topic Documentation inconsistency or error for MC3377xB Register Write block in MBDT S32K1xx in Model-Based Design Toolbox (MBDT)

Documentation inconsistency or error for MC3377xB Register Write block in MBDT S32K1xx

ranulf — Wed, 25 Nov 2020 00:54:58 GMT

I'm referring to the block at NXP Model-Based Design Toolbox for S32K1xx MCUs/External Devices/Battery Management System/BMS/MC3377xB Register Write

@mariuslucianand The block in Simulink shows a data type mismatch between the constant (uint16) feeding Reg Value the Reg Value port (uint8). See below.

The documentation shows that Reg Value is a UINT16. See below.

Which is in error? I think the block port is in error because register values have 16 bits.

Re: Documentation inconsistency or error for MC3377xB Register Write block in MBDT S32K1xx

mariuslucianand — Wed, 25 Nov 2020 20:15:12 GMT

Hello @ranulf,

You are right, the issue is with the block not with the documentation.

To get the right input value type, please replace the mc3377xb_s32k_reg_write.mexw64 file, from the archive attached to the {Toolbox install path}\external_devices\blocks\mc3377xb.

To find the Toolbox install path, please type the mbd_find_s32k_root command in Matlab.

Hope this helps,

Marius

Re: Documentation inconsistency or error for MC3377xB Register Write block in MBDT S32K1xx

ranulf — Wed, 25 Nov 2020 21:49:59 GMT

Hi @mariuslucianand ,

I followed your instructions and now the block Reg Value port has the correct data type. However, I have not been successful in changing register values. I can read them but not change them. This perhaps is a different question and issue.

Re: Documentation inconsistency or error for MC3377xB Register Write block in MBDT S32K1xx

mariuslucianand — Wed, 25 Nov 2020 22:11:15 GMT

Hello @ranulf ,

I will investigate the behavior that you have mentioned and reply tomorrow. Until then, I remember that I've noticed at some point a reinitialization behavior to the battery cell controller and provided a file called mbdtargetmainlibs32k.tlc that prevents this to happen. I wonder if the block writes the register but due to this reinitialization, the value is set back to reset.

You can find the file that I am talking about here together with instructions. https://community.nxp.com/t5/NXP-Model-Based-Design-Tools/How-to-put-S32K-MCU-into-sleep-low-power-mode/m-p/1165078/highlight/true#M5122

Hope this helps,

Marius

Re: Documentation inconsistency or error for MC3377xB Register Write block in MBDT S32K1xx

ranulf — Wed, 25 Nov 2020 23:17:35 GMT

Hi Marius,

I followed your instructions and have replaced the indicated file. The file replacement appears to have made it possible or me to write register values!! I need to test, but it looks like the blocks related to cell balancing are changing register values. Please do test yourself.