Model-Based Design Toolbox (MBDT)のトピックRe: SPI Setup Menu

SPI Setup Menu

peaces — Wed, 26 May 2021 08:10:19 GMT

What can we do to change these settings while running a program on the processor from the SPI setting menu shown in the picture?

Re: SPI Setup Menu

davidtosenovjan — Wed, 26 May 2021 10:36:37 GMT

Which environment is the screenshot taken from?

Re: SPI Setup Menu

peaces — Wed, 26 May 2021 11:19:02 GMT

Matlab/Simulink

Re: SPI Setup Menu

mariuslucianand — Wed, 26 May 2021 19:28:34 GMT

Hello @peaces,

MBDT generates code on top of the S32SDK and, as far as I know, they don't provide such a function to change the settings during runtime. However, the settings (CPHA and CPOL) are stored in the LPSPI_TCR register, so you can try modifying the register just before using the SPI transmit block. Basically, you have to read the register, change the CPHA and CPOL bits and then update the register with the new value. You can use the S32K memory blocks.

Hope this helps,

Marius

Re: SPI Setup Menu

peaces — Fri, 04 Jun 2021 06:53:04 GMT

Re: SPI Setup Menu

peaces — Fri, 04 Jun 2021 06:28:54 GMT

Hello @mariuslucianand

As shown in the picture, there is a System Update block in two different subsystem blocks, and although we trigger these subsystem blocks to work sequentially, the settings cannot be updated and remain at the last configured setting.

Re: SPI Setup Menu

Dong_Luo — Tue, 08 Jun 2021 13:29:30 GMT

Hi peaces,

As Marius said, the SPI drivers don't support changing the Clock and Transfer Attributes after initialization for the same SPI instance.

For the same SPI master to communicate with the slave devices with the different SPI configuration sequence, user needs to call DSPI_Deinit() and then call DSPI_MasterInit() to configure the new attributes (CPOL, CPHA) before transferring the other device. This operation may be a bit inefficient, if caring about the performance, it must directly change the registers.

For the device with the same transfer attributes and different SPI PCS, the SPI drivers provide the function of DSPI_UpdateCS. User just calls it before transmitting.

Hope this helps,

Dong

Re: SPI Setup Menu

peaces — Wed, 09 Jun 2021 06:48:01 GMT

@Dong_Luo

Hello there,
We wrote the codes in the attached text document into the System Update block and we did not get any results.

Re: SPI Setup Menu

Dong_Luo — Thu, 10 Jun 2021 13:02:11 GMT

@peaces,

What's the context of the System Update block?

If the code in the System Update block executes sequentially, it should add the function of DSPI_Deinit(2) between the two functions of DSPI_MasterInit.

it is recommended to set two different varables for the second parameter in DSPI_MasterInit, like DSPI_MasterInit(2, &spiMasterState_LSD, &spiConfig_LSD) and DSPI_MasterInit(2, &spiMasterState_MSD, &spiConfig_MSD);

Additionally, per the schematic of RDVCU5775EVM, the value of whichPCS in spiConfig_LSD shall be 3, and the value of whichPCS in spiConfig_MSD shall be 1.

Re: SPI Setup Menu

peaces — Thu, 10 Jun 2021 13:24:00 GMT

@Dong_Luo

The contents of the system update block are shown in the images called system update.

We made our PCS settings according to the datasheet.

Also, can you share an example with us so that we can get faster results?

Re: SPI Setup Menu

Dong_Luo — Fri, 11 Jun 2021 02:37:45 GMT

Are you using the RDVCU5775EVM board? For the board, the SPI_2 PCS connection to MSDI and LSD is as the following screenshot shows.

Whereas I found your configuration of PCS both are 0, which is not reasonable. here is my configuration.

The MSDI and LSD both need complex drivers on top of SPI drivers. For RDVCU5775EVM, we have no MBDT demo but built an SDK-based demo.

https://www.nxp.com/design/designs/mpc5775b-bms-and-vcu-reference-design:RDVCU5775EVM

Re: SPI Setup Menu

Baris — Fri, 11 Jun 2021 10:40:57 GMT

@Dong_Luo

Yes, I am using the RDVCU5775EVM board. The settings made are as in the image, but still, the problem is not solved.

Re: SPI Setup Menu

mariuslucianand — Fri, 11 Jun 2021 10:47:15 GMT

Hello @peaces,

I assume that you are using the RDVCU5775EVM because you are not mentioning anywhere the board used.

For that, I've created the following model which is using custom code to change the mentioned parameters. In this case, you don't need to init and reinint the DSPI instance, just to update the parameters directly in the registers as in the below image. You can adjust the code as the sensors you are using requires.

Now, if you are using the blocking sending, the interrupt priorities must be increased, as I've done in the model using custom code as well.

Hope this helps,

Marius