100111                        ' Pin C7 = RX
                                        ' Pin C6 = TX
                                        ' Pin C4 = ADC-C4 (B10K)
                                        ' Pin C3 = ADC-C3 (B10K)
                                        

ANSELA = %00010011                      ' Pin A4 = ADC-A4 (B10K)
                                        ' Pin A1 = ADC-A1 (B5K w/SW)
                                        ' Pin A0 = ADC-A0 (B5K)
ANSELB = %00000000
ANSELC = %00011000                      ' Pin C7 = RX
                                        ' Pin C6 = TX
                                        ' Pin C4 = ADC-C4 (B10K)
                                        ' Pin C3 = ADC-C3 (B10K)

TRISA = %00011011                       ' Pin A7 = ADC-A0 debug
                                        ' Pin A4 = ADC-A4 (B10K)
                                        ' Pin A3 = SW
                                        ' Pin A1 = ADC-A1 (B5K w/SW)
                                        ' Pin A0 = ADC-A0 (B5K)
TRISB = %00000000                       ' Pin B7 = ...not available, ICSPDAT
                                        ' Pin B6 = ...not available, ICSPCLK
TRISC = %11011000                       ' Pin C7 = RX      *** Datasheet requirement, INPUT ***
                                        ' Pin C6 = TX      *** Datasheet requirement, INPUT ***
                                        ' Pin C4 = ADC-C4 (B10K)
                                        ' Pin C3 = ADC-C3 (B10K)

A0debug             var LATA.7
SW                  var PORTA.3

MsgData             var byte[3]
MsgCode             VAR BYTE

ADCinput            var WORD
ADCcalc             var WORD
ADCdiff             var WORD
ADCchange           var byte
ShiftRight          var byte

OldADC              var WORD
OldADC_A0           var WORD
OldADC_A1           var WORD
OldADC_A4           var WORD
OldADC_C3           var WORD
OldADC_C4           var WORD
OldSW               var BYTE

RXoccurred          var BYTE

    A0debug = 0

    RXoccurred = 0                              ' Clear RX flag
    
@   INT_ENABLE   RX_INT             ; Enable USART Receive interrupts 

    Pause 1500                           ' Let PIC and LCD stabilize

    goto Start

;--- Interrupts ----------------------------------------------------------------

RXInterrupt:
    hserin [ STR MsgData\3  ]

    while BAUDCON1.6 = 0                        ' Check RCIDL bit
    wend

    RXoccurred = 1                              ' Set flag
@ INT_RETURN
    
;--- Subroutines ---------------------------------------------------------------

SendData:

    hserout [   MsgData[0], MsgData[1], MsgData[2]   ]                             

    while TX1STA.1 = 0                           ' Check TRMT bit
    wend

    while RXoccurred = 0                       ' Check for interrupt
    wend

    RXoccurred = 0                              ' Set flag
    ADCchange = 1
RETURN

ProcessADC:

    ADCchange = 0
    
    if ADCcalc < oldADC then
        ADCdiff = oldADC - ADCcalc
    else
        ADCdiff =  ADCcalc - oldADC
    endif

    IF  ADCdiff > 2 then                                        ' Check for Diff over 2
        MsgData[0] = MsgCode
        if ADCcalc <> oldADC then                               ' ADC value changed
            MsgData[1] = ADCcalc.byte1 : MsgData[2] = ADCcalc.byte0
            GOSUB SendData                             
        endif
    ELSE
        IF  ADCdiff > 0 then                                    ' Check for Diff over 0
            if ADCcalc = 0 then                                 ' Reached end of rotation
                MsgData[1] = ADCcalc.byte1 : MsgData[2] = ADCcalc.byte0
                GOSUB SendData                             
            ELSE
                if ADCcalc = 255 then                           ' Reached end of rotation
                    MsgData[1] = ADCcalc.byte1 : MsgData[2] = ADCcalc.byte0
                    GOSUB SendData                             
                endif
            endif
        endif
    endif
RETURN

Start:

    ADCinput = 0   : ADCdiff = 0 : ADCcalc = 0
    OldADC_A0 = 9999 : OldADC_A1 = 9999 : OldADC_A4 = 9999 : OldADC_C3 = 9999 : OldADC_C4 = 9999
    OldSW = 9
    ShiftRight = 2
    
