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CC3100MODBOOST: Unexpected sync byte from CC3100

Part Number: CC3100MODBOOST
Other Parts Discussed in Thread: CC3100


I am porting SimpleLink driver to STM32 MCU. I ported the host driver before but I haven't seen this. Can anyone please help with understanding the response from the WiFi module.

When connected to MSP development kit, the start sequence looks like this:

SPI Write 4: 65 87 78 56
SPI Read 4: bc dc cd ab

When running on our MCU, the first byte of the response is b9 instead of bc. I manually decoded the scope trace and verified that CC3100 is really sending 0xb9.

SPI Write 4: 65 87 78 56
SPI Read 4: b9 ....

Can anyone tell me what is causing this?