Hi Patrick.

I have all family reference manuals (also the one you linked) but none of
them has any sample code. If it makes any sense I use MPLABX 2.0 and XC16
1.20/1.21. Another thing, the speed of micro is aproximately 67MIPS:
>
> #define SYS_FREQ        138188000ULL
>
> #define FCY             SYS_FREQ/2
>
> /* CONFIGURATION REGISTER MAP */
>
> _FOSCSEL(FNOSC_FRCPLL & IESO_OFF)
>
> _FOSC(OSCIOFNC_ON & IOL1WAY_OFF & FCKSM_CSECME)
>
> _FWDT(FWDTEN_OFF)
>
> _FPOR(BOREN_ON & FPWRT_PWR128 & ALTI2C1_OFF)
>
> _FICD(ICS_PGD2 & JTAGEN_OFF)    // PGD1 per a entrenadora, PGD2 per a rob=
ot
>
>    // Configura PLL prescaler, PLL postscaler, PLL divisor:

    CLKDIVbits.PLLPRE =3D 0;      /* Pot agafar valors de 0 a 31 (N1=3D2 a =
33)

                                N1 =3D PLLPRE + 2 (0,8MHz - 8MHz)

                                F =3D 7,37 / 2 =3D 3,685 MHz */

    PLLFBD=3D73;                  /* Pot agafar valors de 0 a 511 (M=3D2 a =
513)

                                M =3D PLLDIV + 2 (120MHz - 340MHz)

                                F =3D 3,685 * 76 =3D 269,005 MHz */

    CLKDIVbits.PLLPOST =3D 0;     /* Pot agafar valors 0,1,3 (N2=3D2,4,8)

                                N2 =3D 2 * (PLLPOST + 1) (<140MHz @85=BAC)

                                Fosc =3D 269,005 / 2 =3D 134,502 MHz */


>                                 // Fcy =3D 134,502 / 2 =3D 67,251 MIPS

    CLKDIVbits.DOZEN =3D 0;

    CLKDIVbits.FRCDIV =3D 0;

    __builtin_write_OSCCONH(0b00000001); /* New Oscillator FRC w/ PLL */

    __builtin_write_OSCCONL(0b00000001);   /* Enable Switch */

    while(OSCCONbits.COSC !=3D 0b001); /* Wait for new Oscillator to become
> FRC w/ PLL */

    while(OSCCONbits.LOCK !=3D 1); /* Wait for Pll to Lock */


Another thing I do, previous to configure QEI, is to deactivate all analog
inputs, paralel port and I2C:

> ANSELB =3D 0;
>
>     ANSELC =3D 0;
>
>     ANSELD =3D 0;
>
>     ANSELE =3D 0;
>
>     ANSELG =3D 0;
>
>     I2C1CON =3D 0;
>
>     I2C2CON =3D 0;
>
>     AD1CON1 =3D 0;
>
>     AD2CON1 =3D 0;
>
>     PMCON =3D 0;
>
>     PMAEN =3D 0;
>
>
In last mail, I forgot to copy the function I use to configure QEI and,
yes, QEIEN is set. I copy that function here:
>
> void inicia_QEI_dre(void)
>
> {
>
>     QEI1CONbits.PIMOD =3D 0b000;      // Index no afecta
>
>     QEI1CONbits.IMV =3D 0b00;         // Index no afecta
>
>     QEI1CONbits.INTDIV =3D 0b000;     // pre-scaler 1:1
>
>     QEI1CONbits.CNTPOL =3D 0b0;       // Avan=E7a en positiu
>
>     QEI1CONbits.GATEN =3D 0b0;        // External Gate no afecta
>
>     QEI1CONbits.CCM =3D 0b00;         // Mode Quadratura
>
>     QEI1IOCbits.QCAPEN =3D 0b0;       // Home no afecta
>
>     QEI1IOCbits.FLTREN =3D 0b0;       // Desactiva el filtre digital
>
>     QEI1IOCbits.QFDIV =3D 0b000;      // Divisor filtre entrada 1:1
>
>     QEI1IOCbits.OUTFNC =3D 0b00;      // Desactiva sortida
>
>     QEI1IOCbits.SWPAB =3D 0b0;        // Canals A i B no es canvien
>
>     QEI1IOCbits.HOMPOL =3D 0b0;       // Home no est=E0 invertit
>
>     QEI1IOCbits.IDXPOL =3D 0b0;       // Index no est=E0 invertit
>
>     QEI1IOCbits.QEBPOL =3D 0b0;       // QEB no est=E0 invertit
>
>     QEI1IOCbits.QEAPOL =3D 0b0;       // QEA no est=E0 invertit
>
>     QEI1CONbits.QEIEN =3D 1;          // Activa el QEI
>
>     POS1CNTH =3D 0;                   // Borra comptador
>
>     POS1CNTL =3D 0;                   // Borra comptador
>
>     VEL1CNT =3D 0;                    // Borra el comptador. S'ha de lleg=
ir
>> a 1-4 kHz
>
> }
>
> I do exactly the same with QEI2. (I know actually most of bits are zero,
but I always include all of them for future changes).

