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Global Var

HI!!

I declared 3 global var, i call it inside diferent task and every execution this var should be updates but not to do it.
I have a 8051 under evaluation board.
Maybe can be a problem of my small micro?
What do u think about this?

Thanks

Parents

0 javi pks over 17 years ago in reply to Christoph Franck

OK, well!! I explain the code:

-I have a global var type struct.
-I have 2 task: WRITE task: here create PID task PID task: here call to the funtion that update the those struct.

This is the piece of code:

PID.H

typedef int real;

typedef struct {

real dState;            /* Ultima posicion             */
real iState;            /* Estado del integrador       */
real uMax,uMin;     /* Saturacion del actuador     */
real Kp;                    /* Ganancia proporcional       */
real Ti,Td;                     /* Cte, tiempo integral y derivativo        */
real Ts,Tt;                     /* Periodo muestreo, Cte. tiempo tracking   */
real Kwindup;           /* Cte. antireset windup                    */

} SPid;

real UpdatePID (SPid *pid, real SP, real PV, unsigned int AUTO,real Uman) reentrant{
         into PID.c
         ....
         pid->iState += error;
         return pid->iState;
}

MAIN.C

//global var
SPid iA

void Write (void) _task_ WRITE _priority_ 1{
           .....
           os_create_task(A);
           os_wait(K_SIG, WAIT_FOREVER,0);
           os_clear_signal(WRITE);
}

void PIDa (void) _task_ A _priority_ 1 {
           ...
           Ua = UpdatePID (&iA, SPa, PVa, 1, 4);
           os_send_signal(WRITE);
           os_delete_task(B);
}

the iA var never update

Reply

0 javi pks over 17 years ago in reply to Christoph Franck

OK, well!! I explain the code:

-I have a global var type struct.
-I have 2 task: WRITE task: here create PID task PID task: here call to the funtion that update the those struct.

This is the piece of code:

PID.H

typedef int real;

typedef struct {

real dState;            /* Ultima posicion             */
real iState;            /* Estado del integrador       */
real uMax,uMin;     /* Saturacion del actuador     */
real Kp;                    /* Ganancia proporcional       */
real Ti,Td;                     /* Cte, tiempo integral y derivativo        */
real Ts,Tt;                     /* Periodo muestreo, Cte. tiempo tracking   */
real Kwindup;           /* Cte. antireset windup                    */

} SPid;

real UpdatePID (SPid *pid, real SP, real PV, unsigned int AUTO,real Uman) reentrant{
         into PID.c
         ....
         pid->iState += error;
         return pid->iState;
}

MAIN.C

//global var
SPid iA

void Write (void) _task_ WRITE _priority_ 1{
           .....
           os_create_task(A);
           os_wait(K_SIG, WAIT_FOREVER,0);
           os_clear_signal(WRITE);
}

void PIDa (void) _task_ A _priority_ 1 {
           ...
           Ua = UpdatePID (&iA, SPa, PVa, 1, 4);
           os_send_signal(WRITE);
           os_delete_task(B);
}

the iA var never update

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