Do you have any plans of developing a SIMULINK block for the QEI interface?



Is it possible to develop my own dsPIC (or any other PIC) Simulink block using the Simulink's "S function builder" ?

Hello,



QEI is not planned in a near future. My priority is:

- Make the toolbox compatible with all matlab version

(Chinese, Japanese etc…)

- Make the I2C blockset

- Make the CAN blockset

Then I will look at others peripheral like QEI.



I do not know how to build a block for dsPIC using the Simulink's "S function builder". I do not know if this is possible.

However, you could use the ‘Custom C function’ of the dsPIC toolbox to build easily your own Simulink block generating C code for dsPIC. Do you need an example on how using this block ?

Note that this block is not available in the evaluation version of the toolbox.



For information, I am planning to release version of the toolbox supporting only one microcontroller. This version will be cheaper, allowing hobbyists and students to get a complete version for the microcontroller they are using.

If you are looking on how to implement the QEI module and have a registered version (that includes the C function call) take a look at this example of how to implement the QEI with the C Function Call block



Hope you find this helpful.



Mariano

Hello Lubin...

I need some help with this model. I tried to read the QEI module using Mariano example and it worked fine. Thanks a lot Mariano! However, I tried to use your sample model with a slight modification in order to read the counts of the QEI unsuccesfully. Coul you advise me if I am doing something wrong? Here is the model and the C code (same as yours) . I am still learning the dsPIC and the way to use the C function block. I am having a lot of questions that I´ll ask soon... But so far so good. Thanks a lot!



Jose Luis

Well, I should have posted this sooner, but this is the code modification for 2 encoders, on dsPIC33fj128mc804

<i>
</i>#include <p33FJ128MC804.h>

void QEIInit(void){


 //QEI configuration register 
  POS1CNT = 0;               // Set Current Position 
  MAX1CNT = 0;              // Use QEI in 2x mode

  POS2CNT = 0;               // Set Current Position
  MAX2CNT = 0;              // Use QEI in 2x mode

  DFLT1CON = 0b0000000100000000;        // Digital filter set to off, Count Error Interrupt Disable
  DFLT2CON = 0b0000000100000000;        // Digital filter set to off, Count Error Interrupt Disable

  QEI1CONbits.QEIM = 7;           // x4 reset by MAXCNT pulse
  QEI1CONbits.POSRES = 0;         // doesn't Allow Index pulse to reset counter
  QEI1CONbits.SWPAB = 1;          // direction 

  QEI2CONbits.QEIM = 7;           // x4 reset by MAXCNT pulse
  QEI2CONbits.POSRES = 0;         // doesn't Allow Index pulse to reset counter
  QEI2CONbits.SWPAB = 1;          // direction 

  //ConfigIntQEI 
    IEC3bits.QEI1IE = 1;                // Enable QEI interrupt
    IPC14bits.QEI1IP = 2;               // Interrupt priority level 2

    IEC4bits.QEI2IE = 1;                // Enable QEI interrupt
    IPC18bits.QEI2IP = 2;               // Interrupt priority level 2
   // extern volatile int ct_turns;
   // ct_turns = 0x8000;

}



/*------------------------------------------------------------------*/
void __attribute__((__interrupt__)) _QEI1Interrupt(void)
{
   extern volatile int ct_turnsE1;
   // if it overflowed
     if (QEI1CONbits.UPDN ==  1){
       ct_turnsE1++;
     } else {
       ct_turnsE1--;
     }
     IFS3bits.QEI1IF = 0;    // clear the interrupt flag
}

void __attribute__((__interrupt__)) _QEI2Interrupt(void)
{
   extern volatile int ct_turnsE2;
   // if it overflowed
     if (QEI2CONbits.UPDN ==  1){
       ct_turnsE2++;
     } else {
       ct_turnsE2--;
     }
     IFS4bits.QEI2IF = 0;    // clear the interrupt flag
}