Ariel, Patrick, do you see any difference with your codes and my code? I
have a doubt with this registers: QEIxICH, QEIxICL. Are them needed to run
QEI? What are them for exactly?



2014-02-11 9:43 GMT+01:00 Patrick Moody <patrickmoody84@gmail.com>:

> On 11 February 2014 06:55, Vicent Colomar Prats <vicentecolomar@gmail.com
> >wrote:
>
> > Hi Ariel. Do you refer to this?
> >
> >
> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=3Den557367#doc=
umentation
> >
> > In code examples there is no PWM nor QEI section, most of them are for
> ADC
> > or communications.
> >
> > I do it in this way:
> >
> > > /* QEI */
> > >
> > >     TRISDbits.TRISD5 =3D 1;
> > >
> > >     TRISDbits.TRISD4 =3D 1;
> > >
> > >     TRISDbits.TRISD9 =3D 1;
> > >
> > >     TRISDbits.TRISD8 =3D 1;
> > >
> > >
> > >>     /* PWM */
> > >
> > >     TRISEbits.TRISE0 =3D 0;   // RE0 output
> > >
> > >     TRISEbits.TRISE1 =3D 0;   // RE1 output
> > >
> > >     TRISEbits.TRISE2 =3D 0;   // RE2 output
> > >
> > >     TRISEbits.TRISE3 =3D 0;   // RE3 output
> > >
> > >     // Pins remapables:
> > >
> > >     __builtin_write_OSCCONL(OSCCON & ~(1<<6)); // Unlock PPS IOLOCK
> > >> registers
> > >
> > >     RPINR18bits.U1RXR =3D 97; // U1RX -> RP97 (RF1)
> > >
> > >     RPOR7bits.RP96R =3D 1;    // U1TX -> RP96 (RF0)
> > >
> > >     RPINR14bits.QEA1R =3D 69; // RP69
> > >
> > >     RPINR14bits.QEB1R =3D 68; // RP68
> > >
> > >     RPINR16bits.QEA2R =3D 73; // RPI73
> > >
> > >     RPINR16bits.QEB2R =3D 72; // RPI72
> > >
> > >     __builtin_write_OSCCONL(OSCCON | (1<<6));       // Lock PPS IOLOC=
K
> > >> registers
> > >
> > >
> > And then, I read the registers and send them to the serial port:
> >
> > >         signed long ence,encd;
> >
> >         signed long tence, tencd;
> >
> >         ence =3D POS1CNTL;
> >
> > //        ence +=3D (POS1HLD << 16);
> >
> >         encd =3D POS2CNTL;
> >
> > //        encd +=3D (POS2HLD << 16);
> >
> >         tence =3D INT1HLDL;
> >
> > //        tence +=3D (INT1HLDH << 16);
> >
> >         tencd =3D INT2HLDL;
> >
> > //        tencd +=3D (INT2HLDH << 16);
> >
> >         printf("QEesq=3D%ld, Tesq=3D%ld. QEdre=3D%ld, Tdre=3D%ld\n",enc=
e,tence,
> > > encd, tencd);
> >
> >
> >
> > But they four are always 0, never changes.
> >
> > Can you show me your piece of code about QEI?
> >
>
>
> The data-sheet you're probably looking for is in the "reference manual"
> sub-section of the "Documentation and Software" section, near the bottom =
of
> the page, named "dsPIC33E/PIC24E FRM, Quadrature Encoder Interface"
> Not 100% sure about the link, but this might work:
> http://ww1.microchip.com/downloads/en/DeviceDoc/S15.pdf
>
>
> I didn't see any sign of you setting up the QEI module before attempting =
to
> read from it in the code you posted.
> In my code (by no means perfect) among others, you would expect to see a
> line like this one:
> (Assuming you have the appropriate #include line for the PIC at the top o=
f
> your file)
>
> QEI1CONbits.QEIEN =3D 1; //Enable the QEI counter
>
> If you haven't already, you should look at the data-sheet I linked to (or
> find it if the link didn't work), particularly from page 6 onwards, where
> the registers you should be setting up before you use the QEI modules are
> described.
>
> Hope that helps,
>
> Patrick
> --
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