GCBASIC / Discussion / Compiler Problems: DAC pic18F56

Boguslaw - 2023-12-20

Hi
I want to generate two different signals on DAC1 and DAC2 , but I have problem, because always I have identical signal on DACs, why ?
For example I have as below, but always I have voltage from DAC1DATL on DAC2 :

DAC2CON = 0b10100000 ' RA2 port DAC1CON = 0b10010000 ' RB7 port do DAC1DATL = 127 DAC2DATL = 50 loop

Thanks
Boguslaw

Last edit: Boguslaw 2023-12-20
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Anobium - 2023-12-20

Welcome,

Not sure you have the chip correct. a 18F56 ?

Without the chip type it is hard to help.

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Boguslaw - 2023-12-20

I have board PIC18F56Q71 Curiosity Nano
and I use: #chip PIC18F56Q71,64

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Anobium - 2023-12-20

Well that is a new chip. And, it may have support issues. When I release support I did write 30 demos but I did not test/try the DAC.

But, looking at PICINFO. I see that DAC1 has two registers DAC1DATH:DAC1DATL and DAC2 as DAC2DAT. So, these two DACs ( of three ) are not the same. What is the diiference?

So, for DAC1 you need to see two registers, and, for DAC2 one registers.

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Boguslaw - 2023-12-20

DAC1DATH=0 and DAC2DATH=0 because I use 8bit values 0-255

DACxDATH: Accesses the upper 2 bits of DACR
DACxDATL: Accesses the lower 8 bits of DACR

Last edit: Boguslaw 2023-12-20

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Anobium - 2023-12-20

DAC1DATL=0 and DAC2DATL=0 surely?

#chip PIC18F56Q71 #option Explicit DAC1DATH=0 DAC2DATH=0

Gives...
"message": "Variable DAC2DATH was not explicitly declared",
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Boguslaw - 2023-12-20

I use SYNWRITE, this compiler not report any error, should I use another compiler?
Probably 8bit DAC use DAC2 DAC3 names (according to datasheet)

Last edit: Boguslaw 2023-12-20

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Anobium - 2023-12-20

I am not sure.
Show me the top line of the ASM file being produced, please.

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;Program compiled by GCBASIC (1.01.00 2023-11-23 (Windows 64 bit) : Build 1308) for Microchip MPASM/MPLAB-X Assembler using FreeBASIC 1.07.1/2023-11-25 CRC29
;Need help? 
;  See the GCBASIC forums at http://sourceforge.net/projects/gcbasic/forums,
;  Check the documentation and Help at http://gcbasic.sourceforge.net/help/,
;or, email us:
;   w_cholmondeley at users dot sourceforge dot net
;   evanvennn at users dot sourceforge dot net
;********************************************************************************
;   Source file    : C:\Temp\Sinusy_tcr8000.gcb
;   Setting file   : D:\GCstudio\GCBASIC\use.ini
;   Preserve mode  : 0
;   Assembler      : GCASM
;   Programmer     : 
;   Output file    : C:\Temp\Sinusy_tcr8000.asm
;********************************************************************************

;Set up the assembler options (Chip type, clock source, other bits and pieces)
 LIST p=18F56Q71, r=DEC
#include <P18F56Q71.inc>
 CONFIG  CP = OFF
 CONFIG  CPD = OFF
 CONFIG  WRTSAF = OFF
 CONFIG  WRTD = OFF
 CONFIG  WRTB = OFF
 CONFIG  WDTE = OFF
 CONFIG  XINST = OFF
 CONFIG  LVP = OFF
 CONFIG  MVECEN = OFF
 CONFIG  MCLRE = INTMCLR
 CONFIG  FCMEN = ON
 CONFIG  CLKOUTEN = OFF
 CONFIG  RSTOSC = HFINTOSC_1MHZ
 CONFIG  FEXTOSC = OFF

;********************************************************************************

;Vectors
    ORG 0
    goto    BASPROGRAMSTART
    ORG 8
    retfie

;********************************************************************************

;Start of program memory page 0
    ORG 12
BASPROGRAMSTART
;Call initialisation routines
    rcall   INITSYS

