The SPI sending data of the S32K344 is abnormal

[shunyizhang]

The green is MOSI and the purple is SCK

SPI：lpSPI5

SCK：PTD14

MOSI：PTE9

MISO：PTD13

CS：PTD17

I periodically sent a 0x5a data, see the oscilloscope image, found that the MOSI pin first pull up two bits of time before the correct data transmission, why? In order to find the problem, I removed the SPI peripheral device, and the abnormal waveform still exists (even removed the SCK/MOSI pull-up resistance), so the problem is most likely in the MCU itself.

 SPI init:

    /* Configure pins */

     Siul2_Port_Ip_Init(NUM_OF_CONFIGURED_PINS0, g_pin_mux_InitConfigArr0);

//初始化SPI5

Lpspi_Ip_Init(&Lpspi_Ip_PhyUnitConfig_SpiPhyUnit_5_Instance_5);

    /* Update Transfer Mode */

    Lpspi_Ip_UpdateTransferMode(spiNum, LPSPI_IP_POLLING);

send data:

Lpspi_Ip_SyncTransmit(&Lpspi_Ip_DeviceAttributes_SpiExternalDevice_5_Instance_5, &data, &RxBuffer[eSPI5], 1, 10000);

[Senlent]

Hi@shunyizhang

please double check your setting

MOSI：PTE9

MISO：PTD13

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below is my test process , i don't see any problem

[shunyizhang]

Comparing my pictures, it seems that your pictures and mine also have raised parts, I am not sure if this part is normal.

[Senlent · Accepted solution]

Hi@shunyizhang

I will confirm with my AE colleagues whether the tASC parameter can be changed (of course I think you can control the state of the MISO pin yourself after the transmission is completed), and I don’t think this will affect your SPI communication.

[shunyizhang]

Ok,thanks！