Model-Based Design Toolbox (MBDT)のトピックRe: Multi-turn ABS encoder

Multi-turn ABS encoder

hayaoki7 — Wed, 31 Jan 2018 22:54:13 GMT

Can I use a S32K Model-Based Design Toolbox for S32K1xx Automotive MCU v3.0.0 to control servo motors with multi-turn ABS encoders?

Re: Multi-turn ABS encoder

Daniel_Popa — Thu, 01 Feb 2018 12:35:58 GMT

Hi hayaoki7‌,

Yes, you can. The only think that you need to handle by yourself is the Encoder signal read-outs. For that Model-Based Design Toolbox provides 2 options:

use General Purpose Inputs block to read the encoder signal and generate interrupts each time the A/B/Z signals are changing. Based on that you will increment/decrement the counter

or:

implement your our C-code to handle the encoder read-outs and use the specialized Simulink block to call that C-function in the Simulink Model.

Hope this helps!

Daniel

Re: Multi-turn ABS encoder

hayaoki7 — Thu, 01 Feb 2018 23:08:10 GMT

thank you for your answer.

I'm sorry I still have a lack of study.
Please let me ask you a little more.

To correspond to Biss C or T-format of communication specification of ABS encoder
To make it possible by custom code, which peripheral should I use with it?
Do you have references or documents that will be helpful when creating the custom code

I think that ABS encoder is necessary for robot and linear guide.

Next to sensorless, I think that you want encoder control plus.

Thank you

Re: Multi-turn ABS encoder

Daniel_Popa — Fri, 02 Feb 2018 11:44:27 GMT

Hi hayaoki7‌,

The S32K microprocessor has a dedicated peripheral that can be used to implement any kind of protocol. The peripheral is called FlexIO.

The FlexIO is a highly configurable module providing a wide range of functionality including:

Emulation of a variety of serial communication protocols
Flexible 16-bit timers with support for a variety of trigger, reset, enable and disable conditions

For documentation you can check the https://www.nxp.com/docs/en/reference-manual/S32K-RM.pdf chapter 51

The NXP Model Based Design Toolbox for S32K1xx implements I2C/SPI and UART protocols over FlexIO by calling dedicated drivers from SDK.

In your case, since your encoder support a slightly different communication protocol you will have to configure the FlexIO peripheral in a slightly different manner.

For that you will need too implement standard Simulink S-Function Builder block or to use the Simulink Coder to call your custom code. You can check this as a starting point: https://community.nxp.com/thread/449904#comment-901737 on how to call your own C-code from Simulink models.

In general for custom code you should consult the MATLAB documentation since it is a standard feature.

Hope this helps!

Daniel

Re: Multi-turn ABS encoder

hayaoki7 — Tue, 06 Feb 2018 12:32:17 GMT

Dear Sirs,

First, read the S32K-RM and check it.
Then, refer to the block of SPI or I 2 C, and confirm whether it is somehow.

After the sensorless lecture is over, the encoder servo control
Are there any lecture plans?

I'm looking forward to it.

Best regards