Mainloop:
    
rem                             ADC A0 test

    MsgCode = 0

    adcin 0, ADCinput
    ADCcalc = ADCinput >> ShiftRight
    
    oldADC = OldADC_A0   
    gosub ProcessADC

    if ADCchange = 1 then
        A0debug = 1
        OldADC_A0 = ADCcalc   
        A0debug = 0
    endif
    
rem                             ADC A1 test

    MsgCode = 1

    adcin 1, ADCinput
    ADCcalc = ADCinput >> ShiftRight

    oldADC = OldADC_A1   
    gosub ProcessADC

    if ADCchange = 1 then
        OldADC_A1 = ADCcalc   
    endif

rem                             SW A3
    
    MsgCode = 3
    if SW <> oldSW then
        oldSW = SW
        MsgData[0] = MsgCode : MsgData[1] = oldSW :MsgData[2] = " "
        GOSUB SendData                             
    endif
    
rem                             ADC A4 test

    MsgCode = 4

    adcin 4, ADCinput
    ADCcalc = ADCinput >> ShiftRight

    oldADC = OldADC_A4   
    gosub ProcessADC

    if ADCchange = 1 then
        OldADC_A4 = ADCcalc   
    endif
    
rem                             ADC C3 test

    MsgCode = 5

    adcin 19, ADCinput
    ADCcalc = ADCinput >> ShiftRight

    oldADC = OldADC_C3   
    gosub ProcessADC

    if ADCchange = 1 then
        OldADC_C3 = ADCcalc   
    endif
    
rem                             ADC C4 test

    MsgCode = 6

    adcin 20, ADCinput
    ADCcalc = ADCinput >> ShiftRight

    oldADC = OldADC_C4   
    gosub ProcessADC

    if ADCchange = 1 then
        OldADC_C4 = ADCcalc   
    endif

  GOTO Mainloop
end

RX:

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

;--- Interrupts ----------------------------------------------------------------

include "I:\Project_v2\PBP\PBP_Includes\DT_INTS-14_16F1885x-7x.bas"
include "I:\Project_v2\PBP\PBP_Includes\ReEnterPBP.bas"

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    RX_INT,      _RXInterrupt,   PBP,  no
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

DEFINE OSC 32
                                      
DEFINE  LCD_DREG      PORTB         ' Set LCD data port
DEFINE  LCD_DBIT      0             ' Set starting data bit
DEFINE  LCD_RSREG     PORTC         ' Set LCD register select port
DEFINE  LCD_RSBIT     4             ' Set LCD register select bit
DEFINE  LCD_EREG      PORTC         ' Set LCD enable port
DEFINE  LCD_EBIT      5             ' 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     PORTB          ' PWM Pulse out to LCD backlight
DEFINE  CCP3_BIT     5
define  CCP4_REG     0              ' Must clear unused CCP pins or else unpredictable results
DEFINE  CCP4_BIT     0
define  CCP5_REG     PORTA          ' PWM Pulse out to LED strips
DEFINE  CCP5_BIT     4

DEFINE  HSER_RXREG PORTC
DEFINE  HSER_RXBIT 7
DEFINE  HSER_TXREG PORTC
DEFINE  HSER_TXBIT 6

DEFINE  HSER_RCSTA 90h              ' Enable serial port & continuous receive
DEFINE  HSER_TXSTA 24h              ' Enable transmit, BRGH = 1
Define  HSER_BAUD 115200
DEFINE  HSER_CLROERR 1              ' Clear overflow automatically
DEFINE  HSER_SPBRGH  0
DEFINE  HSER_SPBRG  68

;--- Setup registers -----------------------------------------------------------

BAUDCON.3 = 1                       ' Enable 16 bit baudrate generator

INTCON = %11000000                  ' INTERRUPT CONTROL REGISTER
'   bit 7   GIE: Global Interrupt Enable bit
'               1 = Enables all active interrupts
'               0 = Disables all interrupts
'   bit 6   PEIE: Peripheral Interrupt Enable bit
'               1 = Enables all active peripheral interrupts
'               0 = Disables all peripheral interrupts

PIE3 = %00100000                    ' PERIPHERAL INTERRUPT ENABLE REGISTER 3
'   bit 5   RCIE: USART Receive Interrupt Enable bit
'               1 = Enables the USART receive interrupt
'               0 = Enables the USART receive interrupt

PIR3 = %00000000                    ' PERIPHERAL INTERRUPT REQUEST REGISTER 3
'   bit 5   RCIF: EUSART Receive Interrupt Flag (read-only) bit (1)
'               1 = The EUSART receive buffer is not empty (contains at least one byte)
'               0 = The EUSART receive buffer is empty

CCP3CON = %10001111                 ' CCP3 CONTROL REGISTER
'   bit 7   EN: CCPx Module Enable bit
'               1 = CCPx is enabled
'   bit 4   FMT: CCPW (Pulse Width) Alignment bit
'       MODE = PWM mode
'               0 = Right-aligned format
'   bit 3-0 MODE<3:0>: CCPx Mode Select bits(1)
'               1111 = PWM mode

