S32K3xx SpiBaudrateConfigRef set

[karmegancjk]

Hi,

Configuration Components for SDK Peripheral Drivers— LPSPI:

1. Lpspi → SpiExternalDevice → SpiUseBaudrateConfig → SpiBaudrateConfigRef? What is the purpose of this setting, and how do you configure it?

2. What is the difference between SpiUseBaudrateConfig and SpiCalculatedBaudRate for SPI baud rate selection?

3. I need a user-friendly way to configure the SPI baud rate. How can I do that?

Regards,

Karmegan C

[Julián_AragónM]

Hi @karmegancjk,

All of the configuration parameters are described inside the respective driver user manual. Under "C:\NXP\S32DS.3.6.1\S32DS\software\PlatformSDK_S32K3\RTD\Spi_TS_T40D34M50I0R0\doc" you can find RTD_SPI_UM.pdf. 

1. SpiBuadrateConfigRef is the reference node used in order to calculate the Spi baud rate.

2. SpiUseBaudrateConfig uses the reference node, SpiCalculatedBaudRate uses the following formula:

SpiCalculatedBaudrate = Function clock / (SpiPrescalerValue * (SpiScaler + 2))

3. You can use the existing example "Spi_Transfer_S32K344" to use as base. Also, chapter 3.6.13 of the previously mentioned file shows how to configure baud rate:

Best regards,
Julián

[karmegancjk]

Hi,

I am not able to assign SpiBaudrateConfig_0 to SpiBaudrateConfigRef in Lpspi Driver.

IDE : S32DS 3.5.13.

RTD : R22_11 V4.0.0.

How do I set the path of SpiBaudrateConfig_0 in SpiBaudrateConfigRef?

[Julián_AragónM]

Hi @karmegancjk,

Apparently, only the MCAL Spi component generates a valid SpiBaudRateConfigRef value. I did not notice this since I was basing the project in MCAL and not IP:

I think this is not intended, so for now, either configure the SPI component without the "UseBaudrateConfig" parameter or with the MCAL component to generate the reference. I will ask internally to see if this is expected behavior.

Best regards,
Julián

[Julián_AragónM]

Hi @karmegancjk

I've confirmed with the internal team, and this is a bug. It is planned to be fixed in the next RTD release.

Best regards,
Juli[an