S32K1 RTD function Lpspi_Ip_SyncTransmitHalfDuplex() clocks too many bytes

hns80 — Wed, 27 Apr 2022 20:11:35 GMT

When using the SPI in half duplex mode, the following call sends two bytes, which is expected:

Lpspi_Ip_SyncTransmitHalfDuplex(&Lpspi_Ip_DeviceAttributes_SpiExternalDevice_0_BOARD_InitPeripherals, txBuffer, 2, LPSPI_IP_HALF_DUPLEX_TRANSMIT, timeOut);

When receiving, though, the function clocks multiple bytes. I tried specifying from 1 to 4 bytes and see the peripheral send enough clocks for 6 or 7 bytes:

Lpspi_Ip_SyncTransmitHalfDuplex(&Lpspi_Ip_DeviceAttributes_SpiExternalDevice_0_BOARD_InitPeripherals, rxBuffer, 1, LPSPI_IP_HALF_DUPLEX_RECEIVE, timeOut);

I see the same behavior whether I use interrupt driven SPI or polling.

How can I use the RTD calls to get the peripheral to receive a single byte with no extra clock pulses?

Re: S32K1 RTD function Lpspi_Ip_SyncTransmitHalfDuplex() clocks too many bytes

hns80 — Thu, 28 Apr 2022 02:18:24 GMT

Changing SpiCsContinuous to FALSE fixed the problem

topic S32K1 RTD function Lpspi_Ip_SyncTransmitHalfDuplex() clocks too many bytes in S32 SDK

S32K1 RTD function Lpspi_Ip_SyncTransmitHalfDuplex() clocks too many bytes

Re: S32K1 RTD function Lpspi_Ip_SyncTransmitHalfDuplex() clocks too many bytes