CCP5CON = %10001111                 ' CCP5 CONTROL REGISTER
'   bit 7   EN: CCPx Module Enable bit
'               1 = CCPx is enabled
'   bit 4   FMT: CCPW (Pulse Width) Alignment bit
'       MODE = PWM mode
'               0 = Right-aligned format
'   bit 3-0 MODE<3:0>: CCPx Mode Select bits(1)
'               1111 = PWM mode

ADCON0 = %00000000                  ' ADC CONTROL REGISTER 0

WPUA = %11101111                    ' Pin A7 = ADC-A0 debug
WPUB = %11011111
WPUC = %00111111

ANSELA = %00000000
ANSELB = %00000000
ANSELC = %00000000

TRISA = %00000000                       ' Pin A7 = ADC-A0 debug
                                        ' Pin A4 = PWM to LED strips
TRISB = %00000000                       ' Pin B7 = ...not available, ICSPDAT
                                        ' Pin B6 = ...not available, ICSPCLK
                                        ' Pin B5 = PWM to LCD backlight
TRISC = %11000000                       ' Pin C7 = RX      *** Datasheet requirement, INPUT ***
                                        ' Pin C6 = TX      *** Datasheet requirement, INPUT ***

A0debug             var LATA.7

MsgData             var byte[3]
MsgCode             VAR BYTE

MsgADC_A0             VAR WORD
MsgADC_A1             VAR WORD
MsgADC_A4             VAR WORD
MsgADC_C3             VAR WORD
MsgADC_C4             VAR WORD
MsgSW               VAR BYTE
SWtext              VAR BYTE[2]

HPWMlcdBL           var BYTE
HPWMledstripe       var BYTE
DefaultLcdBL        var BYTE
DefaultLedstripe    var BYTE

RXoccurred          var BYTE

    A0debug = 0

    HPWMlcdBL = 255                             ' OFF
    HPWMledstripe = 0                           ' OFF
    HPWM 3, HPWMlcdBL, 1953     
    HPWM 5, HPWMledstripe, 1953 

    RXoccurred = 0                              ' Clear RX flag
    
    Pause 200                           ' Let PIC and LCD stabilize

    goto Start                          ' Jump over sub-routines

;--- Interrupts ----------------------------------------------------------------

RXInterrupt:
    hserin [ STR MsgData\3  ]

'    while BAUDCON1.6 = 0                        ' Check RCIDL bit
'    wend

    RXoccurred = 1                              ' Set flag
@ INT_RETURN

;--- Subroutines ---------------------------------------------------------------

SendConfirmation:
    hserout [   MsgData[0], MsgData[1], MsgData[2]   ]                             

'    while TX1STA.1 = 0                           ' Check TRMT bit
'    wend
RETURN

ProcessADC_A0:
    A0debug = 1
    MsgADC_A0.byte1 = MsgData[1] : MsgADC_A0.byte0 = MsgData[2]

    LCDOUT $FE, $C0+3, DEC4 MsgADC_A0
    
    RXoccurred = 0                              ' Clear RX flag

    HPWMlcdBL = MsgADC_A0
    HPWM 3, HPWMlcdBL, 1953     
    
    MsgData[0] = MsgCode : MsgData[1] = "O" : MsgData[2] = "K"

    gosub SendConfirmation

    LCDOUT $FE, $C0+8, "x" : LCDOUT $FE, $C0+19, " "  
    LCDOUT $FE, $94+8, " " : LCDOUT $FE, $94+19, " "                  
    LCDOUT $FE, $D4+8, " " : LCDOUT $FE, $D4+19, " "       
    A0debug = 0
RETURN

ProcessADC_A1:
    MsgADC_A1.byte1 = MsgData[1] : MsgADC_A1.byte0 = MsgData[2]

    LCDOUT $FE, $94+3, DEC4 MsgADC_A1
    
    RXoccurred = 0                              ' Clear RX flag

    HPWMledstripe = 255 -  MsgADC_A1              ' Invert value
    HPWM 5, HPWMledstripe, 1953 
    
    MsgData[0] = MsgCode : MsgData[1] = "O" : MsgData[2] = "K"

    gosub SendConfirmation

    LCDOUT $FE, $C0+8, " " : LCDOUT $FE, $C0+19, " "  
    LCDOUT $FE, $94+8, "x" : LCDOUT $FE, $94+19, " "                  
    LCDOUT $FE, $D4+8, " " : LCDOUT $FE, $D4+19, " "       
RETURN

ProcessSW3:
    if MsgData[1] = 0 then
        SWtext[0] = "O" : SWtext[1] = "f" : SWtext[2] = "f"
    ELSE
        SWtext[0] = "O" : SWtext[1] = "n" : SWtext[2] = " "
    ENDIF

    LCDOUT $FE, $D4+3, SWtext[0], SWtext[1], SWtext[2], " "
    
