I need do float pid calculation and write:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D

//all var are float type, in bank1,,,

int pid(int error, int pv)
{
 output=3D(float)error/pid_devide_value_into_percent;
=20
 =
output_i+=3Dpid_ki*((float)(error+error_0)/((float)2*pid_devide_value_int=
o_percent))*pid_delta_t;=20
 if(output_i>pid_i_max)output_i=3Dpid_i_max;
 if(output_i<pid_i_min)output_i=3Dpid_i_min;
////////////////aaaaaaaaaaaaaaaaaaaaaaaaaa

 =
output_d=3Dpid_kd*(float)(pv-pv_0)/((float)pid_delta_t*pid_devide_value_i=
nto_percent);=20

 error_0=3Derror;pv_0=3Dpv;
 //output_d_0=3Doutput_d;
=20
 =
output=3Dpid_bias*(float)sp/pid_devide_value_into_percent+pid_kp*(output+=
output_i-output_d);

 if(output>100)output=3D100; //over may cause nagtive then 0 run_value
 if(output<0)output=3D0;=20

return output; //////////////////////////bbbbbbbbbbbbbbbbb
}

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D

it works fine in f877a. then I tried to put into f876a, got =
problem,,,//////////////bbbbbbbbbbbb:::always is 100...
then I tried one f874a. all other works, /////bbbbb problem not existing =
any more. but got problem at   //////aaaaaaaaaaaaaaa,
output_i reach 0.3 stop to increas and then decreas, stay at =
0.01........

why is like this?????????? picc v802 pl1` compiled....


_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist