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MSP430FR5962: SPI

Part Number: MSP430FR5962

Hi Forum

I have some questions regarding the SPI

I have an application where we run a SPI at 8Mhz, MCLK is 16Mhz. Compiler is CCS.

Now I want to send data and receive back to back to back, but it seems to be a problem. I have no interrupts running.

I have the following code:

while( pu8TxData != pu8End )
  if( ( *pu16Stat & UCTXIFG ) > 0U )
    *pu16TxData = *pu8TxData++;
  if( ( *pu16Stat & UCRXIFG ) > 0U )
    *pu8RxData++ = (uint8_t)*pu16RxData;

All pointers are setup in advance.

Different compiler uptimizations have a huge effect, and the best is not even the highest setting for speed?

Is it not possible to send and receive data at 8Mhz? Or are there some details I am unaware of?