EV3 BCC / C software problem(s)

[HaWe]

thank you for your reply.
I changed that motor control code, it works as expected!

Code: Select all

// mt-demo.c
// 0.61
// Multitasking-Demo:
// 3 Motoren an die Motorausgänge A,B,C anschließen !
// die Motoren werden automatisch angesteuert,
// die Encoderwerte werden simultan angezeigt!

#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

#include "ev3_constants.h"
#include "ev3_command.h"
#include "ev3_button.h"
#include "ev3_timer.h"
#include "ev3_lcd.h"
#include "ev3_sound.h"
#include "ev3_output.h"

#define clreol  DRAW_OPT_CLEAR_EOL


volatile int flag_threadrun = 0;

//------------------------------------------------------------------------------


void *DisplayValues(void *threadid) {

  while(flag_threadrun) {

    TextOutEx(0, 1, "Enc.A:", clreol); NumOut(42, 1, MotorRotationCount(OUT_A));
    TextOutEx(0, 2, "Enc.B:", clreol); NumOut(42, 2, MotorRotationCount(OUT_B));
    TextOutEx(0, 3, "Enc.C:", clreol); NumOut(42, 3, MotorRotationCount(OUT_C));

    Wait(40);
  }
  pthread_exit(0);
}


//------------------------------------------------------------------------------


inline unsigned long Random(unsigned long x) {
   return (rand() % x);
}


inline void Motor(int outputs, int pwr) {

  SetPower(outputs, pwr);
  On (outputs);

}



void *MotorControl(void *threadid) {
  int speed;

  while(flag_threadrun) {
    speed=Random(201) - 100; // ergibt eine Zufallszahl für die Motorleistung  zwischen -100 und +100
    Motor(OUT_A, speed);

    speed=Random(201) - 100;
    Motor(OUT_B, speed);

    speed=Random(201) - 100;
    Motor(OUT_C, speed);

    Wait( 200+ (Random(2801)) ); // ergibt eine Zufallszahl für die Aktionsdauer von 200 - 3000 ms
  }
  pthread_exit(0);
}


//------------------------------------------------------------------------------


main()  {

  unsigned short btn;


  // initialize
  OutputInit();
  LcdInit();
  ButtonLedInit();
  ResetAllTachoCounts(OUT_ABCD);

  flag_threadrun=1;

  pthread_t f2_thread, f1_thread;

  pthread_create(&f1_thread,NULL,MotorControl,NULL);
  pthread_create(&f2_thread,NULL,DisplayValues,NULL);

  while(1) {
    if (ButtonPressed(btn))  break;
    Wait(100);
  }

  flag_threadrun=0;

  pthread_join(f1_thread,NULL);
  pthread_join(f2_thread,NULL);

  OutputClose();
  OutputExit();
  ButtonLedClose();
  ButtonLedExit();
  LcdExit();

}

About the btn press I already checked the example code but I must admit that I don't understand it.
Can you (or anyone else) provide me with a code snippet which mimics the keypressed() function and which I can use directly in my test code, just returning TRUE if any btn was hit and FALSE instead? In general I would appreciate some pattern like
if ( keypressed() ) {btn=getchar();} // but for btn instead of char or key, so actually more like
if ( btnpressed() ) {btn=getbtn();}

I'll try your LcdText functions as you suggested but help on this issue by completed source code would also be very much appreciated. Otherwise, I also may wait until the implementation of TextOut/NumOut or even printf for a LCD stdout console has been completed.

As TextOut has not been implemented right now: what about using real x,y pixel coordinates instead of x-pixel and y-line-numbers? It would be of more universal or general functionality later on.

[HaWe]

update:
thanks to a little help of a friend multitasking and LcdText work fine now.
(Even meanwhile the button thing is fine now.)