;Start of the main program
    movlw   160
    movwf   DAC1CON,BANKED
    movlw   144
    movwf   DAC2CON,BANKED
SysDoLoop_S1
    movlw   127
    movwf   DAC1DATL,BANKED
    movlw   50
    movwf   DAC2DATL,BANKED
    bra SysDoLoop_S1
SysDoLoop_E1
BASPROGRAMEND
    sleep
    bra BASPROGRAMEND

;********************************************************************************

INITSYS
    movlb   0
;asm showdebug This code block sets the internal oscillator to ChipMHz
;asm showdebug Default settings for microcontrollers with _OSCCON1_
    movlw   96
    movwf   OSCCON1,BANKED
    clrf    OSCCON3,BANKED
    clrf    OSCEN,BANKED
    clrf    OSCTUNE,BANKED
;asm showdebug The MCU is a chip family ChipFamily
;asm showdebug OSCCON type is 101
    movlw   96
    movwf   OSCCON1,BANKED
    bcf OSCCON1,NDIV3,BANKED
    bcf OSCCON1,NDIV2,BANKED
    bcf OSCCON1,NDIV1,BANKED
    bcf OSCCON1,NDIV0,BANKED
    movlw   8
    movwf   OSCFRQ,BANKED
;asm showdebug _Complete_the_chip_setup_of_BSR_ADCs_ANSEL_and_other_key_setup_registers_or_register_bits
    clrf    TBLPTRU,ACCESS
    banksel ADCON0
    bcf ADCON0,ADFM0,BANKED
    bcf ADCON0,ADON,BANKED
    banksel ANSELA
    clrf    ANSELA,BANKED
    clrf    ANSELB,BANKED
    clrf    ANSELC,BANKED
    clrf    ANSELD,BANKED
    clrf    ANSELE,BANKED
    clrf    ANSELF,BANKED
    banksel CM2CON0
    bcf CM2CON0,C2EN,BANKED
    bcf CM1CON0,C1EN,BANKED
    banksel PORTA
    clrf    PORTA,BANKED
    clrf    PORTB,BANKED
    clrf    PORTC,BANKED
    clrf    PORTD,BANKED
    clrf    PORTE,BANKED
    clrf    PORTF,BANKED
    banksel 0
    return

;********************************************************************************


 END

Last edit: Boguslaw 2023-12-20

Anobium - 2023-12-20

One line...

OK you are on one of the latest builds.

You have #option explicit missing from your program. Add please. You will get the error.

DAC2DATH is being created as a RAM variables. I am not sure what the others are.

DAC2DATH EQU 1280 ; 0x500 SINUS1 EQU 5343 ; 0x14DF SINUS2 EQU 5310 ; 0x14BE X1 EQU 1281 ; 0x501

Try using GCODE as your IDE. It is a lot better and that is where all our development is happening.
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Boguslaw - 2023-12-20

Sorry , I pasted wrong listing ,now is corrected,
Yes now I have error with #option explicit but now I test with 8 bit values

Last edit: Boguslaw 2023-12-20

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Boguslaw - 2023-12-20

I don't know how use GCODE I'm a beginner in GCBasic

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Anobium - 2023-12-20

:-)

So, you are now setting the L registers. My assumption.

So, I think you have to study the datasheet to figure the registers.

But, a thought. You are allowing the chip to go to sleep. Put this at the end of your code. This will prevent sleep.

do loop
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Boguslaw - 2023-12-20

I have below listing with do loop

#chip PIC18F56Q71,64 #option explicit DAC1CON = 0b10100000'0b10100000 '160 RA2 port DAC2CON = 0b10010000'0b10010000 '144 RB7 do DAC1DATL = 127'sinus1(x1) DAC2DATL = 50'sinus2(x1) loop

Last edit: Boguslaw 2023-12-20
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Boguslaw - 2023-12-20

I also tried with DAC2 and DAC3, according to the datasheet for 8bit DAC and it still generates the same voltages on the two DACs.
You could test it on your hardware.

Last edit: Boguslaw 2023-12-20

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Anobium - 2023-12-20

I think that you can only enable one at a time, see page 831.

I may be wrong but this looks like one DAC on multiple selectable outputs.

And, I can tell you are no beginners to microcontrollers. :-)

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Jerry Messina - 2023-12-20

There are 3 DACs on the Q71... DAC1 (10-bit) and DAC2, DAC3 (both 8-bit).

