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Undefined symbol

IlgarSky

I cannot compile project where arm_math.h included:

Added"Options for Target" > "C/C++" > "Defines":

                         C/C++ :- ARM_MATH_CM4
                        - __FPU_PRESENT = 1

But cannot compile

Error: L6218E: Undefined symbol arm_pid_init_f32 (referred from main.o).

Parents Reply Children
  • 0 in reply to Andy Neil

    Thank you for answer.
    I`ve added following to main.c and compiled successfully and PID starts to work:

    void arm_pid_init_f32(
  arm_pid_instance_f32 * S,
  int32_t resetStateFlag)
{

  /* Derived coefficient A0 */
  S->A0 = S->Kp + S->Ki + S->Kd;

  /* Derived coefficient A1 */
  S->A1 = (-S->Kp) - ((float32_t) 2.0 * S->Kd);

  /* Derived coefficient A2 */
  S->A2 = S->Kd;

  /* Check whether state needs reset or not */
  if(resetStateFlag)
  {
    /* Clear the state buffer.  The size will be always 3 samples */
    memset(S->state, 0, 3u * sizeof(float32_t));
  }

}