S32K312 SPI+DMA

[sergiverdaguerelausa]

Hi all,

I have an SPI working at 4.8bps using DMA. The issue is that during transmission, gaps of 3.3us appear between bytes:

The SPI clock should work at 80MHz, and the DMA at 160MHz, so I don't understand why this delay appears between bytes.

Configuration:

Code:

/* Initalized clock */
Clock_Ip_Init(&Clock_Ip_aClockConfig[0]);

/* Initalized pin */
Siul2_Port_Ip_Init(NUM_OF_CONFIGURED_PINS0, g_pin_mux_InitConfigArr0);
/* Initialize interrupt */
IntCtrl_Ip_Init(&IntCtrlConfig_0);
IntCtrl_Ip_ConfigIrqRouting(&intRouteConfig);

/* Initialize DMA IP} Driver */
(void)Dma_Ip_Init(&Dma_Ip_xDmaInitPB);

/* Initalized spi using instance lpspi as a spi master */
Lpspi_Ip_Init(&Lpspi_Ip_PhyUnitConfig_SpiPhyUnit_0_Instance_0_BOARD_InitPeripherals);

/* Master transmits data by async method with DMA */
Lpspi_Ip_AsyncTransmit(&MASTER_EXTERNAL_DEVICE, u8_frame_reset, NULL, sizeof(u8_frame_reset), spi_callback);

I am using S32K312EVB-Q17

Thank you in advance!

Sergi

[Robin_Shen · Accepted solution]

Hi Sergi,

Would you please decrease the value of SpiTimeClk2Cs SpiTimeCs2Clk SpiTimeCs2Cs and measure the waveform again?

If still not work, please let me know the version of S32DS\S32K3 RTD, or attached your test project.

Best Regards,
Robin
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[sergiverdaguerelausa]

Hi Robin,

Thank you very much. I attach an screenshot with the new timmings:

And the new configuration:

Now works as I expected.

Bes regards,

Sergi