They all share the same 2 output pins (RA2 or RB7), selectable via the OE bits of the DACxCON registers. The datasheet has this note:

This device has multiple DACs that share the same output pin. If more than one DAC is enabled
simultaneously, the priority for the DACOUT pin is DAC1>DAC2...>DACn.

If you want to use all three DACs you could route one of them through one of the OPAMPs to get the output on OPA1OUT (RA1) or OPA2OUT (RB1) instead of enabling its output pin.

👍
2

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Jerry Messina - 2023-12-20

If you're using the Q71 Curiosity Nano you may have a problem using the output on RB7 since that pin is also the builtin debugger/programmer ICSPDAT.

Try routing DAC1 through the OPA instead.

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Jerry Messina - 2023-12-20

quoting myself...

using the output on RB7 since that pin is also the builtin debugger/programmer ICSPDAT.

[RANT]
They do this on a lot of the new chips... mixing the analog functions with the ICSP pins. Since you can't move the analog pins this makes the analog functions unusable while you have the programmer/debugger connected! Why they choose to do this is beyond me.
[/RANT]

@Evan - next time you talk to your contacts @mchip you might ask them why they do this instead of using some of the digital pins for the ICSP connection. At least those you can route with PPS.

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Anobium - 2023-12-20

@Jerry.

I agree! I understand and I will.

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Boguslaw - 2023-12-20

"Try routing DAC1 through the OPA instead." this is hard for implementation for me now.
I'll try to experiment.

Last edit: Boguslaw 2023-12-20

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Jerry Messina - 2023-12-21

Using the 18F56Q71 Curiosity Nano I get the same results as you... can't use RB7 as an output.

You can route DAC1 through OPA1 (output on RA1) using

// OPA1 output RA1 OPA1CON0 = 0xA8 // UNITY GAIN OPA1CON1 = 0x00 OPA1CON2 = 0x04 // DAC1 // DAC1CON (ena, no output pin) DAC1CON = 0x80
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Jerry,

Can the Q71 do that same with the DAC as the LGT?

The program generates a Sine Wave ( works on the LGT).

I have ported this but I am not sure what we would set on the Q71. The LGT used the DALR register. The readtable command sets the DALR.

Are you able to get this working?

Evan

#chip 18F56Q71
#option explicit

// ------ Start of main Program

    Dim DACCounter as Byte

    #define SAMPLES 33
    #define DACPORT PORTA.1

    DIR DACPORT OUT

    // OPA1 output RA1
    OPA1CON0 = 0xA8 // UNITY GAIN
    OPA1CON1 = 0x00
    OPA1CON2 = 0x04 // DAC1

    // DAC1CON (ena, no output pin)
    DAC1CON = 0x80

    Do

            /* Ramp up and down by reading the table data and setting the DAC register
                DAC data register, setting output voltage in DAC mode
                Relationship between DAC output voltage and DALR:
                VDAO = VREF*(DALR + 1)/256
                VDAO indicates DAC output analog voltage
                VREF indicates reference voltagesource, which is set by DAVS of DACON register
            */
            for DACCounter = 1 to 33
                ReadTable SineWaveDAta, DACCounter, DALR
            next

    Loop

    // Sine wave sample DAC setting values
    Table SineWaveData
            0x80, 0x98, 0xb0, 0xc6, 0xda, 0xea, 0xf5, 0xfd, 0xff 
            0xfd, 0xf5, 0xea, 0xda, 0xc6, 0xb0, 0x98, 0x80, 0x67 
            0x4f, 0x39, 0x25, 0x15, 0x0a, 0x02, 0x00, 0x02, 0x0a 
            0x15, 0x25, 0x39, 0x4f, 0x67, 0x80
        End Table

Jerry Messina - 2023-12-21

Evan,
I'll check that out when I get a chance... sort of busy at the moment.

I take back come of what I said in my previous post. While I can route DAC1 out the OPA1OUT, there's still some sort of funny interaction between the DACs... I can't get more than 1 DAC working at a time.

I don't know if it has to do with using the 18F56Q71 Curiosity Nano and its builtin debugger or not.
I have some 26Q71 around here somewhere... I'll try the same thing using it standalone and see if it's a debugger limitation or what. Different chip, but that's all I got atm.

Last edit: Jerry Messina 2023-12-21

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- Anobium - 2023-12-21
  
  OK. Understand.
  
  It would be good to get that demo working.
  
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