    RXoccurred = 0                              ' Clear RX flag
    
    MsgData[0] = MsgCode : MsgData[1] = "O" : MsgData[2] = "K"

    gosub SendConfirmation

    LCDOUT $FE, $C0+8, " " : LCDOUT $FE, $C0+19, " "  
    LCDOUT $FE, $94+8, " " : LCDOUT $FE, $94+19, " "                  
    LCDOUT $FE, $D4+8, "x" : LCDOUT $FE, $D4+19, " "       
RETURN

ProcessADC_A4:
    MsgADC_A4.byte1 = MsgData[1] : MsgADC_A4.byte0 = MsgData[2]
    
    RXoccurred = 0                              ' Clear RX flag

    LCDOUT $FE, $C0+14, DEC4 MsgADC_A4
    
    MsgData[0] = MsgCode : MsgData[1] = "O" : MsgData[2] = "K"

    gosub SendConfirmation

    LCDOUT $FE, $C0+8, " " : LCDOUT $FE, $C0+19, "x"  
    LCDOUT $FE, $94+8, " " : LCDOUT $FE, $94+19, " "                  
    LCDOUT $FE, $D4+8, " " : LCDOUT $FE, $D4+19, " "       
RETURN

ProcessADC_C3:
    MsgADC_C3.byte1 = MsgData[1] : MsgADC_C3.byte0 = MsgData[2]
    
    RXoccurred = 0                              ' Clear RX flag

    LCDOUT $FE, $94+14, DEC4 MsgADC_C3
    
    MsgData[0] = MsgCode : MsgData[1] = "O" : MsgData[2] = "K"

    gosub SendConfirmation

    LCDOUT $FE, $C0+8, " " : LCDOUT $FE, $C0+19, " "  
    LCDOUT $FE, $94+8, " " : LCDOUT $FE, $94+19, "x"                  
    LCDOUT $FE, $D4+8, " " : LCDOUT $FE, $D4+19, " "       
RETURN 

ProcessADC_C4:
    MsgADC_C4.byte1 = MsgData[1] : MsgADC_C4.byte0 = MsgData[2]
    
    RXoccurred = 0                              ' Clear RX flag

    LCDOUT $FE, $D4+14, DEC4 MsgADC_C4
    
    MsgData[0] = MsgCode : MsgData[1] = "O" : MsgData[2] = "K"

    gosub SendConfirmation

    LCDOUT $FE, $C0+9, " " : LCDOUT $FE, $C0+19, " "  
    LCDOUT $FE, $94+9, " " : LCDOUT $FE, $94+19, " "                  
    LCDOUT $FE, $D4+9, " " : LCDOUT $FE, $D4+19, "x"       
RETURN

Start:
    HPWMlcdBL = 150
    HPWMledstripe = 150

    MsgADC_A0 = 0
    MsgADC_A1 = 0
    MsgADC_A4 = 0
    MsgADC_C3 = 0
    MsgADC_C4 = 0
    MsgSW = 0

    HPWM 3, HPWMlcdBL, 1953     
    HPWM 5, HPWMledstripe, 1953 
    
    LCDOUT $FE, 1
    LCDOUT $FE, $80, "  ADC TEST with SW  "        
    LCDOUT $FE, $C0, "A0:____ _  A4:____ _"  
    LCDOUT $FE, $94, "A1:____ _  C3:____ _"                  
    LCDOUT $FE, $D4, "SW:____ _  C4:____ _"       

@   INT_ENABLE   RX_INT             ; Enable USART Receive interrupts 

Mainloop:

    while RXoccurred = 0                       ' Check for interrupt
    wend

    MsgCode = MsgData[0]
    if  MsgCode = 0 then
        gosub ProcessADC_A0
    else
        if  MsgCode = 1 then
            gosub ProcessADC_A1
        else
            if  MsgCode = 3 then
                gosub ProcessSW3
            else
                if  MsgCode = 4 then
                    gosub ProcessADC_A4
                else
                    if  MsgCode = 5 then
                        gosub ProcessADC_C3
                    else
                        if  MsgCode = 6 then
                            gosub ProcessADC_C4
                        endif
                    endif
                endif
            endif
        endif
    endif

  GOTO Mainloop
end

Thread: SOLVED: How can I reduce ADC jitter

Thread Tools

Search Thread

Display

Hybrid View

Re: SOLVED: How can I reduce ADC drift

Re: SOLVED: How can I reduce ADC drift

Re: SOLVED: How can I reduce ADC drift

Re: SOLVED: How can I reduce ADC jitter

Similar Threads

SOLVED - IOC works on B0 but not B5

GOTO statement causing jitter in output frequency, can be this fixed?

trying to reduce current consumption on a 12HV615

Unwanted output signal jitter

Dmx Solved !!!!!!!

Members who have read this thread : 17

Bookmarks

Bookmarks

Posting Permissions