"duration" function in stateflow using fixed-point datatype for time

4 次查看（过去 30 天）
Renish Ramegowda
Renish Ramegowda 2020-1-24
评论： stozaki 2020-1-30
I created an mpt.parameter for a time variable. Since time is in ms, I assigned data type as fixdt(0,16,0.001,0)
time_s = mpt.Parameter;
time_s.CoderInfo.Alias = 'Ts';
time_s.Description = 'Time in ms';
time_s.DataType = 'fixdt(0,16,0.001,0)';
time_s.Unit = 's';
time_s.Value = 0.5;
Now in one of my stateflow transition between states, I need to use this time variable. i.e: [duration(t > 20) > time_s]
Matlab thowrs error as below:
In fi > non-fi, or non-fi > fi, the non-fi must be a constant. Transition '[durat...time_s]'"duration(t > 20) > time_s"
Component:Stateflow | Category:Coder error
Error while generating code for chart Chart.
ps: I need fixdt(0,16,0.001,0) since I need to generate fixed point code and cannot afford using single or double or any Integer type.
Is there a workaround for this? Thanks in advance

请先登录，再回答此问题。

回答（1 个）

stozaki
stozaki 2020-1-25
编辑：stozaki 2020-1-25
't' is a reserved word of the double data type. Therefore, you cannot set attributes such as data type.
I thought that using the after function was one of the workarounds. I have attached a sample model.
Supported Symbols in Actions
  4 个评论
显示 2更早的评论
Renish Ramegowda
Renish Ramegowda 2020-1-27
Thanks again.
For me, the transition shall happen only after the point, t > 20 is true and then from that point 0.5 sec is completed. Also in between 0.5 sec timer running, if t > 20 condition becomes false, then the time needs to be reset.
for such scenerio, "duration" function was very useful but issue is, it wont accept fixed point data type for time value. For my requirement, all values can only be fixedpoint data type since floting values cannot be accepted in code generation
Question: Why "duration" function dont accept fixed datatype input?
stozaki
stozaki 2020-1-30
Temporal Logic,
When using Event-Based (tick/CLK): Positive integer
When using Absolute-Time (sec/msec): It is just a positive number, that is, a double type.
Control Chart Execution by Using Temporal Logic
So, My model uses Event-Based Temporal Logic. This is a workaround.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Simulink Functions 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by