How to solve the dma mux source problem of dma channel 6-7 in s32k312 mcal rm module

[xiaoyaojun]

I am configuring dma mux source of S32K312 mcal and found that dma mux source can not configure LPSPI3 of channel 6 and channel 7. I checked RM and found that dma mux after channel 6 can not be used.

Q1: Why can't it be used?

Q2: How do I get around this limitation and use it

Please answer my question ,Thank you very much
note: I'm making a little tool, not that security critical

[Robin_Shen]

Hi xiaoyaojun,

If you want to use DMA_MUX_0_LPSPI_3_RX_REQUEST with S32K312, please select DMAMUX_0 channels 0-5 instead of DMA_CHANNEL_6.

Best Regards,
Robin
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[xiaoyaojun]

Thank you for answering me!

my DMAMUX_0 channels 0-5 have been used by LPSPI0 LPSPI1 LPSPI2 (TX RX) . Is there any other solution? I want to use all LPSPI resources 

[Robin_Shen]

LPSPI0-3 belong to DMAMUX0, (for S32K3x4 LPSPI4-5 belong to DMAMUX1).  But there are only 6 DMAMUX_0 channals on S32K312. (DMAMUX_0 channels 0-5). Have you considered configuring some of them in interrupt mode? 

[xiaoyaojun]

Here's my configuration,Please help me. Thank you