S32K312 + MC33771B SPI Speed

[kjy106906]

Hello

I am currently using the S32K312 + MC33771B combination.
SPI Speed is 4Mhz.
It took longer than expected to read the registers of the MC33771, so I checked the waveform.
The interval between frames (5 bytes) and between frames (90us) was too long.
How can I reduce the gap between frames.
I am using the Spi_SyncTransmit function.

Thank you

(Spi_SyncTransmit(MC33771B)  -> Spi_SyncTransmit(MC33771B) without delay )

[guoweisun]

You can refer to below link for MC33771B:

MC33771B | 14-Channel Li-ion Battery Cell Controller IC | NXP Semiconductors

[kjy106906]

I couldn't find the answer to my question in that link.
A specific answer would be appreciated.

[guoweisun]

In that link there is a example code for reference, you can download it and try test again.

[kjy106906]

I think it's no different than my way.
I don't have any difficulties in implementing it, and I'm asking about the time.
I am using S32K312 (RTD) + Microsar OS.
If it's fast in your environment, please share the 2 frame SPI waveform.

[guoweisun]

OK,for your test waveform, could you please explain the test name of these four channels?

[kjy106906]

S32K312 (RTD) + in Microsar OS environment
I want to reduce the delay between frames.

Yellow = SPI Clock
Red = MOSI
BLUE = MISO
Green = CS

Thank u

[guoweisun]

I am not familiar with the  Spi_SyncTransmit function code, but in your test waveform the green line means the CS line should pull low for active the SPI communication. The 90us interval happened on CS high.

[kjy106906]

Yeah, that's why I said I want to reduce the gap between the two frames. (The part where CS is High)
Any other engineers familiar with the Spi_SyncTransmit function?

[guoweisun]

Please submit ticket for this topic ,I discuss with MCU colleague who told this driver is written by them.

They can support to you!

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