Cannot config SBC by 8-bit per frame in s32k144

[DaoVan]

Hi, I'm currently using "sbc_uja116x_s32k144" example in SDK. When I changed .bitcount from 16 to 8 the SBC driver init will return error and go in to while loop of DEV_ASSERT(), even I changed .isPcsContinuous = true.

As my observation, in the example only send 2 byte per frame. Anyone has any idea for sending 3, 4 bytes per frame. Thank you.

const lpspi_master_config_t lpspiCom1_MasterConfig0 = {
.bitsPerSec = 300000U,
.whichPcs = LPSPI_PCS3,
.pcsPolarity = LPSPI_ACTIVE_LOW,
.isPcsContinuous = false,
.bitcount = 8U, (in the original of SDK is 16U)
.lpspiSrcClk = 8000000U,
.clkPhase = LPSPI_CLOCK_PHASE_2ND_EDGE,
.clkPolarity = LPSPI_SCK_ACTIVE_HIGH,
.lsbFirst = false,
.transferType = LPSPI_USING_INTERRUPTS,
.rxDMAChannel = 255,
.txDMAChannel = 255,
.callback = NULL,
.callbackParam = NULL,
};

Thank and best regards,

Dao Van

[Robin_Shen]

Hi Dao Van,

It seems to be caused by UJA1169, please download https://www.nxp.com/docs/en/data-sheet/UJA1169.pdf:
16-, 24- and 32-bit SPI for configuration, control and diagnosis
During a write operation, the UJA1169 monitors the number of SPI bits transmitted. If the number recorded is not 16, 24 or 32, then the write operation is aborted and an SPI failure event is captured (SPIF = 1)

Best Regards,
Robin
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[DaoVan]

Hi Robin

Actually, we had one project successfully working with s32k118 send 8-bit per frame LPSPI for configuration SBC UJA1169 with following configuration:

static const spiDrv_lpspi_master_config_t masterSBCConfig0 = {

/* Misra: 1.1 Qac: 1053 Cmt: configuration specific */

.BitsPerSec_u32 = 1000000U,

.WhichPcs_en = SPIDRV_PCS0,

.PcsPolarity_en = SPIDRV_ACTIVE_LOW,

/* Misra: 10.3 Qac: 1297 Cmt: configuration specific */

.IsPcsContinuous_b = TRUE,

.Bitcount_u16 = 8U,

.LpspiSrcClk_u32 = 8000000U,

.ClkPhase_en = SPIDRV_CLOCK_PHASE_2ND_EDGE,

.ClkPolarity_en = SPIDRV_PIN_ACTIVE_HIGH,

.BitOrder_en = SPIDRV_TRANSFER_MSB_FIRST,

.TransferType_en = SPIDRV_USING_POLLING,

.RxDMAChannel_u8 = 255,

.TxDMAChannel_u8 = 255,

.Callback_pst = NULL,

.CallbackParam_pst = NULL,

};

With that we can read and write SBC data with 3 and 4 byte like this:

SpiDrv_MasterTransfer(SPI_INST_TYPE_SPI_SBC, TxDataPtr, RxDataPtr, 3);

SpiDrv_MasterTransfer(SPI_INST_TYPE_SPI_SBC, TxDataPtr, RxDataPtr, 4);

1. Do you have any idea for this above point?

2. Regarding the "sbc_uja116x_s32k144" example, we only send 2 bytes per frame correct? if we want to send 3 or 4 bytes we need to config .bitcount = 24 or 32, am I correct?

Thank and best regards,

Dao Van

[Robin_Shen]

Which version of S32K1 SDK are you using? I am using latest S32K1 SDK RTM4.0.3.
S32CT in S32DS v3.4 does not allow to choose 8bit or 24bit or 32bit:

As you can see the driver SBC_DataTransfer use 16bit LSPI. So I am afraid you must select 16 bit LPSPI when using S32K1 SDK.

I did not find SpiDrv_MasterTransfer function.(Do you mean LPSPI_DRV_MasterTransfer?) Have you modified the S32K1 SDK driver or are you using your own driver?

[DaoVan]

Hi Robin,

Which version of S32K1 SDK are you using? I am using latest S32K1 SDK RTM4.0.3.

--> I'm using S32K1xx SDK 3.0.3

S32DS v3.4 does not allow to choose 8bit or 24bit or 32bit:

--> That mean if I refer the SDK example, I will only send 16bit, right?

I did not find SpiDrv_MasterTransfer function.(Do you mean LPSPI_DRV_MasterTransfer?)

--> Yes, correct

Have you modified the S32K1 SDK driver or are you using your own driver?

--> Actually, we are referring the sdk driver with a little bit our changes.

[Robin_Shen · Accepted solution]

If you use SDK APIs and S32 Configuration Tools, you will only use 16bit.

If you write the SPI driver yourself, then according to the UJA1169 DataSheet description, I think 24bit and 32bit are also possible.