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RTOS/CC2640: CC2640 as SPI slave received bit shifted data.

Arun Joe
Expert 1780 points
Part Number: CC2640
Other Parts Discussed in Thread: CC2650

Tool/software: TI-RTOS

Hi,

I have a custom board on which the cc2640 acts as SPI slave, the Master is an STM32 Controller working in Mode 1 and clocked at 1.5Mhz.

When I set  frameFormat = SPI_POL0_PHA1; in SPI init function, the data received in cc2650 is bit shifted by one.

For example: if 1 is sent from master, the data received via callback is 2 and the first transfer do not receives any data.

Surprisingly  when frameFormat = SPI_POL1_PHA1 is set in init. The data received is exactly same as what is sent but here also the initial transfer do not show any received data

even-though the interrupt is still occurring. 

Regards,

Joe