mssfunqconvert.m

CDMA2000的仿真平台,使用MATLAB设计完成

function [sys,x0,str,ts] = MSSFUNQConvert(t,x,u,flag)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 主要功能：根据输入参数flag的数值调用相应的函数
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
switch flag
    case 0,
        %调用mdlInitializeSizes函数执行初始化
        [sys,x0,str,ts]=mdlInitializeSizes;
    case 2,
        %调用mdlUpdate函数计算离散状态的数值
        sys=mdlUpdate(t,x,u);
    case 3,
        %调用mdlOutputs函数计算输出信号的数值
        sys=mdlOutputs(t,x,u);
    case {1,4,9}
        %没有相应的操作（没有连续状态）
        sys=[];
    otherwise
        error(['Unhandled flag=',num2str(flag)]);
end
%end MS_SFUN_QConvert



%=======================================================================
% mdlInitializeSizes
% Return the sizes, initial conditions, and sample times for the S-function.
%=======================================================================
%
function [sys,x0,str,ts] = mdlInitializeSizes
%调用simsizes获得一个用于存放长度信息的结构
sizes = simsizes;
%设置连续状态的个数
sizes.NumContStates  = 0;
%设置两个离散状态
sizes.NumDiscStates  =2;
%设置输出信号的个数为1
sizes.NumOutputs     =1;
%设置输入信号的个数为1
sizes.NumInputs      = 1;
%设置直接反馈的状态，0表示没有直接反馈，1表示存在直接反馈
sizes.DirFeedthrough = 1;
%设置抽样时间的个数（大于等于1）
sizes.NumSampleTimes = 1;
%通过simsizes把sizes结构返回给sys
sys = simsizes(sizes);

%设置S函数的初始状态x0
x0  = [0 0]';
%设置S函数的保留参数str(应该设置为空向量
str = [];
%初始化抽样时间
ts  = [-1 0]; 

% end mdlInitializeSizes

%
%=======================================================================
% mdlUpdate
% Handle discrete state updates, sample time hits, and major time step
% requirements.
%=======================================================================
%
function sys = mdlUpdate(t,x,u)
%就算S函数的离散状态并且通过sys参数返回给Simulink
if x(1)==0
    x(2)=-1*u;
    x(1)=1;
else
    x(1)=0;
end
sys=x;


%end mdlUpdate

%
%=======================================================================
% mdlOutputs
% Return the output vector for the S-function
%=======================================================================
%
function sys = mdlOutputs(t,x,u)
%就算S函数的输出信号并且通过sys参数返回给Simulink
if x(1)==0
    sys=u;
else
    sys=x(2);
end



%end mdlOutputs