Force Simulink Embedded Coder to do a simple cast when converting float to uint16?

13 次查看（过去 30 天）

显示更早的评论

Quentin Coret 2020-3-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513075-force-simulink-embedded-coder-to-do-a-simple-cast-when-converting-float-to-uint16

编辑： Quentin Coret 2020-3-26

I've got a problem with Embedded Coder trying to be too helpful and it's breaking my code.

I want to simply cast a floating point to a uint16 (using the convert block).

Embedded Coder generates this monstruosity:

rtb_DataTypeConversion[0] = (uint16_T)(int32_T)fmod((int32_T)floor(fmax(0.0, fmin(65535.0, PWMGen_TestCode_B.Add_b))), 65536.0);

Which for some reason, when I run on my target (Aurix TC299), just returns 0 all the time (it doesn't like fmod...) I've also tried every option and blocks around, adding saturation, floor etc, it still wants to fmod which breaks my code.

I've hand modified my code to do:

rtb_DataTypeConversion[0] = (uint16_T)(PWMGen_TestCode_B.Add_b);

Which is a simple cast to uint16, and it works! It's as simple as that.

How can I force Simulink/Embedded coder to only generate a simple cast? I don't want to have to hand modify my code everytime, this kind of defeats the point, plus it takes ages...

Thanks for your help.

edit: Solution thanks to Les Backman

2 个评论
显示无隐藏无

Les Beckham 2020-3-26

Maybe the answer to this question will help with your issue:

https://www.mathworks.com/matlabcentral/answers/467960-how-can-i-remove-calls-to-floorf-and-fmodf-in-generated-code?s_tid=answers_rc1-1_p1_Topic

Quentin Coret 2020-3-26

That's it! Oh my god thank you so much. Spent almost two days on this... I looked for it, but it was hidden in the advanced parameters thing.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Birdman 2020-3-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513075-force-simulink-embedded-coder-to-do-a-simple-cast-when-converting-float-to-uint16#answer_422084

在 MATLAB Online 中打开

Why don't you use a MATLAB Function block and write this line inside it? For example:

y=uint16(x);

This line should go inside MATLAB Function instead using Data Type Conversion block.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Birdman 2020-3-26

One question:

-Is the ton/toff ratio smaller than 1? If it so, for example, if it is 0.6, then it might be rounded to 0, which is what you are seeing. Can you also share the mask for Data Type Conversion block?

Quentin Coret 2020-3-26

I've checked with my debugger, the tOn/tOff times are all calculated correctly, they are in number of GTM counts (internal CPU timer, so they'll always be greater than 1).

Example with my modified code that works: On the right side watch window are the result of the math calculation. On the left side are the results of the data conversion.

When I let Embedded Coder do it's thing, the table rtb_DataTypeConversion is all zeroes.

Here is the data convert mask (I've tried pretty much all the different options, it still does the same).

请先登录，再进行评论。

请先登录，再回答此问题。

类别

Code Generation Embedded Coder Deployment, Integration, and Supported Hardware

在 Help Center 和 File Exchange 中查找有关 Deployment, Integration, and Supported Hardware 的更多信息

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